Problems with Data Reception or Transmission - 4.1 English

GMII to RGMII Product Guide (PG160)

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4.1 English

When no data is being received or transmitted, ensure that a valid link has been established between the external PHY and its link partner, either by auto-negotiation or manual configuration. After the link has been successfully established, ensure that the driver software configures the core register 0x10 with correct values for speed.

Note:   By default, the speed is set to 10 Mb/s and the duplex mode to half-duplex.