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Hello everyone, today let's learn about the FDI bus between CPU and PCH

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The FDI bus is in the Intel chipset and is used to connect the communication bus between the PCH and the CPU

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It is only used to transmit display signals, point-to-point one-way transmission, without any components in the middle

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There are 4 FDI buses in Intel 6~7 series chipsets

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Later, in the Intel 8 series chipsets, there are only 2 groups left

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In the later Intel 100 series chipsets, this FDI bus is completely cancelled

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From this architecture diagram we can see that the FDI bus is connected between the CPU and PCH

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They are one-way transfers, only sent by the CPU to the PCH

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Mainly used for PCH output display signal

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In Intel 6~7 series chipsets

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The display signal of the screen, the display signal of HDMI are both output by the PCH

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In Intel 8-series chipset

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The screen display signal is directly output by the CPU

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Only the display signal of the CRT interface is output by the PCH (bridge)

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Its signal source comes from the CPU through the FDI bus to the bridge, and then the bridge to the CRT interface

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When we say bridge, we mean PCH

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In this circuit diagram, you can see that the FDI bus sent by the CPU to the PCH is directly connected

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There are no components connected in the middle, which is called point-to-point transmission

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This is the FDI bus between CPU and PCH