ADLINK PCIe-9814 - Manual (Page 35)

Operations 25
PCIe-9814
Table 3-4: Counter Parameters and Description
3.7 Synchronizing Multiple Modules
The PCIe-9814 provides a dedicated connector as system syn-
chronization interface, enabling multiple module synchroniza-
tion. As shown, bi-directional SSI I/Os provides a flexible
connection between modules, allowing one SSI master PCIe-9814
to output SSI signals to other slave modules.For more accurate
synchronization between modules, external sampling clock or
external reference clock should be applied.
The table summarizes SSI functionalities.
Counter
Name
Length Valid Value Description
ScanIntrv 16-bit 1-65535
Timebase divider to achieve
equivalent sampling rate of the
digitizer, where Sampling rate =
Timebase / ScanIntrv
DataCnt 31-bit 1-2147483647
Specifies the amount of data to
be acquired:
1 - 2147483648 for pre-trig or
mid-trig mode operation
trigDelayTicks 16-bit 1 -65535
Indicates time between a trigger
event and commencement of
acquisition. The unit of a delay
count is the period of the
Timebase.
ReTrgCnt 31-bit 1-2147483647
Enables re-trigger to accept
multiple triggers.
1 - 2147483647 for normal
operation
See Section 3.4.5: Acquisition
with Re-Triggering
NOTE: NOTE:
Different signals cannot be routed onto the same trigger bus
line.