[SI-LIST] Re: [Ethernet models and simulation]

  • From: "Painter, Chris" <Chris.Painter@xxxxxxxxxxxxxxxxxxx>
  • To: 'Robert Kezer' <Robert.Kezer@xxxxxxxxxxxxx>,si-list@xxxxxxxxxxxxx
  • Date: Mon, 2 Jun 2003 11:08:25 -0400

Robert,

That's how I usually deal with models, but I seem to run into dead-ends
whenever I'm working with Ethernet.  Have you done any Ethernet simulations?
The reason I ask is that I have received IBIS models or chips that did not
have the Ethernet pins characterized.  I've seen this in Broadcom's models
for the BCM5421 where everything but the Ethernet Tx/Rx pairs were
characterized.

Chris

-----Original Message-----
From: Robert Kezer [mailto:Robert.Kezer@xxxxxxxxxxxxx]
Sent: Monday, June 02, 2003 7:35 AM
To: Painter, Chris; si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] 


These models exist, but you have to get them from PHY vendor. Some
vendors are Broadcom, Marvel, etc...

-----Original Message-----
From: Painter, Chris [mailto:Chris.Painter@xxxxxxxxxxxxxxxxxxx]
Sent: Friday, May 30, 2003 5:29 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] 


All,

I have run across many instances where Ethernet signals were incorporated in
PCB designs we are working on, and there has been a desire to analyze these
circuits to verify signal integrity, particularly for "gigabit Ethernet".
To date, I have not been able to find models (neither IBIS or HSPICE) to
perform simulation with.  I've also been able to find basic electrical
information such as voltage levels, edge rates, and VI curves to cobble
together rough approximations of models.  I recall questions about Ethernet
models being posted here in the past, but have never seen any replies.  Is
it a fact that models do not exist, and if so, what are the characteristics
of Ethernet signaling that prevents models being developed?  Is simulation
the wrong approach to take when evaluating Ethernet in a PCB?  If so, what
are the alternatives?  I'd appreciate any feedback or suggestions.  Thanks
in advance.

Christopher Painter (chris.painter@xxxxxxxxxxxxxxxxxxx)
Electrical Design Engineer
Tyco Electronics
Austin Division
Phone: 512-250-6934
Fax: 512-250-6940
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