Table of Contents
Control Inputs Used as a Second Clock
A set and a reset control can be tied together and used as another clock input.
In
this case, the resultant clock is the ANDed result of both clocks.
Figure A-12 contains dia-
grams describing this mode of flip-flop operation,
A. LOGIC DIAGRAM
CLOCK
SECOND CLOCK
B.
TIMING DIAGRAM
CLOCK
{~
SECOND CLOCK {
~
RESULTANT { I
CLOCK
0
501
SET
{'_j
OUTPUT
0
SET OUTPUT
ALL DC SET AND RESET
INPUTS MUST BE LOGIC ONES.
THE UNUSED SET AND RESET
CONTROL INPUTS ARE ONES
IN THIS EXAMPLE.
Figure A-12.
Control Inputs Used As a Second Clock
Control Inputs Used Directly to Set or Reset
L
The set and the reset control inputs can also be used separately to change the state
of the flip-flop.
When the clock is a ONE, the first control input that goes from ONE to
ZERO acts as the clock input.
After a set control changes from ONE to ZERO, the flip-flop
will be in the ONE state.
After a reset control changes from ONE to ZERO, the flip-flop
will be in the ZERO state.
Figure A-13 contains diagrams and equations describing this
mode of flip-flop operation.
A-19
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