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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

This is very strange. I have a data bus from registers in domain clk250Mhz. Then I perform some logic function on the bus (combinational logic). The output processed bus is then entered to a synchronization chain clocked by the other clock clk200MHz. I receive a setup violation !! It seems like the tool does not understand that the register chain is for synchronization !

Is this related to the missing constraint ?