VS6724 datasheet(29/118 Pages) STMICROELECTRONICS

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VS6724

Functional description

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2.9.2

Line / frame blanking data

The values which are output during line and frame blanking are an alternating pattern of

0x10 and 0x80 by default. These values may be changed by writing to the BlankData_MSB

and BlankData_LSB registers in the

Dither control bank.

2.9.3

YCbCr 4:2:2 data format

YCbCr 422 data format requires 4 bytes of data to represent 2 adjacent pixels. ITU601-656

defines the order of the Y, Cb and Cr components as shown in

Figure 13.

Standard Y Cb Cr data order

The VS6724 bYCbCrSetup register can be programmed to change the order of the

components as follows:

Figure 14. Y Cb Cr data swapping options register bYCbCrSetup

2.9.4

YCbCr 4:0:0

The ITU protocol allows the encapsulation of various data formats over the link. The

following data formats are also proposed encapsulated in ITU601-656 protocol:

●

YCbCr 4:0:0 - luminance data channel

This is done as described in

Figure 15. In this output mode the output data per pixel is a

single byte. Therefore the output PCLK and data rate is halved.

It is possible to reverse the overall bit order of the component through a register

programming.

EAV Code

START OF DIGITAL ACTIVE LINE

HSYNC SIGNAL

4-data

packet

in 4-byte data packet

Components order

1st

2nd

3rd

4th

DEFAULT

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