First reset signal on computer, how to work !

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  • highpulse
    i hate HP
    • May 2013
    • 1488
    • portugal

    #1

    First reset signal on computer, how to work !

    FIRST RESET SIGNAL ON COMPUTER CIRCUIT
    RSMRST#
    When the Power,Bios,Ec are OK, the RSMRST# will go Hi. In the other word,this pin go Low only when the systemreset.If BIOSdata is error,RSMRST# won't go HI.
    When SIO(EC) get +V_RTC
    thecrystal will work.
    1. RTC have to be oscillating(32.768KHz).
    2. RTCRST# have to be high.
    3. RSMRST# have to be inactive (high).
    4. PWRBTN# have a trigger.
    5. LOW_BAT# have to be inactive (high).
    If this 5 present, then EC will issue SLP_S3# /SLP_S5, in the old ICH SLP_S3 and SLP_S5 will generate directly to ICH.
    When All+V?S/+V? powers are ready, PWR_GOOD will tie to high to turn on CPU powers(+VCCP and +VCC_CORE).
    SB/PCH Power good--->SB/PCH pwr_btn--->PCH RUN
    SUSB# from PCH toSIO pull up the signal SLP_S3# The signal is used to shut power off /on through logic gate transistor or IC
    SUSC# from PCH to SIO pull up the signal SLP_S5# The signal is used to shut power off /on through logic gate transistor or IC
    ICH/SB,MCH & CPU Signal Checking
    IMVP_PWRGD => CLK_ENABLE# => RESET_OUT#=> ICH_PWRGD => PLTRST# => PCI_RST=> H_PWRGOOD
    CPU generate the first cycle to read the BIOS code
    CPU bus DMI LPC SPI
    CPU ===> GMCH===> ICH===>SIO ===> BIOS
    CPU MASTER POWER
    VR_ON Enable--->+VCCORE 08VS to 1,5VS
    Memory +VTT and +V1.5VS (DDR3) is ok, the PGOOD VTT_PWRGD pull high to CPU first than ICH will tie H_PWRGD to high ,then NB will tie CPURST# to reset CPU.
    Crystal clock Oscilator CLOCK SUMMARY
    (1) 32.768KHz to SIO Required +V_RTC and to ICH(chipset) also Required +V_RTC
    (2) 49.152MHz to (audio controller) Required +V3S
    (3) 27MHz to Graphic chip (video controller )Required +V3S
    (4) 14.318MHz to (clock Generator) Required +V3S
    Make sure crystal is oscillating for EC(SIO),SB/ICH/PCH and VGA or it will no post
    Clock Generator
    Elementary required
    1) Power : +V3S
    (2) Crystal : 14.318MHz
    (3) Control : PCISTOP# , CPUSTOP#_ is HI
    When +VCC_CORE is ready, CLKEN#will go high to enable clock-Generator and turn all clock.
    PCI_STOP# and CPU_STOP# must beat high otherwise some clocks will be turned off.
    Clock out -->SIO(EC)-->PCH/SB-->NB-->CPU
    LPC_Frame-->SB output signal is high
    Note High signal can be identified by measuring 3.3V available
    Power by experiences of adiedkhaz
  • shijeesh
    Senior Member
    • Mar 2011
    • 65

    #2
    Re: First reset signal on computer, how to work !

    Highpulse thanks . It is very useful to all. Please upload other topic

    Comment

    • highpulse
      i hate HP
      • May 2013
      • 1488
      • portugal

      #3
      Re: First reset signal on computer, how to work !

      always i got a nice subject i usually post ,

      Comment

      • ala_borbe
        aka Donald
        • Apr 2011
        • 1625
        • Malta

        #4
        Re: First reset signal on computer, how to work !

        ty im a noob at this stuff.. nice guide, tnx
        Im Back... sort of...

        Comment

        • highpulse
          i hate HP
          • May 2013
          • 1488
          • portugal

          #5
          Re: First reset signal on computer, how to work !

          sure mate , we are for help , this is not from myself , credits goes to the name below the following infos.

          Comment

          • Ramee
            Badcaps Veteran
            • Jul 2014
            • 218
            • Israel

            #6
            Re: First reset signal on computer, how to work !

            Here is the link, found it.
            http://adiedkhazbook.blogspot.com

            Comment

            • Siddig
              Badcaps Veteran
              • Jun 2017
              • 264
              • Sudan

              #7
              Re: First reset signal on computer, how to work !

              Good. Thanks

              Comment

              • Techtiger
                Badcaps Legend
                • Oct 2014
                • 1601
                • france

                #8
                Re: First reset signal on computer, how to work !

                Thanks

                Comment

                • Lapy
                  Member
                  • Dec 2018
                  • 15
                  • algeria

                  #9
                  Re: First reset signal on computer, how to work !

                  Many thanks

                  Comment

                  • charafmak77
                    Senior Member
                    • Oct 2017
                    • 81
                    • jijel

                    #10
                    Re: First reset signal on computer, how to work !

                    thanks

                    Comment

                    • gmacz
                      Member
                      • Jun 2018
                      • 37
                      • Sri Lanka

                      #11
                      Re: First reset signal on computer, how to work !

                      Thank you very much Sir.

                      Comment

                      • Gau_saha
                        Member
                        • Feb 2020
                        • 35
                        • India

                        #12
                        Re: First reset signal on computer, how to work !

                        Thanks Sir ��

                        Comment

                        • bhaskar
                          Member
                          • Nov 2015
                          • 12
                          • India

                          #13
                          Re: First reset signal on computer, how to work !

                          what about slp s3 and slp s5

                          Comment

                          • danro
                            Senior Member
                            • Aug 2011
                            • 50
                            • Serbia

                            #14
                            Re: First reset signal on computer, how to work !

                            very interesting and useful post
                            thank you!

                            Comment

                            • aaabddoo
                              Member
                              • Nov 2021
                              • 17
                              • egypt

                              #15
                              Re: First reset signal on computer, how to work !

                              thank you

                              Comment

                              • mitu_sharma
                                Senior Member
                                • Jul 2015
                                • 182
                                • india

                                #16
                                Re: First reset signal on computer, how to work !

                                wow thanks

                                Comment

                                • mmccomputer
                                  Senior Member
                                  • Jan 2018
                                  • 71
                                  • France

                                  #17
                                  Re: First reset signal on computer, how to work !

                                  big thanks bro

                                  Comment

                                  • kalilinux25
                                    Badcaps Legend
                                    • Mar 2018
                                    • 2069
                                    • ZAMBOANGA SIBUGAY

                                    #18
                                    Re: First reset signal on computer, how to work !

                                    32.768KHz if missing what might it be the prolem?

                                    Comment

                                    • Gau_saha
                                      Member
                                      • Feb 2020
                                      • 35
                                      • India

                                      #19
                                      Re: First reset signal on computer, how to work !

                                      Thanks Sir

                                      Comment

                                      • kofe
                                        Member
                                        • Sep 2013
                                        • 32
                                        • Estonia

                                        #20
                                        Re: First reset signal on computer, how to work !

                                        Thank you very much!

                                        Comment

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