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Altera_Forum
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17 years ago

EPM7128AE - strange FlipFlop behaviour

I use the scematic on EPM7128AE you'll see in schaltung.jpg. There is a pixelclock (signal 3) which should comes out of the JK-FlipFlop with half the frequency. This works fine but sometimes there...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

It's normal behaviour with unrelated signals. A single DFF isn't enough synchronization to use the output as a ripple clock. It should work with a second DFF level. If the delay is an issue, you can operate both FF'S on different clock edges.