[SI-LIST] Re: Rise time of driver in Specctraquest

Bob,

The rise and fall times in the custom menu are calculated from the 
wave-table, (V/T), data.  The only difference is that SigXp calculates it 
from 0-100% as opposed to 20 - 80%.  It should be similar since the IBIS 
data is typically generated by driving the buffer into a test load.

The rise and fall times are only valid into the "test load."  These may 
differ from the actual rise/fall times in your system since the loading 
will most likely be different from the test load.

-Chris Brewster
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR 97062-3090
(503) 885-1231
http://www.siqual.com


At 06:37 PM 10/15/2001 -0700, Bob Patel wrote:

>Hi! In SigXplorer when you click on the stimulus
>setting of the driver and select CUSTOm on the right
>hand side the tr and tf values are displayed.
>Are the tr and tf values calculated by driving a
>standard test load because I do get the same number
>when I measure the rise time on the buffer delay
>waveform.
>When doing calculations using rise and fall time is it
>Ok to use the numbers from above.
>Bob
>
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