[SI-LIST] Re: PCI Express AC coupled signals
- From: Ivor Bowden <ivorlist@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Nov 2007 13:47:25 -0800
Thanks to all who replied :-)
All replies confirm this should be OK, I expected as much, but it is
good to have consensus!
Ivor
on 11/14/2007 7:43 AM PDT Ivor Bowden wrote:
> Any reason why not to locate the PCI Express coupling caps at the
> receiver on a system board implementation? I know PCI Express Base
> Specification section 4.3.1.2 calls out "The requirement for the
> inclusion of AC coupling capacitors on the interconnect media is
> specified at the Transmitter", but there are no specific placement rules
> except the specifications for separate host / card module require that
> physical division. Based on the recent "AC Coupled Signals" thread, it
> would seem reasonable to place the capacitors at the receiver on a
> system board, allowing the advantage that the mounting pads could be
> used for probing - eliminating the necessity of separate test points at
> the RX end.
> Thanks,
> Ivor Bowden
> Hardware Engineer
> Curtiss-Wright Controls Embedded Computing
>
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