DP83867E: DP83867E

Rajagopal Varhabhatla

Part Number: DP83867E

What is the config pin setting I need to use for RGMII, Autoneg enable?

Xilinx Ref design used:Rx_Ctrl= 1k PD, RX_D0=1k PD and Rx_D2=1k PU. All others are DNP.

It is working LWIP Echo example.

Same settings I used and it is not working.

What settings I use?

Raja

0 Cecilia Reyes over 5 years ago

Hi Raja,

Are you using the same reference design or is this a different design and schematic?

Thanks,

Cecilia

0 Rajagopal Varhabhatla over 5 years ago in reply to Cecilia Reyes

Cecilia

I am using Xilinx Z106 Eval Board and Our product board for comparision.

I tried to duplicate the Xilinx Eval board settings which do not match Spec values/settings, but Xilinx board works.

Our board with same settings did not work. Always getting "Auto-negotiation failed" error.

I also tried RX_CTRL strap 5.76K PU & 2.49K PU - it also giving same error.

I need to enable Auto-negotiation.

Raja

0 Cecilia Reyes over 5 years ago in reply to Rajagopal Varhabhatla

Hi Raja,

On RX_CTRL, you need to strap to Mode 3 to enable Auto Neg

Please review Figure 21 of the strap circuit. To select Mode 3, you need Rhi = 5.76k and Rlo = 2.49k.

Let me know if you have further questions.

Thanks,

Cecilia

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