ADLINK DAQe-2006 - Manual (Page 84)

72 Operation Theory
ple the data according to external events. In this mode, the
Trigger signal and trigger mode settings are not available.
AFI[0] could also be used as SCAN_START signal for A/D
operations. Refer to section 4.1 and section 4.6 for detailed
descriptions of the SCAN_START signal. When using external
signal (AFI[0]) to replace the internal SCAN_START signal, the
pulse width of the AFI[0] must be greater than two time of the
period of Timebase. This feature is suitable for the DAQ-2200/
DAQe-2200/PXI-2200 Series, which can scan multiple chan-
nels data controlled by an external event. Note that the AFI[0]
is a multi-purpose input, and it can only be utilized for one func-
tion at any one time.
AFI[1]
Regarding the D/A operations, users could directly input the
external D/A update signal to replace the internal DAWR sig-
nal. This is another way to achieve customized D/A update
rates. The external DAWR signal can only be inputted from the
AFI[1]. Note that the AFI[1] is a multi-purpose input, and it can
only be utilized for one function at any one time. AFI[1] cur-
rently only has one function. ADLINK reserves it for future
development.
System Synchronization Interface
SSI (System Synchronization Interface) provides the DAQ timing
synchronization between multiple cards. In DAQ-/DAQe-/PXI-
2016/2010/2006/2005 card, we designed a bi-directional SSI I/O
to provide flexible connection between cards and allow one SSI
master to output the signal and up to three slaves to receive the
SSI signal. Note that the SSI signals are designed for card syn-
chronization only and not for external devices.