XRT83L30

XRT83L30
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
JUNE 2006
REV. 1.0.1
GENERAL DESCRIPTION
The XRT83L30 is a fully integrated single-channel
long-haul and short-haul line interface unit for
T1(1.544Mbps) 100Ω, E1(2.048Mbps) 75Ω or 120Ω
and J1 110Ω applications.
In long-haul applications the XRT83L30 accepts
signals that have passed through cables from 0 feet
to over 6000 feet in length and have been attenuated
by 0 to 45dB at 772kHz in T1 mode or 0 to 43dB at
1024kHz in E1 mode. In T1 applications, the
XRT83L30 can generate five transmit pulse shapes
to meet the short-haul Digital Cross-Connect (DSX-1)
template requirements as well as for Channel Service
Units (CSU) Line Build Out (LBO) filters of 0dB,
-7.5dB, -15dB and -22.5dB as required by FCC rules.
It also provides programmable transmit pulse
generator that can be used for arbitrary output pulse
shaping allowing performance improvement over a
wide variety of conditions.
The XRT83L30 provides both Serial Host
microprocessor interface and Hardware Mode for
programming and control. Both B8ZS and HDB3
encoding and decoding functions are included and
can be disabled as required. On-chip crystal-less jitter
attenuator with a 32 or 64 bit FIFO can be placed
either in the receive or the transmit path with loop
bandwidths of less than 3Hz. The XRT83L30
provides a variety of loop-back and diagnostic
features as well as transmit driver short circuit
detection and receive loss of signal monitoring. It
supports internal impedance matching for 75Ω, 100Ω,
110Ω and 120Ω for both transmitter and receiver. For
the receiver this is accomplished by internal resistors
or through the combination of one single fixed value
external resistor and programmable internal resistors.
In the absence of the power supply, the transmit
output and receive input are tri-stated allowing for
redundancy applications. The chip includes an
integrated programmable clock multiplier that can
synthesize T1 or E1 master clocks from a variety of
external clock sources.
APPLICATIONS
• T1 Digital Cross-Connects (DSX-1)
• ISDN Primary Rate Interface
• CSU/DSU E1/T1/J1 Interface
• T1/E1/J1 LAN/WAN Routers
• Public switching Systems and PBX Interfaces
• T1/E1/J1 Multiplexer and Channel Banks
FEATURES
(See Page 2)
FIGURE 1. BLOCK DIAGRAM OF THE XRT83L30 T1/E1/J1 LIU (HOST MODE)
MCLKE1
MCLKT1
TXTEST[0:2]
INSBPV
TPOS / TDATA
TNEG / CODES
TCLK
MCLKOUT
MASTER CLOCK SYNTHESIZER
TAOS
ENABLE
QRSS
PATTERN
GENERATOR
HDB3/
B8ZS
ENCODER
TX/RX JITTER
ATTENUATOR
DRIVE
MONITOR
TIMING
CONTROL
TX FILTER
& PULSE
SHAPER
DMO
TTIP
LINE
DRIVER
TRING
LBO[3:0]
QRPD
QRSS
DETECTOR
RCLK
RNEG / LCV
RPOS / RDATA
NLCD
REMOTE
LOOPBACK
HDB3/
B8ZS
DECODER
NETWORK
LOOP
DETECTOR
NLCD ENABLE
LOOPBACK
ENABLE
TIMING &
DATA
RECOVERY
TX/RX JITTER
ATTENUATOR
LOS
DETECTOR
TXON
LOCAL
ANALOG
LOOPBACK
DIGITAL
LOOPBACK
JA
SELECT
QRSS ENABLE
AIS
DETECTOR
PEAK
DETECTOR
& SLICER
RTIP
RRING
RX
EQUALIZER
EQUALIZER
CONTROL
RLOS
AISD
TEST
HW/HOST
CS
INT
Serial Interface
ICT
SDO
SCLK
SDI
RESET
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
FIGURE 2. BLOCK DIAGRAM OF THE XRT83L30 T1/E1/J1 LIU (HARDWARE MODE)
MCLKE1
MCLKT1
CLKSEL[2:0]
TXTEST[0:2]
INSBPV
TPOS / TDATA
TNEG / CODES
TCLK
MCLKOUT
MASTER CLOCK SYNTHESIZER
TAOS
ENABLE
QRSS
PATTERN
GENERATOR
HDB3/
B8ZS
ENCODER
TX/RX JITTER
ATTENUATOR
DFM
TIMING
CONTROL
TX FILTER
& PULSE
SHAPER
DRIVE
MONITOR
DMO
TTIP
LINE
DRIVER
TRING
LBO[3:0]
QRPD
QRSS
DETECTOR
RCLK
RNEG / LCV
RPOS / RDATA
NLCD
REMOTE
LOOPBACK
HDB3/
B8ZS
DECODER
NETWORK
LOOP
DETECTOR
NLCD ENABLE
LOCAL
ANALOG
LOOPBACK
DIGITAL
LOOPBACK
JA
SELECT
QRSS ENABLE
TXON
LOOPBACK
ENABLE
TIMING &
DATA
RECOVERY
TX/RX JITTER
ATTENUATOR
LOS
DETECTOR
AIS
DETECTOR
PEAK
DETECTOR
& SLICER
RTIP
RRING
RX
EQUALIZER
LOOP1
LOOP0
EQUALIZER
CONTROL
AISD
RLOS
HW/HOST
GAUGE
JASEL1
JASEL0
RXTSEL
TXTSEL
TERSEL1
TERSEL0
RXRES1
RXRES0
TEST
HARWARE CONTROL
ICT
JABW
TRATIO
SR/DR
EQC[4:0]
TCLKE
RCLKE
RXMUTE
ATAOS
RESET
FEATURES
• Fully integrated single-channel long-haul and short-haul transceiver for E1,T1 or J1 applications.
• Adaptive Receive Equalizer for cable attenuation of up to 45dB for T1 and 43dB for E1.
• Programmable Transmit Pulse Shaper for E1,T1 or J1 short-haul interfaces.
• Five fixed transmit pulse settings for T1 short-haul applications plus a fully programmable waveform
generator for transmit output pulse shaping.
• Programmable Transmit Line Build-Outs (LBO) for T1 long-haul application from 0dB to -22.5dB in three
7.5dB steps.
• Tri-State transmit output and receive input capability for redundancy applications
• Selectable receiver sensitivity from 0 to 36dB or 0 to 45dB cable loss for T1 @772kHz and 0 to 43dB for E1
@1024kHz.
• High receiver interference immunity
• Receive monitor mode handles 0 to 29dB resistive attenuation along with 0 to 6dB of cable attenuation for
both T1 and E1 modes.
• Supports 75Ω and 120Ω (E1), 100Ω (T1) and 110Ω (J1) applications.
• Internal and external impedance matching for 75Ω,100Ω, 110Ω and 120Ω.
• Transmit return loss meets or exceeds ETSI 300 166 standard
• On-chip digital clock recovery circuit for high input jitter tolerance
• Crystal-less digital jitter attenuator with 32-bit or 64-bit FIFO Selectable either in transmit or receive path
• On-chip frequency multiplier generates T1 or E1 Master clocks from variety of external clock sources
• On-chip transmit short-circuit protection and limiting, and driver fail monitor output (DMO)
2
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
• Receive loss of signal (RLOS) output
• On-chip HDB3/B8ZS/AMI encoder/decoder
• QRSS pattern generation and detection for testing and monitoring
• Error and Bipolar Violation Insertion and Detection
• Receiver Line Attenuation Indication Output in 1dB steps
• Network Loop-Code Detection for automatic Loop-Back Activation/Deactivation
• Transmit All Ones (TAOS) and In-Band Network Loop Up and Down code generators
• Supports Analog, Remote, Digital and Dual Loop-Back Modes
• Meets or exceeds T1 and E1 short-haul and long-haul network access specifications in ITU G.703, G.775,
G.736 and G.823; TR-TSY-000499; ANSI T1.403 and T1.408; ETSI 300-166 and AT&T Pub 62411
• Supports both Hardware and serial Microprocessor interface for programming
• Programmable Interrupt
• Low power dissipation
• Logic inputs accept either 3.3V or 5V levels
• Single +3.3V Supply Operation
• 64 pin TQFP package
• -40°C to +85°C Temperature Range
ORDERING INFORMATION
PART NUMBER
PACKAGE
OPERATING TEMPERATURE RANGE
XRT83L30IV
64 Lead TQFP (10 x 10 x 1.4mm)
-40°C to +85°C
3
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
JASEL0
JASEL1
JABW
TXTSEL
RXTSEL
TERSEL1
TERSEL0
RESET
QRPD
AISD
NLCD
DGND
DVDD
INSBPV
NLCDE0
NLCDE1
FIGURE 3. PIN OUT OF THE XRT83L30
XRT83L30
32
31
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29
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27
26
25
24
23
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20
19
18
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
RNEG / LCV
RPOS / RDATA
RAVDD
RTIP
RRING
RAGND
TAGND
TTIP
TAVDD
TRING
DM O
VDDPLL
M CLKE1
M CLKT1
GNDPLL
M CLKOUT
GAUGE
RXMUTE
RXRES1
RXRES0
RCLKE
TXTEST2
TXTEST1
TXTEST0
TCLKE
TXON
ICT
TCLK
TPOS / TDATA
TNEG / CODES
RLOS
RCLK
4
AGND
AVDD
LOOP0
LOOP1
SR / DR
ATAOS
TRATIO
EQC0 / INT
EQC1 / CS
EQC2 / SCLK
EQC3 / SDO
EQC4 / SDI
HW/HOST
CLKSEL0
CLKSEL1
CLKSEL2
REV. 1.0.1
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE OF CONTENTS
GENERAL DESCRIPTION .................................................................................................. 1
APPLICATIONS ..............................................................................................................................................
FEATURES ...................................................................................................................................................
Figure 1. Block Diagram of the XRT83L30 T1/E1/J1 LIU (Host Mode) .................................................
Figure 2. Block Diagram of the XRT83L30 T1/E1/J1 LIU (Hardware Mode) ........................................
FEATURES ...................................................................................................................................................
ORDERING INFORMATION ...............................................................................................................
Figure 3. Pin Out of the XRT83L30 .........................................................................................................
1
1
1
2
2
3
4
TABLE OF CONTENTS ....................................................................................................... I
PIN DESCRIPTIONS BY FUNCTION ................................................................................. 5
SERIAL INTERFACE ....................................................................................................................................... 5
RECEIVER .................................................................................................................................................... 6
TRANSMITTER .............................................................................................................................................. 7
JITTER ATTENUATOR .................................................................................................................................... 9
CLOCK SYNTHESIZER ................................................................................................................................... 9
REDUNDANCY SUPPORT ............................................................................................................................. 11
TERMINATIONS ........................................................................................................................................... 11
CONTROL FUNCTION ................................................................................................................................... 13
ALARM FUNCTION/OTHER ........................................................................................................................... 14
POWER AND GROUND ................................................................................................................................. 16
FUNCTIONAL DESCRIPTION .......................................................................................... 17
MASTER CLOCK GENERATOR .....................................................................................................................
Figure 4. Two Input Clock Source ........................................................................................................
Figure 5. One Input Clock Source ........................................................................................................
TABLE 1: MASTER CLOCK GENERATOR .....................................................................................................
17
17
17
18
RECEIVER ......................................................................................................................... 18
RECEIVER INPUT ........................................................................................................................................
RECEIVE MONITOR MODE ...........................................................................................................................
RECEIVER LOSS OF SIGNAL (RLOS) ...........................................................................................................
Figure 6. Simplified Diagram of -15dB T1/E1 Short Haul Mode and RLOS Condition .....................
Figure 7. Simplified Diagram of -29dB T1/E1 Gain Mode and RLOS Condition ...............................
Figure 8. Simplified Diagram of -36dB T1/E1 Long Haul Mode and RLOS Condition .....................
Figure 9. Simplified Diagram of Extended RLOS mode (E1 Only) .....................................................
RECEIVE HDB3/B8ZS DECODER ...............................................................................................................
RECOVERED CLOCK (RCLK) SAMPLING EDGE ............................................................................................
Figure 10. Receive Clock and Output Data Timing .............................................................................
JITTER ATTENUATOR ..................................................................................................................................
GAPPED CLOCK (JA MUST BE ENABLED IN THE TRANSMIT PATH) ................................................................
TABLE 2: MAXIMUM GAP WIDTH FOR MULTIPLEXER/MAPPER APPLICATIONS ..............................................
ARBITRARY PULSE GENERATOR .................................................................................................................
Figure 11. Arbitrary Pulse Segment Assignment ................................................................................
18
19
19
19
20
20
21
21
21
21
22
22
22
23
23
TRANSMITTER ................................................................................................................. 23
DIGITAL DATA FORMAT ...............................................................................................................................
TRANSMIT CLOCK (TCLK) SAMPLING EDGE ................................................................................................
Figure 12. Transmit Clock and Input Data Timing ..............................................................................
TRANSMIT HDB3/B8ZS ENCODER ..............................................................................................................
TABLE 3: EXAMPLES OF HDB3 ENCODING .................................................................................................
TABLE 4: EXAMPLES OF B8ZS ENCODING .................................................................................................
DRIVER FAILURE MONITOR (DMO) .............................................................................................................
TRANSMIT PULSE SHAPER & LINE BUILD OUT (LBO) CIRCUIT ......................................................................
TABLE 5: RECEIVE EQUALIZER CONTROL AND TRANSMIT LINE BUILD-OUT SETTINGS .................................
23
23
24
24
24
24
24
25
25
TRANSMIT AND RECEIVE TERMINATIONS .................................................................. 27
I
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
RECEIVER ............................................................................................................................................... 27
Internal Receive Termination Mode .................................................................................................................. 27
TABLE 6: RECEIVE TERMINATION CONTROL ................................................................................................
Figure 13. Simplified Diagram for the Internal Receive and Transmit Termination Mode ...............
TABLE 7: RECEIVE TERMINATIONS ..............................................................................................................
Figure 14. Simplified Diagram for T1 in the External Termination Mode (RXTSEL= 0) ....................
Figure 15. Simplified Diagram for E1 in External Termination Mode (RXTSEL= 0) ..........................
TRANSMITTER ........................................................................................................................................
27
27
28
28
29
29
Transmit Termination Mode .............................................................................................................................. 29
TABLE 8: TRANSMIT TERMINATION CONTROL .............................................................................................. 29
TABLE 9: TERMINATION SELECT CONTROL ................................................................................................. 29
External Transmit Termination Mode ............................................................................................................... 29
TABLE 10: TRANSMIT TERMINATION CONTROL ............................................................................................
TABLE 11: TRANSMIT TERMINATIONS ..........................................................................................................
REDUNDANCY APPLICATIONS .............................................................................................................
TYPICAL REDUNDANCY SCHEMES .....................................................................................................
Figure 16. Simplified Block Diagram of the Transmit Section for 1:1 & 1+1 Redundancy ..............
Figure 17. Simplified Block Diagram - Receive Section for 1:1 and 1+1 Redundancy ....................
Figure 18. Simplified Block Diagram - Transmit Section for N+1 Redundancy ................................
Figure 19. Simplified Block Diagram - Receive Section for N+1 Redundancy .................................
PATTERN TRANSMIT AND DETECT FUNCTION ...............................................................................................
TABLE 12: PATTERN TRANSMISSION CONTROL ............................................................................................
TRANSMIT ALL ONES (TAOS) .....................................................................................................................
NETWORK LOOP CODE DETECTION AND TRANSMISSION ...............................................................................
TABLE 13: LOOP-CODE DETECTION CONTROL ............................................................................................
TRANSMIT AND DETECT QUASI-RANDOM SIGNAL SOURCE (TDQRSS) .........................................................
LOOP-BACK MODES ....................................................................................................................................
TABLE 14: LOOP-BACK CONTROL IN HARDWARE MODE ...............................................................................
TABLE 15: LOOP-BACK CONTROL IN HOST MODE ........................................................................................
LOCAL ANALOG LOOP-BACK (ALOOP) ........................................................................................................
Figure 20. Local Analog Loop-back signal flow ..................................................................................
REMOTE LOOP-BACK (RLOOP) ..................................................................................................................
Figure 21. Remote Loop-back mode with jitter attenuator selected in receive path .......................
Figure 22. Remote Loop-back mode with jitter attenuator selected in Transmit path .....................
DIGITAL LOOP-BACK (DLOOP) ...................................................................................................................
Figure 23. Digital Loop-back mode with jitter attenuator selected in Transmit path .......................
DUAL LOOP-BACK ......................................................................................................................................
Figure 24. Signal flow in Dual loop-back mode ...................................................................................
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30
30
31
32
32
33
34
35
35
35
35
36
36
38
38
38
38
38
39
39
39
40
40
40
40
HOST MODE SERIAL INTERFACE OPERATION .......................................................... 41
USING THE MICROPROCESSOR SERIAL INTERFACE ......................................................................................
Figure 25. Microprocessor Serial Interface Data Structure ................................................................
TABLE 16: MICROPROCESSOR REGISTER ADDRESS ....................................................................................
TABLE 17: MICROPROCESSOR REGISTER BIT MAP .....................................................................................
TABLE 18: MICROPROCESSOR REGISTER #0 BIT DESCRIPTION ....................................................................
TABLE 19: MICROPROCESSOR REGISTER #1 BIT DESCRIPTION ....................................................................
TABLE 20: MICROPROCESSOR REGISTER #2 BIT DESCRIPTION ....................................................................
TABLE 21: MICROPROCESSOR REGISTER #3 BIT DESCRIPTION ....................................................................
TABLE 22: MICROPROCESSOR REGISTER #4 BIT DESCRIPTION ....................................................................
TABLE 23: MICROPROCESSOR REGISTER #5 BIT DESCRIPTION ....................................................................
TABLE 24: MICROPROCESSOR REGISTER #6 BIT DESCRIPTION ....................................................................
TABLE 25: MICROPROCESSOR REGISTER #7 BIT DESCRIPTION ....................................................................
TABLE 26: MICROPROCESSOR REGISTER #8 BIT DESCRIPTION ....................................................................
