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Carry-Skip Adders. Generalization of Manchester Adders With CMOS Implementation – Carry Skip speed Comparable to CLA Less Area/Power Based on Observation that Carry Process Can “Skip” Stage for Which x i  y i (that is p i = x i  y i = 1)

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carry skip adders
Carry-Skip Adders
  • Generalization of Manchester Adders
  • With CMOS Implementation – Carry Skip speed Comparable to CLA
  • Less Area/Power
  • Based on Observation that Carry Process Can “Skip” Stage for Which xi  yi (that is pi = xiyi = 1)
  • Adder of n stages Divided into Stages of Selected Lengths
  • With Simple Ripple Carry
  • Each Group Generates “Group Carry-Propagate”=1 if all pi=1 in Each Group
  • This Signal Allows Incoming Carry to “Skip” Stages within Group and Generate Carry-out
carry skip adder group carry
Carry-Skip Adder-Group Carry

GCin

cin

cin

GCout

P1

P0

P2

GCin•P[2:0]