[SI-LIST] Re: IBIS models - What is the difference between Tri-Out & Tri-In
- From: "Jon Powell" <jonpowell@xxxxxxxxxxxx>
- To: <rakesh@xxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 12 Dec 2003 21:10:30 -0800
These things can be highly tool specific but in general, the INPUTS have
only the overshoot protection of the
overshoot protection diodes but the OUTPUTS have the additional protection
provided by the CMOS pullup and pulldown
devices (even in off state they provide back bias protection).
Once again, it depends on how the simulator itself interprets the IBIS model
data.
regards,
jon
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Rakesh Metha
Sent: Friday, December 12, 2003 8:01 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] IBIS models - What is the difference between Tri-Out
& Tri-In
Hi,
I am conducting reflection analysis on a PCI based board on the local data
bus.
There are 4- devices connected to the data bus, a PLX-9054 and 3-Spartan2
fpga's - all with 3.3V I/O's and all bi-directional.
I am using the Cadstars SI tool for analysis.
I get substantially different results when I use one of the 4-devices as a
Driver (Output).
and the other 3-are defined as either
1. Tri-Out
2. Tri-In
3. In
When I declare any on of the remaing 3 as In/Tri-in the over shoots increase
substantially.
Please help me by clarifying, what is the difefference between Tri-Out,
Tri-In and In.
and
Which is the prefered one when analysing a bus.
with warm regards
rakesh mehta
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