In this paper, we made an analysis on the logic operations involved in conventional carry select adder (CSLA) and binary to excess-1 converter (BEC)-based CSLA to study the data-dependency and to identify redundant logic operations. We have eliminated all the redundant logic operations present in conventional CSLA and proposed a new logic formulation
for CSLA. In the proposed scheme, the carry-select operation is scheduled before the calculation of final-sum, which is different from the conventional approach. Bit-patterns of two anticipating
carry-words (corresponding to Cin=0 and 1) and fixed Cin bits are used for logic optimization of carry select and generation units. An efficient CSLA design is obtained using optimized logic units. The proposed CSLA design involves significantly less area and delay than the recently proposed BEC-based CSLA. Due to small carry-output delay, the proposed CSLA design is a good candidate for square-root (SQRT)-CSLA. Theoretical estimate shows that the proposed SQRT-CSLA involves nearly less area-delay-product (ADP) than the BEC-based SQRTCSLA which is the best amongst the existing SQRT-CSLA designs on average for different bit-widths. FPGA synthesis result shows that, the BEC-based SQRT-CSLA design involves more Area Delay Product and consumes more energy than the proposed SQRT-CSLA on average for different bit-widths.
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.
EXISTING SYSTEM TECHNIQUE:
· Ripple Carry Adder
EXISTING SYSTEM DRAWBACKS
· More area overhead system
· More power consumption
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 has been proposed. We observe that, logic optimization largely depends on availability of redundant operations in the formulation, where adder delays mainly depends on data-dependency.
Binary to Excess-1 Converter
· ModelSim 6.4c
· Xilinx ISE 9.1/14.2
· FPGA Spartan 3
· It’s mainly used in Digital signal processing
· Area efficient system like satellite, mobile phones
· Less area overhead
· Less power consumption
· High speed architecture
In our Base paper they are Implemented 8 Bit, 16 Bit, and 32 Bit Existing and Proposed adders. Now our proposed architecture converted into 128 bit Adders and analyzes the area power. This adder will be done by using our verilog and the Adder design will implemented into FPGA Spartan3.
Title 1: Implementationof an Efficient Carry-Select Adder on FPGA
Title 2: An efficient realization of 128 Bit Carry-Select Adder
Title 3: Achievement of Carry-Select Adder Using Verilog HDL
60% of Base Paper (3 Modules only Simulation)
Remaining 40% of Base Paper with Future Enhancement (Modification).
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