ADLINK PXI-2502 - Manual (Page 55)

Operation Theorem
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4.6.1 System Synchronization Interface
SSI uses bi-directional I/O to provide flexible connections between boards.
You can choose each of the 7 timing signals and which board to be the SSI
master. The SSI master can drive the timing signals of the slaves. Users
can thus achieve better synchronization between boards.
Note that when power-up or reset, the DAQ board is reset to using its in-
ternal timing signals.