	191 Fast Digitizer Card Front End Support

     Names shown are for the test E17 flying wire.


			SSDNs
			-----

     All SSDNs have the same first 4 bytes, and a code in the fifth byte,
 to wit:

		+-------------------------------+
		|   14 (hex)    |   FF (hex)	|
		+-------------------------------+
		|     slot      |    crate	|
		+-------------------------------+
		|      0        |    code	|
		+-------------------------------+
		|		0		|
		+-------------------------------+


     The devices, codes, and properties supported this SSDN are as follows:

      CODE  NAME	DESCRIPTION		PROPERTIES SUPPORTED
      ----  ----	-----------		---------- ---------

	1   E17WCS	Status & Trig. Control	read -- 1 word,		f6  a1
						set -- 1 word,		f17 a9
						bstat -- 1 word,	f1  a0
						bctrl -- 1 word		f9  a0  *only reset supported*
	2   E17WTD	Trigger delay		set -- 1 word		f18 a9
	3   E17WSP	Sample Period		set -- 1 word		f19 a9
	4   E17WCC	Clock decoder config.	set -- 1 word		f19 a1
	5   E17WDT	Time stamp array	read -- 2048 words	f0  a9	(repeated)
	6   E17WD0	Channel 0 data		read -- 2048 words	f0  a10 (repeated)
	7   E17WD1	Channel 1 data		read -- 2048 words	f0  a11 (repeated)
	8   E17WD2	Channel 2 data		read -- 2048 words	f0  a12 (repeated)
	9   E17WD3	Channel 3 data		read -- 2048 words	f0  a13 (repeated)



     E17WCS Basic Control supports only the module reset function.  To
do this you transmit a word with the value 3.

     The large array devices should be read and written in chunks of no
larger than 192 words.  You always set the offset to zero in the call
to DPREQ and do one shot reads.  Every time you read you get the next
chunk of buffer.  Thus to read 512 words you issue 4 one shot 128 word
reads.

     The buffer read pointers are reset after every trigger, so you need
to make shure that the trigger has occurred before your read them.

