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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT:

·         Conventional CSLA is a RCA-RCA configuration which generates a pair of sum words and output-carry bits corresponding the anticipated input-carry  (cin= 0 and 1), and selects one out of each pair for final-sum and final-output-carry.

·         Conventional CSLA has less CPD than RCA, but the design is not attractive, since it uses dual RCA. Few attempt have been made to avoid dual use of RCA in CSLA design.

PROPOSED CONCEPT:           

·         The CBL based CSLA of  involves significantly less logic resource than the conventional CSLA, but it has longer CPD which is almost equals to that of RCA. To overcome this problem, SQRT-CSLA based on CBL have been proposed.

·         We observe that, logic optimization largely depends on availability of redundant operations in the formulation, where adder delay mainly depends on data-dependency.

EXISTING TECHNIQUE:

·         Ripple Carry Adder

PROPOSED TECHNIQUE:

·         New Carry Select Adder

TECHNIQUE DEFINITION:

·         A ripple carry adder is a logic circuit in which the carry-out of each full adder is the carry in of the succeeding next most significant full adder. It is called a ripple carry adder because each carry bit gets rippled into the next stage.

TECHNIQUE DEFINITION:

·         This technique is  used  for  the next stage of  the binary output.

DRAWBACKS:

·         More area overhead system

·         More power consumption

·         Low speed architecture

ADVANTAGES:

·         Less area overhead system

·         Less power consumption

·         High speed architecture