[ibis-macro] Re: What part of Legacy IBIS is used by IBIS-AMI

  • From: Gregory R Edlund <gedlund@xxxxxxxxxx>
  • To: "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>, ibis-macro-bounce@xxxxxxxxxxxxx
  • Date: Wed, 11 Jul 2012 09:15:19 -0500

What if an EDA programmer wanted to discard the VT and ramp data and
compute an "ideal mathematical" impulse response assuming a delta function?
Is that allowed by BIRD 120?  I took a quick look and didn't see anything
specific about how to calculate the impulse response.  In the "ideal
mathematical" case, I would think all you need is C_Comp and some
resistance extracted from the IV tables.

Greg Edlund
Senior Engineer
Signal Integrity and System Timing
IBM Systems & Technology Group
3605 Hwy. 52 N  Bldg 050-3
Rochester, MN 55901





From:   "Walter Katz" <wkatz@xxxxxxxxxx>
To:     <Arpad_Muranyi@xxxxxxxxxx>, "'IBIS-ATM'"
            <ibis-macro@xxxxxxxxxxxxx>
Date:   07/11/2012 03:53 AM
Subject:        [ibis-macro] Re: What part of Legacy IBIS is used by IBIS-AMI
Sent by:        ibis-macro-bounce@xxxxxxxxxxxxx



I agree.

Walter

From: ibis-macro-bounce@xxxxxxxxxxxxx [
mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Tuesday, July 10, 2012 11:44 PM
To: IBIS-ATM
Subject: [ibis-macro] Re: What part of Legacy IBIS is used by IBIS-AMI

That is correct.

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

From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Mirmak, Michael
Sent: Tuesday, July 10, 2012 6:07 PM
To: Walter Katz
Cc: IBIS-ATM
Subject: [ibis-macro] Re: What part of Legacy IBIS is used by IBIS-AMI

Walter,

Thank you!  So, someone using IBIS-AMI models with valid traditional data
in a workflow should expect changes in the IBIS TX C_comp or V-t (or
[Ramp]) data to have an impact on the results provided by the receiver in
an IBIS-AMI-based flow, assuming nothing else changes?

      -          MM

From: Walter Katz [mailto:wkatz@xxxxxxxxxx]
Sent: Tuesday, July 10, 2012 12:20 PM
To: Mirmak, Michael
Cc: IBIS-ATM
Subject: What part of Legacy IBIS is used by IBIS-AMI

MM,

The Legacy part of an IBIS model is used to generate the Impulse Response
of the channel.

One method of generating the impulse response is to do a step response, and
take the derivative of the waveform at the Rx input.

A simulator uses a combination of the Tx [Voltage Range], C_Comp, IV, VT
and Ramp data, and the Rx C_Comp and IV data. Of course, [External Model]
can also be used by a simulator.

The following required Tx IBIS fields are not used in the AMI flow:
      Vmeas
The following required Rx IBIS fields are not used in the AMI flow:
      Vinl
      Vinh

Walter


Walter Katz
wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 303.335-6156

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