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

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In Intel's chipsets

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It is used to connect the communication bus between PCH and CPU

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And also it is used to transmit all data except display signals

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There are a total of four groups, point-to-point transmission, without any components in the middle

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DMI_TXN0 and DMI_TXP0 are a pair of transmitted signal lines

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DMI_RXN0 and DMI_RXP0 are a pair of receive signal lines

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This is group 0, consisting of a pair of transmit and a pair of receive signals

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Sent by the bridge, the CPU is the receiver

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Then, the CPU sends it, and the PCH receives it.

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When PCH sents, it is received by the CPU

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When the CPU sends, it is received by the PCH

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In the motherboard, they are transmitted point-to-point through the lines of the motherboard

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Direct communication between solder joints through wires

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Without any other elements in between

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This is the DMI bus, which consists of 16 lines in total