Interface Physical Characteristics. Conner CFP2105S, CFP2105 series, CFP2105E, CFP2105W

Interface Physical Characteristics

5

Electrical Description

The paragraphs which follow describe the input and output electrical characteristics of the drive.

Output Characteristics

The output drivers for Data, Parity, REQ and ACK are optionally active negation. When they are set for active negation, they have three states: asserted, negated and high impedance. The remainder of the signals have open collector (drain) outputs. The drivers maintain a high impedance state during power-on and power-off cycles. The driven signals have the following output characteristics when measured at the drive connector:

Table 5-1

Active Negation Driver Output Signal Characteristics

Signal Characteristic

Signal Assertion

Minimum Driver Output Capability

Signal Negation

Value

0.1 VDC to 0.5 VDC at 48 mA

48 mA (sinking) at 0.5 VDC


3.0 VDC at 20 mA

Table 5-2

Open Collector Driver Output Signal Characteristics


Signal Assertion

Minimum Driver Output Capability

Signal Negation

Value


48 mA (sinking) at 0.5 VDC

2.5 VDC to 5.25 VDC

Technical Reference Manual Page 53

Chapter 5 SCSI Physical Characteristics

Input Characteristics

The characteristics of the input receivers and the requirements for each signal received by the drive as measured at the drive connector are shown in table 5-3:

Table 5-3

Drive Input Signal Characteristics


Signal Assertion

Signal Negation

Input Load (low level)

Input Load (high level)

Value

0.0 VDC to 0.8 VDC

2.0 VDC to 5.25 VDC

-20

µ

A to 0.0 mA at 0.5 VDC

0.0 mA to 20

µ

A at 2.7 VDC

Model-Specific SCSI Physical Characteristics

The sections which follow describe, for each of the drive models, those SCSI characteristics which vary from model to model. These characteristics include:

•

Termination

•

Cable requirements

•

Connector requirements

•

Connector Pin assignments

•

Interface Timing requirements

Page 54 Filepro CFP2105 Series

SCSI Physical Characteristics Chapter 5

CFP2105E (WIDE, 80-pin Single Connector Attachment [SCA])

External Terminator Power

The interface connector carries both power and ground so a separate TERMPWR interface line is not provided.

Internal Termination

This version of the drive has no on-board termination so the drive must be externally terminated. Alternative 2 active termination is recommended.

Alternative 1 passive termination is not suitable for this application.

Cable Requirements

This version of the drive is designed to facilitate interfacing directly to a mating connector which is on a passive back plane or directly into a motherboard.

The design of the SCSI bus interconnect system should meet the following guidelines, particularly with FAST SCSI-2 systems:

•

Do not route the data signals next to any high frequency or large current switching signals. Unreliable drive operation can result from improper signal routing.

•

Signal line stubs should not exceed 0.1 meter (4 inches).

•

There should be 0.3 meters (12 inches) of transmission line between drives.

•

The total length of any signal line should not exceed 6 meters (20 feet) and may have to be reduced if excessive impedance discontinuities exist on the bus.

•

Maintain a minimum of 0.050 inches (1.27mm) gap between adjacent signal.runs to control crosstalk between signal lines.

•

Signals routed over a ground plane or between ground planes have different characteristic impedance. Signals with critical timing like REQ, ACK and

Data should be routed similarly.

The signal length between devices should either be spaced shorter than the stub length, which treats a group of devices as a lumped element, or far enough apart that a transmission line exists (0.3 meters or 12 inches). These signal length considerations should include the length of signal traces and connectors on the printed circuit board. The diagram below shows how it is possible to interconnect six 1-inch height drives over a relatively short length of interconnect.

3" [0.08m] maximum

12" [0.3m] minimum



Connector Requirements

The drive's connector will mate with a AMP Champ 2-557103-1 vertical receptacle or the AMP Champ 2-557101-1 right angle receptacle. A mating connector which is compatible with 0.025 inch (0.63 mm) centerline #30 AWG solid PVC insulation cabling is AMP Camp 1-557089-3. Refer to figure 2-1 for the location of the connector on the drive.

