RE: [SI-LIST] : PCI Driver Output Impedance

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From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Wed Sep 06 2000 - 09:32:39 PDT


>during PCI simulations I've seen that some PCI output drivers send down
>a 50 ohm transmission line incident waves as high as 3V in 3.3V systems.
>This is determined by their output impedance of only 5-7 ohm (best
>case):

8 ohms is about as small as it should ever be. Less than that would violate
the PCI spec. Even 8 ohms can be problematic. Sounds like these may not be
PCI compliant output drivers.

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