CAT6613 데이터 시트보기 (PDF) - Unspecified
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CAT6613 Datasheet PDF : 37 Pages
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CAT6613 Datasheet
preparation of the data enable and sync signals require special extraction process (Embedded Ctrl.
Signals Extraction & DE Generator) depending on the format of input video data.
All the data then undergo a series of video processing including YCbCr up/down-sampling,
color-space conversion and dithering. Depending on the selected input and output video formats,
different processing blocks are either enabled or bypassed via register control. For the sake of
flexibility, this is all done in software register programming. Therefore, extra care should be taken in
keeping the selected input-output format combination and the corresponding video processing block
selection. Please refer to the CAT6613 Programming Guide for suggested register setting.
PCLK
DE
H/VSYNC
D[35:0]
H/VSYNC
Clock
Embedded
Ctrl. Signals
Extraction
DE
Generator
H/VSYNC
DE
DE
Data
YCbCr422
to
YCbCr444
(upsampler)
YCbCr
ٛ
RGB
(CSC)
Dithering
12-to-8
YCbCr444
to
YCbCr422
(downsampler)
HDCP
TMDS
Driver
TX2
TX1
TX0
TXC
Figure 3. Video data processing flow of the CAT6613
Designated as D[35:0], the input video data could take on bus width of 8 bits to 36 bits. This input
interface could be configured to support various data formats as listed in Table 1.
All the major video processings in the CAT6613 are done in 14 bits per channel in order to minimize
rounding errors and other computational residuals that occur during processing. General description
of block functions is as follows:
Extraction of embedded control signals (Embedded Ctrl. Signals Extraction)
Input video formats with only embedded sync signals rely on this block to derive the proper Hsync,
Vsync and DE signals. Specifically, CCIR-656 video streams includes Start of Active Video (SAV) and
End of Active Video (EAV) that this block uses to extract the required control signals.
Generation of data enable signal (DE Generator)
The CAT logo is a registered trademark of Chip Advanced Technology
2008 Chip Advanced Technology Inc. – All Right Reserved.
Mar-2010 Rev:1.0 8/37
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