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    178. PG and reset signals after triggering
    178. PG and reset signals after triggering
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    1

    00:00:01,700 --> 00:00:08,933

    In this lesson, let's look at the PG signal and reset signal required after the 100 series mainboard is triggered.

    2

    00:00:09,666 --> 00:00:12,200

    First is the PG signal

    3

    00:00:12,866 --> 00:00:17,266

    The first one is VCCST_PWRGD

    4

    00:00:17,433 --> 00:00:20,266

    Its voltage is generally 1.05V

    5

    00:00:20,933 --> 00:00:24,466

    It is a PG signal to the CPU

    6

    00:00:24,900 --> 00:00:31,600

    Under normal circumstances, the CPU will turn on the VTT power supply after getting VCCST_PWRGD

    7

    00:00:32,633 --> 00:00:34,900

    Next is PCH_PWROK

    8

    00:00:35,300 --> 00:00:38,500

    Its voltage is 3.3V

    9

    00:00:39,033 --> 00:00:42,433

    We can know from the name that it is a PG signal to the bridge,

    10

    00:00:42,533 --> 00:00:46,000

    which is used to indicate that the power supply of the bridge is normal.

    11

    00:00:47,733 --> 00:00:50,100

    Further down, PROCPWRGD

    12

    00:00:50,700 --> 00:00:53,600

    Its voltage is also 1.05V

    13

    00:00:53,800 --> 00:00:59,933

    It is a PG signal sent by the bridge to the CPU to indicate that the power supply of the CPU is normal.

    14

    00:01:02,400 --> 00:01:07,966

    Although the bridge sends the CPU PG signal to indicate that the CPU power supply is normal,

    15

    00:01:08,366 --> 00:01:11,500

    there is no CPU core power supply at this time.

    16

    00:01:13,000 --> 00:01:17,066

    Because the CPU core power supply needs to receive SVID to have it

    17

    00:01:17,266 --> 00:01:21,533

    At this time, the CPU has not issued SVID, and there is no CPU power supply.

    18

    00:01:22,666 --> 00:01:26,033

    The last PG signal is SYS_PWROK

    19

    00:01:26,600 --> 00:01:30,566

    It is also for the bridge, and the voltage is also 3.3V

    20

    00:01:31,266 --> 00:01:36,100

    This signal is an important condition for the bridge to generate a platform reset

    21

    00:01:37,300 --> 00:01:39,033

    Let's see reset

    22

    00:01:39,300 --> 00:01:41,233

    The first is PLTRST#

    23

    00:01:41,466 --> 00:01:43,600

    This is the platform reset signal

    24

    00:01:43,800 --> 00:01:46,833

    It is sent out by the bridge, it is 3.3V

    25

    00:01:47,033 --> 00:01:53,100

    Under normal circumstances, with the platform reset signal, it means that the hard boot is about to end.

    26

    00:01:55,600 --> 00:01:58,833

    Another one is PLTRST_CPU#

    27

    00:01:59,466 --> 00:02:05,200

    This is sent by the bridge to reset the CPU. It is the reset signal of the CPU.

    28

    00:02:05,500 --> 00:02:08,666

    Its voltage is generally 1.05V

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