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Altera_Forum
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14 years ago

Quartus II and the funny synthesis attributes

Hi everyone, Last week I noticed some funny results after the implementation of my desing in Quartus II 11.0. Inside it there are two simple register chains, each one made up of three registers o...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Besides the .qsf syntax, I go to the Hierarchy Browser, find the hierarchy that's problematic, and right-click -> Locate -> Assignment Editor. The AE comes up with the full entity name populated in the top Filter bar. I copy that and Paste it into the To column, then select the assignment Auto Shift Register Replacement and set the Value to Off.

Note that synthesis should be smart about this, i.e. it may do this at first when the design has open M9Ks, but as you add more memory, these should get demoted back to using logic.