The Helicity Generator will operate at one of four timing selections.  
Three are fixed-frequencies of 30Hz, 60Hz, and 240Hz triggered by "Beam-sync". 
The phase locking is forced during the last T-stable period. The T-settle time 
period may be chosen from the T_SETTLE below values.

The fourth mode of operation allows the module to operate in free-running mode, 
where the T-settle and T-stable values are selected from the tables below.

In any of the four modes of frequency operation, the helicity pattern may be 
selected to provide three patterns: pair,quartet, and octal.

Delayed reporting of the random helicity output pattern is selectable by a table below.


T_SETTLE REGISTER
	  Five-bit R/W register that determines the "T_Settle" portion of
	  the helicity period.  The delay time selections are as follows:

		Settle Time				Settle Time

		 10 usec. (DEFAULT)			 20 usec.
		 30 usec.				 40 usec.
		 50 usec.				 60 usec.
		 70 usec.				 80 usec.
		 90 usec.				100 usec.
		110 usec.				120 usec.
		130 usec.				140 usec.
		150 usec.				160 usec.

		170 usec.				180 usec.
		190 usec.				200 usec.
		250 usec.				300 usec.
		350 usec.				400 usec.
		450 usec.				500 usec.
		550 usec.				600 usec.
		700 usec.				800 usec.
		900 usec.			       1000 usec.


T_STABLE REGISTER
	  Five-bit R/W register that determines the "T_Stable" portion of
	  the helicity period.  The stable time selections are as follows:

		Stable Time				Stable Time
																		
		400 usec. (DEFAULT)			500 usec.
		600 usec.				700 usec.
		800 usec.				900 usec.
	       1000 usec.			       1500 usec.
	       2000 usec.			       2500 usec.
	       3000 usec.			       3500 usec.
	       4000 usec.			       4500 usec.
	       5000 usec.			       5500 usec.

	       6000 usec.			       6500 usec.
	       7000 usec.			       7500 usec.
	       8000 usec.			       8500 usec.
	       9000 usec.			      10000 usec.
	      33330 usec.			      50000 usec.
	      75000 usec.			     100000 usec.
	     250000 usec.			     500000 usec.
	     750000 usec.			    1000000 usec.


REPORT DELAY REGISTER
	  Three-bit R/W register that determines the "delayed-reporting"
	  mode of operation.  The delay time selections are as follows:

	         Delay Time			        Delay Time

		 64 cycles			  	32 cycles
		 16 cycles			  	 8 cycles (DEFAULT)
    		  4 cycles			  	 2 cycles
    		  1 cycle			  	 no delay