31 Rsvd
30 VME
29 Rsvd
28 TFCE
27 RFCE
   26      RST
25 :21     Rsvd
   20   ADVD3WUC
19 : 13    Rsvd
   12    FRCDPLX
   11    FRCSPD
   10      Rsvd
09 : 08  SPEED
   07   Reserved
   06     SLU
   05     Rsvd
   04     Rsvd
   03     Rsvd
   02     Rsvd
   01     Rsvd
   00      FD