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This disclosure discusses working around PCI-X host bridge
problems with initializing PCI-X adapters.
English (United States)
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Mux for PCI-X initialization patterns
In order to guarantee that the correct PCI-X initialization pattern is driven to a PCI-X device coming out of reset, a PCI hot plug controller (HPC) can drive the initialization pattern to each device. Some solutions to this problem have the hot plug controller driving the PCI-X init pattern (comprised of the stop_n, trdy_n, and devsel_n signals) to the entire bus, and not just an individual device. A different method can be used to isolate these signals for each individual device.
You can place a multiplexor on the init pattern signals. On one input side you can have the stop_n, trdy_n, and devsel_n signals coming from the PCI-X host bridge. On the other side those signals can come from the
HPC. The HPC would also control the steering of the mux. This would allow the HPC to drive these signals during a hot plug event, and then steer control of the signals over to the host bridge device.
Disclosed by International Business Machines Corporation
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