Design Choice in 45-nm Dual-Port SRAM — 8T, 10T Single End, and 10T Differential
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- Noguchi Hiroki
- Graduate School of Engineering, Kobe University
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- Iguchi Yusuke
- Graduate School of Engineering, Kobe University
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- Fujiwara Hidehiro
- Graduate School of Engineering, Kobe University
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- Okumura Shunsuke
- Graduate School of Engineering, Kobe University
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- Nii Koji
- Renesas Electronics Corporation
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- Kawaguchi Hiroshi
- Graduate School of Engineering, Kobe University
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- Yoshimoto Masahiko
- Graduate School of Engineering, Kobe University JST, CREST
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As process technology is scaled down, a large-capacity SRAM will be used. Its power must be lowered. The Vth variation of the deep-submicron process affects the SRAM operation and its power. This paper compares the macro area, readout power, and operating frequency among dual-port SRAMs: an 8T SRAM, 10T single-end SRAM, and 10T differential SRAM considering the multi-media applications. The 8T SRAM has the lowest transistor count, and is the most area efficient. However, the readout power becomes large and the access time increases because of peripheral circuits. The 10T single-end SRAM, in which a dedicated inverter and transmission gate are appended as a single-end read port, can reduce the readout power by 74%. The operating frequency is improved by 195%, over the 8T SRAM. However, the 10T differential SRAM can operate fastest (256% faster than the 8T SRAM) because its small differential voltage of 50mV achieves high-speed operation. In terms of the power efficiency, however, the readout current is affected by the Vth variation and the timing of sense cannot be optimized singularly among all memory cells in a 45-nm technology. The readout power remains 34% lower than that of the 8T SRAM (33% higher than the 10T single-end SRAM); even its operating voltage is the lowest of the three. The 10T single-end SRAM always consumes less readout power than the 8T or 10T differential SRAM.
収録刊行物
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- Information and Media Technologies
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Information and Media Technologies 6 (2), 296-306, 2011
Information and Media Technologies 編集運営会議
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詳細情報 詳細情報について
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- CRID
- 1390282680241846144
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- NII論文ID
- 110009598049
- 130000770570
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- NII書誌ID
- AA12394951
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- ISSN
- 18810896
- 18826687
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- HANDLE
- 20.500.14094/90002988
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
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