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Hello everyone, in this lesson we will talk about some explanations of the power-on part of the hard start

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The power-on part refers to the part

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where the power supply starts to be generated after pressing the power button

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VDIMMs first

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This refers to memory power supply

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Memory power supply includes VDDQ memory main power supply 1.2V, VPP 2.5V,

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and VCCPLL_OC power supply 1.2V

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VCC refers to some other power supply on the mainboard

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For example, secondary power supply 3 5V, bus power supply VCCIO, VCCST and VCCPLL, 1.0V, etc.

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Further down VCCST_PWRGD

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This is a signal of a good power supply, which means that

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the VCCST power supply or other power supplies are normal.

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This signal is generally sent to the CPU, usually around 1V

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Next is DDR_VTT_CNTL

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This is a VTT power supply start signal sent by the CPU after receiving VCCST_PWRGD,

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which is used to turn on the 0.6V VTT power supply of the memory.

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Further downVCCSA

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This is a power supply for the CPU, usually 1.05V