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OrF's avatar
OrF
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

CDC-50001 - 1-Bit Asynchronous Transfer Not Synchronized

I'm trying to re-open this ticket - I didn't found how , but anyway I tried to change the default Quartus SYNCHRONIZATION_REGISTER_CHAIN_LENGTH 2 (instead of 3) and still get the same warning , ...
Timing
ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
2 years ago

Hi,


'Forced if Asynchronous' - the Timing Analyzer identifies synchronization register chains if the software detects an asynchronous signal transfer, even if there is combinational logic or only one register in the chain


Can you try set_instance_assignment (Synchronization Identification) directly to those remaining registers?


Thanks,

Regards,

Sheng