there is one interesting observation i came across
I have one HD camera which gives out 720X576P@50Hz (27MHz video clock), it gives out active high Vsync,Hsync & data enable. when i generate the system to display out in DVI it works fine. I was surprised because active high Vsync,Hsync should not have display any thing.
when i connect HD camera 1280X720P@50Hz (74.25MHz), it gives out active low Vsync,Hsnc and active high Data enable, and i get torn display.
tomorrow i will try to generate testpattern of 1280X720@50Hz (74.25Mhz) and connect it with the design......