Design Compiler Register Retiming and CDC

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Design Compiler Register Retiming and Synchronization

Hi, I'm using the following command to retime a design in DC:

optimize_registers -sync_transform decompose -async_transform decompose

I now need to change my design in such a way that adds synchronizers for 2 inputs. How can I tell DC not to move the registers in my synchronization circuit? I read the DC retiming manual and it doesn't mention this anywhere.

Thanks
 

Re: Design Compiler Register Retiming and Synchronization


put the retiming circuitry in a separate module, don't retime it.
 

Re: Design Compiler Register Retiming and Synchronization

Thanks. Seems obvious now that I think about it, worked.
 

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