1 Reply Latest reply on Jul 13, 2016 8:39 AM by MichaelF_56

    BCM53128IQLE

      We use the BCM53128IQLE in unmanaged mode using the reference schematic BCM53128R_Eval_Schem. At power on, the LNK/ACT leds light for approx. 1 second and then turn off and then operate as expected when an Ethernet cable is plugged in (LED comes on when a cable is plugged in and blinks off when activity is detected). On some boards, a LNK/ACT led remains on after power on and then operates in reverse when a cable is plugged in - it goes off when a cable is plugged in and blinks on when activity is detected.

       

      I assume that a power-on selftest operates and is showing something wrong, but I can't find anything in the data sheet that explains this. What is this LNK/ACT led indicating?

       

      Regards.