initial.mcs = first time FPGA program.  Includes Golden reference fall back image.
update.mcs =  for subsequent update of firmware on a previously programmed iDDS3. 


v1.1.30 =  1.0dBm output level
v1.1.30b = 1.5dBm output level
v1.1.30c = 1.0dBm output level, extended debounce on thermal INT
v1.1.30d = 1.5dBm output level, extended debounce on thermal INT 