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Advanced instruction set architectures for reducing program memory usage in a DSP processor

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4 Author(s)
Simonen, P. ; Inst. of Digital & Comput. Syst., Tampere Univ. of Technol., Finland ; Saastamoinen, I. ; Kuulusa, M. ; Nurmi, J.

On-chip memories can consume multiple times the area of a processor core, thus affecting to the chip costs dramatically. In this paper three approaches for reducing program memory footprint in a DSP processor are analyzed: fully 16-bit and two versions of mixed 16/32-bit instruction encodings. A separate decompression logic is implemented between memory and core, so the 32-bit processor core remained unchanged. Compared to the original 32-bit instruction set, the fully 16-bit ISA (Instruction Set Architecture) eliminates 22% of the program memory footprint with a 1.55 times the original runtime. Mixed 16/32-bit ISAs achieve virtually same memory size, but with a faster runtime of 1.29 times the original at best

Published in:

Electronic Design, Test and Applications, 2002. Proceedings. The First IEEE International Workshop on

Date of Conference:

2002

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