22/08/2025

How do you handle timing when the capture flop frequency is twice the launch flop frequency?

o   Tools calculate phase shift as explained below. If same clock drives launch and capture, phase shift is equal to one clock period.

o   Phase shift represents the delay adjustment being used for the projection of the most restrictive non-zero delta time into the first clock cycles of the unrolled clocks.

o   https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000nVCuEAM&pageName=ArticleContent

o   https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000nUvuEAE&pageName=ArticleContent

o   Leading edge info



o   Timing Analysis Approach:

o   Phase shift = time period of capture clock in this case.

o   It may need MCP if required.

 

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