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Hitachi's SH series represents a 32-bit RISC architecture with 16-bit fixed-length instruction set. SH3 is a pipelined implementation of the SH architecture with on-chip cache, MMU, and software programmable power management. This article briefly describes the SH architecture and SH3 implementation, and establishes the advantages of such an instruction set. SH3 achieves 60-Dhrystone MIPS of performance and dissipates 400 mW at 60 MHz. Higher code density and corresponding improvement in instruction fetch latency leads to higher performance as compared with typical 32-bit RISC architectures. Small die size, low power consumption, and software-controlled power management capability make SH3 an ideal microprocessor for embedded applications such as nomadic computing systems or multimedia systems.
Hitachi SH series, microprocessors, RISC, low power computing, code density

I. Kawasaki, A. Hasegawa, P. Biswas, K. Yamada, S. Yoshioka and S. Kawasaki, "SH3: High Code Density, Low Power," in IEEE Micro, vol. 15, no. , pp. 11-19, 1995.
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