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Altera_Forum
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14 years ago

Stratix IV FF Sync V/s Async Clear

Is there any distinct disadvantage to using the synchronous clear in the Flip/Flops in Stratix IV (like restricted no. per LAB or using more logic or slower timing etc?) versus using the async. c...
Altera_Forum's avatar
Altera_Forum
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14 years ago

Many thanks. If I understand you correctly, what you are saying is that

If I use only async. clear, then the synthesizer has room to remodel some as sync.clears

and there by optimize some parameter. Whereas If I model using synch.clear

then it takes away the room for such play. There is no other disadvantage to using

synch. clears such as more LUT logic or inputs since they seem to be native to the FF

and not modeled using LUT resources.

I hope my understanding is correct.