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EE2000 Logic Circuit Design
Sequential Circuits
Synchronous Sequential Logic
Design

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Example (revisit)
A system with one input
x
and one output
z
such
that
z
= 1 iff
x
has been 1 for at least three
consecutive clock times
Input sequence: 010011001010001110101100…
The system must store in its memory information
the last three inputs of
x
in order produce output
based on that
What is stored in memory is the
state
of the
system
This circuit is called
sequence recognizer