18-08-2019, 10:50 AM
Hi Jeffery
The embedded H syncs are good so I am using the SAV signal from them and also using the odd/even signal from the LM1881.
The odd/even signal I use to produce a frame reset signal. When it changes from '0' to '1' a flag is raised. On the next SAV after the flag is raised the frame reset signal is produced and the flag is reset.
Everything else is done with counters.
The lock is good and solid. It does need the frame store to work as the video clock from the TVP5150 is too jittery to drive a PLL reliably.
Frank
The embedded H syncs are good so I am using the SAV signal from them and also using the odd/even signal from the LM1881.
The odd/even signal I use to produce a frame reset signal. When it changes from '0' to '1' a flag is raised. On the next SAV after the flag is raised the frame reset signal is produced and the flag is reset.
Everything else is done with counters.
The lock is good and solid. It does need the frame store to work as the video clock from the TVP5150 is too jittery to drive a PLL reliably.
Frank
