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Lambert's avatar
Lambert
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

About skew method for source synchronous input constrains in AN433?

Hi everyone, By viewing the training video, I have know how to set constrains of synchronous input constrains by skew method. For the case : centre-aligned (rise-to-rise) SDR I have ...
BoonT_Intel's avatar
BoonT_Intel
Icon for Frequent Contributor rankFrequent Contributor
6 years ago

Hello Sir,

It is ok as long as you have create clock for the input_clk in your constraint. To confirm on this, you can go to the time quest report, if you see the launch clock is virtual_clk and latch clock in input_clk, then it should be sufficient.

Lambert's avatar
Lambert
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Hi BCT_Intel,

I doubt that that there is skew between input_clk and dat_in in figure two, and I set constrains based on Virtual clk, and I don't give the relationship between virtual_clk and input_clk, do I can get the satisfy result according the constrains?

Best regards,

Lambert