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Altera_Forum's avatar
Altera_Forum
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15 years ago

Timequest Report Metastability

Timequest seems to ignore all synchronization chains except those contained in a megafunction DCFIFO. For example with the following clock definitions: create_clock -period "30.000 ns" -name ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Good point. If you pro-actively identify synchronization registers and have your own hierarchy that does it, then it's a great methodology. Of course the constraint has spaces in it, which makes the syntax a little questionable, but the following seems to work:

(* altera_attribute = "-name SYNCHRONIZER_IDENTIFICATION FORCED_IF_ASYNCHRONOUS" *) reg [1:0] sync;