CAEN
Electronic Instrumentation
UM3148
–
DT5730/DT5725 User Manual rev. 2
34
▪
a
pulse of configurable width
(see
Fig. 9.12
). The width parameter can be set at register address 0x1n70.
CH0 IN
THRESHOLD
pulse [0]
WIDTH
Fig. 9.12:
Channel pulse signal
The FPGA, by register address 0x1n84, can be programmed in order the trigger request for a couple of adjacent
channels to be the
AND,
ONLY CH(n),
ONLY CH(n+1),
OR
of the relevant self-trigger signals (see
Fig. 9.10
).
Default Conditions:
by default, the FPGA is programmed so that the trigger request is the OR of two pulses of 4ns-
width.
Note:
the above described configurability of both the self-trigger logic and the trigger request logic are supported only
by AMC FPGA firmware releases >
0.1
.
Previous firmware don’t impleme
nt the register address 0x1n84 as well as the 0x1n70, the self-trigger is intended only
as the over/under threshold signal and a trigger request is intended only as the OR of the self-triggers couple.