1 Reply Latest reply on Aug 25, 2017 1:56 PM by Intel Corporation

    E38xx Boot into S4 Issue


      Hello we've being using the E3827 on our own custom PCB for a while now and are nearly into production stage. We're seeing the following issue on about 10% of our prototype systems:

      • The PMIC is providing all A Rails for G3 state. Regulation, noise and sequencing are all okay.
      • The Intel’s PMC clock is running and PMC_SUSCLK[0] output is at 32.768KHz
      • PMIC is waiting for SLP_S4_B to be asserted from the CPU however the CPU does not assert this line and the system is stuck and never goes into S4 state.


      The only way we can fix this is to force low the PMC_PWRBTN (J26) signal on the Intel CPU for a second or so. This fix only needs to be done once, after this the intel will boot every time with no intervention.

      There is no reference to the PMIC datasheet or the Intel datasheet to the PMC_PWRBTN signal during S4 transition.


      Has anyone seen this problem before?

      I could apply the above mentioned fix to the production FCT fixture but I would rather find the source of the problem.


      Thanks is advance,


        • 1. Re: E38xx Boot into S4 Issue
          Intel Corporation
          This message was posted on behalf of Intel Corporation

          : Thank you very much for joining the Intel® Processors communities. We are sorry to hear the processor is showing that behavior.

          In order to find out what might be the source of the problem, please visit our Intel® Embedded communities, in there you should fine further peer assistance on this matter:


          I also encourage all the peers in our communities viewing this forum, that if they have any information, feedback or suggestions on this subject to post all the details on this thread.

          Any further questions, please let me know.

          Alberto R