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Software Trigger
Register
The Software Trigger Register provides a means to trigger the module when
software trigger has been selected as the trigger source in the Trigger
Control Register.
Address
Base + 0C
16
Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
WRITE Software Trigger
Software Trigger: When software trigger is selected as the trigger source
in the Trigger Control Register, any write to this register generates the
trigger (the value written is not important).
Trigger Control
Register
The Trigger Control Register selects the sources, destinations, and modes
used to synchronize channels programmed for triggered operation.
Address
Base + 0E
16
Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
READ Trig
Syst En
Unused Trigger Out Trigger
Mode
Trigger Source
WRITE
Trig Syst En: Writing a one (1) to this field enables the trigger system.
Writing a zero (0) disables the trigger system.
Trigger Out: This field selects which VXIbus trigger line will be driven when
the trigger mode is set to Output. The trigger lines selected are shown below.
Line Out Selected
Bits
08 07 06
TTLTRIG0* 0 0 0
TTLTRIG1* 0 0 1
TTLTRIG2* 0 1 0
TTLTRIG3* 0 1 1
TTLTRIG4* 1 0 0
TTLTRIG5* 1 0 1
TTLTRIG6* 1 1 0
TTLTRIG7* 1 1 1
Trigger Mode: This field selects the operating mode for trigger-enabled
channels.
Trigger Mode
Bits
05 04
SYNC 0 0
OUTPUT 1 1
Appendix B HP E1418A Register-Based Programming 131