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

  • From: "Walter Katz" <wkatz@xxxxxxxxxx>
  • To: <gedlund@xxxxxxxxxx>, "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>, <ibis-macro-bounce@xxxxxxxxxxxxx>
  • Date: Wed, 11 Jul 2012 10:39:51 -0400 (EDT)

Greg,

 

Yes, almost. You still need a voltage swing either extracted from the VT
curves, Ramp data or [Voltage Range]. You would be assuming a zero rise
time for the driver. This is equivalent to the simple Tx Analog Buffer
Circuit described in BIRD 122. 

 

Walter

 

From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Gregory R Edlund
Sent: Wednesday, July 11, 2012 10:15 AM
To: 'IBIS-ATM'; ibis-macro-bounce@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: What part of Legacy IBIS is used by IBIS-AMI

 

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



Inactive hide details for "Walter Katz" ---07/11/2012 03:53:30 AM---I
agree."Walter Katz" ---07/11/2012 03:53:30 AM---I agree.

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:  <mailto:ibis-macro-bounce@xxxxxxxxxxxxx>
ibis-macro-bounce@xxxxxxxxxxxxx
<mailto:%5Bmailto:ibis-macro-bounce@xxxxxxxxxxxxx%5D>
[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:%5Bmailto:wkatz@xxxxxxxxxx%5D>
[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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