Subject: RE: [IBIS-Users] FW: ibis doubt
From: Bill Hargin (billh@cognitionconsulting.com)
Date: Thu Jun 13 2002 - 18:22:45 PDT
Hello Akhilesh:
> Can you explain me what information we put in Vmeans, Cref, Rref &
> Vref keywards & how this information used by customer.
Cref, Rref, Vref, and Vmeas are optional subparameters to the [Model]
keyword. Include them, typically, to facilitate board-level timing
simulation. Cref and Rref subparameters correspond to the test load that
the semiconductor vendor uses when specifying the propagation delay and/or
output switching time of the model. The IBIS 3.2 spec shows the assumed
connections as:
| _________
| | |
| | |\ | Rref
| |Driver| \|------o----/\/\/\----o Vref
| | | /| |
| | |/ | === Cref
| |_________| |
| |
| GND
> 1- Our ibischecker take file name in small & if we put file name
> in capital then it gives error Why it is so.
It's probably easier to just go with the IBIS spec--which only supports 8.3
file names, all lower case characters--than to fight it. The reason for
these formatting requirements is to support both Windows and UNIX platforms
seamlessly.
I mentioned this on the SI List earlier, so I'll do it here too. My company
does IBIS training and SPICE-to-IBIS conversions. Details and links below.
IBIS Training - http://www.CognitionConsulting.com/seminars.htm
IBIS 101 — Introduction/overview.
(½ - 1 day, depending on customer needs.)
Can be incorporated with "High Speed Design" and/or
HyperLynx training.
IBIS 501 — Advanced IBIS modeling class; emphasis on IBIS 3.2 features
and SPICE-to-IBIS conversions. (1 day)
IBIS 505 — Advanced; emphasis on LVDS. (1 day)
IBIS Modeling; SPICE-2-IBIS Conversion -
http://www.CognitionConsulting.com/ibis.htm
Best Regards,
Bill Hargin
Direct: 425-702-0744
Fax: 425-702-0305
Cognition Consulting
Electronic Design Software and Consulting
http://www.CognitionConsulting.com
> -----Original Message-----
> From: owner-ibis-users@server.eda.org
> [mailto:owner-ibis-users@server.eda.org]On Behalf Of John Angulo
> Sent: Thursday, June 13, 2002 5:35 PM
> To: ibis-users@server.eda.org
> Subject: [IBIS-Users] FW: ibis doubt
>
>
> The following is posted on behalf of Akhilesh Chandra. Please send all
> private replies to akhilesh.chandra@st.com.
>
> John Angulo
> IBIS Open Forum Postmaster
>
> -----Original Message-----
> From: akhilesh.chandra@st.com [mailto:akhilesh.chandra@st.com]
> Sent: Thursday, June 13, 2002 4:12 AM
> To: ibis-info@server.vhdl.org
> Subject: ibis doubt
>
>
> Hello,
>
> Can you explain me what information we put in Vmeans, Cref, Rref &
> Vref keywards & how this information used by customer.
>
> I have some problems
>
> 1- Our ibischecker take file name in small & if we put file name
> in capital then it gives error Why it is so.
> Except IBIS all others models file name in capital so when we
> use IBIS model in our flow then it is crash.
> So it is better if our ibischecker take file name case
> insensitive.
>
> 2- Some time our file name is more than 12 character then also our
> ibischecker gives error, it should we user dependent not
> hardcoded.
>
> 3- When our file name have more then one period then ibischecker also
> shows error I think ibischecker shoud read more then one period.
>
> Thanks in advance for your prompt response.
>
> Regards
> Akhilesh
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