PPT Slide

3 – Combinational Logic Implementation

© 1996 Gaetano Borriello

Momentary changes in outputs

• Can be useful — pulse shaping circuits

• Can be a problem — incorrect circuit operation (glitches/hazards)

• Example: pulse shaping circuit

  • A' • A = 0
  • delays matter in function

22

F is not always 0

pulse 3 gate-delays wide

D remains high for

three gate delays after

A changes from low to high

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