TABLE 27: MICROPROCESSOR REGISTER #9 BIT DESCRIPTION ....................................................................
TABLE 28: MICROPROCESSOR REGISTER #10 BIT DESCRIPTION ..................................................................
TABLE 29: MICROPROCESSOR REGISTER #11 BIT DESCRIPTION ..................................................................
II
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52
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55
56
56
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58
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 30: MICROPROCESSOR REGISTER #12 BIT DESCRIPTION ..................................................................
TABLE 31: MICROPROCESSOR REGISTER #13 BIT DESCRIPTION ..................................................................
TABLE 32: MICROPROCESSOR REGISTER #14 BIT DESCRIPTION ..................................................................
TABLE 33: MICROPROCESSOR REGISTER #15 BIT DESCRIPTION ..................................................................
TABLE 34: MICROPROCESSOR REGISTER #16 BIT DESCRIPTION ..................................................................
TABLE 35: MICROPROCESSOR REGISTER #17 BIT DESCRIPTION ..................................................................
TABLE 36: MICROPROCESSOR REGISTER #18 BIT DESCRIPTION ..................................................................
ELECTRICAL CHARACTERISTICS ..................................................................................................................
TABLE 37: ABSOLUTE MAXIMUM RATINGS .................................................................................................
TABLE 38: DC DIGITAL INPUT AND OUTPUT ELECTRICAL CHARACTERISTICS ..............................................
TABLE 39: XRT83L30 POWER CONSUMPTION ..........................................................................................
TABLE 40: E1 RECEIVER ELECTRICAL CHARACTERISTICS ...........................................................................
TABLE 41: T1 RECEIVER ELECTRICAL CHARACTERISTICS ...........................................................................
TABLE 42: E1 TRANSMIT RETURN LOSS REQUIREMENT ..............................................................................
TABLE 43: E1 TRANSMITTER ELECTRICAL CHARACTERISTICS .....................................................................
TABLE 44: T1 TRANSMITTER ELECTRICAL CHARACTERISTICS .....................................................................
Figure 26. ITU G.703 Pulse Template ...................................................................................................
TABLE 45: TRANSMIT PULSE MASK SPECIFICATION ....................................................................................
Figure 27. DSX-1 Pulse Template (normalized amplitude) .................................................................
TABLE 46: DSX1 INTERFACE ISOLATED PULSE MASK AND CORNER POINTS ...............................................
TABLE 47: AC ELECTRICAL CHARACTERISTICS ..........................................................................................
Figure 28. Transmit Clock and Input Data Timing ..............................................................................
Figure 29. Receive Clock and Output Data Timing .............................................................................
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63
65
65
65
65
66
67
67
68
68
69
69
70
70
71
71
72
PACKAGE DIMENSIONS ................................................................................................. 73
64 LEAD THIN QUAD FLAT PACK ............................................................................................ 73
(10 X 10 X 1.4 MM TQFP) ............................................................................................................. 73
REV. 3.00 ..................................................................................................................................... 73
ORDERING INFORMATION ............................................................................................. 74
TABLE 48. ................................................................................................................................................ 74
REVISION HISTORY ..................................................................................................................................... 74
NOTES .............................................................................................................................................. 75
III
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
PIN DESCRIPTIONS BY FUNCTION
SERIAL INTERFACE
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
HW/HOST
20
I
Mode Control Input
This pin is used for selecting Hardware or Host mode to control the device.
Leave this pin unconnected or tie “High” to select Hardware mode. For Host
mode, this pin must be tied “Low”.
NOTE: Internally pulled “High” with a 50kΩ resistor.
SDI
21
I
EQC4
SDO
Equalizer Control Input 4
Hardware mode, SEE”CONTROL FUNCTION” ON PAGE 13.
22
EQC3
SCLK
23
O
Serial Data Output
In Host mode, this pin is the output “Read” data for the serial interface.
I
Equalizer Control Input 3
Hardware mode, SEE”CONTROL FUNCTION” ON PAGE 13.
I
Serial Interface Clock Input
In Host mode, this clock signal is used to control data “Read” or “Write” operation for the Serial Interface. Maximum clock frequency is 20MHz.
Equalizer Control Input 2
Hardware mode, SEE”CONTROL FUNCTION” ON PAGE 13.
EQC2
CS
24
I
EQC0
Chip Select Input
In Host mode, tie this pin “Low” to enable communication with the device via
the Serial Interface.
Equalizer Control Input 1
Hardware mode, SEE”CONTROL FUNCTION” ON PAGE 13.
EQC1
INT
Serial Data Input
In Host mode, this pin is the data input for the Serial Interface.
25
O
Interrupt Output (active "Low")
In Host mode, this pin goes “Low” to indicate an alarm condition has
occurred within the device. Interrupt generation can be globally disabled by
setting the GIE bit to “0” in the command control register.
I
Equalizer Control Input 0
Hardware mode, SEE”CONTROL FUNCTION” ON PAGE 13.
NOTE: This pin is an open drain output and requires an external 10kΩ pullup resistor.
5
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
RECEIVER
SIGNAL NAME
PIN #
TYPE
RLOS
63
O
Receiver Loss of Signal
This signal is asserted ‘High’ for at least one RCLK cycle to indicate loss of
signal at the receive input.
RCLK
64
O
Receiver Clock Output
RNEG
1
O
Receiver Negative Data Output
In dual-rail mode, this signal is the receiver negative-rail output data.
LCV
RPOS
DESCRIPTION
Line Code Violation Output
In single-rail mode, this signal goes ‘High’ for one RCLK cycle to indicate a
code violation is detected in the received data. If AMI coding is selected,
every bipolar violation received will cause this pin to go “High”.
2
O
Receiver Positive Data Output
In dual-rail mode, this signal is the receive positive-rail output data sent to the
Framer.
Receiver NRZ Data Output
In single-rail mode, this signal is the receive NRZ format output data sent to
the Framer.
RDATA
RTIP
4
I
Receiver Differential Tip Positive Input
Positive differential receive input from the line.
RRING
5
I
Receiver Differential Ring Negative Input
Negative differential receive input from the line.
RXMUTE
50
I
Receive Muting
In Hardware mode, connect this pin ‘High’ to mute RPOS and RNEG outputs
to a “Low” state upon receipt of LOS condition to prevent data chattering.
Connect this pin to ‘Low’ to disable muting function.
NOTE: Internally pulled "Low" with 50kΩ resistor.
RCLKE
53
I
Receive Clock Edge
In Hardware mode, with this pin set to ‘High’ the output receive data is
updated on the falling edge of RCLK. With this pin tied ‘Low’, output data is
updated on the rising edge of RCLK.
NOTE: Internally pulled “Low” with a 50kΩ resistor.
6
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TRANSMITTER
SIGNAL NAME
PIN #
TYPE
TTIP
8
O
Transmitter Tip Output
Positive differential transmit output to the line.
TRING
10
O
Transmitter Ring Output
Negative differential transmit output to the line.
TPOS
61
I
Transmitter Positive Data Input
In dual-rail mode, this signal is the positive-rail input data for the transmitter.
TDATA
DESCRIPTION
Transmitter Data Input
In single-rail mode, this pin is used as the NRZ input data for the transmitter.
NOTE: Internally pulled “Low” with a 50kΩ resistor.
TNEG
62
I
Transmitter Negative NRZ Data Input
In dual-rail mode, this signal is the negative-rail input data for the transmitter.
In single-rail mode, this pin can be left unconnected.
Coding Select
In Hardware mode and with single-rail mode selected, connecting this pin
"Low" enables HDB3 in E1 or B8ZS in T1 encoding and decoding. Connecting this pin "High" selects AMI data format.
CODES
NOTE: Internally pulled “Low” with a 50kΩ resistor.
TCLK
60
I
Transmitter Clock Input
E1 rate at 2.048MHz ± 50ppm
T1 rate at 1.544MHz ± 32ppm
During normal operation, both in Host mode and Hardware mode, TCLK is
used for sampling input data at TPOS/TDATA and TNEG/CODES while
MCLK is used as the timing reference for the transmit pulse shaping circuit.
TCLKE
57
I
Transmit Clock Edge
In Hardware mode, with this pin set to a "High", transmit input data is sampled at the rising edge of TCLK. With this pin tied "Low", input data are sampled at the falling edge of TCLK.
NOTE: Internally pulled “Low” with a 50kΩ resistor.
TXON
58
I
Transmitter Turn On
In Hardware mode, setting this pin "High" turns on the Transmit Section. In
this mode, when TXON = “0”, TTIP and TRING driver outputs will be tristated.
NOTES:
1.
Internally pulled "Low" with a 50kΩ resistor.
2.
In Hardware mode only, the receiver is turned on at power-up.
7
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TRANSMITTER
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
TXTEST2
TXTEST1
TXTEST0
54
55
56
I
Transmit Test Pattern pin 2
Transmit Test Pattern pin 1
Transmit Test Pattern pin 0
TXTEST[2:0] pins are used to generate and transmit test patterns according
to the following table:
TXTEST2 TXTEST1 TXTEST0
Test Pattern
0
0
0
Transmit Data
0
0
1
TAOS
0
1
0
TLUC
0
1
1
TLDC
1
0
0
TDQRSS
1
0
1
TDQRSS & INVQRSS
1
1
0
TDQRSS & INSBER
1
1
1
TDQRSS & INVQRSS & INS
TAOS (Transmit All Ones): Activating this condition enables the transmission of an All Ones Pattern.TCLK must not be tied "Low".
TLUC (Transmit Network Loop-Up Code): Activating this condition
enables the Network Loop-Up Code of "00001" to be transmitted to the line.
When Network Loop-Up code is being transmitted, the XRT83L30 will ignore
the Automatic Loop-Code detection and Remote Loop-back activation
(NLCDE1=”1”, NLCDE0=”1”, if activated) in order to avoid activating Remote
Digital Loop-back automatically when the remote terminal responds to the
Loop-back request.
TLDC (Transmit Network Loop-Down Code): Activating this condition
enables the network Loop-Down Code of "001" to be transmitted to the line.
TDQRSS (Transmit/Detect Quasi-Random Signal): Setting TXTEST2=”1”,
regardless of the state of TXTEST1 and TXTEST0, enables Quasi-Random
Signal Source generation and detection. In a T1 system QRSS pattern is a
220-1 pseudo-random bit sequence (PRBS) with no more than 14 consecutive zeros. In a E1 system, QRSS is a 215-1 PRBS pattern.
When TXTEST2 is “1” and TDQRSS is active, setting TXTEST0 to “1” inverts
the polarity of transmitted QRSS pattern. Resetting to "0" sends the QRSS
pattern with no inversion.
When TXTEST2 is “1” and TDQRSS is active, transitions of TXTEST1 from
"0" to "1" results in a bit error to be inserted in the transmitted QRSS pattern.
The state of this pin is sampled on the rising edge of TCLK. To ensure the
insertion of a bit error, this pin should be reset to a "0" before setting to a "1".
When TXTEST2 is “1”, TXTEST1 and TXTEST0 affect the transmitted QRSS
bit pattern independently.
8
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
JITTER ATTENUATOR
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
JABW
46
I
Jitter Attenuator Bandwidth
In Hardware and E1 mode, when JABW=”0” the jitter attenuator bandwidth
is 10Hz (normal mode). Setting JABW to “1” selects a 1.5Hz Bandwidth for
the Jitter Attenuator and the FIFO length will be automatically set to 64 bits.
In T1 mode the Jitter Attenuator Bandwidth is always set to 3Hz, and the
state of this pin has no effect on the Bandwidth. See table under JASEL1 pin,
below.
NOTE: Internally pulled “Low” with a 50kΩ resistor.
JASEL1
JASEL0
47
48
I
Jitter Attenuator select pin 1
Jitter Attenuator select pin 0
In Hardware mode, JASEL0, JASEL1 and JABW pins are used to place the
jitter attenuator in the transmit path, the receive path or to disable it and set
the jitter attenuator bandwidth and FIFO size per the following table.
JA BW (Hz)
T1
E1
FIFO Size
T1/E1
JABW
JASEL1
JASEL0
JA Path
0
0
0
Disabled
------
------
------
0
0
1
Transmit
3
10
32/32
0
1
0
Receive
3
10
32/32
0
1
1
Receive
3
10
64/64
1
0
0
Disabled
------
------
--------
1
0
1
Transmit
3
1.5
32/64
1
1
0
Receive
3
1.5
32/64
1
1
1
Receive
3
1.5
64/64
NOTE: These pins are internally pulled "Low" with 50kΩ resistors.
CLOCK SYNTHESIZER
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
MCLKE1
13
I
E1 Master Clock Input
This input signal is an independent 2.048MHz clock for E1 system with
required accuracy of better than ±50ppm and a duty cycle of 40% to 60%.
MCLKE1 is used in the E1 mode. Its function is to provide internal timing for
the PLL clock recovery circuit, transmit pulse shaping, jitter attenuator block,
reference clock during transmit all ones data and timing reference for the
microprocessor in Host mode operation.
MCLKE1 is also input to a programmable frequency synthesizer that under
the control of the CLKSEL[2:0] inputs can be used to generate a master
clock from an accurate external source. In systems that have only one master clock source available (E1 or T1), that clock should be connected to both
MCLKE1 and MCLKT1 inputs for proper operation.
NOTES:
1.
See pin descriptions for pins CLKSEL[2:0].
2.
Internally pulled “Low” with a 50kΩ resistor.
9
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
CLOCK SYNTHESIZER
SIGNAL NAME
PIN #
TYPE
MCLKT1
14
I
DESCRIPTION
T1 Master Clock Input
This signal is an independent 1.544MHz clock for T1 systems with required
accuracy of better than ±50ppm and duty cycle of 40% to 60%. MCLKT1
input is used in the T1 mode.
NOTES:
1.
See MCLKE1 description for further explanation for the usage of
this pin.
2.
Internally pulled “Low” with a 50kΩ resistor.
MCLKOUT
16
O
Synthesized Master Clock Output
This signal is the output of the Master Clock Synthesizer PLL which is at T1
or E1 rate based on the mode of operation.
CLKSEL2
CLKSEL1
CLKSEL0
17
18
19
I
Clock Select input for Master Clock Synthesizer pin 2
Clock Select input for Master Clock Synthesizer pin 1
Clock Select input for Master Clock Synthesizer pin 0
In Hardware mode, CLKSEL[2:0] are input signals to a programmable frequency synthesizer that can be used to generate a master clock from an
external accurate clock source according to the following table. The
MCLKRATE control signal is generated from the state of EQC[4:0] inputs.
See Table 5 for description of Transmit Equalizer Control bits.
In Host mode, the state of these pins are ignored and the master frequency
PLL is controlled by the corresponding interface bits.
MCLKE1
(kHz)
MCLKT1
(kHz)
CLKSEL2
CLKSEL1
CLKSEL0
MCLKRATE
CLKOUT
(KHz)
2048
2048
0
0
0
0
2048
2048
2048
0
0
0
1
1544
2048
1544
0
0
0
0
2048
1544
1544
0
0
1
1
1544
1544
1544
0
0
1
0
2048
2048
1544
0
0
1
1
1544
8
X
0
1
0
0
2048
8
X
0
1
0
1
1544
16
X
0
1
1
0
2048
16
X
0
1
1
1
1544
56
X
1
0
0
0
2048
56
X
1
0
0
1
1544
64
X
1
0
1
0
2048
64
X
1
0
1
1
1544
128
X
1
1
0
0
2048
128
X
1
1
0
1
1544
256
X
1
1
1
0
2048
256
X
1
1
1
1
1544
NOTE: Internally pulled "Low" with a 50kΩ resistor.
10
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
REDUNDANCY SUPPORT
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
DMO
11
O
Driver Failure Monitor
This pin transitions "High" if a short circuit condition is detected in the transmit driver, or no transmit output pulse is detected for more than 128 TCLK
cycles.
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
GAUGE
49
I
Twisted Pair Cable Wire Gauge Select
In Hardware mode, connect this pin "High" to select 26 Gauge wire. Connect
this pin “Low” to select 22 and 24 gauge wire.
TERMINATIONS
NOTE: Internally pulled “Low” with a 50kΩ resistor.
TRATIO
26
I
Transmitter Transformer Ratio Select
In external termination mode, setting this pin "High" selects a transformer
ratio of 1:2 for the transmitter. A "Low" on this pin sets the transmitter transformer ratio to 1:2.45. In the internal termination mode the transmitter transformer ratio is permanently set to 1:2 and the state of this pin is ignored.
NOTE: Internally pulled "Low" with a 50kΩ resistor.
RXTSEL
44
I
Receiver Termination Select
In Hardware mode when this pin is “Low” the receive line termination is
determined only by the external resistor. When “High”, the receive termination is realized by internal resistors or the combination of internal and external resistors according to RXRES[1:0]. These conditions are described in the
following table:
RXTSEL
RX Termination
0
External
1
Internal
NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.
TXTSEL
45
I
Transmit Termination Select
In Hardware mode when this pin is “Low” the transmit line termination is
determined only by external resistor. When “High”, the transmit termination is
realized only by an internal resistor. These conditions are summarized in the
following table:
TXTSEL
TX Termination
0
External
1
Internal
NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.
11
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TERMINATIONS
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
TERSEL1
TERSEL0
43
42
I
Termination Impedance Select pin 1
Termination Impedance Select pin 0
In the Hardware mode and in the Internal Termination mode (TXTSEL=”1”
and/or RXTSEL=”1”) TERSEL[1:0] control the transmit and receive termination impedance according to the following table:
TERSEL1
TERSEL0
Termination
0
0
100Ω
0
1
110Ω
1
0
75 Ω
1
1
120Ω
In the Internal Termination mode, the receive termination is realized completely by internal resistors or the combination of internal and one fixed external resistor (see description for RXRES[1:0] pins). In the internal termination
mode the transformer ratio of 1:2 and 2:1 is required for the transmitter and
receiver respectively with the transmitter output AC coupled to the transformer.
NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.
