Texas Instruments | LMH0030 (CLC030), LMH0031 (CLC031A) ‚Çô Frequently Asked Questions (FAQs) | Application notes | Texas Instruments LMH0030 (CLC030), LMH0031 (CLC031A) ‚Çô Frequently Asked Questions (FAQs) Application notes

Texas Instruments LMH0030 (CLC030), LMH0031 (CLC031A) ‚Çô Frequently Asked Questions (FAQs) Application notes
Literature Number: SNLA196
LMH0030 (CLC030),
LMH0031 (CLC031A) Frequently Asked
Questions (FAQs)
National Semiconductor
Can I directly interface the LMH0030 to the LMH0002?
The LMH0030 serializer can be directly (DC) coupled to the LMH0002 (CLC002) cable driver. It is
best to do so differentially using as short a network as possible. Two termination methods are
Design the traces of the differential pair to have a basic impedance of 75 Ω and space
them to give a 100 Ω differential impedance. The Transmission Line Rapidesigner
Sliderule is a convenient tool for this calculation. The network will begin with the LMH0030
outputs and end with the LMH0030's normal 75 Ω output pull-up resistors. These will
provide the proper line termination. The LMH0002 (CLC002) input will be located on the
network between the ends and connected in "daisy chain" fashion. This technique uses no
additional components.
Design the traces for a convenient impedance level between 50 and 75 Ω. Space the
traces to give a 100 Ω differential impedance. Again, the network will begin with the
LMH0030 outputs and end with the termination. The termination network will consist of 3
resistors, 2 output pull-ups and a parallel termination across the differential pair. The 2
pull-up resistors will be 115 Ω and the parallel termination will be 100 Ω. This combination
of resistances provides a 75 Ω load for the LMH0030 outputs and a 100 Ω termination for
the differential pair. The swing at each of the LMH0030 outputs will be 800mV. The swing
developed across the differential termination will be about 740mV. This is the proper level
for the LMH0002 (CLC002) inputs.
Relevant Part: CLC030; CLC002; LMH0002; LMH0030
The LMH0030 generates a 75% saturation color bar test pattern. Can it be programmed to
generate a 100% saturation color bar pattern?
The test pattern generator data is produced from hard-coded stored sequences of parallel video
data as well as algorithmically generated data. Provision is not made for altering the data or
substituting other data sequences.
Relevant Part: CLC030; CLC031A; CLC020; CLC021A; LMH0030; LMH0031
Can the LMH0030 and LMH0031 insert time code packets in ANC space?
Yes. The time code data (LTC) is handled the same as other ANC data. Be sure that the
appropriate DID and SDID are applied and the packets loaded for insertion in the correct lines.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Rev 1.0
1 of 9
© 2008, National Semiconductor Corp.
What type of multiplexed audio data packets do the LMH0030 and LMH0031 support?
The LMH0030 and LMH0031 are designed to handle parallel digital data samples of AES-ABU
Level-A (default) synchronous 48kHz, 20-bit audio. The data is transported in the chrominance
channel only for high definition operation. Level-A data does not require control packets in the
luminance channel. Control packets that are needed for other levels of AES-EBU data are not
supported. Multiplexed ancillary data is supported for standard definition parallel component video
operation according to the requirements of SMPTE 125M.
The LMH0030 serializer multiplexes and encodes ancillary data packets stored in its on-board
FIFO into the serial video data stream. Data is not retained in the FIFO after it has been inserted in
the serial data.
The LMH0031 de-serializer decodes multiplexed ancillary data packets from the incoming serial
video data stream. This data is replicated into and stored in the on-board FIFO. The data packets
may then be read out of the FIFO in parallel format for further processing. Data is not retained in
the FIFO after being read out.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Can the LMH0030 be used with 50Ω output loads and networks?
The LMH0030 can be used with 50Ω output networks and pull-up resistors. However, the peak-topeak output swing will decrease by 1/3rd from 800mV to 530mV. The outputs are current sinking
and the amount of current available at the output is limited by the current source supplying the
outputs. The output level (current) adjustment does not have enough range to bring the output
swing to 800mV with the lower resistance load. Generally, this reduced swing will be sufficient to
drive virtually any device especially if driven differentially. The increased load may also reduce the
transition times of the outputs. The amount of reduction depends on the capacitance characteristic
of the particular load.
