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Altera_Forum
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16 years ago

TimeQuest puzzle

I am trying to learn TimeQuest and it's not going very quickly I'm afraid. I have a little MAXII example I am trying to analyze with TimeQuest that is giving me fits. In this example, I am circula...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi GPK - thanks for you answer. What is still puzzling me is the meaning of the constraint:

set_output_delay -clock EXT_CLK 0 [get_ports {EXT_CLK}]

If I understand what set_output_delay is supposed to do, I would think this means:

"EXT_CLK will take a while to get to my external device so we better delay EXT_CLK by that much to make sure EXT_CLK is correctly latched at the external device by EXT_CLK"

This sounds like nonsense to me. What am I missing?