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15
1
Long Mode
The second word is a modifier word, detailing the mode of readout to be performed or the
nature of the data to be read. Depending on which bits in the second word are set, a number
of additional words, if any, will follow. The continuation bit (bit 15) of the second word is set
whenever additional data are to follow. The structure of the modifier word is as follows:
14-15
12-13 11
U
NT
Where the individual bits have the following meaning:
HD
Hit Data - identifies the data as a 16-bit hit register data (coincidence register data), to
be used for the conditional readout of subsequent CAMAC modules. The hit register
must be the first module to be read out, i.e., the HD bit may be set only in the first
word of the CAMAC readout stack (CDS).
S2
When set, S2 strobe is suppressed, the CAMAC cycle ending at the end of S1
ND
Numbers Data - identifies the data as representing the number of times the next
command in stack has to be performed.
HM
Hit Mode - instructs the NAF Generator to condition the readout with the content of
the hit pattern read in the first command of the stack (first command in an event). The
Number of Product Terms used to condition the readout must be specified as well.
QS
Q-stop mode – the command is to be repeated as long as Q=1 (Q response from the
addressed CAMAC module), but not more than the number specified in the following
stack line..
AS
Address Scan – the command is to be repeated a number of times specified in the
following word of the stack, with A incremented by 1 each time.
RM
Repeat Mode – repeat command a number of times specified in the following stack
line.
LM
LAM Mode – wait for LAM, subject to LAM Timeout and perform the readout only
when LAM is set.
FC
Fast CAMAC Mode – perform the readout in Fast CAMAC mode a number of times
specified in the following stack line.
AP
Address Pattern Data – identifies the data as an address pattern to be used in
conjunction with the command that follows. The subsequent command will be
repeated for every address for which the bit is set in the address pattern data word.
NT
Number of Product Terms – specifies the number of words in the stack that follow
and that constitute bit masks for constructing a logical equation used in deciding
whether the given operation is to be performed for the particular hit register data.
WIENER, Plein & Baus GmbH
14
9-13
N
9
8
U
AP
FC
5-8
A
7
6
5
LM RM
AS
QS
19
0-4
F
4
3
2
HM
ND
www.wiener-d.com
1
0
S2
HD
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