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Altera_Forum's avatar
Altera_Forum
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17 years ago

DE2 PCB 2.x TV Decoder incompatibility

I've developed a frame grabber that runs on a 2006-vintage DE2, using the onboard ADV7181B decoder. I ordered a new DE2 last week (standard, NOT the DE2-70), and the board that came is PCB revision ...
Altera_Forum's avatar
Altera_Forum
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17 years ago

As a followup to anybody reading this in the future, I did receive confirmation from Terasic about the incompatibility. Basically, OSC_27 on the older DE2 is from the decoder and synced with the TV signal, whereas OSC_27 on the newer board is tied directly to the 27MHz oscillator. A new pin is added, TD_CLK, which is synced by the decoder with the 27MHz TV signal. Simply replacing the pin assignments doesn't work -- I would basically need to completely rewrite my decoder interface based on the new version of DE2_TV bundled with the newer board.

It would be nice if the differences in hardware versions were published somewhere other than the bundled .qsf file, but hey, live and learn.