[SI-LIST] Re: IBIS models - What is the difference between Tri-Out & Tri-In
- From: "Peterson, James F (FL51)" <james.f.peterson@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 15 Dec 2003 06:31:19 -0700
If I understand the problem (different overshoot results at the 3 loads
depending on the receiver model selected), then I would guess that only 1
or 2 of the load models has clamp diodes to Vcc and gnd, and the other load
models don't. Clamp diodes can be very helpful with overshoot/undershoot.
regards,
Jim
-----Original Message-----
From: Rakesh Metha [mailto:rakesh@xxxxxxxxxxxxx]
Sent: Friday, December 12, 2003 11:01 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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