quoted

I also wonder about bits 15:12 of PHY EXT ODH: Delay and driver
strength CFG register.

The default value *works*, and from an emi perspective we want the
lowest strength single that is reliable.

I was not meaning signal strength, but Txc_delay_sel_fe,

  selecte tx_clk_rgmii delay in chip which is used to latch txd_rgmii
  in 100BT/10BTe mode. 150ps step. Default value 15 means about 2ns
  clock delay compared to txd_rgmii in typical cornor.

[Typos courtesy of the datasheet, not me!]

This sounds like more RGMII delays. It seems like PHY EXT 0CH is about
1G mode, and PHY EXT 0DH is about 10/100 mode. I think you probably
need to set this bits as well. Have you tested against a link peer at
10 Half? 100 Full?

   Andrew

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