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TLK106: Duplex configuration through MDIO

Part Number: TLK106

Hi,

Working with Phy TLK106L, we want to use it as full-duplex mode, the datasheet explain to force full-duplex mode with a 2.2kΩ pull up to AN_0 (led link), but our board design did not include this. So we want to force full-duplex mode with the MDIO comms, but we did not succeed. To force full-duplex we try to disable auto-negotiation forcing to 0 the bit 12 of register BMCR (0x0000) and forcing full-duplex with bit 8 of the same register (BMCR) but the phy did not apply this configuration.

How we can change the duplex of the Phy without changing the board design?

Thanks