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55 Appendix D
D.10 Mode I Waveforms
Hardware-Triggered Delayed Pulse Strobe
Mode I is identical to Mode G, except that counting will not begin until a
gate edge is applied to an armed counter. The counter must be armed
before application of the triggering gate edge. Gate edges applied to a dis-
armed counter are disregarded. An armed counter will start counting on
the first source edge after the triggering gate edge. Countering will then
proceed in the same manner as in Mode G. After the second TC, the
counter will disarm itself. An ARM command and gate edge must be
issued in this order to restart counting.
Note that after application of a triggering gate edge, the gate input will be
disregarded until the second TC. This differs from Mode H, where the
gate can be modulated throughout the count cycle to stop and start the
counter.
SOURCE
COUNT
VALUE
TC OUTPUT
TC TOGGLED
OUTPUT
GATE
L-1 L-2 2 0
Mode I Waveforms
X L 1 H
WR
ARM
COMMA ND
H-1 H-2 2 01 L