Counting circuit and address counter using the same
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United States of America Patent
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Sep 20, 2011
Grant Date -
Jan 20, 2011
app pub date -
Jul 19, 2010
filing date -
May 21, 2008
priority date (Note) -
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Abstract
A counting circuit includes first to fifth flip-flops (FFs) and a logic operation unit. Each of the first to fourth FFs has an initial value based on a preset control signal input through a 4-bit set terminal and outputs a signal according to a clock signal. The fifth FF is coupled to the output terminal of the fourth FF and is configured to output the output signal of the fourth FF synchronously with the clock signal. The logic operation unit logically combines the output signals of the second to fourth FFs and outputs first and second counting signals.
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