****     RRIF Cmd/Status Reg      ****
**    FrontEnd Occupancy Counter    **
**       Dead Data Link Mask        **

/* DATA_LINK_MASK(msk)   */
--------------------------------------
DATA_LINK_MASK_O       0
DATA_LINK_MASK_W      32

**************************************
Each bit corresponds to a single link.
Bit 0 -> Link 0 : Bit 1 -> Link 1 etc.
0x1 = inhibit ; 0x0 = enable

The "msk" field selects the link set.
msk=0 : Links 31 to  0
msk=1 : Links 63 to 32
msk=2 : Links 95 to 64
**************************************