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Altera_Forum
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16 years ago

Imported partition(QXP) Fmax question

I'm synthesizing a design using a bottom up flow where a top partition imports previously generated and exported lower partitions. However, the top level Fmax reported by Quartus is lower than the Fm...
Altera_Forum's avatar
Altera_Forum
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16 years ago

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pletz,

Thank you for your reply.

I have registered all inputs and outputs to the partition. However, in this case, the clock domain in question is entirely internal to the partition. It is an isolated clock island within the partition with all inputs and outputs passing through retiming logic.

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Hi,

maybe a stupid question, did you check that the setting is for "Fitter Preservation Level" is

set to "Placement and Routing". I'm not sure, but is the LL also impotrted ?

Maybe other clock routing ????

Kind regards

GPK