[SI-LIST] Re: PCI Express AC Coupling
- From: "Reams, William" <William.Reams@xxxxxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 12 Mar 2010 08:17:13 -0700
And as many of us have learned over the years, specs are guidelines (sometimes
only helpful suggestions) but do not define the known universe of how things
work. There are times when the best solution is to intentionally "violate"
specs with the knowledge of what you're doing and why you are doing it. Gary's
example would be a situation where one might need to knowingly violate specs.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Thompson, Gary D (Gary)
Sent: Friday, March 12, 2010 7:55 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PCI Express AC Coupling
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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