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Hello everyone, in this lesson we will take a look at the working conditions of the network card

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The working conditions of the network card are simpler than that of the sound card

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The network card is a PCIE device, and its working conditions are power supply, clock, reset and bus

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The power supply of the network card is generally 3V

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Moreover, the network card generally generates a power supply of about 1V by itself.

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The next is the clock

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This clock is the 25M crystal oscillator of the network card, usually around the network card

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Reset signal is the platform reset signal

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The bus is PCIE bus

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The network card is a PCIE device, which occupies a set of PCIE buses

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A set of PCIE bus is 6 lines, including 4 data lines and 2 clock lines

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The PCIE bus also has a clock request signal REQ

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This clock request signal is sent to the PCH

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When the PCH receives a low-level clock request signal,

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it will send out a clock signal through the corresponding clock line

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Next, let's find the network card in the circuit diagram

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Still the same, we first find the architecture diagram

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Find the network card in the architecture diagram

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It can be seen that the network card is controlled by the PCH

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Its model is I219V

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This is the network card

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Let's take a look at the pin position of the network card

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The first thing to look for is the power supply

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Power supply is provided by 3V

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These are 3V powered

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When the network card has a 3V power supply, there is an EN signal here

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The EN signal is active low

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With power supply and low-level EN, the network card will generate a voltage of about 1V by itself

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This voltage will come back to power the network card

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After the power supply is satisfied, the next step is the clock signal

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The clock is a 25M crystal oscillator near the network card

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This 25M crystal oscillator generally has a continuous waveform

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Next PCIE bus

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The PCIE bus has a total of 6 lines, including four data lines and two clock lines

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At the same time, the PCIE bus also includes the reset signal of PCIE and the clock request signal REQ

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Reset is the platform reset signal, generally from IO

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The REQ clock request signal should be given to the PCH

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The PCH will send out the clock of the PCIE bus only after receiving the low-level REQ

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Further down, here's a pair of SM buses

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We can leave it alone

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There is also a WAKE wake-up signal below

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This is to implement the wake-on-lan function

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If there is a problem with this pin, it may cause the computer to fail to shut down,

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shut down and restart automatically.

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There are also three LED signals below

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These three LED signals are the lights on the RJ45

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Further down, these two pins are grounded through resistors, we can ignore them

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There are 8 wires here on the right

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These 8 wires are the 8 wires from the network card to the RJ45 interface, which are used to transmit network data

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Well, the above is the introduction of the network card in the circuit diagram