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    #1

    What is SPI_CLK?

    Sir, what is SPI_CLK? And What is the purpose of this signal?
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    #2
    Re: What is SPI_CLK?

    on what?
    Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

    "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

    Excuse me while i do something dangerous


    You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

    Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

    Follow the white rabbit.

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      #3
      Re: What is SPI_CLK?

      http://en.wikipedia.org/wiki/Serial_..._Interface_Bus
      Without clock signal there will be no data transfer between master and slave.
      (EC can't read bios from SPI flash).

      Comment

        #4
        Re: What is SPI_CLK?

        Originally posted by goontron View Post
        on what?
        on my laptop motherboard.. acer aspire v5.. the bios ic pin no. 6 show that it has SPI_CLK.. but it is not present.. the problem of the motherboard is no power.. what is the cause?

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          #5
          Re: What is SPI_CLK?

          What bios, EC or main? If main, maybe it will not need to be powered before power button pressed. If EC bios, then need to find why 3V ALW not present on EC.
          SPI_CLK will be present only when data is moving, if EC will be read once, then after reading there does not have to be signal on SPI_CLK before power is cycled again.

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            #6
            Re: What is SPI_CLK?

            Originally posted by khaahk View Post
            What bios, EC or main? If main, maybe it will not need to be powered before power button pressed. If EC bios, then need to find why 3V ALW not present on EC.
            SPI_CLK will be present only when data is moving, if EC will be read once, then after reading there does not have to be signal on SPI_CLK before power is cycled again.
            here is the photo sir
            Attached Files

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              #7
              Re: What is SPI_CLK?

              From shematic seems only one BIOS, EC might be already preprogrammed.
              Does the bios have vcc? If not then no need for SPI_CLK also.
              Does the EC (U2701) have 3.3v on pin 19?

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                #8
                Re: What is SPI_CLK?

                SPI is a 3 wire communication protocol, similar to i2c. There's a clock wire and a couple of data wires (one for input, one for output)

                Basically, each time signal goes high/low (change in the state) on the clk wire, the chip makes something available on the data wire or reads what's present on the wire (one bit).

                These chips can work at up to 75-100 Mhz (if you have a cheap scope you may not even detect signal on that clk pin) so it's possible the bios chip is read into memory in a second or so at boot and from that point you won't notice any signals on those pins.

                Here's a datasheet for some random flash spi based chip (16 mbps, very common) :

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                  #9
                  Re: What is SPI_CLK?

                  Originally posted by khaahk View Post
                  From shematic seems only one BIOS, EC might be already preprogrammed.
                  Does the bios have vcc? If not then no need for SPI_CLK also.
                  Does the EC (U2701) have 3.3v on pin 19?
                  EC (U2701) 3.3v on pin 19 is present sir..

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