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Altera_Forum
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12 years ago

Synchronization Chains not detected

Hi there, I have clock domain crossing in my design. I use synchronization chains for metastability. In a part of my design I instantiate a custom made dual clock FIFO. After the flow is comple...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

I enabled some option in the sta options and it generated Metastability report. But I still get timing violations. The two clocks are generated from PLLs. In the sdc file I'm using the constraint :

derive_pll_clocks -create_base_clocks

Do I still need to constraint those two clock ?