User manual

D.2 Mode B waveform
Software-Triggered Strobe with Level Gating
Mode B is identical to Mode A except that source edges are counted
only when the assigned Gate is active. The counter must be armed
before counting can occur. Once armed, the counter will count all source
edges that occur while the Gate is active and disregard those edges
which occur while the Gate is inactive.
This permits the Gate to turn the count process on and off. On each TC
the counter will reload from the Load register and automatically disarm
itself, inhibiting further counting until a new ARM command is issued.
SOURCE
WR
ARM
COMMAND
COUNT
VALUE
TC OUTPUT
TC TOGGLED
OUTPUT
GATE
X
L L-1 L-2 K+1 K 2 1 0 L
Mode B Waveforms
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