[SI-LIST] Re: About S2ibis2

Hi, Lynne
       I have already tried the second way to add Vcc_core voltage source 
within the subckt, but "no covergence" in dc sweep curves at 3.300v

       I want to try the first way .But how can I use s2ibis3 model to 
extract data from hspice?
       How can I  choose  the s2ibis3 model?



>From: "Lynne D. Green" <lgreen22@xxxxxxxxxxxxxx>
>Reply-To: lgreen22@xxxxxxxxxxxxxx
>To: <cui_930@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
>Subject: [SI-LIST] Re: About S2ibis2
>Date: Mon, 27 Nov 2006 20:50:14 -0800
>
>Hi, James,
>
>First, you must decide how Vcc_core will vary with corners.  It might vary
>in the same direction as Vcc_pu, or in the opposite direction, or not at
>all.  SPICE can help you determine the best/worst case combinations
>(corresponding to IBIS min/max corners).
>
>The SPICE input files must have Vcc (Vcc_pu) set the normal way for
>s2ibnis3.  The Vcc_core (1.8V) source must be created, with the desired
>voltage,  before the SPICE files generated by s2ibis3 are simulated.  This
>can not be done using the default s2ibis3 flow.
>
>There are two ways to add a Vcc_core voltage source under s2ibis3.  One
>could add the Vcc_core pin to the subckt AND to every call to the subckt,
>and add a Vcc_core voltage source - this requires editing EVERY SPICE file
>generated by s2ibis3, running SPICE, then running s2ibis3 model extraction.
>Alternatively, one could add a Vcc_core voltage source within the subckt -
>this has the advantage that one does not need to edit the s2ibis3 netlists,
>except to set the voltage for Vcc_core.  I personally prefer the second
>approach, but either one will work.
>
>Best of luck,
>Lynne
>
>PS: Please check my web site for upcoming IBIS training classes.  We are
>willing to arrange classes in additional locations.
>
>
>"IBIS training when you need it, where you need it."
>
>Dr. Lynne Green
>Green Streak Programs
>http://www.greenstreakprograms.com
>425-788-0412
>lgreen22@xxxxxxxxxxxxxx
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
>Behalf Of james cui
>Sent: Monday, November 27, 2006 7:47 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] About S2ibis2
>
>Hello,ALL
>thanks Lynne for your help
>I have another question about S2IBIS2.
>
>
>How can I change ".DC" sweep range to generate Pullup curve,but not change
>core power?
>(now)   **Pullup curve   Vcc=1.8v
>             **core power   Vcc=1.8v
>(I want)**Pullup curve   Vcc=3.3v
>            **core power    Vcc=1.8v
>
>Thanks
>
>
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