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1000BASE-T operation in RGMII mode, use the following sequence of register writes:
1. Write register 0x001F to 0x8000 to apply a software reset.
2. Write register 0x0000 to 0x0140 to force 1000BASE-T operation.
3. Write register 0x0032 to 0x00D3 to enable RGMII.
4. Write register 0x0016 to 0x0004 to enable digital loopback.
5. Write register 0x001F to 0x4000 to apply a software restart
