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Hello,everyone

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Today let's learn about the PCIE bus of PCH

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First of all, the PCIE bus line is a high-speed, serial, computer expansion bus standard

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It was proposed by Intel in 2001

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PCIE bus belongs to high-speed serial point-to-point dual-channel high-bandwidth transmission

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There are several interface modes with different speeds

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Including X1, X2, X4, X8, X16, etc.

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Notebook motherboards usually use PCIE x1 speed to connect network cards and wireless network cards, as well as card readers and other devices

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It can also be used to extend other external devices

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The structure of the PCIE bus: it is composed of a pair of sending siganl, a pair of receiving signal, and a pair of clocks

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The pair of transmit signals are transmitted through two capacitors

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These two capacitors are coupling capacitors, which are connected in series in the signal circuit

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This pair of receiving signals and this pair of clocks do not need to pass through the coupling capacitor when communicating

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This is the characteristic of PCIE bus

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So we see that this network card chip also has two coupling capacitors next to it

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It is a pair of transmit signals of the PCIE bus

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The m.2 interface is usually used to connect a wireless network card, or a solid state drive

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When used for wireless network card, it only needs to use PCIE x1

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When used for SSDs, it needs to use PCIE x4

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This is the common PCIE bus connected to the PCH chip in notebook motherboards