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Buck0623's avatar
Buck0623
Icon for New Contributor rankNew Contributor
3 years ago

Ethernet Phy Fails to Link Between Marvell 88E111 PHY and Downstream port

I cannot seem to get a simple Marvell 88E111 PHY design to link to any external Ethernet port. Designing a prototype system with a Xilinx Ultra Scale FPGA. Embedded microprocessor only loaded with U-...
ZiYing_Intel's avatar
ZiYing_Intel
Icon for Frequent Contributor rankFrequent Contributor
3 years ago

Hi Per Moberg,

According to the 88EE111 Datasheet, I found that in HWCFG_MODE[3:0] ’0000’, ’0100’, ’1000’, and ’1100’, RXD[3:2] can be used to indicate the copper link status. In this mode the LED_LINK10, LED_LINK100, and LED_LINK1000 pins cannot be used to indicate copper link status because the LED_LINK10, LED_LINK100, and LED_LINK1000 toggle during configuration.The RXD[3:2] pins must strictly indicate copper link status and not mirror the LED output. The link status will be real time status.

The definition of RXD[2] is 1 = Copper link down, 0 = Copper link up. The definition of RXD[3] is 0 = Copper link down, 1 = Copper link up.

In my opinion, you may try change the HWCFG_MODE[3:0] to the mode that can be used to indicate the copper link status and change the RXD[3:2] pins.

If above suggestion still not work, please do try to debug the problems according to the solution provided in below:

  1. Please do ensure the cable is connected correctly.
  2. Please do check whether you are using DHIP or static IP in your pc. If you are using DHCP, please try use a Static IP.
  3. Please try adding a 100 clock cycle delay till drive the ethernet PHY reset line high when the board lights up.

Best regards,

Zi Ying