Subject: Re: [IBIS-Users] Using the '.ibis' (note the dot) in HSPICE
From: Mark Bossard (mbossard@atmel.com)
Date: Tue Apr 09 2002 - 14:12:48 PDT
I would suggest checking out the Hspice Device Models Manual.
It should be part of the normal Hspice electronic documentation package.
It has a fair description and examples of using .ibis .
The Device Models Manual tells you what the node names are (or should
be).
The names of the input and output nodes for the buffers are:
INPUT and INPUT_ECL buffers signal name of pin ( in )
bufn_<pin_number> ( outofin )
Other types of buffers bufn_<pin_number> ( in ) signal name of pin (
out )
n <pin_number> is 1 if this pin is the first pin defined in the [Pin]
keyword.
n <pin_number> is 2 if this pin is the second pin. and so on.
Note: If the buffer has an enable terminal, you must create a node named
buffer_name_en to enable the buffer.
Good Luck,
Mark Bossard
Michael Dotson wrote:
>
> I have spent the last 2 days puzzling over how to use the ' .ibis ' call in
> hspice.
> Using the basic ibis buffer works ok, but this other command was there to
> try as well.
>
> The ibis device I have is a basic TS TTL buffering device that says it is
> 2.1 compatible.
>
> When hspice runs I can see that it allocates a buffer to each input and
> output pin.
> However, the stim I put on the input pin does not get propagated to the
> output pin.
> I can see the input buffer switching a-ok, but the output buffer does not.
> I have even tried different enable pin values to see if that had an effect.
>
> What seem to be missing is the 'hook' to drive the output buffers nd_in
> port.
> Actually, I do not even see a port named nd_in for the output buffers. I
> can
> see the pc and pd and en pins OK though.
>
> Can someone shed some light on my confusion?
>
> thanks,
> Mike Dotson
> IBM Endicott Worldwide Field Design Center 607-752-5379 (tl 852)
>
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