ADLINK Technology PCIe-9529, Руководство пользователя

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22 Operations
3.3 Trigger Source and Trigger Modes
Figure 3-3: Trigger Architecture
The PCIe-9529 requires a trigger to implement acquisition of data.
Configuration of triggers requires identification of trigger
source. The PCIe-9529 supports internal software trigger, external
digital trigger and SSI Bus Number 5 as well as analog trigger.
Software Trigger
The software trigger, generated by software command, is
asserted immediately following execution of specified function
calls to begin the operation.
External Digital Trigger
An external digital trigger is generated when a TTL rising edge
or a falling edge is detected at the SMB connector on the front
panel. As shown, trigger polarity can be selected by software.
Note that the signal level of the external digital trigger signal
should be TTL compatible, with minimum pulse width 10ns.
Trigger Source Mux
Analog
Trigger
SSI BUS [5]
SSI_AD_TRIG
Software Trigger
Analog CH0
Analog CH1
TRG IN
SMB Connector
Digital Trigger Input
Trigger
Decision
SSI BUS [5]
SSI_AD_TRIG
To Internal
Circuit
Analog CH2
Analog CH3
Analog CH4
Analog CH5
Analog CH6
Analog CH7
Analog
Trigger
Selection