[SI-LIST] Re: PCI Express AC Coupling

  • From: "Thompson, Gary D (Gary)" <Gary.Thompson@xxxxxxx>
  • To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 12 Mar 2010 09:55:18 -0500

It is the intent of the PCIe spec to only have blocking caps on the TX side. 
Unfortunately, sRIO defined their blocking caps on the RX side. Sometimes, in 
order to support both PCIE and sRIO over the same pair, blocking caps on both 
ends are necessary :^(

===========================================================
Gary Thompson                 office: (512)821-6521
LSI Corp.                       cell: (512)751-8115
Networking Component Div.      email: gary.thompson@xxxxxxx
===========================================================
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Joseph.Schachner@xxxxxxxxxx
Sent: Thursday, March 11, 2010 4:45 PM
To: steve weir
Cc: Bowden, Ivor; si-list@xxxxxxxxxxxxx; si-list-bounce@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PCI Express AC Coupling

This is an interesting hypothetical discussion, but as I wrote to Chris
(visible in his "thank you") PCI Express mandates AC coupling only on the
TX side of a lane, before the card connector.  It does not mandate another
AC block at the RX, It's prettty clear that the intent of the spec is to
only have 1.

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