PCI Express Architecture Guide 1th Chapter of the Reading notes the basic knowledge of PCI bus (3)

Interrupt mechanism of PCI bus

Connection between interrupt signal and interrupt Controller

Connection between interrupt signal and PCI bus

The PCI bridge specification does not require the bridge to pass the interrupt request of its next PCI device. In fact, most PCI bridges also do not provide interrupt pin intx# for downstream PCI buses to manage their downstream PCI devices.
At the same time, the interrupt mechanism in PCI Express is using the MSI interrupt mechanism. So the interrupt mechanism of the external interrupt pin I will not read for the time being.

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PCI Express Architecture Guide 1th Chapter of the Reading notes the basic knowledge of PCI bus (3)