Relevant Part: CLC030; LMH0030
At what times can the LMH0031 FIFO EXTRACT ENABLE be asserted?
The FIFO EXTRACT ENABLE control should be asserted at a convenient time during the active
video line interval. It should not be asserted during the ancillary data portion of the video line as
that could corrupt reception of the data by the FIFO. Also, this signal should not be asserted while
the data is being read from the FIFO. Otherwise, FIFO EXTRACT ENABLE can be asserted at any
time prior to the EAV. It is probably most convenient to read data from the FIFO during the early
portion of the active video interval and to update register controls such as FIFO EXTRACT
ENABLE during the latter portion of this interval. The transition of the H-bit during the SAV can be
used as the cue that it is time to read the FIFO and update the registers if needed.
Relevant Part: CLC031A; LMH0031
Rev 1.0
2 of 9
© 2008, National Semiconductor Corp.
Can the LMH0031 deserialize formats other than those listed in the Table 4 of the
The LMH0031 can deserialize and word-align HD formats other than those listed in Table 4 of the
datasheet. The FORMAT 0 Register (register 0Bh) must be loaded with a code which will place the
device in HD mode and which will suppress format identification.
Any of four codes can enable this type of operation. These codes differ in regard to how the device
is set to re-frame the data with regard to out-of-place TRS sequences (also called NSP or newsync-position). The codes are 10-bits in length. Bits AD[9:8] are data word identifier bits and are
always set for a data word. Bits AD[7:0] are the register content bits. The data word format is
therefore: 3XXh.
Register 0Bh bit-7 is the FRAMING MODE bit. This bit is set by default. It may be reset to change
the manner in which NSP is arbitrated. Bit-5 is the HD-ONLY bit. This bit is set for processing HD
data. And bit-6, SD_ONLY, is reset in this instance. The FORMAT[4:0] bits may all be either set or
reset. Therefore, the control data codes that enable processing of unsupported HD formats can be
330h, 3B0h, 33Fh or 3BFh. Device deserialization operation when using these codes is virtually
identical except for the way that re-framing is handled (re. bit-7). To maintain default framing
arbitration, use codes 3B0h or 3BFh.
In addition to suppressing format identification and reporting, these codes also suppress the CRC
error checking and line number functions.
Refer to the description of the FRAMING MODE and FRAMING ENABLE bits in the datasheet
section on the FORMAT 0 Register for details of the operation of the framing mode options and
Relevant Part: CLC031A; LMH0031
How can the LMH0034 be interfaced to the LMH0031?
The LMH0034 output can be DC-coupled to the LMH0034 input with a simple 100Ω differential
termination since their common mode voltages are within the same range. The termination should
be placed close to the receiver (LMH0031) input.
Relevant Part: CLC031A; LMH0034; LMH0031
Does the color bar test pattern in the LMH0030 and LMH0031 use the same chroma and
luma data for SD and HD?
Yes, The color bars use the same color gamut (luminance and chrominance data) for both SD and
HD. The extended HD gamut is not supported.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
When using the Test Pattern Generator (TPG) function, must the FORMAT SET bits of the
FORMAT 0 register be loaded for the LMH0030 or LMH0031?
No. When using the TPG function, the video format should not be set using the FORMAT 0
register. The device will automatically recognize the format according to the setting of the TEST
PATTERN SELECT bits of the TEST 0 register.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Rev 1.0
3 of 9
© 2008, National Semiconductor Corp.
Are pull-down resistors needed on unconnected CMOS inputs of the LMH0030 or
No. All CMOS inputs (except ACLK and VCLK) are equipped with internal pull-down devices.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Can I connect and drive the Ancillary/Control Port of more than one LMH0030 or LMH0031
device with a data bus?