RXRES1
RXRES0
51
52
I
Receive External Resistor Control pin 1
Receive External Resistor Control pin 0
In Hardware mode, RXRES[1:0] pins selects the required value of the external fixed resistor for the receiver according to the following table. This mode
is only available in the internal impedance mode by pulling RXTSEL “High”.
RXRES1
RXRES0
RX Fixed Resistor
0
0
No External Fixed Resistor
0
1
240Ω
1
0
210Ω
1
1
150Ω
NOTE: Internally pulled “Low” with 50kΩ resistor.
12
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
CONTROL FUNCTION
RESET
41
I
Hardware Reset (Active "Low")
When this pin is tied “Low” for more than 10µs, the device is put in the reset
state.
Pulling RESET “Low” while the ICT pin is also “Low” will put the chip in factory test mode. This condition should never happen during normal operation.
NOTE: Internally pulled “High” with a 50kΩ resistor.
SR/DR
28
I
Single-Rail/Dual-Rail Data Format
In Hardware mode, connect this pin "Low" to select transmit and receive
data format in dual-rail mode. In this mode, HDB3 or B8ZS encoder and
decoder are not available.
Connect this pin "High" to select single-rail data format.
NOTE: Internally pulled "Low" with a 50kΩ resistor.
LOOP1
LOOP0
29
30
I
Loop-back Control pin 1
Loop-back Control pin 0
In Hardware mode, LOOP[1:0] pins are used to control the Loop-back functions according to the following table:
LOOP1
LOOP0
MODE
0
0
Normal Mode
0
1
Local Loop-Back
1
0
Remote Loop-Bac
1
1
Digital Loop-Back
NOTE: Internally pulled "Low" with a 50kΩ resistor.
EQC4
21
I
Serial Data Input
Host mode, SEE”SERIAL INTERFACE” ON PAGE 5.
SDI
EQC3
22
I
SDO
O
EQC2
SCLK
Equalizer Control Input pin 4
In Hardware mode, this pin together with EQC[3:0] are used for controlling
the transmit pulse shaping, transmit line build-out (LBO), receive monitoring
and also to select T1, E1 or J1 modes of operation. See Table 5 for description of Transmit Equalizer Control bits.
23
I
Equalizer Control Input pin 3
See EQC4/SDI description for further explanation for the usage of this pin.
Serial Data Output
Host mode, SEE”SERIAL INTERFACE” ON PAGE 5.
Equalizer Control Input pin 2
See EQC4/SDI description for further explanation for the usage of this pin.
Serial Interface Clock Input
Host mode, SEE”SERIAL INTERFACE” ON PAGE 5.
13
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
CONTROL FUNCTION
EQC1
24
I
Equalizer Control Input pin 1
See EQC4/SDI description for further explanation for the usage of this pin.
Chip Select Input
Host mode, SEE”SERIAL INTERFACE” ON PAGE 5.
25
I
Equalizer Control Input pin 0
See EQC4/SDI description for further explanation for the usage of this pin.
Interrupt Output
Host mode, SEE”SERIAL INTERFACE” ON PAGE 5.
CS
EQC0
INT
O
ALARM FUNCTION/OTHER
SIGNAL NAME
PIN #
TYPE
ATAOS
27
I
DESCRIPTION
Automatic Transmit “All Ones” Pattern
In Hardware mode, a "High" level on this pin enables the automatic transmission of an "All Ones" AMI pattern from the transmitter when the receiver
has detected an LOS condition. A "Low" level on this pin disables this function.
NOTE: This pin is internally pulled “Low” with a 50kΩ resistor.
ICT
59
I
In-Circuit Testing (active "Low")
When this pin is tied “Low”, all output pins are forced to a “High” impedance
state for in-circuit testing.
Pulling RESET “Low” while ICT pin is also “Low” will put the chip in factory
test mode. This condition should never happen during normal operation.
NOTE: Internally pulled “High” with a 50kΩ resistor.
14
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
ALARM FUNCTION/OTHER
SIGNAL NAME
PIN #
TYPE
NLCDE1
NLCDE0
33
34
I
DESCRIPTION
Network Loop Code Detection Enable pin 1
Network Loop Code Detection Enable pin 0
NLCDE[1:0] pins are used to control the Loop-Code detection according to
the following table:
NLCDE1
NLCDE0
Function
0
0
Disable Loop-Code
Detection
0
1
Detect Loop-Up Code in
Receive Data
1
0
Detect Loop-Down Code in
Receive Data
1
1
Automatic Loop-Code
Detection
When NLCDE1=”0” and NCLDE0=”1”, or NLCDE1=”1” and NLCDE0=”0”, the
chip is manually programed to monitor the receive data for the Loop-Up or
Loop-Down code respectively. When the presence of the “00001” or “001”
pattern is detected for more than 5 seconds, the NLCD pin is set to “1” and
the host has the option to activate the loop-back function manually.
Setting the NLCDE1=”1” and NLCDE0=”1” enables the Automatic LoopCode detection and Remote-Loop-Back activation mode. As this mode is initiated, the state of the NLCD pin is reset to “0” and the chip is programmed to
monitor the receive data for the Loop-Up Code. If the “00001” pattern is
detected for longer than 5 seconds, the NLCD pin is set to “1”, Remote LoopBack is activated and the chip is automatically programed to monitor the
receive data for the Loop-Down code. The NLCD pin stays “High” even after
the chip stops receiving the Loop-Up code. The remote Loop-Back condition
is removed when the chip receives the Loop-Down code for more than 5 seconds or if the Automatic Loop-Code detection mode is terminated.
INSBPV
35
I
Insert Bipolar Violation
When this pin transitions from "0" to "1", a bipolar violation is inserted in the
transmitted data stream. Bipolar violation can be inserted either in the QRSS
pattern, or input data when operating in single-rail mode. The state of this pin
is sampled on the rising edge of TCLK.
NOTE: To ensure the insertion of a bipolar violation, this pin should be reset
to a "0" prior to setting to a "1".
15
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
ALARM FUNCTION/OTHER
SIGNAL NAME
PIN #
TYPE
DESCRIPTION
NLCD
38
O
Network Loop-Code Detection Output pin
This pin operates differently in the Manual or the Automatic Network LoopCode detection modes.
In the Manual Loop-Code detection mode (NLCDE1 =”0” and NLCDE0 =”1”,
or NLCDE1 =”1” and NLCDE0 =”0”) this pin gets set to “1” as soon as the
Loop-Up (“00001”) or Loop-Down (“001”) code is detected in the receive data
for longer than 5 seconds. The NLCD pin stays in the “1” state for as long as
the chip detects the presence of the Loop-Code in the receive data and it is
reset to “0” as soon as it stops receiving it.
When the Automatic Loop-Code detection mode (NLCDE1 =”1” and
NLCDE0 =”1”) is initiated, the NLCD output pin is reset to “0” and the chip is
programmed to monitor the receive input data for the Loop-Up Code. The
NLCD pin is set to a “1” to indicate that the Network Loop Code is detected
for more than 5 seconds. Simultaneously the Remote Loop-Back condition is
automatically activated and the chip is programmed to monitor the receive
data for the Network Loop-Down Code. The NLCD pin stays in the “1” state
for as long as the Remote Loop-Back condition is in effect even if the chip
stops receiving the Loop-Up Code. Remote Loop-Back is removed if the chip
detects the “001” pattern for longer than 5 seconds in the receive data.
Detecting the “001” pattern also results in resetting the NLCD output pin.
AISD
39
O
Alarm Indication Signal Detect Output pin
This pin is set to "1" to indicate that an All Ones Signal is detected by the
receiver. The value of this pin is based on the current status of Alarm Indication Signal detector.
QRPD
40
O
Quasi-random Pattern Detection Output pin
This pin is set to "1" to indicate that the receiver is currently in synchronization with the QRSS pattern. The value of this pin is based on the current status of Quasi-random pattern detector.
DESCRIPTION
POWER AND GROUND
SIGNAL NAME
PIN #
TYPE
TAGND
7
****
Transmitter Analog Ground
TAVDD
9
****
Transmitter Analog Positive Supply (3.3V + 5%)
RAGND
6
****
Receiver Analog Ground
RAVDD
3
****
Receiver Analog Positive Supply (3.3V± 5%)
VDDPLL
12
****
Analog Positive Supply for Master Clock Synthesizer PLL (3.3V± 5%)
GNDPLL
15
****
Analog Ground for Master Clock Synthesizer PLL
DVDD
36
****
Digital Positive Supply (3.3V± 5%)
AVDD
31
****
Analog Positive Supply (3.3V± 5%)
DGND
37
****
Digital Ground
AGND
32
****
Analog Ground
16
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
FUNCTIONAL DESCRIPTION
The XRT83L30 is a fully integrated single channel long-haul and short-haul transceiver intended for T1, J1 or
E1 systems. Simplified block diagrams of the device are shown in Figure 1, Host mode and Figure 2,
Hardware mode. The XRT83L30 can receive signals that have been attenuated from 0 to 36dB at 772kHz (0
to 6000 feet cable loss) for T1 and from 0 to 43dB at 1024kHz for E1 systems.
In T1 applications, the XRT83L30 can generate five transmit pulse shapes to meet the short-haul Digital Crossconnect (DSX-1) template requirement as well as four CSU Line Build-Out (LBO) filters of 0dB, -7.5dB, -15dB
and -22.5dB as required by FCC rules. It also provides programmable transmit output pulse generator that can
be used for output pulse shaping allowing performance improvement over a wide variety of conditions. The
operation and configuration of the XRT83L30 can be controlled through a serial microprocessor Host interface
or, by Hardware control.
MASTER CLOCK GENERATOR
Using a variety of external clock sources, the on-chip frequency synthesizer generates the T1 (1.544MHz) or
E1 (2.048MHz) master clocks necessary for the transmit pulse shaping and receive clock recovery circuit.
There are two master clock inputs MCLKE1 and MCLKT1. In systems where both T1 and E1 master clocks are
available these clocks can be connected to the respective pins.
In systems that have only one master clock source available (E1 or T1), that clock should be connected to both
MCLKE1 and MCLKT1 inputs for proper operation. T1 or E1 master clocks can be generated from 8kHz,
16kHz, 56kHz, 64kHz, 128kHz and 256kHz external clocks under the control of CLKSEL[2:0] inputs according
to Table 1.
NOTE: EQC[4:0] determine the T1/E1 operating mode. See Table 5 for details.
FIGURE 4. TWO INPUT CLOCK SOURCE
Two Input Clock Sources
2.048MHz
+/-50ppm
MCLKE1
MCLKOUT
1.544MHz
+/-50ppm
MCLKT1
1.544MHz
or
2.048MHz
FIGURE 5. ONE INPUT CLOCK SOURCE
Input Clock Options
8kHz
16kHz
56kHz
64kHz
128kHz
256kHz
1.544MHz
2.048MHz
One Input Clock Source
MCLKE1
MCLKOUT
MCLKT1
17
1.544MHz
or
2.048MHz
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 1: MASTER CLOCK GENERATOR
MCLKE1
KHZ
MCLKT1
KHZ
CLKSEL2
CLKSEL1
CLKSEL0
MCLKRATE
MASTER CLOCK
KHZ
2048
2048
0
0
0
0
2048
2048
2048
0
0
0
1
1544
2048
1544
0
0
0
0
2048
1544
1544
0
0
1
1
1544
1544
1544
0
0
1
0
2048
2048
1544
0
0
1
1
1544
8
x
0
1
0
0
2048
8
x
0
1
0
1
1544
16
x
0
1
1
0
2048
16
x
0
1
1
1
1544
56
x
1
0
0
0
2048
56
x
1
0
0
1
1544
64
x
1
0
1
0
2048
64
x
1
0
1
1
1544
128
x
1
1
0
0
2048
128
x
1
1
0
1
1544
256
x
1
1
1
0
2048
256
x
1
1
1
1
1544
In Host mode the programming is achieved through the corresponding interface control bits, the state of the
CLKSEL[2:0] control bits and the state of the MCLKRATE interface control bit.
RECEIVER
RECEIVER INPUT
At the receiver input, a cable attenuated AMI signal can be coupled to the receiver through a capacitor or a 1:1
transformer. The input signal is first applied to a selective equalizer for signal conditioning. The maximum
equalizer gain is up to 36dB for T1 and 43dB for E1 modes. The equalized signal is subsequently applied to a
peak detector which in turn controls the equalizer settings and the data slicer. The slicer threshold for both E1
and T1 is typically set at 50% of the peak amplitude at the equalizer output. After the slicers, the digital
representation of the AMI signals are applied to the clock and data recovery circuit. The recovered data
subsequently goes through the jitter attenuator and decoder (if selected) for HDB3 or B8ZS decoding before
being applied to the RPOS/RDATA and RNEG/LCV pins. Clock recovery is accomplished by a digital phaselocked loop (DPLL) which does not require any external components and can tolerate high levels of input jitter
that meets or exceeds the ITU-G.823 and TR-TSY000499 standards.
In Hardware mode only, this receive channel is turned on upon power-up and is always on. In Host mode, the
receiver can be turned on or off with the RXON bit. SEE”MICROPROCESSOR REGISTER #2 BIT
DESCRIPTION” ON PAGE 48.
18
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
RECEIVE MONITOR MODE
In applications where Monitor mode is desired, the equalizer can be configured in a gain mode which handles
input signals attenuated resistively up to 29dB, along with 0 to 6dB cable attenuation for both T1 and E1
applications, refer to Table 5 for details. This feature is available in both Hardware and Host modes.
RECEIVER LOSS OF SIGNAL (RLOS)
For compatibility with ITU G.775 requirements, the RLOS monitoring function is implemented using both
analog and digital detection schemes. If the analog RLOS condition occurs, a digital detector is activated to
count for 32 consecutive zeros in E1 (4096 bits in Extended Los mode, EXLOS = “1”) or 175 consecutive zeros
in T1 before RLOS is asserted. RLOS is cleared when the input signal rises +3dB (built in hysteresis) above
the point at which it was declared and meets 12.5% ones density of 4 ones in a 32 bit window, with no more
than 16 consecutive zeros for E1. In T1 mode, RLOS is cleared when the input signal rises +3dB (built in
hysteresis) above the point at which it was declared and contains 16 ones in a 128 bit window with no more
than 100 consecutive zeros in the data stream. When loss of signal occurs, RLOS register indication and
register status will change. If the RLOS register enable is set high (enabled), the alarm will trigger an interrupt
causing the interrupt pin (INT) to go low. Once the alarm status register has been read, it will automatically
reset upon read (RUR), and the INT pin will return high.
Analog RLOS
Setting the Receiver Input to -15dB T1/E1 Short Haul Mode
By setting the receiver input to -15dB T1/E1 short haul mode, the equalizer will detect the incoming amplitude
and make adjustments by adding gain up to a maximum of +15dB normalizing the T1/E1 input signal.
NOTE: This setting refers to cable loss (frequency), not flat loss (resistive).
Once the T1/E1 input signal has been normalized to 0dB by adding the maximum gain (+15dB), the receiver
will declare RLOS if the signal is attenuated by an additional -9dB. The total cable loss at RLOS declaration is
typically -24dB (-15dB + -9dB). A 3dB hysteresis was designed so that transients will not trigger the RLOS to
clear. Therefore, the RLOS will typically clear at a total cable attenuation of -21dB. See Figure 6 for a
simplified diagram.
FIGURE 6. SIMPLIFIED DIAGRAM OF -15dB T1/E1 SHORT HAUL MODE AND RLOS CONDITION
Norm alized up to +15dB Max
-9dB
Clear LOS
+3dB
Declare LOS
Declare LOS
+3dB
Clear LOS
-9dB
Norm alized up to +15dB Max
Setting the Receiver Input to -29dB T1/E1 Gain Mode
By setting the receiver input to -29dB T1/E1 gain mode, the equalizer will detect the incoming amplitude and
make adjustments by adding gain up to a maximum of +29dB normalizing the T1/E1 input signal.
NOTE: This is the only setting that refers to flat loss (resistive). All other modes refer to cable loss (frequency).
19
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
Once the T1/E1 input signal has been normalized to 0dB by adding the maximum gain (+29dB), the receiver
will declare RLOS if the signal is attenuated by an additional -9dB. The total cable loss at RLOS declaration is
typically -38dB (-29dB + -9dB). A 3dB hysteresis was designed so that transients will not trigger the RLOS to
clear. Therefore, the RLOS will typically clear at a total flat loss of -35dB. See Figure 7 for a simplified diagram.
FIGURE 7. SIMPLIFIED DIAGRAM OF -29dB T1/E1 GAIN MODE AND RLOS CONDITION
Norm alized up to +29dB Max
-9dB
Clear LOS
+3dB
Declare LOS
Declare LOS
+3dB
Clear LOS
-9dB
Norm alized up to +29dB Max
Setting the Receiver Input to -36dB T1/E1 Long Haul Mode
By setting the receiver input to -36dB T1/E1 long haul mode, the equalizer will detect the incoming amplitude
and make adjustments by adding gain up to a maximum of +36dB normalizing the T1 input signal. This setting
refers to cable loss (frequency), not flat loss (resistive). Once the T1/E1 input signal has been normalized to
0dB by adding the maximum gain (+36dB), the receiver will declare RLOS if the signal is attenuated by an
additional -9dB. The total cable loss at RLOS declaration is typically -45dB (-36dB + -9dB). A 3dB hysteresis
was designed so that transients will not trigger the RLOS to clear. Therefore, the RLOS will typically clear at a
total cable attenuation of -42dB. See Figure 8 for a simplified diagram.
FIGURE 8. SIMPLIFIED DIAGRAM OF -36dB T1/E1 LONG HAUL MODE AND RLOS CONDITION
Norm alized up to +36dB Max
-9dB
Clear LOS
+3dB
Declare LOS
Declare LOS
+3dB
Clear LOS
-9dB
Norm alized up to +36dB Max
E1 Extended RLOS
E1: Setting the Receiver Input to Extended RLOS
By setting the receiver input to extended RLOS, the equalizer will detect the incoming amplitude and make
adjustments by adding gain up to a maximum of +43dB normalizing the E1 input signal. This setting refers to
20
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
cable loss (frequency), not flat loss (resistive). Once the E1 input signal has been normalized to 0dB by adding
the maximum gain (+43dB), the receiver will declare RLOS if the signal is attenuated by an additional -9dB.
