Subject: [IBIS-Users] using an ibis model
From: Robert Haller (rhaller@sisoft.com)
Date: Fri Sep 27 2002 - 06:32:24 PDT
Yoni,
1. It appears from excerpt of the posted .ibs model that this is a 1
pin model. If you mail me the entire model I could verify this.
2. To determine what type of model it is, you need to search the
.ibs file for [model] bsstl2c2_a then check the model_type value.
looking at your IBIS "B call" it appears you have an I/O cell. If this
were an input cell then the bcall would have 4 nodes (and would error
with the 6 node B call). If this is an I/O cell, then the nodes would
translate as such;
in - (driver input stimulus of I/O cell) - typically refered to as "A"
out - (this is the I/O cell pad) - typically refered to as PAD
en - (enable pin) - typically refered to as O_EN
vout _of_in (the output pin of the input receiver) typically Z
nd_pu - power rail - typically VCC
nd_pd - ground rail - typically GND or 0
3. So depending whether you want to hook up to the output of the
reciever (i.e. on chip received signal) or the PAD of the I/O cell you
should hook up to "V_out_of_in" or "out" (respectively).
If this is not clear please feel free to drop me a line directly.
Regards,
Bob Haller
www.sisoft.com
-- Robert J. Haller (rhaller@sisoft.com) Principal Consultant Signal Integrity Software Inc. 6 Clock Tower Place, Suite 250 Maynard, MA 01754 Phone: (978) 461-0449, ext 15Angulo, John wrote: > The following is posted on behalf of Yoni Tzafrir at Siliquent Technologies. Please send all private replies to yonitz@siliquent.com only. > > ------------------------------- > hi, > i'm using an input/output ibis model buffer, in my Hspice simulation. > from my netlist: > > b_output nd_pu nd_pd out in en v_out_of_in > + file='filname.ibs' > + model='modelname' > > and i've connected the in node to my netlist as a reciever, and it seems to > work well. > > but looking at the ibis file i am seeing: > > Pin] signal_name model_name R_pin L_pin C_pin > 1 PAD bsstl2c2_a NA NA NA > > 1. what does it mean, does the buffer has one pin only? > 2. which one is it (the in-pin the out-pin the v_out_of_in)? > 3. if the answer to the first question is yes, so how do i connect this pin > to my circuit in the netlist? > > please ansewr, the Hspice user-guide is not clear on this issue > yoni.
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