Yes. The Ancillary/Control Port may be bussed with other similar devices for control data
functions. Control Port operation depends on three signals, ACLK, ANC/CTRL(bar) and
RD/WR(bar). ACLK is the signal which activates the port to receive or drive data. ACLK
may be gated with an externally derived chip select in order to affect reading or writing
control data to the port. Gating used for this function should be carefully designed so as
not to produce decoding glitches which could result in improper data transfers to multiple
devices. Additionally, each device has one unique “do-nothing” mode: ANC+RD for the
LMH0030 and ANC+WR(bar) for the LMH0031. When practical, non-addressed devices
should be placed in their “do-nothing” state. Following Control+Read operations, be
certain to issue a second ACLK to return the port to its address write (address load)
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Can the LMH0030 and LMH0031 handle both HD parallel rates, 74.25MHz and
Yes. Both of these rates and the corresponding serial rates, 1.485Gb/s and 1.485Gb/s/1.001, are
supported. Since the formats for both rates are the same, the frequency difference is not reported
via the Control Registers.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Can the TPG be used when other data is being input?
Yes. The TPG data will override the externally applied data and be output.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Does the duty cycle specification apply to ACLK when it is used for performing Control
Register operations?
No. The duty cycle specification for ACLK applies only to Ancillary Data operations.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Rev 1.0
4 of 9
© 2008, National Semiconductor Corp.
How do I turn off the Control Data Read operation of the LMH0030 or the LMH0031?
The Control Data Read operation is terminated by clocking ACLK once (after the data has been
read by the host system).
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
How does the Built-In Self-Test (BIST) test the device for the LMH0030 or LMH0031?
The BIST uses the Test Pattern Generator as the data source and either the CRC system (HD) or
the EDH system (SD) as the data checking system. As the test data is processed through the
device, CRC or EDH check words are computed. These check words are compared with internally
stored correct values for the data being used. The device passes the test when the computed and
stored values agree. The result of the test is stored in bit-7 of the TEST 0 register.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
How is the Video FIFO delay set for the LMH0030 or the LMH0031?
The Video FIFO delay is set from zero to four VCLK periods by writing a corresponding binary word
from 000b to 100b into bits 7, 6 and 5 respectively of the ANC 0 Control Register (address 04h). To
avoid overwriting other writable bits when writing data to this or other Control Registers, the present
contents of the register should be read by the controller and logically OR-ed with the new data
before writing the revised data into the register.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Is Ancillary Data supported in the Luminance Channel for HD?
No. Ancillary data is supported only in the Chrominance Channel.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Is power supply sequencing required for the LMH0030 and LMH0031?
Yes. The devices use two power supply voltages, 3.3V for I/O functions and 2.5V for internal logic
and PLL functions. The 3.3V supply must be applied prior to or at the same time as the 2.5V
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
What is EDH?
EDH, Error Detection and Handling, is a practice for the generation of error detection checkwords
and related status flags which is used optionally in conjunction with NTSC (system M, 525/59.94)
and PAL (systems B, G, H, and I, 625/50) serial digital interfaces which use either 13.5MHz or
18MHz sampled 4:2:2 component or 4fsc composite digital signals. EDH requirements are covered
in SMPTE RP 165. EDH functions may also be used in parallel digital interfaces supporting the
above standards. EDH is not a means of error correction.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Rev 1.0
5 of 9
© 2008, National Semiconductor Corp.
What is LSB Dithering and what is its use?
Dithering is the addition of low-level random noise to the digital data during the encoding process
by varying the two LSBs of the active picture data in a pseudo-random manner. This is equivalent
to one quantizing level of the analog signal prior to sampling. In digital video, LSB dithering is used
to break up the transitionless sequences that are produced by so-called pathological data patterns.
If not removed by the decoding process, resolution will be affected by 1/2-LSB when the data is
converted back to analog.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
What is a TRS?
TRS stands for Timing Reference Signal. A TRS is a sequence of four 10-bit words that are used
as synchronizing events in digital video data. They function in a manner similar to the vertical and
horizontal synchronizing pulses in analog video. The TRS word sequence is 3FF, 000, 000, XYZ in
hexadecimal 10-bit representation. For digital component video (4:2:2), eight unique TRS
sequences, the XYZ words, are used to denote the start and end of active video lines, SAV and
EAV, for the two fields and vertical blanking intervals. For composite data (4fsc), the TRS consists
of one sequence: 3FF, 000, 000, 000.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
What is the purpose of Ancillary/Control Data port bits 8 and 9?
