Subject: RE: Test load parameters
From: Bill Hargin (billh@cognitionconsulting.com)
Date: Fri Mar 01 2002 - 11:58:26 PST
Hi Laxmi:
> Can someone help me to understand -
> What are Test load parameters -C_ref,R_ref,V_ref ?
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
> What is a Test point ? For an IBIS Driver .
Test points would be out on the board (outside the driver model).
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@eda.org [mailto:owner-ibis-users@eda.org]On
> Behalf Of Laxmi Vishwanathan
> Sent: Thursday, February 28, 2002 2:21 PM
> To: ibis-users@eda.org
> Subject: Test load parameters
>
>
> Hi ,
> Can someone help me to understand -
> What are Test load parameters -C_ref,R_ref,V_ref ?
> What is a Test point ? For an IBIS Driver .
> thanks a lot ,
> Laxmi.
>
>
>
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