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An Improved Design of ALU in 8-bit Single-chip Microcomputer

2014-03-05
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This paper proposes the working principle of the arithmetic logic unit in a reduced instruction set 8-bit microcontroller. On this basis, the traditional PIC solution, the 332 solution and the 44 solution that use pipeline operation again in the ALU are compared, and they are implemented using the Synopsys synthesis tool. The synthesis and simulation results show that according to the system requirements of the microcontroller, the 44 solution has the highest speed, which can be improved by 43.9% compared with the 332 solution, while the area is only 1.6% higher than the smallest 332 solution. After analyzing the root cause of the performance difference, the superiority of this solution is explained. Keywords: Singlechip, Microcomputer, RISC, ALU, PipelineAbstract: Work principle for ALU in an 8_bit RISC Singlechip microcomputer is described. The traditional PIC scheme, 332 Pipeline scheme and 44 Pipeline scheme are compared on the base of the principle, which are implemented using Synopsys design tools. Results from synthesis and simulation shows that 44 scheme operates the fast, which is 43.9% faster and only 1.6% larger than 332 scheme. The essential reason why the performance is so different is analyzed.Then the advantage of 44 scheme is clarified.Key words: Singlechip, Microcomputer, RISC, ALU, Pipeline

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