Ancillary/Control Port bits 8 and 9 are used as handshaking bits during Control Data transactions.
These bits identify the type of transaction and data being processed. When the data being sent to
the port is a Control Register address, these bits must both be a binary-0. When the data being
sent to the port is Control Register data, these bits must both be a binary-1. During a Control Data
read operation, the device will assert these bits as binary-10 (hexadecimal-2). For Ancillary data
transactions, data words may be 8 or 10 bits long. Therefore, all of the port's bits may be employed
as data bits. For 8-bit ancillary data these bits should remain low.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
What is the purpose of the SD ONLY and HD ONLY bits of the FORMAT 0 register?
The SD ONLY bit, when set, limits the device to recognize and process only SDTV formats having
parallel data rates of 27MHz, 36MHz or 54MHz. The HD ONLY bit serves the same purpose and
limits the device to the HD rates, 74.176MHz and 74.25MHz, and formats. Enabling either the SD
ONLY or HD ONLY mode reduces the time required by the device to lock to and identify the format
being processed. When both of these bits are reset (0b), the device automatically detects the
range. Also refer to information about setting the video format.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Rev 1.0
6 of 9
© 2008, National Semiconductor Corp.
What is the purpose of the Video FIFO for the LMH0030 or LMH0031?
The Video FIFO may be used to insert up to four VCLK periods delay in the processing of the
parallel video data. This delay function might be used to align two or more video data streams for
processing purposes. For example, two video data streams (of the same rate) could be aligned on
SAV sequences so that data from one stream could be mixed with or replace data from the other
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
When is Control Data valid during a Control Data Read operation?
The device begins to turn and drive the Control Data port as soon as the address of the control
register to be read is loaded. The device driving the Control Data port should be placed in tri-state
immediately following the address load so as to minimize driver overlap with the port. Output data
should only be sampled after the address driver is tri-stated. Data will be driven by the port until
another ACLK is received.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Where are EDH checkwords located in the video raster data for the LMH0030 or the
EDH checkwords and status flags for NTSC component video rasters are located in the ancillary
data just prior to the EAV (End of Active Video) in Line 9 (Fields I and III) and Line 272 (Fields II
and IV). Corresponding locations for PAL systems are Line 5 (Fields I, III, V and VI) and Line 318
(Fields II, IV, VI and VIII). For composite video these locations are the same.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Which Test Patterns are Built-In Self-Test (BIST) patterns?
All of the HD test patterns are BIST data. For SD, the 270Mb/s NTSC colour bar and PAL PLL
pathological test patterns are the test data.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Why is a "0" written instead when I try to write a "1" into a Control Register bit that is
mapped as an input to the User I/O Port?
When configured (mapped) as an input to a Control Register bit, an unconnected I/O pin's internal
pull-down overrides the data being written to that bit. Longer delay in the data path via the
Ancillary/Control Port versus that from the I/O port makes this possible. When it is necessary to
write data directly to a bit that has a corresponding input on the I/O Port, the I/O Port pin should be
remapped to another control bit.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Rev 1.0
7 of 9
© 2008, National Semiconductor Corp.
Why must ACLK be toggled three times after power-on reset or manual reset?
Toggling ACLK propagates the reset signal produced by the power-on reset or manual reset
circuitry to the Ancillary/Control Port circuitry. This action completes the reset of the port and
enables data transactions with the port.
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
What is the purpose of the FORMAT SET bits of the FORMAT 0 register for the LMH0030 or
The FORMAT SET bits are used to limit recognition and processing of the video data to only one of
the fourteen SD or HD formats. These are listed in Table 4 of the respective datasheet for either
the LMH0030 or LMH0031. Setting the format turns off the format recognition system and speeds
format acquisition. The format will be reported in the FORMAT 1 register. Attempts to process
video data of other formats will result in an error condition.
