CLC031VEC National Semiconductor, CLC031VEC Datasheet - Page 29

• Manufacturer Part Number: CLC031VEC
• Description: IC DESERIAL/DESCRMBLR VID 64TQFP
• Manufacturer: National Semiconductor
• Type: Descrambler/Deserializerr

Specifications of CLC031VEC

• Applications: SDTV/HDTV
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *CLC031VEC

Application Information
The power pins feeding the I/O should have low inductance
connections to the power and ground planes. It is recom-
mended that these connections use at least two vias per
power or ground pin. Short interconnecting traces consistent
with good layout practices and soldering rules must be used.
Sampling or clocking of data by external devices should be
so timed as to take maximum advantage of the steady-state
portion of the parallel output data interval. The CLC031 is
designed so that video data will be stable at the positive-
going transition of V
to the data transition intervals associated with the negative-
going clock edge. The specified propagation delay and clock
to data timing parameters must be observed. When data is
being sampled from the video data port together with the
ANC port and/or I/O port, it is recommended that the sam-
pling clocks be synchronized with the video clock, V
minimize possible effects from ground bounce or output
droop on sampled signal levels.
PROCESSING NON-SUPPORTED RASTER FORMATS
The number and type of HD raster formats has proliferated
since the CLC031 was designed. Though not specifically
capable of fully or automatically processing these new for-
mats, the CLC031 may still be capable of deserializing them.
The user is encouraged to experiment with processing these
formats, keeping in mind that the CLC031 has not been
tested to handle formats other than those detailed in Table 4.
Therefore, the results from attempts to process non-
supported formats is not guaranteed. The following guide-
lines concerning device setup are provided to aid the user in
configuring the CLC031 to attempt limited processing of
these other raster formats.
In general, the device is configured to defeat its automatic
format detection function and to limit operation to a general
CLK
. Data should not be sampled close
(Continued)
CLK
, to
29
HD format. (The user should consult Table 4 for guidance on
the format groups similar to the non-supported one to be
processed). Since most non-supported formats are in the
HD group, the CLC031 should be configured to operate in
HD-ONLY mode by setting bit-5 of the FORMAT 0 register
(address 0Bh). Also, the device should be further configured
by loading the FORMAT SET[4:0] bits of this register with the
general HD sub-format code. The complete data word for
this general HD sub-format code with HD-ONLY bit set is
330h. Since this format differs from those in the table, the
EAV/SAV indicators are disabled. Without these indicators,
line numbering and CRC processing are disabled and ANC
data extraction will not function. Output video chroma and
luma data will be word-aligned. Post-processing of the par-
allel data output from the CLC031 will be needed to imple-
ment CRC checking or line number tracking.
USING EXTERNAL VCXO FOR VCLK
The EXTERNAL V
address 55h) is a special application function which enables
use of an external VCXO as a substitute for the internally
generated V
CLC031 which provides phase-frequency detection and con-
trol voltage output for the VCXO. An external loop filter and
voltage amplifier are required to interface the control voltage
output to the VCXO frequency control input. When this func-
tion is used, the R
bias supply output to the control voltage output of the phase-
frequency detector. The V
coming the input for the VCXO signal.
Figure 7 shows an example using dual VCXOs for V
handle both standard and high definition video.
CLK
. Additional circuitry is enabled within the
CLK
BB
output function is changed from the
bit of VIDEO CONTROL 0 (register
CLK
output changes function, be-
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CLK
to