Hi Analog Team.
What should i drive on hd,vd signals if I am working on SHA mode.
Is there any dependence to get lvds pattern with vd,hd signals.
Yes, the VD/HD inputs are needed for proper chip operation. You can use the same signal for both VD and HD is that is easier. It should be a line-rate (horizontal) signal, typically with a period of 100's or 1000's of pixels. Pulse width is typically 10's of pixel wide. The VD/HD signal should be synchronous with CLI.
My window of image is 640x512 with 20mhz pixel clock.
according to data sheet hd max is 65536 vd max is 8192 .If i make active region as 640 per line remaining 7552 as blank (8192-640) that effects video fps.My design running fps should not be effected with that.
Can you please send me the revised data sheet of 9978
You should make the VD and HD signals exactly match your image requirements. Your HD period should be 640*50ns plus H-blank interval, and your VD period should be 512*HDperiod plus V-blank interval. Your frame rate will not be affected this way.
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