Ethernet breaks after soft power cycle #18

sbourdeauducq opened this Issue Jun 9, 2011 · 1 comment


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How to reproduce:

  • Power on M1
  • In Flickernoise, click Shutown->Power off
  • Immediately press the middle pushbutton to power on again


  • Complete loss of Ethernet functionality
  • LEDs on the Ethernet connector are always on, even in the absence of a cable

Probably, the signals sent from the FPGA when reloading bitstreams confuse the PHY chip and make it enter a "broken" state. For some reason, the reset pulse which is supposedly sent immediately after the loading of the main bitstream fails to put the PHY back into a normal state. The problem goes away after a second soft system (and PHY) reset.

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