2 Replies Latest reply on Jul 28, 2016 9:57 AM by Intel Corporation

    Brawell PLTRST# Issue

    KevinChen

      Hi,

         There is a issue about PLTRST#. The platform is Braswell N3010 and TI PMIC (TPS650842). I do the power up without BIOS code, the power sequence seems to be good, but PLTRST# can't rise up after the VCCAPWROK & COREPWROK  asserted by PMIC, and lpc_clkout0 is low. Then i check the 19.2MHz crystal. I removed the C1&C2(both 18pF), and used the scope probe touch the OSCIN & OSCOUT pin several times, after that lpc_clkout0 outputs 19.2MHz clock wave at 3.3V amplitude and the PLTRST# rise up!  I reproduced this phenomenon 5-10 times, the number of probe touch times is different, it's hard to reproduce. What's the issue?

           the attached file is 19.2MHz OSCIN&OSCOUT scope shot.

      OSCIN:

      tek00031.bmp

      OSCOUT

      tek00032.bmp

       

      Thanks,

      Kevin