The total cable loss at RLOS declaration is typically -52dB (-43dB + -9dB). A 3dB hysteresis was designed so
that transients will not trigger the RLOS to clear. Therefore, the RLOS will typically clear at a total cable
attenuation of -49dB. See Figure 9 for a simplified diagram.
FIGURE 9. SIMPLIFIED DIAGRAM OF EXTENDED RLOS MODE (E1 ONLY)
Norm alized up to +45dB Max
-9dB
Clear LOS
+3dB
Declare LOS
Declare LOS
+3dB
Clear LOS
-9dB
Norm alized up to +45dB Max
RECEIVE HDB3/B8ZS DECODER
The Decoder function is available in both Hardware and Host modes by controlling the TNEG/CODE pin or
the CODE interface bit. The decoder function is only active in single-rail Mode. When selected, receive data in
this mode will be decoded according to HDB3 rules for E1 and B8ZS for T1 systems. Bipolar violations that do
not conform to the coding scheme will be reported as Line Code Violation at the RNEG/LCV pin. The length of
the LCV pulse is one RCLK cycle for each code violation. Excessive number of zeros in the receive data
stream is also reported as an error at the same output pin. If AMI decoding is selected in single rail mode,
every bipolar violation in the receive data stream will be reported as an error at the RNEG/LCV pin.
RECOVERED CLOCK (RCLK) SAMPLING EDGE
This feature is available in both Hardware and Host modes. In Host mode, the sampling edge of RCLK output
can be changed through the interface control bit RCLKE. If a “1” is written in the RCLKE interface bit, receive
data output at RPOS/RDATA and RNEG/LCV are updated on the falling edge of RCLK. Writing a “0” to the
RCLKE register, updates the receive data on the rising edge of RCLK. In Hardware mode the same feature is
available under the control of the RCLKE pin.
FIGURE 10. RECEIVE CLOCK AND OUTPUT DATA TIMING
RCLKR
RDY
RCLK
RPOS
or
RNEG
RHO
21
RCLKF
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
JITTER ATTENUATOR
To reduce phase and frequency jitter in the recovered clock, the jitter attenuator can be placed in the receive
signal path. The jitter attenuator uses a data FIFO (First In First Out) with a programmable depth that can vary
between 2x32 and 2x64. The jitter attenuator can also be placed in the transmit signal path or disabled
altogether depending upon system requirements. The jitter attenuator, other than using the master clock as
reference, requires no external components. With the jitter attenuator selected, the typical throughput delay
from input to output is 16 bits for 32 bit FIFO size or 32 bits for 64 bit FIFO size. When the read and write
pointers of the FIFO in the jitter attenuator are within two bits of over-flowing or under-flowing, the bandwidth of
the jitter attenuator is widened to track the short term input jitter, thereby avoiding data corruption. When this
situation occurs, the jitter attenuator will not attenuate input jitter until the read/write pointer's position is outside
the two bits window. Under normal condition, the jitter transfer characteristic meets the narrow bandwidth
requirement as specified in ITU- G.736, ITU- I.431 and AT&T Pub 62411 standards.
In T1 mode the Jitter Attenuator Bandwidth is always set to 3Hz. In E1 mode, the bandwidth can be reduced
through the JABW control signal. When JABW is set “High” the bandwidth of the jitter attenuator is reduced
from 10Hz to 1.5Hz. Under this condition the FIFO length is automatically set to 64 bits and the 32 bits FIFO
length will not be available in this mode.
GAPPED CLOCK (JA MUST BE ENABLED IN THE TRANSMIT PATH)
The XRT83L30 LIU is ideal for multiplexer or mapper applications where the network data crosses multiple
timing domains. As the higher data rates are de-multiplexed down to T1 or E1 data, stuffing bits are removed
which can leave gaps in the incoming data stream. If the jitter attenuator is enabled in the transmit path, the
32-Bit or 64-Bit FIFO is used to smooth the gapped clock into a steady T1 or E1 output. The maximum gap
width is shown in Table 2.
TABLE 2: MAXIMUM GAP WIDTH FOR MULTIPLEXER/MAPPER APPLICATIONS
FIFO DEPTH
MAXIMUM GAP WIDTH
32-Bit
20 UI
64-Bit
50 UI
NOTE: If the LIU is used in a loop timing system, the jitter attenuator should be enabled in the receive path.
22
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
ARBITRARY PULSE GENERATOR
In T1 mode only, the arbitrary pulse generator divides the pulse into eight individual segments. Each segment
is set by a 7-Bit binary word by programming the appropriate register. This allows the system designer to set
the overshoot, amplitude, and undershoot for a unique line build out. The MSB (bit 7) is a sign-bit. If the sign-bit
is set to “1”, the segment will move in a positive direction relative to a flat line (zero) condition. If this sign-bit is
set to “0”, the segment will move in a negative direction relative to a flat line condition. A pulse with numbered
segments is shown in Figure 11.
FIGURE 11. ARBITRARY PULSE SEGMENT ASSIGNMENT
1
2
3
Segment
1
2
3
4
5
6
7
8
4
Register
0xn8
0xn9
0xna
0xnb
0xnc
0xnd
0xne
0xnf
8
7
6
5
NOTE: By default, the arbitrary segments are programmed to 0x00h. The transmitter output will result in an all zero pattern
to the line.
TRANSMITTER
DIGITAL DATA FORMAT
Both the transmitter and receiver can be configured to operate in dual or single-rail data formats. This feature is
available under both Hardware and Host control modes. The dual or single-rail data format is determined by
the state of the SR/DR pin in Hardware mode or SR/DR interface bit in the Host mode. In single-rail mode,
transmit clock and NRZ data are applied to TCLK and TPOS/TDATA pins respectively. In single-rail and
Hardware mode the TNEG/CODE input can be used as the CODES function. With TNEG/CODE tied “Low”,
HDB3 or B8ZS encoding and decoding are enabled for E1 and T1 modes respectively. With TNEG/CODE tied
“High”, the AMI coding scheme is selected. In both dual or single-rail modes of operations, the transmitter
converts digital input data to a bipolar format before being transmitted to the line.
TRANSMIT CLOCK (TCLK) SAMPLING EDGE
Serial transmit data at TPOS/TDATA and TNEG/CODE are clocked into the XRT83L30 under the
synchronization of TCLK. With a “0” written to the TCLKE interface bit, or by pulling the TCLKE pin “Low”, input
data is sampled on the falling edge of TCLK. The sampling edge is inverted with a “1” written to TCLKE
interface bit, or by connecting the TCLKE pin “High”.
23
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
FIGURE 12. TRANSMIT CLOCK AND INPUT DATA TIMING
TCLKR
TCLKF
TCLK
TPOS/TDATA
or
TNEG
THO
TSU
TRANSMIT HDB3/B8ZS ENCODER
The Encoder function is available in both Hardware and Host modes basis by controlling the TNEG/CODE pin
or CODES interface bit. The encoder is only available in single-rail mode. In E1 mode and with HDB3 encoding
selected, any sequence with four or more consecutive zeros in the input serial data from TPOS/TDATA, will be
removed and replaced with 000V or B00V, where “B” indicates a pulse conforming with the bipolar rule and “V”
representing a pulse violating the rule. An example of HDB3 Encoding is shown in Table 3. In a T1 system, an
input data sequence with eight or more consecutive zeros will be removed and replaced using the B8ZS
encoding rule. An example of Bipolar with 8 Zero Substitution (B8ZS) encoding scheme is shown in Table 4.
Writing a “1” into the CODES interface bit or connecting the TNEG/CODE pin to a “High” level selects the AMI
coding for both E1 or T1 systems.
TABLE 3: EXAMPLES OF HDB3 ENCODING
NUMBER OF PULSE BEFORE NEXT 4 ZEROS
Input
NEXT 4 BITS
0000
HDB3 (case1)
odd
000V
HDB3 (case2)
even
B00V
TABLE 4: EXAMPLES OF B8ZS ENCODING
CASE 1
PRECEDING PULSE
NEXT 8 BITS
Input
+
00000000
B8ZS
AMI Output
000VB0VB
+
000+ -0- +
-
00000000
CASE 2
Input
B8ZS
AMI Output
000VB0VB
-
DRIVER FAILURE MONITOR (DMO)
24
000- +0+ -
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
The driver monitor circuit is used to detect transmit driver failure by monitoring the activities at TTIP and
TRING. Driver failure may be caused by a short circuit in the primary transformer or system problems at the
transmit input. If the transmitter has no output for more than 128 clock cycles, the corresponding DMO pin
goes “High” and remains “High” until a valid transmit pulse is detected. In Host mode, the failure of the transmit
channel is reported in the corresponding interface bit. If the DMOIE bit is also enabled, any transition on the
DMO interface bit will generate an interrupt. The driver failure monitor is supported in both Hardware and Host
modes.
TRANSMIT PULSE SHAPER & LINE BUILD OUT (LBO) CIRCUIT
The transmit pulse shaper circuit uses the high speed clock from the Master timing generator to control the
shape and width of the transmitted pulse. The internal high-speed timing generator eliminates the need for a
tightly controlled transmit clock (TCLK) duty cycle. With the jitter attenuator not in the transmit path, the
transmit output will generate no more than 0.025Unit Interval (UI) peak-to-peak jitter. In Hardware mode, the
state of the EQC[4:0] pins determine the transmit pulse shape. In Host mode transmit pulse shape can be
controlled using the interface bits EQC[4:0]. The chip supports five fixed transmit pulse settings for T1 Shorthaul applications plus a fully programmable waveform generator for arbitrary transmit output pulse shapes.
Transmit Line Build-Outs for T1 long-haul application are supported from 0dB to -22.5dB in three 7.5dB steps.
The choice of the transmit pulse shape and LBO under the control of the interface bits are summarized in
Table 5. For CSU LBO transmit pulse design information, refer to ANSI T1.403-1993 Network-to-Customer
Installation specification, Annex-E.
NOTE: EQC[4:0] determine the T1/E1 operating mode of the XRT83L30. When EQC4 = “1” and EQC3 = “1”, the XRT83L30
is in the E1 mode, otherwise it is in the T1/J1 mode.
TABLE 5: RECEIVE EQUALIZER CONTROL AND TRANSMIT LINE BUILD-OUT SETTINGS
EQC4
EQC3
EQC2
EQC1
EQC0
E1/T1 MODE & RECEIVE
SENSITIVITY
TRANSMIT LBO
CABLE
CODING
0
0
0
0
0
T1 Long Haul/36dB
0dB
100Ω/ TP
B8ZS
0
0
0
0
1
T1 Long Haul/36dB
-7.5dB
100Ω/ TP
B8ZS
0
0
0
1
0
T1 Long Haul/36dB
-15dB
100Ω/ TP
B8ZS
0
0
0
1
1
T1 Long Haul/36dB
-22.5dB
100Ω/ TP
B8ZS
0
0
1
0
0
T1 Long Haul/45dB
0dB
100Ω/ TP
B8ZS
0
0
1
0
1
T1 Long Haul/45dB
-7.5dB
100Ω/ TP
B8ZS
0
0
1
1
0
T1 Long Haul/45dB
-15dB
100Ω/ TP
B8ZS
0
0
1
1
1
T1 Long Haul/45dB
-22.5dB
100Ω/ TP
B8ZS
0
1
0
0
0
T1 Short Haul/15dB
0-133 ft./ 0.6dB
100Ω/ TP
B8ZS
0
1
0
0
1
T1 Short Haul/15dB
133-266 ft./ 1.2dB
100Ω/ TP
B8ZS
0
1
0
1
0
T1 Short Haul/15dB
266-399 ft./ 1.8dB
100Ω/ TP
B8ZS
0
1
0
1
1
T1 Short Haul/15dB
399-533 ft./ 2.4dB
100Ω/ TP
B8ZS
0
1
1
0
0
T1 Short Haul/15dB
533-655 ft./ 3.0dB
100Ω/ TP
B8ZS
0
1
1
0
1
T1 Short Haul/15dB
Arbitrary Pulse
100Ω/ TP
B8ZS
25
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 5: RECEIVE EQUALIZER CONTROL AND TRANSMIT LINE BUILD-OUT SETTINGS
EQC4
EQC3
EQC2
EQC1
EQC0
E1/T1 MODE & RECEIVE
SENSITIVITY
0
1
1
1
0
T1 Gain Mode/29dB
0
1
1
1
1
1
0
0
0
1
0
0
1
0
1
CABLE
CODING
0-133 ft./ 0.6dB
100Ω/ TP
B8ZS
T1 Gain Mode/29dB
133-266 ft./ 1.2dB
100Ω/ TP
B8ZS
0
T1 Gain Mode/29dB
266-399 ft./ 1.8dB
100Ω/ TP
B8ZS
0
1
T1 Gain Mode/29dB
399-533 ft./ 2.4dB
100Ω/ TP
B8ZS
0
1
0
T1 Gain Mode/29dB
533-655 ft./ 3.0dB
100Ω/ TP
B8ZS
0
0
1
1
T1 Gain Mode/29dB
Arbitrary Pulse
100Ω/ TP
B8ZS
1
0
1
0
0
T1 Gain Mode/29dB
0dB
100Ω/ TP
B8ZS
1
0
1
0
1
T1 Gain Mode/29dB
-7.5dB
100Ω/ TP
B8ZS
1
0
1
1
0
T1 Gain Mode/29dB
-15dB
100Ω/ TP
B8ZS
1
0
1
1
1
T1 Gain Mode/29dB
-22.5dB
100Ω/ TP
B8ZS
1
1
0
0
0
E1 Long Haul/36dB
ITU G.703
75Ω Coax
HDB3
1
1
0
0
1
E1 Long Haul/36dB
ITU G.703
120Ω TP
HDB3
1
1
0
1
0
E1 Long Haul/43dB
ITU G.703
75Ω Coax
HDB3
1
1
0
1
1
E1 Long Haul/43dB
ITU G.703
120Ω TP
HDB3
1
1
1
0
0
E1 Short Haul
ITU G.703
75Ω Coax
HDB3
1
1
1
0
1
E1 Short Haul
ITU G.703
120Ω TP
HDB3
1
1
1
1
0
E1 Gain Mode
ITU G.703
75Ω Coax
HDB3
1
1
1
1
1
E1 Gain Mode
ITU G.703
120Ω TP
HDB3
26
TRANSMIT LBO
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TRANSMIT AND RECEIVE TERMINATIONS
The XRT83L30 is a versatile LIU that can be programmed to use one Bill of Materials (BOM) for worldwide
applications for T1, J1 and E1. For specific applications the internal terminations can be disabled to allow the
use of existing components and/or designs.
RECEIVER
INTERNAL RECEIVE TERMINATION MODE
In Hardware mode, RXTSEL (Pin 44) can be tied “High” to select internal termination mode or tied “Low” to
select external termination mode. By default the XRT83L30 is set for external termination mode at power up or
at Hardware reset.
TABLE 6: RECEIVE TERMINATION CONTROL
RXTSEL
RX TERMINATION
0
EXTERNAL
1
INTERNAL
In Host mode, bit 7 in the appropriate register, (Table 20, “Microprocessor Register #1, Bit Description,”
on page 47), is set “High” to select the internal termination mode for the receive channel.
FIGURE 13. SIMPLIFIED DIAGRAM FOR THE INTERNAL RECEIVE AND TRANSMIT TERMINATION MODE
TTIP
TPOS
1
Rint
T1
5
0.68µF
TNEG
TCLK
TTIP
75 Ω, 100 Ω
110 Ω or 120 Ω
TX
Line Driver
TRING
4
1:2
8
TRING
Rint
RTIP
RPOS
5
T2
1
RNEG
RCLK
RX
Equalizer
RTIP
75 Ω, 100 Ω
110 Ω or 120 Ω
Rint
8
1:1
4
RRING
RRING
If the internal termination mode (RXTSEL = “1”) is selected, the effective impedance for E1, T1 or J1 can be
achieved either with an internal resistor or a combination of internal and external resistors as shown in Table 7.
27
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 7: RECEIVE TERMINATIONS
RXTSEL
TERSEL1
TERSEL0
RXRES1
RXRES0
Rext
Rint
MODE
0
x
x
x
x
Rext
∞
T1/E1/J1
1
0
0
0
0
∞
100Ω
T1
1
0
1
0
0
∞
110Ω
J1
1
1
0
0
0
∞
75Ω
E1
1
1
1
0
0
∞
120Ω
E1
1
0
0
0
1
240Ω
172Ω
T1
1
0
1
0
1
240Ω
204Ω
J1
1
1
0
0
1
240Ω
108Ω
E1
1
1
1
0
1
240Ω
240Ω
E1
1
0
0
1
0
210Ω
192Ω
T1
1
0
1
1
0
210Ω
232Ω
J1
1
1
0
1
0
210Ω
116Ω
E1
1
1
1
1
0
210Ω
280Ω
E1
1
0
0
1
1
150Ω
300Ω
T1
1
0
1
1
1
150Ω
412Ω
J1
1
1
0
1
1
150Ω
150Ω
E1
1
1
1
1
1
150Ω
600Ω
E1
Figure 14 is a simplified diagram for T1 (100Ω) in the external receive termination mode. Figure 15 is a
simplified diagram for E1 (75Ω) in the external receive termination mode.
FIGURE 14. SIMPLIFIED DIAGRAM FOR T1 IN THE EXTERNAL TERMINATION MODE (RXTSEL= 0)
XRT83L30 LIU
3.1Ω
1:2 or
1:2.45
TTIP
100Ω
3.1Ω
TRING
RTIP
100Ω
100Ω
RRING
1:1
28
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
FIGURE 15. SIMPLIFIED DIAGRAM FOR E1 IN EXTERNAL TERMINATION MODE (RXTSEL= 0)
XRT83L30 LIU
9.1 Ω
1:2
TTIP
75 Ω
9.1 Ω
TRING
RTIP
75 Ω
75 Ω
RRING
1:1
TRANSMITTER
TRANSMIT TERMINATION MODE
In Hardware mode, TXTSEL (Pin 45) can be tied “High” to select internal termination mode or tied “Low” for
external termination. In Host mode, bit 6 in the appropriate register is set “High” to select the internal
termination mode for the transmit channel, see Table 19, “Microprocessor Register #1 bit description,” on
page 46.
