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RE: PCI 2.2 question
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.
From: Allen, Douglas [mailto:Douglas_Allen@perkinelmer.com]
Sent: Tuesday, April 11, 2000 2:23 PM
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
Any help would be greatly appreciated.