MBus : A Fully Synthesizable Low-power Portable Interconnect Bus for Millimeter-scale Sensor Systems

Inhee Lee; Ye-Sheng Kuo; Pat Pannuto; Gyouho Kim; Zhiyoong Foo; Ben Kempke; Seokhyeon Jeong; Yejoong Kim; Prabal Dutta; David Blaauw; Yoonmyung Lee

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JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE 학술저널
Journal of Semiconductor Technology and Science Vol.16 No.6
2016.12 745 - 753 (9page)

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Inhee Lee (University of Michigan)
Ye-Sheng Kuo
Pat Pannuto (University of Michigan)
Gyouho Kim (University of Michigan)
Zhiyoong Foo (CubeWorks)

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This paper presents a fully synthesizable low power interconnect bus for millimeter-scale wireless sensor nodes. A segmented ring bus topology minimizes the required chip real estate with low input/output pad count for ultra-small form factors. By avoiding the conventional open drain-based solution, the bus can be fully synthesizable. Low power is achieved by obviating a need for local oscillators in member nodes. Also, aggressive power gating allows low-power standby mode with only 53 gates powered on. An integrated wakeup scheme is compatible with a power management unit that has nW standby mode. A 3-module system including the bus is fabricated in a 180 nm process. The entire system consumes 8 nW in standby mode, and the bus achieves 17.5 pJ/bit/chip.

#Wireless sensor node #IoT #data bus #interconnect #low power