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Questions tagged [pci]

The Peripheral Component Interface (PCI), a parallel master-slave bus, was the dominant bus to connect computer peripheral cards in personal computers and servers. It was mostly superseeded by the very different PCI express (PCIe) interface.

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Understand the Primary/Secondary/Subordinate Bus number in PCI/PCIe Bridge

I am new to the PCIe world. I am learning the enumeration and configuration of PCIe hierarchy. Some quote from here: For PCI-PCI bridges to pass PCI I/O, PCI Memory or PCI Configuration address ...
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Why are PCIe Config Writes non-posted?

In PCIe, why are config writes non-posted? Why can't they be like mem_wr which are posted?
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What limits the number of buses, devices and functions on a PCI bus?

I am learning the PCI/PCIe bus. I learned that: A PCI hierarchy can support at most 256 buses. A PCI bus can support at most 32 devices. A PCI device can have at most 8 functions. I checked the ...