TABLE 8: TRANSMIT TERMINATION CONTROL
TXTSEL
TX TERMINATION
TX TRANSFORMER RATIO
0
EXTERNAL
1:2.45
1
INTERNAL
1:2
For internal termination, the transformer turns ratio is always 1:2. In internal mode, no external resistors are
used. An external capacitor of 0.68µF is used for proper operation of the internal termination circuitry, see
Figure 13.
TABLE 9: TERMINATION SELECT CONTROL
TERSEL1
TERSEL0
TERMINATION
0
0
100Ω
0
1
110Ω
1
0
75Ω
1
1
120Ω
EXTERNAL TRANSMIT TERMINATION MODE
By default the XRT83L30 is set for external termination mode at power up or at Hardware reset.
When external transmit termination mode is selected, the internal termination circuitry is disabled. The value of
the external resistors is chosen for a specific application according to the turns ratio selected by TRATIO (Pin
26) in Hardware mode or bit 0 in the appropriate register in Host mode, see Table 10 and Table 21,
“Microprocessor Register #3 bit description,” on page 50. Figure 14 is a simplified block diagram for T1
(100Ω) in the external termination mode. Figure 15 is a simplified block diagram for E1 (75Ω) in the external
termination mode.
29
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 10: TRANSMIT TERMINATION CONTROL
TRATIO
TURNS RATIO
0
1:2
1
1:2.45
Table 11 summarizes the transmit terminations.
TABLE 11: TRANSMIT TERMINATIONS
TERSEL1
TERSEL0
TXTSEL
TRATIO
0=EXTERNAL
Rint Ω
SET BY
CONTROL
1=INTERNAL
T1
100 Ω
J1
110 Ω
E1
75 Ω
E1
120 Ω
n
Rext Ω
Cext
n, Rext, AND Cext ARE SUGGESTED
SETTINGS
BITS
0
0
0
0
0Ω
2.45
3.1Ω
0
0
0
0
1
0Ω
2
3.1Ω
0
0
0
1
x
25Ω
2
0Ω
0.68µF
0
1
0
0
0Ω
2.45
3.1Ω
0
0
1
0
1
0Ω
2
3.1Ω
0
0
1
1
x
27.5Ω
2
0Ω
0.68µF
1
0
0
0
0Ω
2.45
6.2Ω
0
1
0
0
1
0Ω
2
9.1Ω
0
1
0
1
x
18.75Ω
2
0Ω
0.68µF
1
1
0
0
0Ω
2.45
6.2Ω
0
1
1
0
1
0Ω
2
9.1Ω
0
1
1
1
x
30Ω
2
0Ω
0.68µF
REDUNDANCY APPLICATIONS
Telecommunication system design requires signal integrity and reliability. When a T1/E1 primary line card has
a failure, it must be swapped with a backup line card while maintaining connectivity to a backplane without
losing data. System designers can achieve this by implementing common redundancy schemes with the
XRT83L30 Line Interface Unit (LIU). The XRT83L30 offers features that are tailored to redundancy applications
while reducing the number of components and providing system designers with solid reference designs. These
features allow system designers to implement redundancy applications that ensure reliability. The Internal
Impedance mode eliminates the need for external relays when using the 1:1 and 1+1 redundancy schemes.
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XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
PROGRAMMING CONSIDERATIONS
In many applications switching the control of the transmitter outputs and the receiver line impedance to
hardware control will provide faster transmitter ON/OFF switching.
In Host Mode, there are two bits in register 18 (12H) that control the transmitter outputs and the Rx line
impedance select, TXONCNTL (Bit 5) and TERCNTL (Bit 4).
Setting bit-5 (TXONCNTL) to a “1” transfers the control of the Transmit On/Off function to the TXON Hardware
control pin (pin 58).
Setting bit-4 (TERCNTL) to a “1” transfers the control of the Rx line impedance select (RXTSEL) to the
RXTSEL Hardware control pin (pin 44).
Either mode works well with redundancy applications. The user can determine which mode has the fastest
switching time for a unique application.
TYPICAL REDUNDANCY SCHEMES
■
·1:1 One backup card for every primary card (Facility Protection)
■
·1+1 One backup card for every primary card (Line Protection)
■
·N+1One backup card for N primary cards
1:1 REDUNDANCY
A 1:1 facility protection redundancy scheme has one backup card for every primary card. When using 1:1
redundancy, the backup card has its transmitters tri-stated and its receivers in high impedance. This eliminates
the need for external relays and provides one bill of materials for all interface modes of operation. The transmit
and receive sections of the LIU device are described separately.
1+1 REDUNDANCY
A 1+1 line protection redundancy scheme has one backup card for every primary card, and the receivers on
the backup card are monitoring the receiver inputs. Therefore, the receivers on both cards need to be active.
The transmit outputs require no external resistors. The transmit and receive sections of the LIU device are
described separately.
TRANSMIT 1:1 & 1+1 REDUNDANCY
For 1:1 and 1+1 redundancy, the transmitters on the primary and backup card should be programmed for
Internal Impedance mode. The transmitters on the backup card should be tri-stated. Select the appropriate
impedance for the desired mode of operation, T1/E1/J1. A 0.68uF capacitor is used in series with TTIP for
blocking DC bias. See Figure 16 for a simplified block diagram of the transmit section for 1:1 and 1+1
redundancy scheme.
NOTE: For simplification, the over voltage protection circuitry was omitted.
31
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
FIGURE 16. SIMPLIFIED BLOCK DIAGRAM OF THE TRANSMIT SECTION FOR 1:1 & 1+1 REDUNDANCY
Backplane Interface
Primary Card
Line Interface Card
XRT83L30
1:2
0.68µF
Tx
T1/E1 Line
TxTSEL=1, Internal
Backup Card
XRT83L30
0.68µF
Tx
TxTSEL=1, Internal
RECEIVE 1:1 & 1+1 REDUNDANCY
For 1:1 and 1+1 redundancy, the receivers on the primary card should be programmed for Internal Impedance
mode. The receivers on the backup card should be programmed for External Impedance mode. Since there is
no external resistor in the circuit, the receivers on the backup card will be high impedance. This key design
feature eliminates the need for relays and provides one bill of materials for all interface modes of operation.
Select the impedance for the desired mode of operation, T1/E1/J1. To swap the primary card, set the backup
card to Internal Impedance mode, then the primary card to External Impedance mode. See Figure 17 for a
simplified block diagram of the receive section for a 1:1 and 1+1 redundancy scheme.
NOTE: For simplification, the over voltage protection circuitry was omitted.
FIGURE 17. SIMPLIFIED BLOCK DIAGRAM - RECEIVE SECTION FOR 1:1 AND 1+1 REDUNDANCY
Backplane Interface
Primary Card
Line Interface Card
XRT83L30
1:1
Rx
T1/E1 Line
RxTSEL=1, Internal
Backup Card
XRT83L30
Rx
RxTSEL=0, External
N+1 REDUNDANCY
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SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
N+1 redundancy has one backup card for N primary cards. Due to impedance mismatch and signal contention,
external relays are necessary when using this redundancy scheme. The advantage of relays is that they create
complete isolation between the primary cards and the backup card. This allows all transmitters and receivers
on the primary cards to be configured in internal impedance mode, providing one bill of materials for all
interface modes of operation. The transmit and receive sections of the XRT83L30 are described separately.
TRANSMIT
For N+1 redundancy, the transmitters on all cards should be programmed for internal impedance mode
providing one bill of materials for T1/E1/J1. The transmitters on the backup card do not have to be tri-stated. To
swap the primary card, close the desired relays, and tri-state the transmitters on the failed primary card. A
0.68µF capacitor is used in series with TTIP for blocking DC bias. See Figure 18 for a simplified block diagram
of the transmit section for an N+1 redundancy scheme.
NOTE: For simplification, the over voltage protection circuitry was omitted.
FIGURE 18. SIMPLIFIED BLOCK DIAGRAM - TRANSMIT SECTION FOR N+1 REDUNDANCY
Backplane Interface
Primary Card
Line Interface Card
XRT83L30
1:2
Tx
0.68µF
T1/E1 Line
TxTSEL=1, Internal
Primary Card
XRT83L30
1:2
Tx
T1/E1 Line
0.68µF
TxTSEL=1, Internal
Primary Card
XRT83L30
1:2
Tx
0.68µF
T1/E1 Line
TxTSEL=1, Internal
Backup Card
XRT83L30
Tx
0.68µF
TxTSEL=1, Internal
33
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
RECEIVE
For N+1 redundancy, the receivers on the primary cards should be programmed for internal impedance mode.
The receivers on the backup card should be programmed for external impedance mode. Since there is no
external resistor in the circuit, the receivers on the backup card will be high impedance. Select the impedance
for the desired mode of operation, T1/E1/J1. To swap the primary card, set the backup card to internal
impedance mode, then the primary card to external impedance mode. See Figure 19. for a simplified block
diagram of the receive section for a N+1 redundancy scheme.
NOTE: For simplification, the over voltage protection circuitry was omitted.
FIGURE 19. SIMPLIFIED BLOCK DIAGRAM - RECEIVE SECTION FOR N+1 REDUNDANCY
Backplane Interface
Primary Card
Line Interface Card
XRT83L30
1:1
Rx
T1/E1 Line
RxTSEL=1, Internal
Primary Card
XRT83L30
1:1
Rx
T1/E1 Line
RxTSEL=1, Internal
Primary Card
XRT83L30
1:1
T1/E1 Line
Rx
RxTSEL=1, Internal
Backup Card
XRT83L30
Rx
RxTSEL=1, External
34
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SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
PATTERN TRANSMIT AND DETECT FUNCTION
Several test and diagnostic patterns can be generated and detected by the chip. In Hardware mode the
channel can be programmed to transmit an All Ones pattern by applying a “High” level to the corresponding
TAOS pin. In Host mode, the three interface bits TXTEST[2:0] control the pattern generation and detection
according to Table 12.
TABLE 12: PATTERN TRANSMISSION CONTROL
TXTEST2
TXTEST1
TXTEST0
TEST PATTERN
0
0
0
Transmit Data
0
0
1
TAOS
0
1
0
TLUC
0
1
1
TLDC
1
0
0
TDQRSS
1
0
1
TDQRSS & INVQRSS
1
1
0
TDQRSS & INSBER
1
1
1
TDQRSS & INVQRSS & INSBER
TRANSMIT ALL ONES (TAOS)
This feature is available in both Hardware and Host modes. When the Hardware pins or interface bits
TXTEST2="0", TXTEST1="0" and TXTEST0="1", the transmitter ignores input from TPOS/TDATA and TNEG
pins and sends a continuous AMI encoded all ones signal to the line using TCLK clock as the reference. When
TCLK is not available, MCLK is used. In addition, when the Hardware pin or the interface bit ATAOS is
activated, the chip will automatically transmit the All Ones data when the receiver detects an RLOS condition.
The operation of this feature requires that TCLK not be tied "Low".
NETWORK LOOP CODE DETECTION AND TRANSMISSION
This feature is available in both Hardware and Host modes. When the Hardware pins or interface bits
TXTEST2="0", TXTEST1="1" and TXTEST0="0" the chip is enabled to transmit the "00001" Network Loop-Up
Code from a request for a loop-back condition from the remote terminal. Simultaneously setting the interface
bits NLCDE1="0" and NLCDE0="1" enables the Network Loop-Up code detection in the receiver. If the "00001"
Network Loop-Up code is detected in the receive data for longer than 5 seconds, the NLCD bit in the interface
register is set indicating that the remote terminal has activated remote Loop-back and the chip is receiving its
own transmitted data. When Network Loop-Up code is being transmitted the XRT83L30 will ignore the Automatic Loop-Code detection and Remote Loop-back activation (NLCDE1=”1”, NLCDE0=”1”, if activated) in
order to avoid activating Remote Digital Loop-back automatically when the remote terminal responds to the
Loop-back request.
When TXTEST2="0", TXTEST1="1" and TXTEST0="1" the chip is enabled to transmit the Network Loop-Down
Code "001" from the transmitter requesting the remote terminal the removal of the Loop-Back condition.
In both Hardware and Host modes the receiver is capable of monitoring the contents of the receive data for
the presence of Loop-Up or Loop-Down code from the remote terminal. The Hardware pins or interface bits
35
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
NLCDE[1:0] control the Loop-Code detection according to Table 13.
TABLE 13: LOOP-CODE DETECTION CONTROL
NLCDE1
NLCDE0
CONDITION
0
0
Disable Loop-Code Detection
0
1
Detect Loop-Up Code in Receive Data
1
0
Detect Loop-Down Code in Receive Data
1
1
Automatic Loop-Code detection and Remote Loop-Back Activation
Setting the Hardware pins or interface bits NLCDE1="0" and NLCDE0="1" activates the detection of the LoopUp code in the receive data. If the "00001" Network Loop-Up code is detected in the receive data for longer
than 5 seconds the NLCD interface bit is set to "1" and stays in this state for as long as the receiver continues
to receive the Network Loop-Up Code. In this mode if the NLCD interrupt is enabled, the chip will initiate an
interrupt on every transition of NLCD. The host has the option to ignore the request from the remote terminal,
or to respond to the request and manually activate Remote Loop-Back. The host can subsequently activate the
detection of the Loop-Down Code by setting NLCDE1="1" and NLCDE0="0". In this case, receiving the "001"
Loop-Down Code for longer than 5 seconds will set the NLCD bit to "1" and if the NLCD interrupt is enabled,
the chip will initiate an interrupt on every transition of NLCD. The host can respond to the request from the
remote terminal and remove Loop-Back condition. In the manual Network Loop-Up (NLCDE1="0" and
NLCDE0="1") and Loop-Down (NLCDE1="1" and NLCDE0="0") Code detection modes, the NLCD pin or
interface bit will be set to "1" upon receiving the corresponding code in excess of 5 seconds in the receive data.
In Host mode the chip will initiate an interrupt any time the status of the NLCD bit changes and the Network
Loop-code interrupt is enabled.
Setting the Hardware pins or interface bits NLCDE1="1" and NLCDE0="1" enables the automatic Loop-Code
detection and Remote Loop-Back activation mode if, TXTEST[2:0] is NOT equal to “110”. As this mode is
initiated, the state of the NLCD pin or interface bit is reset to "0" and the chip is programmed to monitor the
receive input data for the Loop-Up Code. If the "00001" Network Loop-Up Code is detected in the receive data
for longer than 5 seconds in addition to setting the NLCD pin or interface bit, Remote loop-back is
automatically activated. The chip stays in remote loop-back even if it stops receiving the "00001" pattern. After
the chip detects the Loop-Up code, sets the NLCD pin (bit) and enters Remote loop-back, it automatically
starts monitoring the receive data for the Loop-Down code. In this mode however, the NLCD pin (bit) stays set
even if the receiver stops receiving the Loop-Up code, which is an indication to the host that the Remote loopback is still in effect. Remote loop-back is removed if the chip detects the "001" Loop-Down code for longer
than 5 seconds. Detecting the "001" code also results in resetting the NLCD pin (bit) and initiating an interrupt.
The Remote loop-back can also be removed by taking the chip out of the Automatic detection mode by
programming it to operate in a different state. The chip will not respond to remote loop-back request if an
Analog loop-back is activated locally. When programmed in Automatic detection mode the NLCD pin (bit) stays
"High" for the whole time the Remote loop-back is activated and in the Host mode it initiates an interrupt any
time the status of the NLCD bit changes provided the Network Loop-code interrupt is enabled.
TRANSMIT AND DETECT QUASI-RANDOM SIGNAL SOURCE (TDQRSS)
The XRT83L30 includes a QRSS pattern generation and detection block for diagnostic purposes that can be
activated only in the Host mode by setting the interface bits TXTEST2=”1”, TXTEST1=”0” and TXTEST0=”0”.
For T1 systems, the QRSS pattern is a 220-1pseudo-random bit sequence (PRBS) with no more than 14
consecutive zeros. For E1 systems, the QRSS pattern is 215 -1 PRBS with an inverted output. With QRSS and
Analog Local Loop-Back enabled simultaneously, and by monitoring the status of the QRPD interface bit, all
main functional blocks within the transceiver can be verified.
When the receiver achieves QRSS synchronization with fewer than 4 errors in a 128 bits window, QRPD
changes from “Low” to “High”. After pattern synchronization, any bit error will cause QRPD to go “Low” for one
clock cycle. If the QRPDIE bit is enabled, any transition on the QRPD bit will generate an interrupt.
36
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
With TDQRSS activated, a bit error can be inserted in the transmitted QRSS pattern by transitioning the
INSBER interface bit from “0” to “1”. Bipolar violation can also be inserted either in the QRSS pattern, or input
data when operating in the single-rail mode by transitioning the INSBPV interface bit from “0” to “1”. The state
of INSBER and INSBPV bits are sampled on the rising edge of the TCLK. To insure the insertion of the bit error
or bipolar violation, a “0” should be written in these bit locations before writing a “1”.
37
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
LOOP-BACK MODES
The XRT83L30 supports several Loop-Back modes under both Hardware and Host control. In Hardware
mode the two LOOP[1:0] pins control the Loop-Back functions according to Table 14.
TABLE 14: LOOP-BACK CONTROL IN HARDWARE MODE
LOOP1
LOOP0
LOOP-BACK MODE
0
0
None
0
1
Analog
1
0
Remote
1
1
Digital
In Host mode the Loop-Back functions are controlled by the three LOOP[2:0] interface bits. The LIU can be
programmed according to Table 15.
