Hi,
I have the EVAL-ADV7612-7511p video evaluation board .I'm using 7612 to receive HDMI inputs from camera(720p @60) , and then feed to 7511 to output the video to the screen.
camera -> 7612 --> 7511 --> screen
When adv7612 output 4:4:4 8bit ycrcb,i can see correct image on the screen,
But when i configure it to 4:2:2,the color is incorrect.
i change two registers:
1)ADV7612: 0x98 03 OP_FORMAT_SEL[7:0]
2)ADV7511: 0x72 15
if there are any other registers i should configure?
thanks,
heven
When the ADV7612 pixel output format is set to 4:2:2 (refer to the Pixel Port Output Modes section), the DPP section down converts the 4:4:4 stream from the HDMI section according to DS_WITHOUT_FILTERFor a 4:4:4 HDMI input stream to the ADV7612 The DPP section filters and downsamples the video data from 4:4:4 to 4:2:2 format if DS_WITHOUT_FILTER is set to 0. The DPP section only downsamples, without filtering, the video data from the HDMI section if DS_WITHOUT_FILTER is set to 1. For a 4:2:2 HDMI input stream, the functionality of DS_WITHOUT_FILTER is reversed. This inversion ensures that for a 4:2:2 HDMI input stream no filtering will be applied if DS_WITHOUT_FILTER is left to its default value 0. When a 4:2:2 HDMI input stream is input to the ADV7612, the DPP section downsamples, without filtering, the video data from 4:4:4 to 4:2:2 format if DS_WITHOUT_FILTER is set to 0. If DS_WITHOUT_FILTER is set to 1, the DPP filters and downsamples the video data from 4:4:4 to 4:2:2 format. And also make sure the sink is interpreting what the ADV7612 is outputting. Make sure the sink has the correct bus / pin alignment when 422 mode. 422 mode only uses 16 pins instead of 24.Please refer here ez.analog.com/.../25645 The incoming HDMI can be either RGB 444 or YCbCr 444/422. It converts the it to 444 internally for processing then converts it again to the output format, either 444 or 422422 implies there is one luminance output per input sample with the color information interleaved in the data stream with the output clock doubled. 422 also implies there is one color sample per 2 luminance sample. The color information is subsampled. RGB can not be output in 422 format. Check out en.wikipedia.org/.../4:2:2 for a better description of this format.
Thanks,
Poornima
Thanks for the response. https://ez.analog.com/video/f/qa/5442/adv7612-problems-with-hdmi-ycbcr-4-2-2-input/25645 it seems that his question hasn't been solved.
I only want to know how to configure the registers.
Could you please your register dump on this?
Have you configure the CSC register?
Have you verified the 4:2:2 Output mode in Pixel Output formats. Refer Page198 in ADV7612 Reference Manual. And also Refer to the DLL settings for 656, 8-/10-/12-bit modes in the DLL on LLC Clock Path section. Refer Page 29. And crosscheck with OP_CH_SEL[2:0] register for corresponding pin configuration.
i didn't configure the CSC register.
I Analyzed the data from ADV7612 with a logic analizer,and the data is correct. So I think the problem is 7511, not 7612.
Heven
Please refer https://ez.analog.com/video/w/documents/797/advantiv-eval-adv7612-7511-video-evaluation-board
Note: The Y1Y0 bits (0x55[6:5]), which tell the sink whether YCbCr 4:2:2,4:4:4 or RGB are sent. Refer Page60 in ADV7511W programming guide. The ADV7511W can up-convert from 4:2:2 format to 4:4:4 format as well as down-convert from 4:4:4 to 4:2:2. To convert from 4:4:4 to 4:2:2, the video data always goes through a filter first to remove any artificial down-sampling noise. The ADV7511W accepts video data from as few as eight pins (YCbCr 4:2:2 with 2x pixel clock) or as many as 24 pins (RGB 4:4:4 or YCbCr 4:4:4). In addition it accepts HSYNC,VSYNC and DE (Data Enable). Refer Page26 in ADV7511W programming guide.
The ADV7511 and ADV7511W are the same die, just different pin outs. The software should be the same except the ADV7511W has a reduced set of options that will work.
I've solved the problem.
Thanks a lot.