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The D type flip-flop has
only one input (D for
Data) apart from the
clock.
The INDETERMINATE state
is avoided with this
flip-flop.
When the clock goes
high, D (a 0 or a 1) is
transferred to Q.
When the clock goes low,
Q remains unchanged.
Q stores the data until
the clock goes high
again, when new data may
be available.
At A, clock and data are
high.
Q goes high and stays
high until B.
At B, clock is high and
data is low.
Q goes low and stays low
until C.
At C, clock and data are
both high.
Q goes high and stays
high until E.
Q does not change during
clock pulse D, because
clock and data are still
both high.
At E, data is low, so Q
goes low.
At F, data is high so Q
goes high.
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