15:14      Transmit FIFO Depth
     13:12      Receive FIFO Depth
     11         Assert CRS on Transmit
     10         Force Link Good
     9:8        Energy Detect
     7          Enable Extended Distance
   6:5       MDI Crossover Mode
   4         Disable 125CLK
   3         MAC Interface Power Down
   2         SQE test
1 Polarity Reversal
0 Disable Jabber