Arpad, I thought Ignore_Bits was optional. | The following reserved parameters are optional. If the | following parameters are not present, the values are | assumed as “0”. | | Max_Init_Aggressors: | | Max_Init_Aggressors is of usage Info and type Integer. It | tells the EDA platform how many aggressor Impulse Responses | the AMI_Init function is capable of processing. | | Ignore_Bits: | | Ignore_Bits is of usage Info and type Integer. It tells the | EDA platform how long the time variant model takes to complete | initialization. This parameter is meant for AMI_GetWave | functions that model how equalization adapts to the input | stream. The value in this field tells the EDA platform how | many bits of the AMI_Getwave output should be ignored. Greg Edlund Senior Engineer Signal Integrity and System Timing IBM Systems & Technology Group 3605 Hwy. 52 N Bldg 050-3 Rochester, MN 55901 From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx> To: "'ibis-macro@xxxxxxxxxxxxx'" <ibis-macro@xxxxxxxxxxxxx> Date: 04/06/2012 05:21 PM Subject: [ibis-macro] Re: Question, re: drastic differences between Statistical and Bit-by-bit simulation results. Sent by: ibis-macro-bounce@xxxxxxxxxxxxx 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] Sent: Friday, April 06, 2012 01:39 PM To: 'IBIS-ATM' <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 +1-408-544-7667 - desk Did you know Altera offers over 150 free online technical training courses? Take one today! Confidentiality Notice. This message may contain information that is confidential or otherwise protected from disclosure. If you are not the intended recipient, you are hereby notified that any use, disclosure, dissemination, distribution, or copying of this message, or any attachments, is strictly prohibited. If you have received this message in error, please advise the sender by reply e-mail, and delete the message and any attachments. Thank you.