Relevant Part: CLC030; CLC031A; LMH0031; LMH0030
Some HD formats are described as 1080P/60 or 1080P/30. What is the difference? Do the
LMH0030 and LMH0031 handle the higher frame rates?
There is a lot of confusion about how to refer to the eleven systems of 1125 line progressive scan
formats in SMPTE 274M. This is probably because there are two different progressive format (P)
scanning systems described in the same standard. Often, people either mix up these two systems
or are not careful to be exact when referring to them. Regardless of which System is being
described, all have 1920 active samples/line and 1080 active lines/frame, 1125 total lines.
The main differentiating factor for Systems 1-3 is the interface sampling frequency, 148.5MHz.
Systems 1 through 3 use a 50Hz, 59.94Hz or 60Hz frame rate. These systems require a 60MHz
transmission bandwidth. The LMH0030 and LMH0031 do not support this 148.5MHz interface
sampling (i.e. Vclk) frequency.
Systems 4 through 11 require a 30MHz transmission bandwidth. They use a 74.25MHz (or
74.176MHz) interface sampling frequency. These Systems use a frame rate of 30Hz, 29.97Hz,
25Hz, 24Hz or 23.98Hz. The LMH0030 and LMH0031 support the 74.25MHz (74.176MHz)
interface sampling (i.e. Vclk) frequency.
So, when speaking of a SMPTE 274M progressive format, be very careful to specify exactly the
vertical scanning rate you mean. It can make a great deal of difference!
Relevant Part: CLC030; CLC031A; LMH0030; LMH0031
Rev 1.0
8 of 9
© 2008, National Semiconductor Corp.
Can I include parallel ancillary data along with the parallel HD video data and will the
LMH0030 serialize all of this data?
Ancillary (ANC) data may be included (embedded) in the proper locations in the applied parallel
video data. The LMH0030 will serialize the combined ancillary and video data.
When the format is one of the supported HD formats, and CRC and Line Number insertion have not
been defeated, the LMH0030 will insert these automatically. Line numbers and CRCs should not be
included in the parallel data when using the normal format recognition capability of the part (default
Relevant Part: CLC030; LMH0030
Can the LMH0030 and LMH0031 handle the progressive format segmented frame system
described in SMPTE 274M, Annex A?
The progressive segmented frames (PsF) frames described in SMPTE 274M, Annex A, can be
serialized (or deserialized) by the LMH0030. If the parallel input data to the LMH0030 is properly
organized, it may be handled using the built-in automation of the LMH0030. The manner in which
the PsF frames are defined in the standard specifies that they are to be handled as if they were
interlaced frames. Before the LMH0030 can serialize the data, the 1125 line progressive picture
must be externally organized into an interlaced format as described in Annex A. The progressive
picture even-numbered lines map as interlaced lines 1 through 562 and the odd-numbered lines
map as interlaced lines 563 through 1125. In both formats, the lines maintain consecutive numbers
1 to 1125. This means that the lines of the PsF raster will be given line numbers 1 through 1125 by
the LMH0030, if the auto-line numbering is left enabled.
The PsF frames corresponding to SMPTE 274M, Annex A, Table A.1, numbers A through E, are
equivalent to Table 1, system numbers 7 through 11, respectively. These should be handled by the
LMH0030 as progressive frames.
The PsF formats correspond with the existing LMH0030 video raster formats as shown below.
Refer to LMH0030 datasheet Table 4.
Table 1 LMH0030
System #
Format Code
PsF Equivalent
After recovery of the data by the LMH0031, the interlaced format of the PsF frame can be
converted back to the original progressive format, if needed.
Relevant Part: LMH0030; LMH0031; CLC030; CLC031A
Is the CLC030 the same as the LMH0030 and is the CLC031A the same as the LMH0031?
No, The LMH0030 is an upgrade to the CLC030.
Yes, the CLC031A is the same as the LMH0031.
Relevant Part: CLC030; LMH0030, CLC031A, LMH0031
Rev 1.0
9 of 9
© 2008, National Semiconductor Corp.
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