relation: https://eprints.uet.vnu.edu.vn/eprints/id/eprint/4081/
title: Low-power High-performance 32-bit RISC-V Microcontroller on 65-nm Silicon-On-Thin-BOX (SOTB)
creator: Hoang, Trong Thuc
creator: Duran, Ckristian
creator: Nguyen, Khai Duy
creator: Dang, Tuan Kiet
creator: Nguyen, Quang Nhu Quynh
creator: Than, Phuc Hong
creator: Tran, Xuan Tu
creator: Le, Duc Hung
creator: Tsukamoto, Akira
creator: Suzaki, Kuniyasu
creator: Pham, Cong Kha
subject: Electronics and Computer Engineering
subject: Scopus-indexed journals
subject: ISI-indexed journals
description: In this paper, a 32-bit RISC-V microcontroller in a 65-nm Silicon-On-Thin-BOX (SOTB) chip is presented. The system is developed based on the VexRiscv Central Processing Unit (CPU) with the Instruction Set Architecture (ISA) extensions of RV32IM. Besides the core processor, the System-on-Chip (SoC) contains 8KB of boot ROM, 64KB of on-chip memory, UART controller, SPI controller, timer, and GPIOs for LEDs and switches. The 8KB of boot ROM has 7KB of hard-code in combinational logics and 1KB of a stack in SRAM. The proposed SoC performs the Dhrystone and Coremark benchmarks with the results of 1.27 DMIPS/MHz and 2.4 Coremark/MHz, respectively. The layout occupies 1.32-mm2 of die area, which equivalents to 349,061 of NAND2 gate-counts. The 65-nm SOTB process is chosen not only because of its low-power feature but also because of the back-gate biasing technique that allows us to control the microcontroller to favor the low-power or the high-performance operations. The measurement results show that the highest operating frequency of 156-MHz is achieved at 1.2-V supply voltage (VDD) with +1.6-V back-gate bias voltage (VBB). The best power density of 33.4-µW/MHz is reached at 0.5-V VDD with +0.8-V VBB. The least current leakage of 3-nA is retrieved at 0.5-V VDD with -2.0-V VBB.
publisher: IEICE
date: 2020
type: Article
type: PeerReviewed
format: application/pdf
language: en
identifier: https://eprints.uet.vnu.edu.vn/eprints/id/eprint/4081/1/2020XCL0282_P1_oboScI-1.pdf
identifier:   Hoang, Trong Thuc and Duran, Ckristian and Nguyen, Khai Duy and Dang, Tuan Kiet and Nguyen, Quang Nhu Quynh and Than, Phuc Hong and Tran, Xuan Tu and Le, Duc Hung and Tsukamoto, Akira and Suzaki, Kuniyasu and Pham, Cong Kha  (2020) Low-power High-performance 32-bit RISC-V Microcontroller on 65-nm Silicon-On-Thin-BOX (SOTB).  IEICE Electronics Express, VV .    ISSN 1349-2543     
relation: https://www.jstage.jst.go.jp/article/elex/advpub/0/advpub_17.20200282/_article
relation: 10.1587/elex.17.20200282