Single Connector Attachment (SCA) Signal Definitions

Power

Four +12 Volt signals provide the +12 volt power to the drive. The current return for the +12 volt power is through the +12 Volt Ground signals. The maximum current that can be provided to the drive through the +12 Volt signal pins is 3 Amperes. The supply current and return current must be distributed as evenly as possible among the pins. The maximum current is required while the drive motor is starting.

Three +5 Volt signal pins provide +5 volt power to the drive. The current return for the +5 volt power is through the +5 Volt Ground pins. It is expected that the

+5 Volt Ground will also establish the digital logic ground for the drive. The maximum current that can be provided to the drive through the +5 Volt signal pins is 2 Amperes. The supply current and return current must be distributed as evenly as possible among the pins.

These specifications refer to the connector's characteristics. Refer to Chapter 2 for the drive's power requirements.

Spindle Sync

The spindle rotation of up to 35 drives may be synchronized together by daisy chaining pin 1 to pin 1 and pin 2 to pin 2 of each drive on connector J3. The synchronization tolerance is 1%.

Table 5-4

Electrical Characteristics for the Spindle Sync Signal

STATE

High

Low

Current

0 < I

IH

< 20

µ

A

0 < I

OH

< -48 mA

Voltage

2.5 V < V

IH

< V

CC

-0.1 V < V

IL

+ 0.3 V

< 0.4 V



LED Out

The LED out signal is driven by the drive when the drive is performing a SCSI operation. The LED out signal is designed to pull down the cathode of an LED.

The anode is attached to the proper +5 volt supply through an appropriate current limiting resistor. The LED and the current limiting resistor are external to the drive.

Table 5-5

Output Characteristics of the LED Driver Signal

Output Voltage State

Drive LED Off

Drive LED On

Current Drive Available

0 < I

OH

< 100

µ

A

I

OL

< -30 mA 0 < V

OL

< 0.8 Volts

Motor Start Controls

Table 5-6

Electrical Characteristics for RMT_START and DLYD_START

State

Open

Ground

Current

0 < I

IH

< +100

µ

A

0 < I

OH

< -3 mA

Voltage

2.4 V < V

IH

< V

CC

+ 0.5 V

-0.5 V < V

IL

< 0.4 V

SCSI ID Selection

Table 5-7

Electrical Characteristics for the SCSI ID Signals SCSI ID (0) - (3)

State

Open

Ground

Current

0 < I

IH

< +100

µ

A

0 < I

OH

< -3 mA

Voltage

2.4 V < V

IH

< V

CC

+ 0.5 V

-0.5 V < V

IL

< 0.4 V



Interface Pin Assignments

The pin assignments for the interface connector are shown below:

Table 5-8

Interface Signal Definitions

Pin

29

30

31

32

25

26

27

28

21

22

23

24

17

18

19

20

37

38

39

40

33

34

35

36

13

14

15

16

9

10

11

12

7

8

5

6

3

4

1

2

Notes:

1. The minus sign (-) indicates active low.

2. Pins marked Reserved are not connected.

Signal

-ACK

-BSY

-ATN

-DB(P0)

-DB(7)

-DB(6)

-DB(5)

-DB(4)

-DB(3)

-DB(2)

-DB(1)

-DB(0)

-DB(P1)

-DB(15)

-DB(14)

-DB(13)

+12 Volt

+12 Volt

+12 Volt

+12 Volt

Reserved / NC

Reserved / NC

-DB(11)

-DB(10)

-DB(9)

-DB(8)

-I/O

-REQ

-C/D

-SEL

-MSG

-RST

-DB(12)

+5 Volt

+5 Volt

+5 Volt

SYNC

RMT_START

SCSI ID (0)

SCSI ID (2)

