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Difference between logic elements mentioned in flow summary and synthesis summary

sidd
Novice
508 Views

After compiling RTL, we get compilation report. In compilation report we get Flow summary, Analysis and synthesis summary. Both reports are giving me different number of logic elements used. What is the difference between two? LEs used has to be a same number in both reports right? 

I have compiled for MAXV device. 

MAX V CPLD programming specifications 

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sstrell
Honored Contributor III
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The final numbers to use are in the Fitter section of the compilation report.  Any numbers from an earlier stage of compilation are estimates and usage before final Fitter optimizations.

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sstrell
Honored Contributor III
500 Views

The final numbers to use are in the Fitter section of the compilation report.  Any numbers from an earlier stage of compilation are estimates and usage before final Fitter optimizations.

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sidd
Novice
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Thanks @sstrell  for reply.

I have one more question.

What percentage of LEs ideally shall be used ? Any impact on performance if more than 90% of LEs are used?

 

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sstrell
Honored Contributor III
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It depends on the design.  There's no ideal percentage.  It may not be so much the performance as it is the Fitter's ability to fit a large design in the device while still meeting the timing requirements.

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