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J.Bamela Mary1, K.Ramamoorthy2

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For efficient hardware implementation many designers designs several multiplier structure based on different techniques. But these designs are achieving only 30% of power reduction and 28% of area reduction. In this paper we propose a low complexity and low latency multiplier in order to reduce the requirement of power and area. The proposed work is fully based on the distributed arithmetic algorithm (DAA) which provides the better performance than the existing designs. The proposed design will be coded in verilogHDL and synthesized in Xilinx ISE9.2i. From the synthesized result we will prove the modified structure that requires less area and less power than the existing ones. Finally the proposed design will be implemented on FPGA spartan3E hardware.
Index Terms 
Allone polynomial, finite field, systolic design. 
INTRODUCTION 
Finite field multipliers over GF(2^m) have wide applications in elliptic curve cryptography (ECC) and error control coding systems . Polynomial basis multipliers are popularly used because they are relatively simple to design, and offer scalability for the fields of higher orders. Efficient hardware design for polynomialbased multiplication is therefore important for realtime application.Allone polynomial (AOP) is one of the classes of polynomials considered suitable to be used as irreducible polynomial for efficient implementation of finite field multiplication. Multipliers for the AOPbased binary fields are simple and regular, and therefore, a number of works have been explored on its efficient realization. Irreducible AOPs are not abundant. They are very often not preferred in cryptosystems for security reasons, and one has to make careful choice of the field order to use irreducible AOPs for cryptographic applications. The AOPbased multipliers can be used for the nearly AOP (NAOP) which could be used for efficient realization of ECC systems. AOPbased fields could also be used for efficient implementation of Reed Solomon encoders.Besides, the AOPbased architectures can be used as a kernel circuit for field exponentiation, inversion, and division architectures. Systolic design is a preferred type of specialized hardware solution due to its highlevel of pipeline ability, local connectivity and many other advantageous features. In a bitparallel AOPbased systolic multiplier has been suggested by Lee et al. In a recent paper a lowcomplexity bitparallel systolic Montgomery multiplier has been suggested. Very recently an efficient digitserial systolic Montgomery multiplier for AOPbased binary extension field is presented. The systolic structures for field multiplication have two major issues. 
First, the registers in the systolic structures usually consume large area and power. Second, the systolic structures usually have a latency of nearly n cycles, which is very often undesired for realtime applications. Therefore, in this paper, we have presented a novel register sharing technique to reduce the register requirement in the systolic structure. The proposed algorithm not only facilitates sharing of registers by the neighboring PEs to reduce the register complexity but also helps reducing the latency. Cutset retiming allows to introduce certain number of delays on all the edges in one direction of any cutset of a signal flowgraph (SFG) by removing equal number of delays on all the edges in the reverse direction of the same cutset . When all the edges are in a single direction, one can introduce any desired number of delays on all the edges of any cutset of an SFG. Therefore, this technique is highly useful for pipelining digital circuits to reduce the critical path. In this paper, we have proposed a novel cutset retiming approach to reduce the clockperiod. The proposed structure is found to involve significantly less areatimepower complexity compared with the existing designs. 
RELATED WORK 
In fact, realtime signals may also be processed in this manner if the associated blockprocessing delay is acceptable. Another potentially important application for backward filtering is the implementation of Mallat twochannel iterated filter banks based on powercomplementary Butterworth filters (wavelets). The zerophase case is often used to implement frequencyselective infiniteimpulse response (IIR) filters corresponding to the squaredmagnitude of the classical Butterworth, Chebyshev, and elliptic designs. However, other interesting and potentially important applications exist for non causal IIR filters that are not zerophase. Examples include equalizers for non minimum phase systems, non causal speech models, halfsample interpolators, and 90degree phase shifters such as Hilbert transformers and differentiators. On the other hand, many fast algorithms in the context of digital filtering have been obtained based on particular matrix structures. Many approaches to block digital filters (BDFs) design exist. Some approaches compel the BDF to be timeinvariant so that conventional filter synthesis techniques can be used. The best known and most widely used approach is Overlapsave. In some other approaches, no such constraint on the BDF is imposed so that the BDF can be time variant. 
PROPOSED SYSTEM ARCHITECTURE 
Let A,B and C are the extended polynomials and these are represented as: 
Fig(3.1) General Signal Flow Graph 
Architecture for 1 *N convolution and 1bit input: 
Most 2D convolution implementations rely on the multiplying units embedded in modern FPGAs to carry out all the multiplications in parallel and to achieve great performance. However, as the kernel size increases, the number of embedded multipliers needed grows exponentially. This fact can constrain the kernel size or force to use a bigger FPGA device, which, in its turn, can yield a very high cost per operation ratio. On the other hand, a lot of work has been done on the design of multiplier less filters, mostly in the onedimensional domain, and some authors have implemented 2D convolution by replacing multiplications with shifting and adding operations or transforming the computation into the logarithmic domain. 
CONCLUSION 
Efficient systolic design for the multiplication over GF(2^m) based on irreducible AOP is obtained in my existing system. By using cutset retiming technique the critical path is reduced to one XOR gate delay and by sharing of registers for the inputoperands in the PEs, the lowlatency bitparallel systolic multiplier have been derived. For self checking I have simulated in modelsim. For evaluating the performance parameter I have used Xilinx ISE 9.2i. In my existing system the total power consumption is 81mW, latency is 11.771ns and required number of gates are around 650. Moreover the existing design will be reconstructed for reduce the latency, power requirement and gate count by using distributed arithmetic algorithm. 
References 
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