CLC011 National Semiconductor, CLC011 Datasheet - Page 7

• Manufacturer Part Number: CLC011
• Description: Serial Digital Video Decoder
• Manufacturer: National Semiconductor

Output Interface — Control Outputs
PCLK (Parallel Clock): The parallel output or word clock,
PCLK, is synchronous with the parallel data outputs, PD0–9.
The rising edge of PCLK is located at the center of the par-
allel data window.
TRS (Timing Reference Signal): The active-low TRS out-
put pulse is four parallel clock periods long. TRS is active
during decoding of both composite and component video
signals.
EAV (End of Active Video): The EAV output is pulsed low
for one cycle of the parallel clock every time an EAV timing
reference is detected during decoding of component video.
The pulse is coincident with the fourth word of the timing ref-
erence (the XYZ word). During reception of composite video,
this output is always asserted high.
NSP (New Sync Position): The active-low NSP output indi-
cates that the most recently received TRS is in a different po-
sition relative to the previous TRS. NSP remains high until
the parallel rate clock is properly aligned with the TRS, then
goes low.
PCB Layout Guidelines
The CLC011 is not as sensitive to PCB layout as some Serial
Digital Video decoders. The following suggestions will help
achieve and maintain optimum system performance.
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1. Locate the CLC011 decoder away from equalizers and
2. The trace from the signal input connector to the CLC011
3. Bypass each power pin with a 0.01 µF to 0.1 µF mono-
4. Power the CLC011 and other clock recovery circuitry
Other PCB layout tips may be found in: “Keeping Analog Sig-
nals Pure in a Hostile Digital World”, Electronic Design, Spe-
cial Analog Issue, June 24, 1996, available from National
Semiconductor. Request Literature number 665502-001.
other sensitive circuitry to avoid unwanted crosstalk from
clock and data outputs which may degrade system per-
formance.
must be kept short and should not run parallel to the
data output traces.
lithic ceramic capacitor.
from a separate power supply network from that of other
digital circuitry on the board.
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