CAL_FHE: CAL High-Energy threshold register settings

The CAL_FHE precinct controls high-energy (nominally 1 GeV) thresholds for generating CAL trigger requests.

• Registers:
  

  Group	Register Name	Instances	Multiplicity	Subsections	Type	Width (bits)
  CFE	fhe_dac	16 x 4 x 4 x 12	1	1	mask	16

• Methods: BCAST | CALIB | SETTINGS
  SETTINGS uses an ancillary file to set all the registers. CALIB uses an ancillary calibrations file and constants to set all the registers.
• Ancillary files:
  CAL_FHESettings
• Constants:
  FHE_MeV: Low-Energy trigger threshold energy in MeV.