Synchronous design - Transition effect

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• Satyawati Patil   -Posted on 09 Oct 15
  In synchronous design practices, clocked devices with TTL input levels should be selected in such a way that all devices clock on low to high level of transition. But,the type of transition 1→ 0→ 1→ 0 gives rise to an occurrence or existence of a dynamic hazard. This type of transition implies that it failed to switch cleanly.
  
  Static hazards exist only when there is a change of single variable to the combinational network resulting into transient change in other variables to occur.
  
  The problem of static hazard does not occur in synchronous design practices because the signals have a sufficient time for settling.
  
  The circuits which are free of static hazards are also free of dynamic hazards.
  

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