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PCI-1002 Series Card
12-bit, 110 kS/s or 44 kS/s Multi-function Board
7.3 The AD Timer
The AD trigger is controlled by on-board AD trigger controller. The function diagram of AD trigger is
shown below:
0
D
1
External
Trigger.
Figure 7-3: AD trigger controller.
AD trigger logic receives the external trigger and then performs the correct AD trigger function. In
order to be recognized by the AD trigger controller, the external trigger signal must be a TTL
compatible signal, with the minimum duration of pulse width to avoid noise. This signal must satisfy
the following specifications:
External trigger
Symbol
T
du
T
re
8254
Timer 0
Software Trigger
External Trigger
PR
Q
8254
EN
Timer 1
CLK
RS
4 MHz
t
du
Name
Duration time
Recover time
Mux
To AD
Select
Trigger Select
t
re
Minimum
40 ns
100 ns
User Manual, Ver. 3.0, Jun. 2018, PMH-015-30, Page: 54
Maximun
∞
∞
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