CAT6611 데이터 시트보기 (PDF) - Unspecified

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CAT6611

Single-Link HDMI Transmitter

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CAT6611

enabled to do the upsampling. Well-designed signal filtering is employed to avoid visible artifacts

generated during upsampling.

Bi-directional Color Space Conversion (YCbCr ↔ RGB)

Many video decoders only offer YCbCr outputs, while DVI 1.0 supports only RGB color space. In order

to offer full compatibility between various Source and Sink combination, this block offers bi-directional

RGB ↔ YCbCr color space conversion (CSC). To provide maximum flexibility, the maxtrix coefficients

of the CSC engine in CAT6611 are fully programmable. Users of CAT6611 could elect to employ their

preferred conversion formula.

Dithering (Dithering 12-to-8)

All the video processings in CAT6611 are done in 12 bits per channel in order to minimize rounding

errors and other computational residuals that occur during processing. For outputing to the

8-bits-per-channel formats, decimation from 12 bits to 8 bits is required. This block performs the

necessary dithering for decimation to prevent visible artifacts from appearing.

Downsampling (YCbCr444 to YCbCr422)

In cases where input signals are in YCbCr 4:4:4 format and output is selected as YCbCr 4:2:2, this

block is enabled to do the downsampling. Well-designed signal filtering is employed to avoid visible

artifacts generated during downsampling.

HDCP engine (HDCP)

The HDCP engine in CAT6611 handles all the processing requried by HDCP mechanism in hardware.

Software intervention is not necessary except checking for revocation. Preprogrammed HDCP keys

are also embedded in CAT6611. Users need not worry about the purchasing and management of the

HDCP keys as Chip Advanced Technology will take care of them.

TMDS driver (TMDS Driver)

The final stop of the data processing flow is TMDS serializer. The TMDS driver serializes the input

parallel data and drive out the proper electrical signals to the HDMI cable. The output current level is

controlled through connecting a precision resistor of proper value to Pin 24 (REXT).

The CAT logo is a registered trademark of Chip Advanced Technology

2007 Chip Advanced Technology Inc. – All Right Reserved.

June-2007 Rev:1.0a 9/29

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