[SI-LIST] Re: The Implications of Nonmonotonic Transitions
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 22 Jan 2009 11:40:28 -0500
Another thing to consider with non-monotonic signals, is that it depends on
exactly where you measure. In addition to what Rob LaMoreaux said (maybe
off-line?) about non-monotonic waveforms at or near a driver, I've seen
cases where signals on a point-to-point net were badly mon-monotonic at an
IC input pin, but probably not at the die pad inside the IC. SPICE
simulations showed this, and the observed waveform was reasonably close to
the simulated one at the IC pin. If memory serves, one of these was the
input to a PLD in a DIP thru-hole package.
Some DRAMs are strange and mysterious beasts and I'd listen to whatever
their datasheet says.
Andy
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