VGA (progressive signals) To PAL (Interlaced Signals)

[Altera_Forum]

Hi, 

 I'm currrently working on a project where i need to convert VGA to PAL. I already made the hardware by putting an AD725 on the card.   However, the AD725 component needs interlaced signals and specific signals synchronisation. Any idea on how to generate those signals in vhdl ?  Thanks

[Altera_Forum]

first of all you will need a frame buffer. 

 Then the PAL timing signals can be created simply by using counters that address into the frame buffer.