Pin

69

70

71

72

65

66

67

68

61

62

63

64

57

58

59

60

77

78

79

80

73

74

75

76

53

54

55

56

49

50

51

52

45

46

47

48

41

42

43

44

Signal

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

+12 Volt Ground

+12 Volt Ground

+12 Volt Ground

+12 Volt Ground

Reserved / NC

Reserved / NC

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

+5 Volt Ground

+5 Volt Ground

+5 Volt Ground

LED

DLYD_START

SCSI ID (1)

SCSI ID (3)



Interface Timing Requirements

Unless otherwise noted, the delay-time measurements are calculated from signal conditions existing at the drive's own SCSI bus connector. Normally these measurements (except cable skew delay) can be made without considering delays in the inter-connect system.

Table 5-9

SCSI Bus Timing Values

Timing Description

Arbitration Delay

Bus Clear Delay

Bus Free Delay

Bus Set Delay

Bus Settle Delay

Cable Skew Delay

1

Data Release Delay

Receive Assertion Period

Receive Hold Time

Receive Negation Period

Receive Setup Time

Reset Hold Time

Selection Abort Time

Selection Time-out Delay

2

System Deskew Delay

Transmit Assertion Period

Transmit Hold Time

Transmit Negation Period

Transmit Setup Time

fast

2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns

400 ns

22 ns

25 ns

22 ns

15 ns

25

µ s

200

µ s

250 ms

20 ns

30 ns

33 ns

30 ns

23 ns

Timing Value slow

2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns

400 ns

70 ns

25 ns

70 ns

15 ns

25

µ s

200

µ s

250 ms

45 ns

80 ns

53 ns

80 ns

23 ns

asynch

2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns

400 ns n/a n/a n/a n/a

25

µ s

200

µ s

250 ms


Notes:

1

This time does not apply at the SCSI connector of the drive.

2

This is a recommended time. It is not mandatory.



Model CFP2105S (Narrow, 50-pin SCSI)


Power to the on-board terminators is provided by the higher of the voltage supplied at Pin #26, J2 or the voltage level at the 5 Volt power input to the drive minus one diode drop. The diode prevents back flow of current to the drive.

Termination Power to external terminators can be supplied by the drive through

Pin #26, J2. The TERMPWR line can be disconnected from the drive by removing Jumper E8. Table 5-10 describes the electrical characteristics of the

TERMPWR line when it is used to supply power to an external terminator.

Table 5-11 describes the required electrical characteristics for any external source of termination power.

Table 5-10

TERMPWR Output Electrical Characteristics


Supply voltage

Minimum source capability:

Value

4.06 VDC to 4.56 VDC

800 mA (fused at 1000 mA)

Table 5-11

TERMPWR Input Electrical Characteristics


Input voltage


Sink current:

Value



1.0 mA maximum, excluding power to the internal terminator.


This drive provides on-board Alternative 2 active termination for the SCSI bus.

The termination resistors, which are contained in two Single Inline Packs (SIPs) should be removed from the drive unless it is a SCSI device at a physical end of the bus. The terminator equivalent circuit is shown below for reference:

Figure 5-1

Terminator Equivalent Circuit

+5V

TERMPWR

E8

F1

Voltage

Regulator

2.5K

10K

110

-DB0

-DB1

-DB2

: :

: :

: :

-REQ

-I/O




A 50 conductor cable no more than 6 meters (19.68 feet) cumulative length with at least 28 AWG wire size and a characteristic impedance of 70 to 100 ohms (84 ohms nominal) is required. In systems which use the fast synchronous transfer option, the cable should meet the following additional requirements:

Table 5-12

Interface Cable Electrical Characteristics

Specification

Signal Attenuation

Pair-to-Pair Propagation Delay Delta

DC Resistance

Value

0.095dB maximum per meter at 5 Mhz

0.20 ns maximum per meter

0.230 ohms maximum per meter at 20

°

C




The connector on the drive is a 50-position header which consists of 2 rows of 25 male pins on 0.100 inch centers. The mating connector is a SCSI-2 Non-shielded

Alternative 1, A-cable connector which is shown below:

Figure 5-2

A-Cable Connector

Contact 50

C1

Back view

C4

Contact 1

C3

C2

See Note 1

Contacts for even wires are not shown.

