ADLINK PXI-2006 - Manual (Page 77)

Operation Theory 67
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
syn-chronization between multiple cards. In DAQ/PXI-20XX
series, we de-signed 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 synchronization only, not for
external devices.
SSI timing signal Functionality
SSI_TIMEBASE
SSI master: send the TIMEBASE out
SSI slave: accept the SSI_TIMEBASE to
replace the internal TIMEBASE signal.
Note: Affects on both A/D and D/A opera-
tions
SSI_AD_TRIG
SSI master: send the internal AD_TRIG out
SSI slave: accept the SSI_AD_TRIG as the
digital trigger signal.
SSI_ADCONV
SSI master: send the ADCONV out
SSI slave: accept the SSI_ADCONV to
replace the internal ADCONV signal.
SSI_SCAN_START
SSI master: send the SCAN_START out
SSI slave: accept the SSI_SCAN_START to
replace the internal SCAN_START signal.
SSI_DA_TRIG
SSI master: send the DA_TRIG out.
SSI slave: accept the SSI_DA_TRIG as the
digital trigger signal.
SSI_DAWR
SSI master: send the DAWR out.
SSI slave: accept the SSI_DAWR to replace
the internal DAWR signal.
Table 4-10: Summary of SSI timing signals and the corresponding
functionalities as the master or slave