[ibis-macro] Re: Question on package models
- From: Mike DeVita <Mike.DeVita@xxxxxxxxx>
- To: Arpad_Muranyi@xxxxxxxxxx
- Date: Wed, 11 Nov 2009 11:36:14 -0700
Hi Arpad,
Thanks for the reply. Please see if understand the flow with AMI.
A .DLL and a .AMI represent the RX and TX algorithmic model. They are
"hooked" up with a TX IBIS model that includes a TX package model, also a
EBD or other model that represents the PCB, and then to a RX IBIS model
which includes a RX package model. A pulse is given to get the channel
response and then the AMI simulations can begin. Is this correct?
As I understand it an IC vendor would develop the .DLL and .AMI file along
with the IBIS file which would include a package model. This model
"bundle" (.ibs, .ami. .dll) would be supplied by IC vendor to OEMs for
channel analysis.
The package model currently is only coupled/uncoupled RLC data. If IC
vendor 1 is a supplier of a TX device and IC vendor 2 is a supplier of a
RX device and a OEM user wants to model the channel with IC vendor 1 and
IC vendor 2 parts, are they relying on the IBIS package model for that
portion of the channel? Doesn't the IBIS model make calls to the AMI DLL
for the AMI simulation? When it does is it using the package RLC data as
part of the analog portion of the channel response or is it looking
elsewhere for a S parameter model?
Mike DeVita
Staff Engineer,
Application Engineering & Characterization
VM 480 821-2408 ext 5021
FAX 480 821-1713
EM mike.devita@xxxxxxxxx
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"Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
11/11/2009 10:53 AM
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[ibis-macro] Re: Question on package models
Mike,
AMI is kind of unrelated to the package model. AMI is
an algorithmic model which uses a channel response and
processes it with statistical algorithms.
The reason I said "kind of" is because for generating a
channel response, you have to have a full description of
the channel, including the Tx, Tx_pkg, T-lines (connectors
vias, etc), Rx_pkg, Rx. This is what we call the analog
simulation which you need to do once to generate a
channel response, but this is usually an independent
simulation step which precedes the AMI "simulations".
Arpad
============================================================
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Mike DeVita
Sent: Wednesday, November 11, 2009 11:00 AM
To: IBIS-ATM; ibis-macro-bounce@xxxxxxxxxxxxx
Subject: [ibis-macro] Question on package models
Hi,
How does the IBIS package model (either embedded or stand alone) work with
a AMI based link? Is it still expected to provide RLC data coupled and/or
uncoupled? I do not think this is sufficient to correctly model the
package portion of the channel for use with an AMI block/high speed
SERDES.
Mike DeVita
Staff Engineer,
Application Engineering & Characterization
VM 480 821-2408 ext 5021
FAX 480 821-1713
EM mike.devita@xxxxxxxxx
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