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A decade counter counts
from 0 to 9 and then
resets to zero.
The counter output can
be set to zero by
pulsing the reset line
low.
The count then
increments on each clock
pulse until it reaches
1001 (decimal 9).
When it increments to
1010 (decimal 10) both
inputs of the NAND gate
go high.
The result is that the
NAND output goes low,
and resets the counter
to zero.
D going low can be a
CARRY OUT signal,
indicating that there
has been a count of ten.
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