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PCM-3780 User Manual 48
D.3 Mode B Waveforms
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 that occur
while the gate is inactive.
This permits the gate to turn the counting 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