Pci1520 driver

This then wastes another us or so while the PCI bus retries and then runs the next cycle. Does anyone know if there's anything simple we can do to get the performance up? If there was an option to change the PCI standard so the "Retry" time could be changed and the "Delayed Transaction" avoided then it might help the timing.

I'm now writing to the Diagnostic Register and it does prevent the "Delayed Transaction". It hasn't changed the resulting timing at all though. Each cycle ends at pretty much the exact same point that it does with the retry in the middle, and it doesn't then start any earlier. Each transaction is taking about a microsecond as shown in this trace:. Our PCI master is then taking another us before staring the next cycle. All up about us per transaction.

There is no functionality present that would allow for improved performance. Since what I'm trying to do is impossible I can now stop. The only thing I had to go on was the statement that it "conforms to the standards":.

The PC Card Standard lists "standard" transfer modes that are faster than the PCI is capable of, including cycles as fast as ns. The "high-performance" noted above probably only applies to the CardBus functionality. I eventually found timing diagrams and detailed specifications in the PCI manual, assuming some commonality with the later part. With the programming we're using that should give a ns IO cycle or a us Memory cycle.

There's nothing in there that documents the large delay between back-to-back cycles that stretches it out to ns though.

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