AnsweredAssumed Answered

ADV7341 20 bit YCbCr In

Question asked by gobooth on Dec 6, 2012
Latest reply on Dec 6, 2012 by GuenterL

I have an ADV7181 dev board.

I am checking the ADV7341 on the board for CVBS out.

I am inserting a 525i YCbCr 10 bit and 20 bit signal into the AD7341, I have disconnected the ADV7181.

When I set my input for 10 bit it works fine.

When I set for 20 bit with the following inputs to the Register Control  3.56 I get a good black and white picture, but no color.

I have set register 0x80 for Y/C swap for the ADV7181 board and verified I have CbCr input to C 9-0. I have Hsync and Vsync positive.

If I set my input for EIA/DEA 861 sync compliance and Register 0x86 to 0x08 for SD EIA/CEA I get no picture.

 

Do you have any ideas to fix my 20 bit no color? And no picture for EIA 861 compliance?

 

 

 

Table 69. 20-Bit 525i YCrCb In, YPrPb and CVBS/Y-C Out Subaddress

Setting

Description

0x17

0x02

Software reset.

0x00

0xFC

All DACs enabled. PLL enabled (16×).

0x01

0x80

SD input mode.

 

 

Y/C swap

0x80

0x10

NTSC standard. SSAF luma filter enabled. 1.3 MHz chroma filter enabled.

0x82

0xC9

Pixel data valid. YPrPb and CVBS/Y-C out. SSAF PrPb filter enabled. Active video edge control enabled. Pedestal enabled.

0x88

0x18

20-bit input enabled.

0x8A

0x0C

Timing Mode 2 (slave). HSYNC/VSYNC

 

Outcomes