User`s guide

58

Operation Theory
4.6 User-controllable Timing Signals
In order to meet the requirements for user-specific timing and the re-
quirements for synchronizing multiple cards, the DAQ-2213/2214 provides
flexible user-controllable timing signals to connect to external circuitry or
additional cards.
The whole DAQ timing of the DAQ-2213/2214 is composed of a bunch of
counters and trigger signals in the FPGA. These timing signals are related
to the A/D conversions and Timer/Counter applications. These timing
signals can be inputs to or outputs from the I/O connectors, the SSI con-
nector. Therefore the internal timing signals can be used to control external
devices or circuitry’s operation.
We implemented signal multiplexers in the FPGA to individually choose the
desired timing signals for the DAQ operations, as shown in the Figure 46.
Internal timing
signals
SSI timing
Signals
AFI timing
signals
DAQ timing
signals
SSI timing
Signals
Trigger_Out
timing signals
Figure 46: DAQ signals routing
Users can utilize the flexible timing signals through our software drivers,
and simply and correctly connect the signals with the DAQ-2213/2214
cards. Here is the summary of the DAQ timing signals and the corre-
sponding functionalities for DAQ-2213/2214.
Timing signal category Corresponding functionality
SSI signals Multiple cards synchronization
AFI signals Control card by external timing signals
Figure 47: Summary of user-controllable timing signals and the
corresponding functions