FreeLists / si-list / [SI-LIST] Re: simulate ibis model in hspice ???

["Scott McMorrow" <scott@xxxxxxxxxxxxx>]

qzheng,

Andy is quite correct.  When an Ibis model is extracted with only ramps, 
all of the delay information is lost.  The best you can do is to 
correlate the rising and falling edge rates to the original Hspice, 
along with the output drive strength, to determine if the extraction was 
performed correctly.

If waveform tables are used in the IBIS model, and if the extraction is 
performed on the same Spice model that you are comparing with, the edges 
and delays should be exactly the same provided:

1) the waveform tables have not been normalized to remove leading delay. 
 But even then, the delay relationship between the edges should be 
maintained.

2) The signal used to stimulate the Ibis model in Hspice has its delay 
adjusted to triger the driver at the same absolute time as in the 
orignal Hspice simulation.

best regards,

scott


-- 
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com



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