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Ddr3/ddr4 ram section voltage requirements(working)

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    #1

    Ddr3/ddr4 ram section voltage requirements(working)

    Follow this guide to verify voltage at RAM SECTION


    DDR 3 ram section voltage check list at ram slot

    DDR3 operating voltage VDD (at coil )= 1.5V PINs 75,76 ram slot

    VRef_DQ = 0.75 V at PIN 1
    VTT/Termination voltage= 0.75V PINs 203,204

    VRef_CA. = 0.75V PIN 126
    VDD SPD = 3.3V PIN 199
    SDA data = 3.3V PIN 200
    SCL clock = 3.3V PIN 202
    DRAM_RST# = 1.5V PIN 30

    ±+++++++++++++++++++++++

    DDR 3L ram section voltage check list at ram slot

    DDR3L operating voltage VDD (at coil )= 1.35V PINs 75,76 ram slot

    VRef_DQ = 0.67 V at PIN 1
    VTT/Termination voltage= 0.67V PINs 203,204

    VRef_CA. = 0.67V PIN 126
    VDD SPD = 3.3V PIN 199
    SDA data = 3.3V PIN 200
    SCL clock = 3.3V PIN 202
    DRAM_RST# = 1.35V PIN 30



    ±+++++++++++++++++++++++++++++


    DDR4 ram section voltage check list at ram slot

    DDR4 operating voltage VDD (at coil )= 1.2V PINs 12,33,75 of ram slot

    VTT/Termination voltage= 0.5V PIN 258

    VRef_CA. = 0.5V PIN 164
    VDD SPD = 3.3V PIN 255
    SDA data = 3.3V PIN 254
    SCL clock = 3.3V PIN 253
    DRAM_RST# = 1.2V PIN 108


    In case of any mistake please notify

    Thanks
    Tags: None
    #2
    Re: Ddr3/ddr4 ram section voltage requirements(working)

    VTT is half VDDQ, for DDR3L VDDQ = 1.35V so VTT = 0.675V, and for DDR4 VDDQ=1.2V so VTT=0.6V.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

      #3
      Re: Ddr3/ddr4 ram section voltage requirements(working)

      Oh my mistake yes I knew it is half but wrote 0.5 lol

      Anyhow thanks

      Correction DDR4 :0.6 not 0.5
      Ddr3l is ok 0.67 in general

      Comment

        #4
        Re: Ddr3/ddr4 ram section voltage requirements(working)

        Will help a lot of beginners.

        Comment

          #5
          Re: Ddr3/ddr4 ram section voltage requirements(working)

          I have to search it every time

          Can we fix this thread

          Comment

            #6
            Originally posted by stingerchamp View Post
            Follow this guide to verify voltage at RAM SECTION


            DDR 3 ram section voltage check list at ram slot

            DDR3 operating voltage VDD (at coil )= 1.5V PINs 75,76 ram slot

            VRef_DQ = 0.75 V at PIN 1
            VTT/Termination voltage= 0.75V PINs 203,204

            VRef_CA. = 0.75V PIN 126
            VDD SPD = 3.3V PIN 199
            SDA data = 3.3V PIN 200
            SCL clock = 3.3V PIN 202
            DRAM_RST# = 1.5V PIN 30

            ±+++++++++++++++++++++++

            DDR 3L ram section voltage check list at ram slot

            DDR3L operating voltage VDD (at coil )= 1.35V PINs 75,76 ram slot

            VRef_DQ = 0.67 V at PIN 1
            VTT/Termination voltage= 0.67V PINs 203,204

            VRef_CA. = 0.67V PIN 126
            VDD SPD = 3.3V PIN 199
            SDA data = 3.3V PIN 200
            SCL clock = 3.3V PIN 202
            DRAM_RST# = 1.35V PIN 30



            ±+++++++++++++++++++++++++++++


            DDR4 ram section voltage check list at ram slot

            DDR4 operating voltage VDD (at coil )= 1.2V PINs 12,33,75 of ram slot

            VTT/Termination voltage= 0.5V PIN 258

            VRef_CA. = 0.5V PIN 164
            VDD SPD = 3.3V PIN 255
            SDA data = 3.3V PIN 254
            SCL clock = 3.3V PIN 253
            DRAM_RST# = 1.2V PIN 108


            In case of any mistake please notify

            Thanks
            HI, very useful information that you put here, BUT, you have mistake pin number for VREF_CA on DDR4. Is pin 146 VREF_CA, and you write pin 164.
            Hope you can correct this for use of others in this great forum. The info itself is very very useful. thanks a lot for that.

            Comment

              #7
              VRef_CA is pin 146 not 164 friend.

              Comment

                #8
                254 pin is ground ,SDA data = 3.3V Pin :285 and SCL clock = 3.3V PIN 141 not 253

                Comment

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