Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

How to constraint my design using TimeQuest?

I am looking for some help to constrain my design. I've never done a timing constraint and my understanding of the subject isn't very deep at all. An overview of my design: it consists of a 72 ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

--- Quote Start ---

You set SO as a false path just so TimeQuest won't complain.

You ensure that you wait (at least) 1 clock cycle, not by setting constraints but by the working of your logic.

In fact, you're already waiting 2 cycles (from the synchronizers) + 5 cycles (SCK falling) before changing tmp.

I would just make SO depend on a synchronized/delayed version of nCS as well, to make sure SO doesn't go to Z too soon on the last bit.

--- Quote End ---

Ah I see. The last part should be trivial as I already have a synced version of nCS.