TABLE 15: LOOP-BACK CONTROL IN HOST MODE
LOOP2
LOOP1
LOOP0
LOOP-BACK MODE
0
X
X
None
1
0
0
Dual
1
0
1
Analog
1
1
0
Remote
1
1
1
Digital
LOCAL ANALOG LOOP-BACK (ALOOP)
With Local Analog Loop-Back activated, the transmit data at TTIP and TRING are looped-back to the analog
input of the receiver. External inputs at RTIP/RRING in this mode are ignored while valid transmit data
continues to be sent to the line. Local Analog Loop-Back exercises most of the functional blocks of the
XRT83L30 including the jitter attenuator which can be selected in either the transmit or receive paths. Local
Analog Loop-Back is shown in Figure 20.
FIGURE 20. LOCAL ANALOG LOOP-BACK SIGNAL FLOW
TPOS
TNEG
Encoder
TTIP
Timing
Control
JA
Tx
TRING
TCLK
RCLK
RPOS
Decoder
Data &
Clock
Recovery
RNEG
Rx
RTIP
RRING
In this mode, the jitter attenuator (if selected) can be placed in the transmit or receive path.
38
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
REMOTE LOOP-BACK (RLOOP)
With Remote Loop-Back activated, receive data after the jitter attenuator (if selected in the receive path) is
looped back to the transmit path using RCLK as transmit timing. In this mode transmit clock and data are
ignored, while RCLK and receive data will continue to be available at their respective output pins. Remote
Loop-Back with jitter attenuator selected in the receive path is shown in Figure 21.
FIGURE 21. REMOTE LOOP-BACK MODE WITH JITTER ATTENUATOR SELECTED IN RECEIVE PATH
TPOS
TNEG
Timing
Control
Encoder
TTIP
Tx
TRING
TCLK
RCLK
RPOS
Decoder
Data &
Clock
Recovery
JA
RTIP
Rx
RRING
RNEG
In the Remote Loop-Back mode if the jitter attenuator is selected in the transmit path, the receive data from the
Clock and Data Recovery block is looped back to the transmit path and is applied to the jitter attenuator using
RCLK as transmit timing. In this mode the transmit clock and data are also ignored, while RCLK and received
data will continue to be available at their respective output pins. Remote Loop-Back with the jitter attenuator
selected in the transmit path is shown in Figure 22.
FIGURE 22. REMOTE LOOP-BACK MODE WITH JITTER ATTENUATOR SELECTED IN TRANSMIT PATH
TPOS
TNEG
Encoder
Timing
Control
JA
TTIP
Tx
TRING
TCLK
RCLK
RPOS
Clock &
Data
Recovery
Decoder
RNEG
39
RTIP
Rx
RRING
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
DIGITAL LOOP-BACK (DLOOP)
Digital Loop-Back or Local Loop-Back allows the transmit clock and data to be looped back to the
corresponding receiver output pins through the encoder/decoder and jitter attenuator. In this mode, receive
data and clock are ignored, but the transmit data will be sent to the line uninterrupted. This loop back feature
allows users to configure the line interface as a pure jitter attenuator. The Digital Loop-Back signal flow is
shown in Figure 23.
FIGURE 23. DIGITAL LOOP-BACK MODE WITH JITTER ATTENUATOR SELECTED IN TRANSMIT PATH
TPOS
TNEG
Encoder
Timing
Control
JA
TTIP
Tx
TRING
TCLK
RCLK
RPOS
Data &
Clock
Recovery
Decoder
RTIP
Rx
RRING
RNEG
DUAL LOOP-BACK
Figure 24 depicts the data flow in dual-loopback. In this mode, selecting the jitter attenuator in the transmit
path will have the same result as placing the jitter attenuator in the receive path. In dual Loop-Back mode the
recovered clock and data from the line are looped back through the transmitter to the TTIP and TRING without
passing through the jitter attenuator. The transmit clock and data are looped back through the jitter attenuator
to the RCLK and RPOS/RDATA and RNEG pins.
FIGURE 24. SIGNAL FLOW IN DUAL LOOP-BACK MODE
TPOS
TNEG
Timing
Control
Encoder
TTIP
Tx
TRING
TCLK
JA
RCLK
RPOS
Data &
Clock
Recovery
Decoder
RNEG
40
RTIP
Rx
RRING
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
HOST MODE SERIAL INTERFACE OPERATION
XRT83L30 has a simple four wire Serial Interface that is compatible with many of the microcontrollers available
in the market. The Host mode operation is enabled by connecting pin 20 (HW/HOST) to a “Low”. The Serial
Interface provides a total of 32 “Read/Write” 8-bit registers that consists of the following signals:
CS
-
Chip Select (Active "Low")
SCLK
-
Serial Clock
SDI
-
Serial Data Input
SDO
-
Serial Data Output
USING THE MICROPROCESSOR SERIAL INTERFACE
The following instructions for using the Microprocessor Serial Interface are best understood by referring to the
diagram in Figure 25.
In order to use the Serial interface, a clock signal must be applied to the SCLK input pin. The maximum SCLK
clock frequency is 20MHz. A Read or Write operation can then be initiated by asserting the active-low Chip
Select (CS) input pin. For proper operation the CS must be asserted “Low” at least 50ns prior to the first rising
edge of the SCLK. Once the CS pin has been asserted, the Read/Write Operation and the target register can
be specified through the Serial Interface by writing eight serial bits into the SDI input. Each bit will be clocked
on the rising edge of SCLK.The function of the eight bits are identified and described below:
Bit 1:
R/W (Read/Write) Bit
This bit is clocked into the SDI input on the first rising edge of the SCLK after CS has been asserted. This bit
indicates whether the current operation is a “Read” or a “Write”. A “1” in this bit specifies a Read operation,
whereas a “0” specifies a “Write” operation.
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SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
Bit 2 through 6:The five (5) Address Values (labeled A0, A1, A2, A3 and A4)
The next five rising edges of the SCLK signal, clock in the 5-bit address value for the Read or Write operation.
These five bits define the register address within XRT83L30 that the user has selected to read data from or
write data to. The address bits must be supplied to the SDI input in ascending order with LSB (Least Significant
Bit) first.
Bit 7:
(A5)
The next bit A5 must be set to “0” as shown in Figure 25.
Bit 8:
(A6)
The value of A6 is a “don’t care”.
Once the first eight bits have been written into the Serial interface, the subsequent action depends on the
whether the current operation is a “Read” or “Write” instruction.
Read Operation
With the last address bit “A4” written into the SDI input, the “Read” operation will proceed through an idle
period lasting two SCLK periods. On the rising edge of the 9th SCLK the serial data output (SDO) becomes
active (see Figure 25). At this point the user can begin reading the 8-bit data (D0 through D7) stored in the
interface register at address [A4,A3,A2,A1,A0], in ascending order (LSB first), on the falling edge of SCLK.
Write Operation
With the last address bit (A4) written into the SDI input, the “Write” operation will proceed through an idle
period lasting two SCLK periods. Prior to the rising edge of the 9th SCLK, the user must begin to apply the
eight bit data word to the SDI input. The Serial Interface will latch this data on the rising edge of SCLK. The
serial data (D0 through D7) should enter the SDI input in ascending order with the LSB first.
Serial Interface Register Description
The serial Interface consists of 32 8-bit register locations. The Microprocessor register address map and Bit
map are described in Table 16 and Table 17 respectively. The function of the individual bits are described in
Table 18 through Table 36.
FIGURE 25. MICROPROCESSOR SERIAL INTERFACE DATA STRUCTURE
CS
SCLK
SDI
SDO
1
2
3
4
5
6
R/W Ao
A1
A2
A3
A4
7
0
8
9
A6
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
High Z
42
10
11
12
13
14
15
16
High Z
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 16: MICROPROCESSOR REGISTER ADDRESS
REGISTER ADDRESS
REGISTER NUMBER
FUNCTION
HEX
BINARY
0 - 18
0x00 - 0x12
00000 - 10010
Command and Control Registers
19 - 21
0x13 - 0x15
10011 - 10101
Reserved
22 - 29
0x16 - 0x1D
10110 - 11101
R/W registers reserved for testing purpose
30
0x1E
11110
Device "ID"
31
0x1F
11111
Device "Revision ID"
TABLE 17: MICROPROCESSOR REGISTER BIT MAP
REG. #
ADDRESS
REG.
TYPE
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Control Registers
0
00000
Hex 0x00
R/W
Reserved
Reserved
Reserved
EQC4
EQC3
EQC2
EQC1
EQC0
1
00001
Hex 0x01
R/W
RXTSEL
TXTSEL
TERSEL1
TERSEL0
JASEL1
JASEL0
JABW
FIFOS
2
00010
Hex 0x02
R/W
RXON
TXTEST2
TXTEST1
TXTEST0
TXON
LOOP2
LOOP1
LOOP0
3
00011
Hex 0x03
R/W
NLCDE1
NLCDE0
CODES
RXRES1
RXRES0
INSBPV
Reserved
TRATIO
4
00100
Hex 0x04
R/W
GIE
DMOIE
FLSIE
LCVIE
NLCDIE
AISDIE
RLOSIE
QRPDIE
5
00101
Hex 0x05
RO
Reserved
DMO
FLS
LCV
NLCD
AISD
RLOS
QRPD
6
00110
Hex 0x06
RUR
Reserved
DMOIS
FLSIS
LCVIS
NLCDIS
AISDIS
RLOSIS
QRPDIS
7
00111
Hex 0x07
RO
Reserved
Reserved
CLOS5
CLOS4
CLOS3
CLOS2
CLOS1
CLOS0
8
01000
Hex 0x08
R/W
X
B6S1
B5S1
B4S1
B3S1
B2S1
B1S1
B0S1
9
01001
Hex 0x09
R/W
X
B6S2
B5S2
B4S2
B3S2
B2S2
B1S2
B0S2
10
01010
Hex 0x0A
R/W
X
B6S3
B5S3
B4S3
B3S3
B2S3
B1S3
B0S3
11
01011
Hex 0x0B
R/W
X
B6S4
B5S4
B4S4
B3S4
B2S4
B1S4
B0S4
12
01100
Hex 0x0C
R/W
X
B6S5
B5S5
B4S5
B3S5
B2S5
B1S5
B0S5
13
01101
Hex 0x0D
R/W
X
B6S6
B5S6
B4S6
B3S6
B2S6
B1S6
B0S6
14
01110
Hex 0x0E
R/W
X
B6S7
B5S7
B4S7
B3S7
B2S7
B1S7
B0S7
43
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 17: MICROPROCESSOR REGISTER BIT MAP
REG.
TYPE
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
01111
Hex 0x0F
R/W
X
B6S8
B5S8
B4S8
B3S8
B2S8
B1S8
B0S8
10000
R/W
SR/DR
ATAOS
RCLKE
TCLKE
DATAP
Reserved
Reserved
SRESET
R/W
Reserved
CLKSEL2
CLKSEL1
CLKSEL0
MCLKRATE
RXMUTE
EXLOS
ICT
R/W
GAUGE1
GAUGE0
TXONCNTL
TERCNTL
SL_1
SL_0
EQG_1
EQG_0
Reset = 0
Reset = 0
Reset = 0
Reset = 0
Reset = 0
Reset = 0
Reset = 0 Reset = 0
R/W
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved Reserved
R/W
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved Reserved
R/W
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved Reserved
R/W
Test byte 0
R/W
Test byte 1
R/W
Test byte 2
R/W
Test byte 3
R/W
Test byte 4
R/W
Test byte 5
R/W
Test byte 6
R/W
Test byte 7
REG. #
ADDRESS
15
16
Hex 0x10
17
10001
Hex 0x11
18
10010
Hex 0x12
Unused Registers
19
10011
Hex 0x13
20
10100
Hex 0x14
21
10101
Hex 0x15
Test Registers
22
10110
Hex 0x16
23
10111
Hex 0x17
24
11000
Hex 0x18
25
11001
Hex 0x19
26
11010
Hex 0x1A
27
11011
Hex 0x1B
28
11100
Hex 0x1C
29
11101
Hex 0x1D
ID Registers
30
11110
DEVICE ID ⇒ F9
Hex 0x1E
31
11111
DEVICE "Revision ID"
Hex 0x1F
44
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 18: MICROPROCESSOR REGISTER #0 BIT DESCRIPTION
REGISTER ADDRESS
00000
FUNCTION
REGISTER RESET
TYPE
VALUE
BIT #
NAME
D7
Reserved
R/W
0
D6
Reserved
R/W
0
D5
Reserved
R/W
0
D4
EQC4
R/W
0
Equalizer Control bit 4: This bit together with EQC[3:0] are
used for controlling transmit pulse shaping, transmit line build-out
(LBO), receive monitoring and also T1 or E1 mode of operation.
See Table 5 for description of Equalizer Control bits.
D3
EQC3
Equalizer Control bit 3: See bit D4 description for function of
this bit
R/W
0
D2
EQC2
Equalizer Control bit 2: See bit D4 description for function of
this bit
R/W
0
D1
EQC1
Equalizer Control bit 1: See bit D4 description for function of
this bit
R/W
0
D0
EQC0
Equalizer Control bit 0: See bit D4 description for function of
this bit
R/W
0
45
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 19: MICROPROCESSOR REGISTER #1 BIT DESCRIPTION
REGISTER ADDRESS
00001
BIT #
NAME
D7
RXTSEL
D6
D5
REGISTER RESET
TYPE
VALUE
FUNCTION
TXTSEL
TERSEL1
Receiver Termination Select: In Host mode, this bit is used to
select between the internal and external line termination modes
for the receiver according to the following table:
RXTSEL
RX Termination
0
External
1
Internal
Transmit Termination Select: In Host mode, this bit is used to
select between the internal and external line termination modes
for the transmitter according to the following table:
TXTSEL
TX Termination
0
External
1
Internal
Termination Impedance Select bit 1:
In the Host mode and in the internal termination mode (TXTSEL=”1” and RXTSEL=”1”), TERSEL[1:0] control the transmit
and receive termination impedance according to the following
table:
TERSEL1
TERSEL0
Termination
0
0
100Ω
0
1
110Ω
1
0
75Ω
1
1
120Ω
R/W
0
R/W
0
R/W
0
R/W
0
In the internal termination mode, the receiver termination of each
receiver is realized completely by internal resistors or by the
combination of internal and one fixed resistor (see description for
RXRES[1:0] bits).
In the internal termination mode, the transmitter output should be
AC coupled to the transformer.
D4
TERSEL0
Termination Impedance Select bit 0:
See description of bit D5 for the function of this bit.
46
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 19: MICROPROCESSOR REGISTER #1 BIT DESCRIPTION
D3
JASEL1
Jitter Attenuator select bit 1: The JASEL1 and JASEL0 bits are
used to disable or place the jitter attenuator in the transmit or
receive path.
JASEL1
bit D3
JASEL0
bit D2
0
0
JA Disabled
0
1
JA in Transmit Path
1
0
JA in Receive Path
1
1
JA in Receive Path
R/W
0
JA Path
D2
JASEL0
Jitter Attenuator select bit 0: See description of bit D3 for the
function of this bit.
R/W
0
D1
JABW
Jitter Attenuator Bandwidth Select:
In E1 mode, set this bit to "1" to select a 1.5Hz Bandwidth for the
Jitter Attenuator In E1 mode. The FIFO length will be automatically set to 64 bits.
R/W
0
R/W
0
Set this bit to "0" to select 10Hz Bandwidth for the Jitter Attenuator in E1 mode.
In T1 mode the Jitter Attenuator Bandwidth is permanently set to
3Hz, and the state of this bit has no effect on the Bandwidth.
D0
FIFOS
Mode
JABW
bit D1
FIFOS_n
bit D0
JA B-W
Hz
FIFO
Size
T1
0
0
3
32
T1
0
1
3
64
T1
1
0
3
32
T1
1
1
3
64
E1
0
0
10
32
E1
0
1
10
64
E1
1
0
1.5
64
E1
1
1
1.5
64
FIFO Size Select: See table of bit D1 above for the function of
this bit.
47
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 20: MICROPROCESSOR REGISTER #2 BIT DESCRIPTION
REGISTER ADDRESS
00010
REGISTER RESET
TYPE
VALUE
FUNCTION
BIT #
NAME
D7
RXON
D6
TXTEST2
Receiver ON: Writing a “1” into this bit location turns on the
Receive Section. Writing a “0” shuts off the Receiver Section. In
this mode, RTIP and RRING driver outputs will be tri-stated for
power reduction or redundancy applications. Default is "0", off.
R/W
0
Transmit Test Pattern bit 2: This bit together with TXTEST1
and TXTEST0 are used to generate and transmit test patterns
according to the following table:
R/W
0
TXTEST2 TXTEST1 TXTEST0
Test Pattern
0
0
0
Transmit Data
0
0
1
TAOS
0
1
0
TLUC
0
1
1
TLDC
1
0
0
TDQRSS
1
0
1
TDQRSS & INVQRSS
1
1
0
TDQRSS & INSBER
1
1
1
TDQRSS & INVQRSS & INS
TDQRSS (Transmit/Detect Quasi-Random Signal): This condition, when activated, enables Quasi-Random Signal Source
generation and detection. In a T1 system QRSS pattern is a 2201 pseudo-random bit sequence (PRBS) with no more than 14
consecutive zeros. In a E1 system, QRSS is a 215-1 PRBS pattern.
TAOS (Transmit All Ones): Activating this condition enables the
transmission of an All Ones Pattern. TCLK must not be tied
"Low".
TLUC (Transmit Network Loop-Up Code): Activating this condition enables the Network Loop-Up Code of "00001" to be transmitted to the line. When Network Loop-Up code is being
transmitted, the XRT83L30 will ignore the Automatic Loop-Code
detection and Remote Loop-Back activation (NLCDE1 =“1”,
NLCDE0 =“1”, if activated) in order to avoid activating Remote
Digital Loop-Back automatically when the remote terminal
responds to the Loop-Back request.
TLDC (Transmit Network LOOP-Down Code): Activating this
condition enables the network Loop-Down Code of "001" to be
transmitted to the line.
D5
TXTEST1
Transmit Test pattern bit 1: See description of bit D6 for the
function of this bit.
R/W
0
D4
TXTEST0
Transmit Test Pattern bit 0: See description of bit D6 for the
function of this bit.
