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60 MI.20xx Manual
External TTL trigger Trigger modes and appendant registers
Positive and negative TTL trigger
This mode is for detecting the rising and falling edges of an ex-
ternal TTL signal. The board will trigger on the first rising or falling
edge that is detected after starting the board. The next triggere-
vent will then be detected, if the actual recording/replay has fi-
nished and the board is armed and waiting for a trigger again.
Pulsewidth triggers
TTL pulsewidth trigger for long HIGH pulses
This mode is for detecting HIGH pulses of an external TTL signal
that are longer than a programmed pulsewidth. If the pulse is
shorter than the programmed pulsewidth, no trigger will be detec-
ted. The board will trigger on the first pulse matching the trigger
condition after starting the board. The next triggerevent will then
be detected, if the actual recording/replay has finished and the
board is armed and waiting for a trigger again.
TTL pulsewidth trigger for short HIGH pulses
This mode is for detecting HIGH pulses of an external TTL signal
that are shorter than a programmed pulsewidth. If the pulse is lon-
ger than the programmed pulsewidth, no trigger will be detected.
The board will trigger on the first pulse matching the trigger con-
dition after starting the board. The next triggerevent will then be
detected, if the actual recording/replay has finished and the
board is armed and waiting for a trigger again.
Register Value Direction Description
SPC_TRIGGERMODE 40000 r/w Sets the triggermode for the board.
TM_TTLBOTH 20030 Sets the trigger mode for external TTL trigger to detect positive and negative edges.
Register Value Direction Description
SPC_PULSEWIDTH 44000 r/w Sets the pulsewidth in samples. Values from 2 to 255 are allowed.
SPC_TRIGGERMODE 40000 r/w Sets the triggermode for the board.
TM_TTLHIGH_LP 20001 Sets the trigger mode for external TTL trigger to detect HIGH pulses that are longer than a programmed pulsewidth.
Register Value Direction Description
SPC_PULSEWIDTH 44000 r/w Sets the pulsewidth in samples. Values from 2 to 255 are allowed.
SPC_TRIGGERMODE 40000 r/w Sets the triggermode for the board.
TM_TTLHIGH_SP 20002 Sets the trigger mode for external TTL trigger to detect HIGH pulses that are shorter than a programmed pulsewidth.