I have set PICFG parameter ,but it still work wrong.Is there any special timing requirements to separate H,V,F sync signals?
What is your video input? Looks like PAL video in the case that is working. In the non-working case you have set the part to custom mode where you need to manually program the video format. If you want to use HVF with the same input video, the only thing to change is bit 6 of the PICFG parameter should be 1.
They have to be the correct SMPTE timings for the video format you are using, there's nothing special beyond that.
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