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Altera_Forum
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15 years ago

Gigabit ethernet auto-negotiation fails

Hello,

I am currently starting up my new board which has a Cyclone4 and a Micrel KSZ9021RL PHY. The problem is that I can't get the auto-negotiation working. If I disable auto-neg and force the speed to 10MBPs then there is a connection to my PC.

When I read the MIIM registers then I notice (with auto-neg enabled) that the 'link partner auto-negotiation able' bit is toggling. I think that the auto-negotiation algorithm is restarting all the time.

Has anybody had similar problems? In the forum I found one post of somebody having a similar problem but he used the wrong magnetics, I am using the magnetics advised in the datasheet (H5007NL).

thanks and best regards,

Karel

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    Hello,

    I am encountering the same problem. Were you able to solve the issue and are you willing to share the solution?

    Thanks in advance,

    Bert