The diagram below depicts the signals for RGMII and MII respectively.

Figure: Ethernet RGMII and MII Signalling

RGMII is the default interface configured in SDK examples.
To configure MII interface follow steps captured below:
- Modify the following changes in CPSW example Syscfg-GUI

1. SOC Pinmux selection in 'Syscfg‑Gui → TI NETWORKING → Enet (CPSW) → CPSW Pinmux Config'

1.1. If 'Mac Port 1' is used, select MII from drop down against RMII(1)/RGMII(1)/MII(1).
1.2. If 'Mac Port 2' is used, select MII from drop down against RMII(2)/RGMII(2)/MII(2).

2. MII1 Pinmux selection in 'Syscfg‑Gui → TI NETWORKING → Enet (CPSW) → IO Set'

2.1. If 'Mac Port 1' is used, select MII1 from drop down against MII1.
2.2. If 'Mac Port 2' is used, select MII2 from drop down against MII2.

3. PHY Pinmux selection for "RX_ER" pin in 'Syscfg‑Gui → TI BOARD DRIVERS → ENETPHY (Enet CPSW/ICSS) → Extended Configuration'

Figure: Ethernet PHY RX_ER Pin config

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