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THAUS1's avatar
THAUS1
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3 years ago

MAX10 EPE M9K Fmax limit?

Hi, I try to use EPE on MAX10. I generate accuTrack_early_pwr.csv file. My design have some dual port block ram running at 320MHz: BLOCK,M9K,count,1,ram_mode,"Simple Dual Port",ram_read_during_...
SyafieqS's avatar
SyafieqS
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3 years ago

Thiery,


Is it possible for you to attach a small test case for me to replicate it?

I can see there is limitation discrepancy information.


THAUS1's avatar
THAUS1
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3 years ago

SyafieqS,

It's not possible for me to send you my project. But I've attached some screenshots of discrepancy informations in TimeQuest :

Report all summaries show a few error on minimum pulse width , but it's ok:

OVERCLOCK_VIDEO have positive slack in setup and hold (so it's ok):

and Fmax summary show a limitation on 'OVERCLOCK_VIDEO', setted at 320MHz using PLL, but with restriction at 250MHz (according the datasheet value):

So my points are :
1°) there is a Fmax violation (320MHz >> 250MHz max allowable frequency), without underline in red. why? Isn't it a timing error?
It doesn't appear in 'report all summaries', neither in 'report top failing path'.
2°) the M9K datasheet limitation is 250MHz. This limitation is increased to 260MHz in Early Power Estimator .xls import macro. Why? is it a typo in EPE?

Thanks for your feedback.