Overview of how the motherboard works.

Last Update Time: 2019-03-21 11:05:54

The motherboard is the core part of the computer system, and it is the largest board in the computer. The motherboard has a variety of slots and interfaces that carry important components such as CPU, memory, video cards, hard drives, and provide a hub for data exchange for these devices.


After a motherboard is powered up normally, the circuits start to work. When the important signals such as the working voltage, reset signal, PG signal and working frequency of the CPU are satisfied, the CPU begins to empty the internal registers, and passes through such a path as the CPU / North Bridge chip / South Bridge Chip. Issue an instruction to the BIOS chip on the motherboard to locate the BIOS. If the setting of BIOS is correct, CPU reads the settings in BIOS, initializes the memory, chipset, video card, network card, and so on according to the preset BIOS program, and passes the interrupt controller in the South Bridge chip. Assign the correct interrupt number to these devices to enable them to function properly. Then the CPU issues an instruction to map the contents read from the BIOS to the high-end memory of the motherboard, and reads the BIOS, of the graphics card to transmit the data to the video card part through the PCI-E bus, which is processed by the video card. Finally, the image is output to the monitor.

 The above is the motherboard boot process.

This article is from Allicdata Electronics Limited. Reprinted need to indicate the source.