ADAPTIVE  OPTICS  PAL  CHANGES

New PALs have been developed for adaptive optics work. They are also fully
compatible with normal imaging work. They are Rev. 4.1, and are contained
in file timFOU17R41.jed and timFOU12R41.jed. They are described as follows - 

Fiber optic timing board PAL U17 - 

	pin #4 = FD15 = forced data bit 15 
	pin #7 = FMODE = forced data mode 
	pin #32 = WW = word width, either 16- or 32-bits

If FMODE = 1 and WW = 1 then we're in forced data mode, and 

	D15 (out) = FD15
	D0-D14 (out) = D0-D14 (in)
	and if D15 (in) = 1 then D0-D14 (out) = 1

If FMODE = 0 and WW = 1 we're in normal image mode, and 
	
	D0-D15 (out) = D0-D15 (in)

If WW = 0 then we're in 32-bit command and reply mode, and
	
	D0-D23 (out) = D0-D23 (in)



Summary of signal definitions - 

	If WW = 0 serial data word width is 32-bits 
	if WW = 1 serial data word width is 16-bits

	If FMODE = 0 all serial data follows the input pins D0-D23
	IF FMODE = 1 and WW = 1 serial data bit D15 is forced to FD15
		and if input data D15 = 1 then all serial data bits
		D0 to D14 are set to 1 and serial data bit D15 is still
		forced to FD15

	FD15 is the data value the serial data word bit D15 will be 
		assigned to if FMODE = 1 and WW = 1



	
Sample DSP code for using this capability is shown for the RDCCD routine - 

; Set the frame sync high at the beginning of the frame readout
	BSET	#FD15,X:PBD	; Force D15 = 1
	MOVEP	X:ONE,Y:WRFO	; Transmit D0 = 1 to fiber optic
	BCLR	#FD15,X:PBD	; Force D15 = 1

......Then there is readout code for one frame.......

; Clear the frame sync at the end of the frame readout
	REP	#20		; Wait for the last pixel transmission
	NOP
	BSET	#FD15,X:PBD	; Force D15 = 1
	MOVEP	X:ZERO,Y:WRFO	; Transmit D0 = 0 to fiber optic
	BCLR	#FD15,X:PBD	; Force D15 = 0
	REP	#10		; Wait for the last pixel transmission
	NOP