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Hello everyone. In this lesson, let's take a look at some signal interpretations of the hard start PG part.

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The PG part refers to the part where the mainboard starts to generate the PG signal

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after the power supply is generated during the power-on process.

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The first one is PCH_PWROK

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It is the power good signal for the bridge

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This signal is a 3.3 volt high level sent by the mainboard to the bridge,

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generally used to indicate that the voltage in the S0 state is normal

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Next is the 24 mega clock

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This is the bridge's 24M clock

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When the power supply of the bridge and PCH_PWROK are normal, the 24M clock of the bridge will start to work

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It鈥檚 used to provide a reference frequency for the clock module inside the bridge

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Next, the bridge will send out various clocks

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When the bridge gets the 24M clock and PCH_PWROK, it will read the program to configure its own pins

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When the pin configuration is complete, it will send out each clock

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Next SYS_PWROK

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SYS means system

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PWROK, good power

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Then its name together is the system power good signal.

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This signal is used to indicate that the system power supply is normal, generally 3.3 volts

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Further down there is a PROCPWRGD

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It is a good signal for CPU power supply, usually 1.05 volts

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This signal is generally sent to the CPU by the bridge to indicate that the voltage of the CPU is normal.

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These are the noun explanations for some signals in the PG part of the hard start