PPT Slide

5 – Sequential Logic

© 1996 Gaetano Borriello

Master-slave structure

• Break flow by alternating clocks (like an air-lock)

  • use positive clock to latch inputs into one R-S latch
  • use negative clock to change outputs with another R-S latch

• View pair as one basic unit

  • master-slave flip-flop
  • twice as much logic
  • output changes a few gate delays after the falling edge of clock but does not affect any cascaded flip-flops

15

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