Analysis of PCI interrupt mechanism: PCI bus has four interrupt lines. All PCI devices use these four lines to apply for interrupts to the system. The interrupt request is routed to an interrupt request input pin IRQi of the programmable interrupt controller through a programmable interrupt router. The interrupt controller then applies for interrupt to the CPU. After the CPU responds to the interrupt, it obtains the entry from the interrupt entry table or the entry chain, and then enters the interrupt service program for execution. 1 Keywords: PCI interrupt; hardware composition; routing PCI (Peripheral Component Interconnect) bus is a method of connecting computer components first proposed by Intel. It was originally used to improve the working efficiency of the motherboard and is now used for fast communication between peripheral devices and the computer\'s central processing unit. 1 PCI bus is a 32/64-bit address data multiplexing bus that is independent of the microprocessor and supports burst transmission with a maximum transmission rate of 132MB/s (32-bit transmission). 1 PCI bus supports plug-and-play. Its technical means is to provide a configuration space for each PCI device. The operating system detects all PCI devices during the self-test (POST-Power On Self Test) process. Device, read the device configuration information, and allocate system resources to each device, such as interrupt, I/0 space, memory space, etc. 1PCI interrupts can be shared and automatically configured.
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