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    173. Standby conditions of different series of PCHs
    173. Standby conditions of different series of PCHs
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    Hello everyone, in this lesson we will take a look at the standby conditions of different series of PCHs

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    The standby conditions of the Intel series are basically the same

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    First is the 8/9 series

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    The difference between 8/9 series and 100/200 series is that

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    there are more INTVRMEN# and DSWVRMEN# in the RTC circuit

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    They are all directly pulled up by VCCRTC

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    When we repair the 8/9 series without triggering the fault, if there is no drawing,

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    these two signals do not need to be measured

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    Further down, the 8/9 series does not have VCCPRIM_3P3, but there is a VCCSUS3_3

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    This VCCSUS3_3 is also the main standby of the PCH

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    100/The 100/200 series is the series we focused on before

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    Let's look at the 300 and 400 series

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    There is not much difference between them and the 100/200 series, only one more VCCPRIM_1P8 power supply

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    In other words, the PCH of 300 series and above will have an additional 1.8V power supply when it is in standby

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    At the same time VCCPRIM_1P0 was renamed VCCPRIM_1P05

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    This change is very small, we can leave it alone

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    Just remember this VCCPRIM_1P8

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    Finally look at the 500 series

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    Compared with the 300 and 400 series, the 500 series has one more power supply VCCIN_AUX

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    It is also generally 1.8V

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    This power supply is required during standby

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    These are the standby conditions of different series of PCH

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    These are the standby conditions of different series of PCH

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    If the mainboard uses the ESPI bus, then in standby mode,

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    in addition to the listed standby conditions, the PCH also needs to read the ME in the BIOS,

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    and the 24M clock needs to start

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