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A 45-nm 37.3 GOPS/W Heterogeneous Multi-Core SOC with 16/32 Bit Instruction-Set General-Purpose Core
Osamu NISHII Yoichi YUYAMA Masayuki ITO Yoshikazu KIYOSHIGE Yusuke NITTA Makoto ISHIKAWA Tetsuya YAMADA Junichi MIYAKOSHI Yasutaka WADA Keiji KIMURA Hironori KASAHARA Hideo MAEJIMA
IEICE TRANSACTIONS on Electronics
Publication Date: 2011/04/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Integrated Electronics
heterogeneous, instruction set, MMU,
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We built a 12.4 mm12.4 mm, 45-nm CMOS, chip that integrates eight 648-MHz general purpose cores, two matrix processor (MX-2) cores, four flexible engine (FE) cores and media IP (VPU5) to establish heterogeneous multi-core chip architecture. The general purpose core had its IPC (instructions per cycle) performance enhanced by adding 32-bit instructions to the existing 16-bit fixed-length instruction set and executing up to two 32-bit instructions per cycle. Considering these five-to-seven years of embedded LSI and increasing trend of access-master within LSI, we predict that the memory usage of single core will not exceed 32-bit physical area (i.e. 4 GB), but chip-total memory usage will exceed 4 GB. Based on this prediction, the physical address was expanded from 32-bit to 40-bit. The fabricated chip was tested and a parallel operation of eight general purpose cores and four FE cores and eight data transfer units (DTU) is obtained on AAC (Advanced Audio Coding) encode processing.