RE: PCI 2.2 question

["Reasoner, George E" <George.Reasoner@unisys.com>]

I was also having problems using a PCI board with the AMCC S5933QE in a
newer computer when using bus master transfers. It turns out that there is a
"bug" in the S5933QE that is activated by Special Cycles on the PCI Bus
where the IDSEL signal is active during the Special Cycle. This is
documented in http://www.amcc.com/pdfs/SumQE4.pdf. Apparently the chipsets
in the newer computers are aggravating this bug. AMCC has a new part, the
S5935QF that is a drop-in replacement for most applications. It took care of
the problem for us.

Regards,
George Reasoner
Unisys Corporation

-----Original Message-----
From: Allen, Douglas [mailto:Douglas_Allen@perkinelmer.com]
Sent: Tuesday, April 11, 2000 2:23 PM
To: ''
Subject: PCI 2.2 question


A couple of years ago, I designed a PCI board using the AMCC 5933QE chip.
Recently, I found that
I was receiving data errors when running the board on some newer computers.
So far, the only common
thread I see is that all of the computers on which it fails are specified as
PCI V2.2. Are there known
issues when using a PCI 2.1 board in a PCI 2.2 bus? Since I have not been
designing PCI cards of late, 
I was wondering if there was something I did not take into account with the
new spec.

Any help would be greatly appreciated.

Thanks.

Mark Allen
Douglas_Allen@perkinelmer.com