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Altera_Forum's avatar
Altera_Forum
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13 years ago

How to enable tx_clk of the 88e1111

Dir Sir,

I'm using Cyclone III development kit. I want using Ethernet IP with mii standard to transfer data via Ethernet. and I want using 100Mbs standard. However, this kit not support tx_clk from PHY 88E1111. If I want to use 100Mbps, what should I do? I also buy a HSMC-NET of terasic, then I connect this this with Cyclone III via HSMC port. I used tx_clk for my Ethernet. however, tx_clk is not active clock. How to enable clock this pin from PHY 88e1111?

Thank you so much.

6 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Check if You really have all required wires connected to do MII connection. Maybe there are only wires for RMII?

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Thank you for your help,

    I double-checked connect. only have got 2 types are MII and GMII, not RMII.
  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Then MII should work fine. Are You forcing 1Gbit network to work on 100Mbps? Did You tie 1000Mbps setting in MAC to '0'?

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    I only want working on 10/100Mbs. therefore, I need 2 clock are tx_clk and rx_clk for the Ethernet-mac. I also built the system on Stratix III kit. However, when i plug Ethernet cable the rx_led and tx_led are not blinking. I's using signal-tab to capture enet_tx_clk and enet_rx_clk are not oscillate

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Check PHY reset signal, is it high? Did You implement reset bug-fix? Check 88E1111 PDF for proper PHY initialization setup. You need to de-assert reset at required time.

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Ok, I checked reset signal and I fixed this pin. Now, the rx_led was blinking. However, when I'm using signal-tap the rx_clk and tx_clk ware not oscillite. please help me :(