• Learning center

    Index/
    183. SVID bus introduction
    183. SVID bus introduction
    82 person
    Collection
    Detail
    Comments

    1

    00:00:01,033 --> 00:00:06,433

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

    2

    00:00:06,633 --> 00:00:11,833

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

    3

    00:00:12,433 --> 00:00:18,800

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

    4

    00:00:19,333 --> 00:00:24,933

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

    5

    00:00:25,433 --> 00:00:31,366

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

    6

    00:00:31,833 --> 00:00:35,666

    and output the voltage currently required by the CPU.

    7

    00:00:36,600 --> 00:00:41,233

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

    8

    00:00:47,866 --> 00:00:51,733

    Clock and data lines are used to transmit data

    9

    00:00:52,366 --> 00:00:58,733

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

    10

    00:00:59,433 --> 00:01:04,233

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

    11

    00:01:04,833 --> 00:01:10,566

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

    12

    00:01:10,600 --> 00:01:17,033

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

    13

    00:01:17,400 --> 00:01:22,033

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

    14

    00:01:22,666 --> 00:01:26,266

    If the voltage is inconsistent, the CPU will not work

    15

    00:01:26,566 --> 00:01:29,800

    Its manifestation is that the CPU does not run code

    16

    00:01:30,166 --> 00:01:37,733

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

    17

    00:01:38,033 --> 00:01:44,400

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

    18

    00:01:44,600 --> 00:01:48,366

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

    19

    00:01:48,466 --> 00:01:52,633

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

    No comments yet
    Come and write your comments
    Video
    115. BIOS structure introduction
    ¥0.00
    38 people are learning
    Series of lessons
    LCD backlight screen circuit maintenance
    ¥0.00
    33 people are learning
    Video
    167. Intel 6th~9th Power supplies generation seque
    ¥0.00
    40 people are learning
    Video
    354. I2S bus from baseband to CPU of iPhone 12 12 Pro
    ¥0.00
    37 people are learning
    Video
    192. Network card introduction
    ¥0.00
    82 people are learning
    Next lesson
    Video
    168. iPhone battery replacement- New battery welding
    61 people are learning
    Links：