A Power- and Area-Efficient SRAM Core Architecture with Segmentation-Free and Horizontal/Vertical Accessibility for Super-Parallel Video Processing

Junichi MIYAKOSHI  Yuichiro MURACHI  Tomokazu ISHIHARA  Hiroshi KAWAGUCHI  Masahiko YOSHIMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.11   pp.1629-1636
Publication Date: 2006/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.11.1629
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Novel Device Architectures and System Integration Technologies)
SRAM,  low power,  parallel processing,  image signal processing,  H.264,  MPEG,  

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For super-parallel video processing, we proposed a power- and area-efficient SRAM core architecture with a segmentation-free access, which means accessibility to arbitrary consecutive pixels, and horizontal/vertical access. To achieve these flexible accesses, a spirally-connected local-wordline select signal and multi-selection scheme in wordlines are proposed, so that extra X-decoders in the conventional multi-division SRAM can be eliminated. Consequently, the proposed SRAM reduces a power and area by 57-60% and 60%, respectively, when it is applied to a 128 parallel architecture. The proposed 160-kbit SRAM with 16-read ports (2-read port SRAM with eight-parallel architecture) is implemented to a search window buffer for an H.264 motion estimation processor core which dissipates 800 µW for QCIF 15-fps in a 130-nm technology.