R/W
0
48
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 20: MICROPROCESSOR REGISTER #2 BIT DESCRIPTION
D3
TXON
Transmitter ON: Writing a "1" into this bit location turns on the
Transmit Section. A ‘0’ in this bit location, shuts off the transmitter. In this mode the TTIP and TRING driver outputs will be tristated for power reduction or redundancy applications.
R/W
0
D2
LOOP2
Loop-Back control bit 2: This bit together with the LOOP1 and
LOOP0 bits control the Loop-Back modes of the chip according
to the following table:
R/W
0
LOOP2
LOOP1
LOOP0
Loop-Back Mode
0
X
X
No Loop-Back
1
0
0
Dual Loop-Back
1
0
1
Analog Loop-Back
1
1
0
Remote Loop-Back
1
1
1
Digital Loop-Back
D1
LOOP1
Loop-Back control bit 1: See description of bit D2 for the function of this bit.
R/W
0
D0
LOOP0
Loop-Back control bit 0: See description of bit D2 for the function of this bit.
R/W
0
49
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 21: MICROPROCESSOR REGISTER #3 BIT DESCRIPTION
REGISTER ADDRESS
00011
REGISTER RESET
TYPE
VALUE
FUNCTION
BIT #
NAME
D7
NLCDE1
Network Loop Code Detection Enable bit 1:
This bit together with NLCDE0, Control the Loop-Code detection
according to the following table:
NLCDE1
NLCDE0
Function
0
0
Disable Loop-Code
Detection
0
1
Detect Loop-Up Code in
Receive Data
1
0
Detect Loop-Down Code in
Receive Data
1
1
Automatic Loop-Code
Detection
R/W
R/W
0
0
When NLCDE1=”0” and NCLDE0=”1”, or NLCDE1=”1” and
NLCDE0=”0”, the chip is manually programed to monitor the
receive data for the Loop-Up or Loop-Down code respectively.
When the presence of the “00001” or “001” pattern is detected for
more than 5 seconds, the status of the NLCD bit is set to “1” and
if the NLCD interrupt is enabled an interrupt is initiated. The Host
has the option to control the Loop-Back function manually.
Setting the NLCDE1=”1” and NLCDE0=”1” enables the Automatic Loop-Code detection and Remote-Loop-Back activation
mode. As this mode is initiated, the state of the NLCD interface
bit is reset to “0” and the chip is programmed to monitor the
receive data for the Loop-Up Code. If the “00001” pattern is
detected for longer than 5 seconds, the NLCD bit is set to “1”,
Remote Loop-Back is activated and the chip is automatically programed to monitor the receive data for the Loop-Down code. The
NLCD bit stays set even after the chip stops receiving the LoopUp code. The remote Loop-Back condition is removed when the
chip receives the Loop-Down code for more than 5 seconds or if
the Automatic Loop-Code detection mode is terminated.
D6
NLCDE0
Network Loop Code Detection Enable bit 0: See description
of bit D7 for the function of this bit.
R/W
0
D5
CODES
ENCODING and DECODING SELECT:
Writing a “0” to this bit selects HDB3 or B8ZS encoding and
decoding. Writing a “1” selects an AMI coding scheme.This bit is
only active when single-rail mode is selected.
R/W
0
50
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 21: MICROPROCESSOR REGISTER #3 BIT DESCRIPTION
D4
RXRES1
Receive External Resistor Control pin 1: In Host mode, this
bit along with the RXRES0 bit selects the value of the external
Receive fixed resistor according to the following table:
RXRES1 RXRES0
R/W
0
Required Fixed External
RX Resistor
0
0
No External Fixed Resistor
0
1
60Ω
1
0
52.5Ω
1
1
37.5Ω
D3
RXRES0
Receive External Resistor Control bit 0: For function of this bit
see description of D4 the RXRES1 bit.
R/W
0
D2
INSBPV
Insert Bipolar Violation: When this bit transitions from "0" to
"1", a bipolar violation is inserted in the transmitted data stream.
Bipolar violation can be inserted either in the QRSS pattern, or
input data when operating in single-rail mode. The state of this bit
is sampled on the rising edge of TCLK.
R/W
0
R/W
0
R/W
0
NOTE: To ensure the insertion of a bipolar violation, a "0" should
be written in this bit location before writing a "1".
D1
Reserved
D0
TRATIO
Transformer Ratio Select: In the external termination mode,
writing a “1” to this bit selects a transformer ratio of 1:2 for the
transmitter. Writing a “0” sets the transmitter transformer ratio to
1: 2.45. In the internal termination mode the transmitter transformer ratio is permanently set to 1:2 and the state of this bit has
no effect.
51
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 22: MICROPROCESSOR REGISTER #4 BIT DESCRIPTION
REGISTER ADDRESS
00100
FUNCTION
BIT #
NAME
D7
GIE
D6
REGISTER RESET
TYPE
VALUE
Global Interrupt Enable: Writing a "1" into this bit, globally
enables interrupt generation on the INT pin. Writing a "0" into this
bit, globally masks all interrupt requests.
R/W
0
DMOIE
DMO Interrupt Enable: Writing a "1" to this bit enables DMO
interrupt generation, writing a "0" masks it.
R/W
0
D5
FLSIE
FIFO Limit Status Interrupt Enable: Writing a "1" to this bit
enables interrupt generation when the FIFO limit is within 3 bits,
writing a "0" to masks it.
R/W
0
D4
LCVIE
Line Code Violation Interrupt Enable: Writing a "1" to this bit
enables Line Code Violation interrupt generation, writing a "0"
masks it.
R/W
0
D3
NLCDIE
Network Loop-Code Detection Interrupt Enable: Writing a "1"
to this bit enables Network Loop-code detection interrupt generation, writing a "0" masks it.
R/W
0
D2
AISDIE
AIS Detection Interrupt Enable: Writing a "1" to this bit enables
Alarm Indication Signal detection interrupt generation, writing a
"0" masks it.
R/W
0
D1
RLOSIE
Receive Loss of Signal Interrupt Enable: Writing a "1" to this
bit enables Loss of Receive Signal interrupt generation, writing a
"0" masks it.
R/W
0
D0
QRPDIE
QRSS Pattern Detection Interrupt Enable: Writing a "1" to this
bit enables QRSS pattern detection interrupt generation, writing
a "0" masks it.
R/W
0
52
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 23: MICROPROCESSOR REGISTER #5 BIT DESCRIPTION
REGISTER ADDRESS
00101
FUNCTION
BIT #
NAME
D7
Reserved
D6
DMO
D5
D4
REGISTER RESET
TYPE
VALUE
RO
0
Driver Monitor Output: This bit is set to a "1" to indicate transmit driver failure is detected. The value of this bit is based on the
current status of DMO. If the DMOIE bit is enabled, any transition
on this bit will generate an Interrupt.
RO
0
FLS
FiFO Limit Status: This bit is set to a "1" to indicate that the jitter
attenuator read/write FIFO pointers are within +/- 3 bits. If the
FLSIE bit is enabled, any transition on this bit will generate an
Interrupt.
RO
0
LCV
Line Code Violation: This bit is set to a "1" to indicate that the
receiver is currently detecting a Line Code Violation or an excessive number of zeros in the B8ZS or HDB3 modes. If the LCVIE
bit is enabled, any transition on this bit will generate an Interrupt.
RO
0
53
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 23: MICROPROCESSOR REGISTER #5 BIT DESCRIPTION
D3
NLCD
Network Loop-Code Detection:
This bit operates differently in the Manual or the Automatic Network Loop-Code detection modes.
RO
0
In the Manual Loop-Code detection mode (NLCDE1 =”0” and
NLCDE0 =”1”, or NLCDE1 =”1” and NLCDE0 =”0”) this bit gets
set to “1” as soon as the Loop-Up (“00001”) or Loop-Down
(“001”) code is detected in the receive data for longer than 5 seconds. The NLCD bit stays in the “1” state for as long as the chip
detects the presence of the Loop-Code in the receive data and it
is reset to “0” as soon as it stops receiving it. In this mode if the
NLCD interrupt is enabled the chip will initiate an interrupt on
every transition of the NLCD.
When the Automatic Loop-Code detection mode (NLCDE1 =”1”
and NLCDE0 =”1”) is initiated, the state of the NLCD interface bit
is reset to “0” and the chip is programmed to monitor the receive
input data for the Loop-Up Code. This bit is set to a “1” to indicate
that the Network Loop Code is detected for more than 5 seconds. Simultaneously the Remote Loop-Back condition is automatically activated and the chip is programmed to monitor the
receive data for the Network Loop-Down Code. The NLCD bit
stays in the “1” state for as long as the Remote Loop-Back condition is in effect even if the chip stops receiving the Loop-Up
Code. Remote Loop-Back is removed if the chip detects the
“001” pattern for longer than 5 seconds in the receive data.
Detecting the “001” pattern also results in resetting the NLCD
interface bit and initiating an interrupt provided the NLCD interrupt enable bit it active. When programmed in the Automatic
detection mode, the NLCD interface bit stays “High” for the entire
time the Remote Loop-Back is active and initiates an interrupt
anytime the status of the NLCD bit changes. In this mode the
host can monitor the state of the NLCD bit to determine if the
Remote Loop-Back is activated.
D2
AISD
Alarm Indication Signal Detect: This bit is set to a "1" to indicate All Ones Signal is detected by the receiver. The value of this
bit is based on the current status of Alarm Indication Signal
detector. If the AISDIE bit is enabled, any transition on this bit will
generate an Interrupt.
RO
0
D1
RLOS
Receive Loss of Signal: This bit is set to a "1" to indicate that
the receive input signal is lost. The value of this bit is based on
the current status of the receive input signal. If the RLOSIE bit is
enabled, any transition on this bit will generate an Interrupt.
RO
0
D0
QRPD
Quasi-random Pattern Detection: This bit is set to a "1" to indicate the receiver is currently in synchronization with QRSS pattern. The value of this bit is based on the current status of Quasirandom pattern detector of. If the QRPDIE bit is enabled, any
transition on this bit will generate an Interrupt.
RO
0
54
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 24: MICROPROCESSOR REGISTER #6 BIT DESCRIPTION
REGISTER ADDRESS
00110
FUNCTION
BIT #
NAME
D7
Reserved
D6
DMOIS
D5
REGISTER RESET
TYPE
VALUE
RUR
0
Driver Monitor Output Interrupt Status: This bit is set to a "1"
every time when DMO status has changed since last read.
RUR
0
FLSIS
FIFO Limit Interrupt Status: This bit is set to a "1" every time
when FIFO Limit (Read/Write pointer with +/- 3 bits apart) status
has changed since last read.
RUR
0
D4
LCVIS
Line Code Violation Interrupt Status: This bit is set to a "1"
every time when LCV status has changed since last read.
RUR
0
D3
NLCDIS
Network Loop-Code Detection Interrupt Status: This bit is set
to a "1" every time when NLCD status has changed since last
read.
RUR
0
D2
AISDIS
AIS Detection Interrupt Status: This bit is set to a "1" every
time when AISD status has changed since last read.
RUR
0
D1
RLOSIS
Receive Loss of Signal Interrupt Status: This bit is set to a "1"
every time RLOS status has changed since last read.
RUR
0
D0
QRPDIS
Quasi-Random Pattern Detection Interrupt Status: This bit is
set to a "1" every time when QRPD status has changed since
last read.
RUR
0
55
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 25: MICROPROCESSOR REGISTER #7 BIT DESCRIPTION
REGISTER ADDRESS
00111
FUNCTION
REGISTER RESET
TYPE
VALUE
BIT #
NAME
D7
Reserved
RO
0
D6
Reserved
RO
0
D5
CLOS5
Cable Loss bit 5: CLOS[5:0] are the six bits receiver for selective equalizer setting which is also a binary word that represents
the cable attenuation indication within ±1dB. CLOS5 is the most
significant bit (MSB) and CLOS0 is the least significant bit (LSB).
RO
0
D4
CLOS4
Cable Loss bit 4: See description of D5 for function of this bit.
RO
0
D3
CLOS3
Cable Loss bit 3: See description of D5 for function of this bit.
RO
0
D2
CLOS2
Cable Loss bit 2: See description of D5 for function of this bit.
RO
0
D1
CLOS1
Cable Loss bit 1: See description of D5 for function of this bit.
RO
0
D0
CLOS0
Cable Loss bit 0: See description of D5 for function of this bit.
RO
0
TABLE 26: MICROPROCESSOR REGISTER #8 BIT DESCRIPTION
REGISTER ADDRESS
01000
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S1 - B0S1 Arbitrary Transmit Pulse Shape, Segment 1
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the first time segment. B6S1 -B0S1 is in signed magnitude format with B6S1 as the sign bit and B0S1 as the least significant bit (LSB).
56
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 27: MICROPROCESSOR REGISTER #9 BIT DESCRIPTION
REGISTER ADDRESS
01001
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S2 - B0S2 Arbitrary Transmit Pulse Shape, Segment 2
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the second time segment. B6S2 -B0S2 is in signed magnitude format with B6S2 as the sign bit and B0S2 as the least
significant bit (LSB).
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
TABLE 28: MICROPROCESSOR REGISTER #10 BIT DESCRIPTION
REGISTER ADDRESS
01010
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S3 - B0S3 Arbitrary Transmit Pulse Shape, Segment 3
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the thrd time segment. B6S3 -B0S3 is in signed magnitude format with B6S3 as the sign bit and B0S3 as the least significant bit (LSB).
57
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 29: MICROPROCESSOR REGISTER #11 BIT DESCRIPTION
REGISTER ADDRESS
01011
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S4 - B0S4 Arbitrary Transmit Pulse Shape, Segment 4
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the fourth time segment. B6S4 -B0S4 is in signed magnitude format with B6S4 as the sign bit and B0S4 as the least significant bit (LSB).
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
TABLE 30: MICROPROCESSOR REGISTER #12 BIT DESCRIPTION
REGISTER ADDRESS
01100
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S5 - B0S5 Arbitrary Transmit Pulse Shape, Segment 5
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the fith time segment. B6S5 -B0S5 is in signed magnitude format with B6S5 as the sign bit and B0S5 as the least significant bit (LSB).
58
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 31: MICROPROCESSOR REGISTER #13 BIT DESCRIPTION
REGISTER ADDRESS
01101
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S6 - B0S6 Arbitrary Transmit Pulse Shape, Segment 6
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the sixth time segment. B6S6 -B0S6 is in signed magnitude format with B6S6 as the sign bit and B0S6 as the least significant bit (LSB).
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
TABLE 32: MICROPROCESSOR REGISTER #14 BIT DESCRIPTION
REGISTER ADDRESS
01110
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S7 - B0S7 Arbitrary Transmit Pulse Shape, Segment 7
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the seventh time segment. B6S7 -B0S7 is in signed magnitude format with B6S7 as the sign bit and B0S7 as the least
significant bit (LSB).
59
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 33: MICROPROCESSOR REGISTER #15 BIT DESCRIPTION
REGISTER ADDRESS
01111
FUNCTION
BIT #
NAME
D7
Reserved
D6-D0
B6S8 - B0S8 Arbitrary Transmit Pulse Shape, Segment 8
The shape of the transmitted pulse can be made user programmable by selecting "Arbitrary Pulse" mode, see Table 5. The
arbitrary pulse is divided into eight time segments whose combined duration is equal to one period of MCLK.
This 7 bit number represents the amplitude of the arbitrary pulse
during the eighth time segment. B6S8 -B0S8 is in signed magnitude format with B6S8 as the sign bit and B0S8 as the least significant bit (LSB).
60
REGISTER RESET
TYPE
VALUE
R/W
0
R/W
0
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 34: MICROPROCESSOR REGISTER #16 BIT DESCRIPTION
REGISTER ADDRESS
10000
NAME
FUNCTION
REGISTER RESET
TYPE
VALUE
BIT #
D7
SR/DR
Single-rail/Dual-rail Select: Writing a "1" to this bit configures
the XRT83L30 to operate in the Single-rail mode.
Writing a "0" configures the XRT83L30 to operate in Dual-rail
mode.
R/W
0
D6
ATAOS
Automatic Transmit All Ones Upon RLOS: Writing a "1" to this
bit enables the automatic transmission of All Ones data to the
line.
Writing a "0" disables this feature.
R/W
0
D5
RCLKE
Receive Clock Edge: Writing a "1" to this bit selects receive output data to be updated on the negative edge of RCLK.
Writing a "0" selects data to be updated on the positive edge of
RCLK.
R/W
0
D4
TCLKE
Transmit Clock Edge: Writing a "0" to this bit selects transmit
data at TPOS/TDATA and TNEG to be sampled on the falling
edge of TCLK.
Writing a "1" selects the rising edge of the TCLK for sampling.
R/W
0
D3
DATAP
DATA Polarity: Writing a "0" to this bit selects transmit input and
receive output data of the XRT83L30 to be active "High".
Writing a "1" selects an active "Low" state.
R/W
0
D2
Reserved
R/W
0
D1
Reserved
R/W
0
D0
SRESET
R/W
0
Software Reset µP Registers: Writing a "1" to this bit longer
than 10µs resets all internal state machines
61
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 35: MICROPROCESSOR REGISTER #17 BIT DESCRIPTION
REGISTER ADDRESS
10001
NAME
REGISTER RESET
TYPE
VALUE
FUNCTION
BIT #
D7
Reserved
D6
CLKSEL2
Clock Select Inputs for Master Clock Synthesizer bit 2: In
Host mode, CLKSEL[2:0] are input signals to a programmable
frequency synthesizer that can be used to generate a master
clock from an external accurate clock source according to the following table:
MCLKE1
kHz
M CLKT1
kHz
CLKSEL2
CLKSEL1
CLKSEL0
MCLKRATE
CLKOUT
kHz
2048
2048
0
0
0
0
2048
2048
2048
0
0
0
1
1544
2048
1544
0
0
0
0
2048
1544
1544
0
0
1
1
1544
1544
1544
0
0
1
0
2048
2048
1544
0
0
1
1
1544
8
X
0
1
0
0
2048
8
X
0
1
0
1
1544
16
X
0
1
1
0
2048
16
X
0
1
1
1
1544
56
X
1
0
0
0
2048
56
X
1
0
0
1
1544
64
X
1
0
1
0
2048
64
X
1
0
1
1
1544
128
X
1
1
0
0
2048
128
X
1
1
0
1
1544
256
X
1
1
1
0
2048
256
X
1
1
1
1
1544
R/W
0
R/W
0
In Hardware mode the state of these bits are ignored and the
master frequency PLL is controlled by the corresponding Hardware pins.
