[SI-LIST] Termination of unused PCIe pairs
- From: otter30 <otter30@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 7 Sep 2010 14:20:19 -0700 (PDT)
Hello Friends,
I am designing a carrier pcb that provides interconnect between a CPU module
and
a video processing card.
The video card supports 4x PCIe, but the CPU module has only 2 PCIe lanes
available.
Since PCIe pairs are specified to have 100ohm differential impedance, 50 ohm
resistors to ground ought to
work on the unused TX pairs. Do I also need a .1u cap in series with the
resistors for the RX pairs?
Thanks,
Jim
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