regs/Ext_PHY_specific_control_reg


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   15        Block Carrier Extension Bit
   14        Line Loopback
   13        Powerdown
   12        Disable Link Pulses
   11:9      Downshift counter
   8         Downshift Enable
   7         RGMII Receiv Timing Control
 6:4        Default MAC interface speed
 3          Reserved
 2          DTE detect enable
 1          RGMII Transmit Timing Control
 0          Reserved