Clocking sequential circuits

• Example: Door combination lock
  • Inputs are synchronized by the clock
    • Inputs are accepted when the clock signal goes high
  • Controller is clocked
    • Mux-control and open/closed signals change on the clock edge

reset

open/closed

new

C1

C2

C3

comparator

value

equal

multiplexer

equal

controller

mux control

clock

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