Side view

C5

C6

Socket 1

Socket 49

C7

Front view

C8

Socket 2

Socket 50

Dimensions Millimeters Inches

C5

C6

C7

C8

C1

C2

C3

C4

2.540

60.960

2.540

3.302

32.385

68.072

6.096

7.620

0.100

2.400

0.100

0.130

1.275

2.680

0.240

0.300

Notes:

(1) Fifty contacts on 1.27mm (0.05

inch) staggered spacing =

62.23mm (2.450 inch) [ref.]

(2) Tolerances +0.127mm (0.005

inch) noncumulative unless specified otherwise.

(3) Connector cover and strain relief are optional


SCSI Physical Characteristics



Pin

09

11

13

15

17

01

03

05

07

19

21

23

25

27

29

31

41

43

45

47

49

33

35

37

39

Table 5-13


Signal

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND

RESERVED

OPEN

RESERVED

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND

Pin

10

12

14

16

18

02

04

06

08

20

22

24

26

28

30

32

42

44

46

48

50

34

36

38

40

Signal

-DB0

-DB1

-DB2

-DB3

-DB4

-DB5

-DB6

-DB7

-DBP

GND

GND

RESERVED

TERMPWR

RESERVED

GND

-ATN

GND

-BSY

-ACK

-RST

-MSG

-SEL

-C/D

-REQ

-I/O

Notes:


2. All odd pins except pin 25 must be connected to ground. Pin 25 is left open.

3. Pins marked Reserved are connected to ground.

Chapter 5




Unless otherwise noted, the delay-time measurements are calculated from signal conditions existing at the drive's own SCSI bus connector. Normally these measurements (except cable skew delay) can be made without considering delays in the cable.

Table 5-14




Bus Clear Delay

Bus Free Delay

Bus Set Delay



1






Reset Hold Time



2






fast

2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns

400 ns

22 ns

25 ns

22 ns

15 ns

25

µ s

200

µ s

250 ms

20 ns

30 ns

33 ns

30 ns

23 ns


2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns

400 ns

70 ns

25 ns

70 ns

15 ns

25

µ s

200

µ s

250 ms

45 ns

80 ns

53 ns

80 ns

23 ns

asynch

2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns


25

µ s

200

µ s

250 ms


Notes:

1


2




Model CFP2105W (Wide, Unitized SCSI-3 P-Connector)


Power to the on-board terminators is provided by the higher of the voltage supplied at Pin #17, 18, 51, & 52, J2 or the voltage level at the 5 Volt power input to the drive minus one diode drop. The diode prevents back flow of current to the drive. Termination Power to external terminators can be supplied by the drive through Pin #17, 18, 51, & 52, J2. The TERMPWR line can be disconnected from the drive by removing Jumper E8. Table 5-11 describes the electrical characteristics of the TERMPWR line when it is used to supply power to an external terminator.

Table 5-15

TERMPWR Electrical Output Characteristics


Supply voltage


Value


(dependent on power supplied to the drive)

1500 mA

Table 5-16

TERMPWR Input Electrical Characteristics


Input voltage


Sink current:

Value



1.0 mA maximum, excluding power to the internal terminator.


This drive provides on-board Alternative 2 active termination for the SCSI bus.

