Hi Mark,

Hello,

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I am currently using a LITE5200. There is a known (annoying) PCI issue with the MPC5200, and therdfore most of the PCI cards I have tried on the LITE5200 were not recognized. For several of them, u-boot even crashed (bus error). I was wondering if somedy has tried with success common PCI graphics cards and gigabit ethernet cards...

Please note that this problem needs two partners to be seen. On the one hand, MPC5200 violates Tvalmin by having this about 1ns instead of at least 2 ns according to spec. On the other hand, a PCI card needs to be able to handle a Tvalmin of down to 0 ns when somebody reads from it. So if both sides behave badly the card is not recognized during Type-0 configuration.

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I have tried a suggested workaround, using an ICS574 to adjust the MPC5200 PCI clock signal from the PCI bus, but still no luck with the PCI cards I have tried (although it should work with the PCI SM712 eval board).

How did you adjust the clock using the clock buffer mentioned above? Overdoing it will also cause harm especially during writes. My suggestion is to measure the real Tvalmin and then adjust it that it just reaches 2 ns.

Our Hardware engineer, John, has the following response:

Mark – thanks for the reply. I did try to do what you suggested without success but maybe I misunderstood something. If I look at the PCI clock and ADx signal, I see a Tval of about 0ns (ADx changing right along with a rising PCI clock). So I try to delay the PCI clock by approximately 27ns (33MHz PCI clock = 30ns clock period). Since I think that this is a free running clock, it should have the effect of ‘speeding up’ the PCI clock so that it gives a Tval of about 3ns. I’ve tried other delay values without success, but what I have described above is what I read what I should try to do. Am I missing something? Thanks.