A 24-b 50-ns Digital Image Signal Processor

Shin Ichi Nakagawa, Tetsuya Matsumura, Hiroshi Segawa, Masahiko Yoshimoto, Hirofumi Shinohara, Shu Ichi Kato, Masahiro Hatanaka, Yasutaka Horiba

Research output: Contribution to journalArticle

12 Citations (Scopus)


This paper will report a 50-ns digital image signal processor (DISP), excellently suited for picture coding. The chip integrates 538K transistors and dissipates 1.4 W at 40-MHz clock. It is based on a 24-b fixed-point architecture with a five-stage pipeline. The instruction cycle time is 35 ns typically and 50 ns at worst. The DISP features a real-time processing capability realized by an enhanced parallel architecture, video-oriented data processing functions, and a 50-ns instruction cycle time at worst. Its 50-ns cycle time allows it to execute more than 60-million operations per second (MOPS). High-density 1.0-μm CMOS technology allows numerous on-chip features, which include specified resources optimized for the image processing. This enables a flexible hardware implementation of various algorithms for the picture coding. Several circuit design techniques to attain the fast instruction cycle include a distributed instruction decoding and a hierarchical clocking circuit. The LSI has been designed by the extensive use of a cell-based design method. The processor incorporates a sophisticated testing function compatible with the cell-based design environment. This paper will also discuss system performance advantages in the image/ video processing including the picture coding.

Original languageEnglish
Pages (from-to)1484-1493
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Issue number6
Publication statusPublished - 1990 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Nakagawa, S. I., Matsumura, T., Segawa, H., Yoshimoto, M., Shinohara, H., Kato, S. I., Hatanaka, M., & Horiba, Y. (1990). A 24-b 50-ns Digital Image Signal Processor. IEEE Journal of Solid-State Circuits, 25(6), 1484-1493. https://doi.org/10.1109/4.62184