[SI-LIST] Undershoot on a cPCI Bus
- From: "Fields, Brian" <bfields@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 7 Oct 2005 10:13:02 -0600
I'm simulating a Compact PCI backplane, and have found that the signals
show an undershoot of which is outside the manufacturers maximum
operating conditions. The FPGA devices on the bus all have internal
clamping diodes, however the voltage at which they start to conduct is
also outside the operating range.=20
Simulations with external Schottky clamping diodes show that the
transient ringing which produces the undershoot lasts for about 2ns, too
fast for the external diodes to respond. There are 10ohm series
resistors on each of the daughter cards signal lines, per the spec, and
any termination scheme would have to be implemented on the backplane.
Any ideas? I'm stumped.
Thanks,
Brian Fields
Ball Aerospace & Technologies Corp.
bfields@xxxxxxxx
(303) 939-4036
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