[SI-LIST] : PCI Driver Output Impedance

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From: Josip Popovic (popovic@mosaid.com)
Date: Wed Sep 06 2000 - 08:34:03 PDT


Hi all,

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):

Vincident = (3.3/(6+50 ohm))*50 = 2.95 V

Such high an incident wave value would make a PCI output driver to be an
incident wave switching device rather then reflected wave device.

My question would be what values of PCI driver output resistances do
some of you see during simulations or would target for during PCI output
driver designs?

Josip

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