05-08-2019, 08:01 PM
Frank, you could try this trick on the TVP5150 too. You'd need to feed 9.27818064MHz into the decoder instead of the 14.31818MHz xtal. Actual frequency isn't too critical, at least not on the SAA7118. You could go a few % either side without any trouble at all. As I said in an earlier post, I'm now using a DTO in the FPGA to generate the clock for the SAA7118. 16 bits was more than adequate. It's switchable between 405 and 625.
If you don't have a framestore, and hence a crystal for setting the output clock speed, you've got a have a crystal in the circuit somewhere. Otherwise the system will chase its own tail.
If you don't have a framestore, and hence a crystal for setting the output clock speed, you've got a have a crystal in the circuit somewhere. Otherwise the system will chase its own tail.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
