BOS_bank_FTBV (primitive dataflow)
  * Forward Trigger Big Tower Validation bank
  data is unpacked (B32), each bit corresponds
  to one big_tower.

  # word    type    contents
    1       B32     # of theta ranges (=16)
    2       B32     # of words per theta range (=1)
    3       B32     Big Tower bits (for ntheta = 1)  32 phi values
    .        .
    .        .
    9       B32     Big Tower Bits (for ntheta = 16) 32 phi values