From: Michael Nudelman ([email protected])
Date: Mon Nov 20 2000 - 12:50:33 PST
I hadn't read through the whole thing yet, but PCI is not exactly unterminated.
It uses whimpy drivers with high output Z, which serves as a series termination,
so when your voltage doubles at the end due to open load, the signal becomes
normal height, without much over/under-shooting.
Mike Mayer wrote:
> [PCI problems simulation vs. real board]
> PCI is meant to be unterminated and so there can be overshoot and
> ringing. That said, I can think of several things that can cause
> differences between simulated and measured results:
> - models (of course)
> - only looking at typ simulation data (real board may be closer to
> min or max)
> - limited bandwidth of scope used to measure board or poor
> connection to board.
> Mike Mayer
> [email protected]
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