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EE2000 Logic Circuit Design
7
Sequential Logic Circuit Design

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Example (Revisit)
A circuit 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
x
is not fixed, but changing from time to time
Input sequence
x
: 01001100101000111…
The circuit must remember the last three inputs
of
x
in order produce correct output
z
This circuit is called
sequence recognizer
x
z
Input
?
output
memory