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The question about Opposite-Edge Capture Center-Aligned Input in Altera AN433

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LAORUAN

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Opposite-Edge Capture Center-Aligned Input.png

This image comes from Altera AN433.

As we can see, AN433 requires to constraint the Opposite-Edge Capture Center-Aligned Input with multicycle and false path exception. However, in my opinion, we just have to constraint that with false path exception which would remove the analysis of same-edge data transfer labelled as 1 and 2 in the image.
 

LAORUAN said:
View attachment 112126

This image comes from Altera AN433.

As we can see, AN433 requires to constraint the Opposite-Edge Capture Center-Aligned Input with multicycle and false path exception. However, in my opinion, we just have to constraint that with false path exception which would remove the analysis of same-edge data transfer labelled as 1 and 2 in the image.
Click to expand...


I practice the Opposite-Edge Capture Center-Aligned DDR input in Quartus II. I only contrait the false path, and then, I get the right result.
 

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