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BT656 video decoding using DM6435 board.

mahesh gohil
Prodigy 190 points

Hi,

I am decoding BT656 video format from one of the board by using DM6435 board. I think the board is not giving data. when I captured data using Logic analyzer it gives me code like (FF-00-00-B6 it is EAV)--- (10 for 31.78us seems blanking)----(FF-00-00-AB it is SAV)---(10 for 31.78us seems blanking) A2 channel. Is this exact bt656 format ? There is not any transaction that we can consider it as video data.

Can anybody suggest me what could be BT656 format means SAV ,EAV blanking code ? LA image and signals wave forms are attached.Though BT656 is 8 bit format is does not require clock here clock signal is just for reference. Some times I got clock by DC biased as shown below. Is this because of clock integrity or encoder is not giving any video data means not properly configure.

So please let me know your thoughts.

Fig 1 LA Reading


Fig 2 Clock

Fig 3 Data0 and Clk

Fig4 Data4 and Clk