The termination resistors, which are contained in three Single Inline Packs

(SIPs) should be removed from the drive unless it is a SCSI device at a physical end of the bus. The terminator equivalent circuit is shown below for reference:

Figure 5-2

Terminator Equivalent Circuit

+5V

TERMPWR

E8

F1

Voltage

Regulator

2.5K

10K

110

-DB0

-DB1

-DB2

: :

: :

: :

-REQ

-I/O



J5 Auxiliary Connector Signal Characteristics

Table 5-17

J5 Auxiliary Interface Electrical Characteristics

High

Low

State Current

0 < I

IH

< 20

µ

A

0 < I

OH

< -48 mA

Voltage

2.5 V < V

IH

< V

CC

+ 0.3 V

-0.1 V < V

IL

< 0.4 V


A 68 conductor cable no more than 3 meters (9.84 feet) cumulative length with at least 30 AWG wire size and a characteristic impedance of 70 to 100 ohms (84 ohms nominal) is required. In systems which use the fast synchronous transfer option, the cable should meet the following additional requirements:

Table 5-18

Interface Cable Electrical Characteristics

Specification

Signal Attenuation

Pair-to-Pair Propagation Delay Delta

DC Resistance

Value

0.095dB maximum per meter at 5 Mhz

0.20 ns maximum per meter

0.230 ohms maximum per meter at 20

°

C




The connector on the drive is a 68-pin . The mating connector is a SCSI 3 Nonshielded P-cable connector which is shown below:

Figure 5-4

P-Cable Connector

T

A13

A16 R

A8

A14 A15

A9

M

T V S W S

A10

A11

M T V S W S

PIN 1

A1

W

A12

PIN 68

A6

PIN 34

A3

A2

V

DIMENSIONS

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

A11

A12

A13

A14

Technical Reference Manual

PIN 35

A7

Millimeters

46.28

5.69

2.54

1.27

41.91

15°

1.04 R

0.396 + 0.010

0.23

0.60 + 0.03

0.23

0.05

5.15 + 0.15

4.39 MAX

A4

A5

Inches

1.822

0.224

0.100

0.050

1.650

15°

0.041 R

0.0156 + 0.0004

0.009

0.024 + 0.001

0.009

0.002

0.203 + 0.006

0.173 MAX

Page 67

Chapter 5

A15

A16

3.02 MIN

1.02 + 0.25

0.119 MIN

0.040 + 0.010






Table 5-19


Pin

21

22

23

24

25

17

18

19

20

26

27

28

29

30

31

32

33

34

7

8

9

5

6

3

4

1

2

10

11

12

13

14

15

16

Signal

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

Ground

TERMPWR

TERMPWR

Reserved

Ground

Ground

Notes:


2. Pins marked Reserved are not connected.

Pin

55

56

57

58

59

51

52

53

54

60

61

62

63

64

65

66

67

68

39

40

41

42

43

35

36

37

38

44

45

46

47

48

49

50

Signal

-DB(12)

-DB(13)

-DB(14)

-DB(15)

-DB(P1)

-DB(0)

-DB(1)

-DB(2)

-DB(3)

Ground

-BSY

-ACK

-RST

-MSG

-SEL

-C/D

-REQ

-I/O

-DB(8)

-DB(9)

-DB(10)

-DB(11)

-DB(4)

-DB(5)

-DB(6)

-DB(7)

-DB(P)

Ground

Ground

TERMPWR

TERMPWR

Reserved

Ground

--ATN

Chapter 5




Unless otherwise noted, the delay-time measurements are calculated from signal conditions existing at the drive's own SCSI bus connector. Normally these measurements (except cable skew delay) can be made without considering delays in the cable.

Table 5-20




Bus Clear Delay

Bus Free Delay

Bus Set Delay



1






Reset Hold Time



2






fast

2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns

400 ns

22 ns

25 ns

22 ns

15 ns

25

µ s

200

µ s

250 ms

20 ns

30 ns

33 ns

30 ns

23 ns


2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns

400 ns

70 ns

25 ns

70 ns

15 ns

25

µ s

200

µ s

250 ms

45 ns

80 ns

53 ns

80 ns

23 ns

asynch

2.4

µ s

800 ns

800 ns

1.8

µ s

400 ns

4 ns


25

µ s

200

µ s

250 ms


Notes:

1


2





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