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DP83TG720R-Q1: Need more information about reg 0x056A

Part Number: DP83TG720R-Q1

Can you please provide documentation for the bits in reg offset 0x056a? Referencing this appnote and the Linux driver for DP83TG720, we see references to reg 0x056A but this register is not documented in the datasheet. The customer has been able establish a link but it is only 10BaseT and they're trying to achieve 1G Link.