Initialization

1. Write 1 to BUS_SELECT to select VME-bus access.
2. Write the required value for P to FIFO_INIT.
3. Activate reset by writing to ACTIVATE_RESET.
4. Set the interrupt vectors:
   1. write data FIFO-flag vector value to FIFO_INTRPT_REG,
   2. write NOSIGNAL vector value to NOSIGNAL_INTRPT_REG,
   3. write NODATA vector value to NODATA_INTRPT_REG,
   4. write control-char vector values to CNTRL_INTRPT_REG + 0, + 4, + 8, ...., + 60 (a total of 16 vectors);
      NOTE: with every write have data bit 8 set to 1 to enable this particular interrupt.
5. Deactivate reset by writing to DEACTIVATE_RESET.
6. Enable required interrupts by writing to INTRPT_CTRL_STAT_REG. (Write 7 to enable all 3 interrupt sources: NOSIGNAL, NODATA and control-char)
   (NOTE: the data FIFO-flag interrupt is enabled by inserting an onboard jumper, but probably this interrupt won't be used when control character interrupts are used, unless to detect an alarm situation ('FIFO too full')).