[ibis-macro] Re: Question, re: drastic differences between Statistical and Bit-by-bit simulation results.

I agree with most everything Casey says, except with this:

“the model user's guide should have some recommendation for 'ignore bits'”

because “Ignore_Bits” is a required AMI reserved parameter
which must be present in every .ami file to tell the EDA tool
how many bits it should ignore.  So there is no need for any
recommendations in the User’s Guide.

Thanks,

Arpad
==============================================================

From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] 
On Behalf Of Morrison, Casey
Sent: Friday, April 06, 2012 2:13 PM
To: 'DBanas@xxxxxxxxxx'; 'ibis-macro@xxxxxxxxxxxxx'
Subject: [ibis-macro] Re: Question, re: drastic differences between Statistical 
and Bit-by-bit simulation results.

Hi David:

Yes, if there's such a difference then that suggests an issue with the model or 
possibly some simulator settings. If the model has a GetWave function, then it 
would suggest that GetWave is putting out an all-zero waveform. I know some 
models do this until the various adaption algorithms in the RX reach 
convergence, at which point they start outputting sensible data. If this were 
the case, the model user's guide should have some recommendation for 'ignore 
bits', which will basically instruct the simulator to ignore that waveform 
data. If the model does not have a GetWave, then that would suggest an issue 
with the simulator potentially.

Regards,
Casey

From: David Banas [mailto:DBanas@xxxxxxxxxx]<mailto:[mailto:DBanas@xxxxxxxxxx]>
Sent: Friday, April 06, 2012 01:39 PM
To: 'IBIS-ATM' <ibis-macro@xxxxxxxxxxxxx<mailto:ibis-macro@xxxxxxxxxxxxx>>
Subject: [ibis-macro] Question, re: drastic differences between Statistical and 
Bit-by-bit simulation results.

Hi experts,

If I’ve got a case where a `statistical’ mode simulation produces a reasonable 
looking eye, but a `bit-by-bit’ mode simulation of the same circuit produces a 
flat line, is that indicative of a particular problem with the models?

Thanks,

David Banas
Sr. Member Technical Staff
Altera<http://www.altera.com/>
+1-408-544-7667 - desk

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