D5
CLKSEL1
Clock Select inputs for Master Clock Synthesizer bit 1: See
description of bit D6 for function of this bit.
R/W
0
D4
CLKSEL0
Clock Select inputs for Master Clock Synthesizer bit 0: See
description of bit D6 for function of this bit.
R/W
0
62
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 35: MICROPROCESSOR REGISTER #17 BIT DESCRIPTION
D3
MCLKRATE
D2
RXMUTE
Master Clock Rate Select: The state of this bit programs the
Master Clock Synthesizer to generate the T1/J1 or E1 clock. The
Master Clock Synthesizer will generate the E1 clock when
MCLKRATE = “0”, and the T1/J1 clock when MCLKRATE = “1”.
R/W
0
Receive Output Mute: Writing a "1" to this bit, mutes receive
outputs at RPOS/RDATA and RNEG/LCV pins to a "0" state.
R/W
0
NOTE: RCLK is not muted.
D1
EXLOS
Extended LOS: Writing a "1" to this bit extends the number of
zeros at the receive input before RLOS is declared to 4096 bits.
Writing a "0" reverts to the normal mode (175+75 bits for T1 and
32 bits for E1).
R/W
0
D0
ICT
In-Circuit-Testing: Writing a "1" to this bit configures all the output pins of the chip in "High" impedance mode for In-Circuit-Testing. Setting ICT bit to “1” is equivalent to connecting the
Hardware ICT pin to ground.
R/W
0
TABLE 36: MICROPROCESSOR REGISTER #18 BIT DESCRIPTION
REGISTER ADDRESS
10010
REGISTER
TYPE
RESET
VALUE
R/W
0
Wire Gauge Selector Bit 0
See bit D7.
R/W
0
Transmit On Control.
In Host mode, setting this bit to “1” transfers the control of the
Transmit On/Off function to the TXON Hardware control pin.
R/W
0
R/W
0
NAME
FUNCTION
GAUGE1
Wire Gauge Selector Bit 1
This bit along with bit D6 are used to select wire gauge size as
shown in the table below.
BIT #
D7
D6
GAUGE0
D5
TXONCNTL
GAUGE1
GAUGE0
Wire Size
0
0
22 and 24 Gauge
0
1
22 Gauge
1
0
24 Gauge
1
1
26 Gauge
NOTE: This provides a faster On/Off capability for redundancy
application.
D4
TERCNTL
Termination Control:
In Host mode, setting this bit to “1” transfers the control of the
RXTSEL to the RXTSEL Hardware control pin.
NOTE: This provides a faster On/Off capability for redundancy
application.
63
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 36: MICROPROCESSOR REGISTER #18 BIT DESCRIPTION
D3
SL_1
D2
SL_0
D1
EQG_1
D0
EQG_0
Slicer Level Control bit 1: This bit and bit D2 control the slicing level for the slicer per the following table.
R/W
0
Slicer Level Control bit 0: See description bit D3.
R/W
0
Equalizer Gain Control bit 1: This bit together with bit D0
control the gain of the equalizer as shown in the table below.
R/W
0
R/W
0
SL_1
SL_0
Slicer Mode
0
0
Normal
0
1
Decrease by 5% from Normal
1
0
Increase by 5% from Normal
1
1
Normal
EQG_1
EQG_0
Equalizer Gain
0
0
Normal
0
1
Reduce Gain by 1 dB
1
0
Reduce Gain by 3 dB
1
1
Normal
Equalizer Gain Control bit 0: See description of bit D1.
64
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
ELECTRICAL CHARACTERISTICS
TABLE 37: ABSOLUTE MAXIMUM RATINGS
Storage Temperature...............-65°C to +150°C
Operating Temperature............. -40°C to +85°C
Supply Voltage............................-0.5V to +3.8V
Vin................................................-0.5 to +5.5V
TABLE 38: DC DIGITAL INPUT AND OUTPUT ELECTRICAL CHARACTERISTICS
VDD=3.3V±5%, TA=25°C, UNLESS OTHERWISE SPECIFIED
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
VDD
3.13
3.3
3.46
V
Input High Voltage
VIH
2.0
-
5.0
V
Input Low Voltage
VIL
-0.5
-
0.8
V
Output High Voltage @ IOH = 2.0mA
VOH
2.4
-
-
V
Output Low Voltage @IOL = 2.0mA
VOL
-
-
0.4
V
Input Leakage Current (except Input pins
with Pull-up or Pull- down resistor).
IL
-
-
±10
µA
Input Capacitance
CI
-
5.0
-
pF
Output Load Capacitance
CL
-
-
25
pF
Power Supply Voltage
TABLE 39: XRT83L30 POWER CONSUMPTION
VDD=3.3V±5%, TA=25°C, INTERNAL IMPEDANCE, UNLESS OTHERWISE SPECIFIED
MODE
SUPPLY
VOLTAGE
IMPEDANCE
TERMINATION
TRANSFORMER
RATIO
RESISTOR
TYP
MAX
UNIT
TEST
CONDITIONS
RECEIVER TRANSMITTER
E1
3.3V
75Ω
Internal
1:1
1:2
298
350
mW
100% “1’s”
E1
3.3V
120Ω
Internal
1:1
1:2
276
325
mW
100% “1’s”
T1
3.3V
100Ω
Internal
1:1
1:2
310
365
mW
100% “1’s”
---
3.3V
---
External
---
---
72
85
mW
All transmitters off
65
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 40: E1 RECEIVER ELECTRICAL CHARACTERISTICS
VDD=3.3V±5%, TA= -40° TO 85°C, UNLESS OTHERWISE SPECIFIED
PARAMETER
MIN
TYP
MAX
Number of consecutive zeros before
RLOS is set
10
175
255
Input signal level at RLOS
15
UNIT
TEST CONDITIONS
Receiver loss of signal:
RLOS De-asserted
Receiver Sensitivity
(Short Haul with cable loss)
Receiver Sensitivity
(Long Haul with cable loss)
Nominal
Extended
Cable attenuation @1024KHz
dB
12.5
dB
11
dB
dB
0
0
36
43
ITU-G.775, ETSI 300 233
With nominal pulse amplitude of 3.0V
for 120Ω and 2.37V for 75Ω application. With -18dB interference signal
added.
With nominal pulse amplitude of 3.0V
for 120Ω and 2.37V for 75Ω application. With -18dB interference signal
added.
kΩ
13
Input Impedance
Input Jitter Tolerance:
1 Hz
10kHz-100kHz
20
>64
0.4
UIpp
UIpp
ITU G.823
kHz
dB
ITU G.736
Recovered Clock Jitter
Transfer Corner Frequency
Peaking Amplitude
-
Jitter Attenuator Corner Frequency (-3dB curve) (JABW=0)
(JABW=1)
-
10
1.5
-
Hz
Hz
ITU G.736
14
20
16
-
-
dB
dB
dB
ITU-G.703
Return Loss:
51kHz - 102kHz
102kHz - 2048kHz
2048kHz - 3072kHz
20
0.5
66
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 41: T1 RECEIVER ELECTRICAL CHARACTERISTICS
VDD=3.3V±5%, TA= -40° TO 85°C, UNLESS OTHERWISE SPECIFIED
PARAMETER
MIN
TYP
MAX
UNIT
TEST CONDITIONS
Receiver loss of signal:
Number of consecutive zeros before
RLOS is set
100
Input signal level at RLOS
15
175
250
Cable attenuation @772kHz
20
-
dB
ITU-G.775, ETSI 300 233
RLOS Clear
Receiver Sensitivity
(Short Haul with cable loss)
Receiver Sensitivity
(Long Haul with cable loss)
12.5
-
-
12
% ones
dB
0
36
dB
dB
Recovered Clock Jitter
Transfer Corner Frequency
Peaking Amplitude
Jitter Attenuator Corner Frequency
(-3dB curve)
Return Loss:
51kHz - 102kHz
102kHz - 2048kHz
2048kHz - 3072kHz
With nominal pulse amplitude of 3.0V
for 100Ω termination
13
-
kΩ
138
0.4
-
-
UIpp
AT&T Pub 62411
-
9.8
0.1
kHz
dB
TR-TSY-000499
-
3
Hz
AT&T Pub 62411
-
20
25
25
Input Impedance
Jitter Tolerance:
1Hz
10kHz - 100kHz
With nominal pulse amplitude of 3.0V
for 100Ω termination
-
dB
dB
dB
TABLE 42: E1 TRANSMIT RETURN LOSS REQUIREMENT
RETURN LOSS
FREQUENCY
G.703/CH-PTT
ETS 300166
51-102kHz
8dB
6dB
102-2048kHz
14dB
8dB
2048-3072kHz
10dB
8dB
67
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 43: E1 TRANSMITTER ELECTRICAL CHARACTERISTICS
VDD=3.3V±5%, TA= -40° TO 85°C, UNLESS OTHERWISE SPECIFIED
PARAMETER
MIN
TYP
MAX
UNIT
2.185
2.76
2.37
3.0
2.555
3.24
V
V
Output Pulse Width
224
244
264
ns
Output Pulse Width Ratio
0.95
-
1.05
-
ITU-G.703
Output Pulse Amplitude Ratio
0.95
-
1.05
-
ITU-G.703
-
0.025
0.05
UIpp
8
14
10
-
-
dB
dB
dB
AMI Output Pulse Amplitude:
75Ω Application
120Ω Application
Jitter Added by the Transmitter Output
Output Return Loss:
51kHz -102kHz
102kHz-2048kHz
2048kHz-3072kHz
TEST CONDITIONS
Transformer with 1:2 ratio and 9.1Ω
resistor in series with each end of primary.
Broad Band with jitter free TCLK
applied to the input.
ETSI 300 166, CHPTT
TABLE 44: T1 TRANSMITTER ELECTRICAL CHARACTERISTICS
VDD=3.3V±5%, TA= -40° TO 85°C, UNLESS OTHERWISE SPECIFIED
PARAMETER
MIN
TYP
MAX
UNIT
AMI Output Pulse Amplitude:
2.5
3.0
3.5
V
Tansformer with 1:2.45 ratio and measured at DSX-1
Output Pulse Width
338
350
362
ns
ANSI T1.102
Output Pulse Width Imbalance
-
-
20
-
ANSI T1.102
Output Pulse Amplitude Imbalance
-
-
+200
mV
ANSI T1.102
Jitter Added by the Transmitter Output
-
0.025
0.05
UIpp
-
15
15
15
-
dB
dB
dB
Output Return Loss:
51kHz -102kHz
102kHz-2048kHz
2048kHz-3072kHz
68
TEST CONDITIONS
Broad Band with jitter free TCLK
applied to the input.
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
FIGURE 26. ITU G.703 PULSE TEMPLATE
10%
20%
269 ns
(244 + 25)
194 ns
(244 – 50)
20%
10%
V = 100%
Nominal pulse
50%
20%
10%
0%
10%
10%
219 ns
(244 – 25)
10%
244 ns
488 ns
(244 + 244)
Note – V corresponds to the nominal peak value.
TABLE 45: TRANSMIT PULSE MASK SPECIFICATION
Test Load Impedance
75Ω Resistive (Coax)
120Ω Resistive (twisted Pair)
2.37V
3.0V
0 + 0.237V
0 + 0.3V
244ns
244ns
0.95 to 1.05
0.95 to 1.05
Nominal Peak Voltage of a Mark
Peak voltage of a Space (no Mark)
Nominal Pulse width
Ratio of Positive and Negative Pulses Imbalance
69
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
FIGURE 27. DSX-1 PULSE TEMPLATE (NORMALIZED AMPLITUDE)
TABLE 46: DSX1 INTERFACE ISOLATED PULSE MASK AND CORNER POINTS
MINIMUM CURVE
MAXIMUM CURVE
TIME (UI)
NORMALIZED AMPLITUDE
TIME (UI)
NORMALIZED AMPLITUDE
-0.77
-.05V
-0.77
.05V
-0.23
-.05V
-0.39
.05V
-0.23
0.5V
-0.27
.8V
-0.15
0.95V
-0.27
1.15V
0.0
0.95V
-0.12
1.15V
0.15
0.9V
0.0
1.05V
0.23
0.5V
0.27
1.05V
0.23
-0.45V
0.35
-0.07V
0.46
-0.45V
0.93
0.05V
0.66
-0.2V
1.16
0.05V
0.93
-0.05V
1.16
-0.05V
70
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TABLE 47: AC ELECTRICAL CHARACTERISTICS
(TA=25°C, VDD=3.3V±5%, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
E1 MCLK Clock Frequency
-
2.048
-
MHz
T1 MCLK Clock Frequency
-
1.544
-
MHz
MCLK Clock Duty Cycle
40
-
60
%
MCLK Clock Tolerance
-
±50
-
ppm
TCDU
30
50
70
%
Transmit Data Setup Time
TSU
50
-
-
ns
Transmit Data Hold Time
THO
30
-
-
ns
TCLK Rise Time(10%/90%)
TCLKR
-
-
40
ns
TCLK Fall Time(90%/10%)
TCLKF
-
-
40
ns
RCLK Duty Cycle
RCDU
45
50
55
%
Receive Data Setup Time
RSU
150
-
-
ns
Receive Data Hold Time
RHO
150
-
-
ns
RCLK to Data Delay
RDY
-
-
40
ns
RCLK Rise Time(10%/90%) with
25pF Loading.
RCLKR
-
-
40
ns
RCLK Fall Time(90%/10%) with 25pF
Loading.
RCLKF
40
ns
TCLK Duty Cycle
FIGURE 28. TRANSMIT CLOCK AND INPUT DATA TIMING
TCLKR
TCLK
TPOS/TDATA
or
TNEG
TSU
THO
71
TCLKF
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
FIGURE 29. RECEIVE CLOCK AND OUTPUT DATA TIMING
RCLKR
RDY
RCLK
RPOS
or
RNEG
RHO
72
RCLKF
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PACKAGE DIMENSIONS
64 LEAD THIN QUAD FLAT PACK
(10 X 10 X 1.4 MM TQFP)
REV. 3.00
D
D1
48
33
49
32
D1
64
D
17
1
16
B
A2
e
C
A
α
Seating Plane
A1
L
Note: The control dimension is the millimeter column
INCHES
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
A
0.055
0.063
1.40
1.60
A1
0.002
0.006
0.05
0.15
A2
0.053
0.057
1.35
1.45
B
0.007
0.011
0.17
0.27
C
0.004
0.008
0.09
0.20
D
0.465
0.480
11.80
12.20
D1
0.390
0.398
9.90
10.10
e
0.020 BSC
0.50 BSC
L
0.018
0.030
0.45
0.75
α
0°
7°
0°
7°
73
REV. 1.0.1
XRT83L30
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
ORDERING INFORMATION
TABLE 48.
PART #
PACKAGE
OPERATING TEMPERATURE RANGE
XRT83L30IV
64 Pin TQFP
-40oC to +85oC
THERMAL INFORMATION
Theta - JA = 38° C/W
Theta JC = 7° C/W
REVISION HISTORY
Rev. A1.0.0 Advanced version.
Rev. P1.1.0 Preliminary release.
Rev. P1.2.0 Modified microprocessor tables, moved various functions. Added GHCI_n, SL_1, SL_0, EQG_1
EQG_0, GAUGE1 and GAUGE0 to Control Global Register 18. Separated Microprocessor description table by
register number. Moved absolute maximum and DC electrical characteristics before AC electrical
characteristics. Replaced TBD’s in electrical ables. Reformated table of contents.
Rev. P1.2.1 Renamed FIFO pin to GAUGE, edited definition and edited defintion of JASEL[1:0] to reflect the
FIFO size is selected by the jitter attenuator select.
Rev. P1.2.2 Redefined bits D3, D2 and D0 of register 1, in combination these bits set the jitter attenuator path
and FIFO size.
Rev. P1.2.3 Added definitions to dual function pins in the pin description section.
Rev P1.2.4 Added JABW, JASEL1 and JASEL0 table in pin list and Jitter attenuator section. Corrected typos in
features, figures 7, 8, 9 and 11. Added Jitter attenuator tables in microprocessor register tables.
Rev. P1.2.5 Table 18, 23, 24, 25 change GCHIE to GIE, GHCI and GCHIS to Reserved. Corrected package
outline drawing.
Rev. P1.2.6 TERCNTL (pin 46) function removed. Bit 7 of Microprocessor Register #2 was INSBER, is now
reserved. Bit 1 of Microprocessor Register #3 was INVQRSS, is now reserved. New description for bits D6 D0 in Tables 27 - 34 Microprocessor Registers.
Rev. P1.2.7 Expanded information on Receive Redundancy. 2 tables and 1 figure.
Rev. P1.2.8 Edited section on RLOS
Rev. P1.2.9 Removed TERCNTL from block diagram. Edit EQC[4:0] to be input only on block diagram.
Corrected RXMUTE, TCLK, JABW, MCKLE1, CLKSEL [2:0], RXTSEL, TERSEL[1:0], RXRES[1:0], ATAOS,
NLCD in the pin descriptions section. Replaced the Functional Description section. Edits to Table 18:
Microprocessor Register Bit Map, Table 21: Microprocessor Register #2 Bit Description, Table 35:
Microprocessor Register #16 Bit Description
Rev. P1.3.0 Table 35: Microprocessor Register #17 Bit Description, edit E1 clock MCLKRATE= “0” and T1/J1
clock MCLKRATE=”1” .
Rev. 1.0.0 Final Release.
Rev. 1.0.1 Corrected package dimensions in ordering information table page 3.
74
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
NOTES
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specific application. While the information in this publication
has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless
EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has
been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately
protected under the circumstances.
Copyright 2006 EXAR Corporation
Datasheet June 2006.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
75
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