[SI-LIST] Re: IBIS Model VT Curve Length
- From: "Scott McMorrow" <scott@xxxxxxxxxxxxx>
- To: mike_donnelly@xxxxxxxxxxx
- Date: Thu, 17 Apr 2003 13:17:43 -0700
Mike,
That's good to hear.
Anyone overclocking an IBIS model should, however, be aware that when
the device is run in this way, the output transistors are no longer
fully saturated. This will alter the average output drive strength and
capacitance, which will cause the measured delay and waveshape of the
driver to change. For relative timed busses, like source synchronous
busses, this would not be a major issue as long as all drivers are
identical. But for synchronously clocked systems, there can be some
additional timing skew between devices that are "overclocked" and
devices which are not.
YMMV
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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