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    183. SVID bus introduction
    183. SVID bus introduction
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    1

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    Hello everyone, in this lesson we will briefly introduce the SVID bus

    2

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    The SVID bus is a bus between the CPU and the CPU power chip

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    Its function is to allow the CPU to control the output voltage of the CPU power supply chip

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    The CPU needs a specific power supply voltage and power supply voltage curve when it is working

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    During normal operation, the CPU will control the CPU power supply chip through the SVID bus in real time,

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    and output the voltage currently required by the CPU.

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    The SVID bus has three lines, CLK, DATA, ALERT

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    Clock and data lines are used to transmit data

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    And ALERT is a warning, used to notify the processor that the voltage change is normal or wrong

    10

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    We need to know that the CPU is very strict about CPU power supply

    11

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    If the power supply voltage required by the CPU is inconsistent with the actual power supply voltage

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    For example, the CPU sends out a voltage of 1.05V through the SVID bus,

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    and the power supply chip sends out a voltage of 1.1V

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    If the voltage is inconsistent, the CPU will not work

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    Its manifestation is that the CPU does not run code

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    And the SVID bus generally uses 1V pull-up, and there is usually a pull-up resistor in the middle

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    If there is a problem with the pull-up resistor, even if the resistance value of the resistor is wrong,

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    it may cause the data transmitted by the SVID to be wrong,

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    which will cause the CPU to not work and cause a code failure.

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