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181 results on '"Pascal Vivet"'

1. A 50.5 ns Wake-Up-Latency 11.2 pJ/Inst Asynchronous Wake-Up Controller in FDSOI 28 nm

Author

Jean-Frédéric Christmann, Florent Berthier, David Coriat, Ivan Miro-Panades, Eric Guthmuller, Sébastien Thuries, Yvain Thonnart, Adam Makosiej, Olivier Debicki, Frédéric Heitzmann, Alexandre Valentian, Pascal Vivet, and Edith Beigné

Subjects
wake-up controller, IoT, QDI asynchronous logic, normally-off computing, big/little architecture, Applications of electric power, TK4001-4102
Abstract

Due to low activity in Internet of Things (IoT) applications, systems tend to leverage low power modes in order to reduce their power consumption. Normally-off computing thus arose, consisting in having turned off most part of a system’s power supply, while dynamically turning on components as the application needs it. As wake up sources may be diverse, simple controllers are integrated to handle smart wake up schemes. Therefore, to prevent overconsumption while transitioning to running mode, fast wake up sequences are required. An asynchronous 16-bit Reduced Instruction Set Computer (RISC) Wake-up Controller (WuC) is proposed demonstrating 50.5 ns@9.2 Million Instructions Per Second (MIPS)@0.6 V wake-up latency, drastically reducing the overall wake-up energy of IoT systems. A clockless implementation of the controller saves the booting time and the power consumption of a clock generator, while providing high robustness to environmental variations such as supply voltage level. The WuC is also able to run simple tasks with a reduced Instruction Set Architecture (ISA) and achieves as low as 11.2 pJ/inst @0.5 V in Fully Depleted Silicon On Insulator (FDSOI) 28 nm.

Published
2019
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10. 2.3 A 220GOPS 96-Core Processor with 6 Chiplets 3D-Stacked on an Active Interposer Offering 0.6ns/mm Latency, 3Tb/s/mm2 Inter-Chiplet Interconnects and 156mW/mm2@ 82%-Peak-Efficiency DC-DC Converters.

Author

Pascal Vivet, Eric Guthmuller, Yvain Thonnart, Gaël Pillonnet, Guillaume Moritz, Ivan Miro-Panades, César Fuguet Tortolero, Jean Durupt, Christian Bernard, Didier Varreau, Julian J. H. Pontes, Sébastien Thuries, David Coriat, Michel Harrand, Denis Dutoit, Didier Lattard, Lucile Arnaud, Jean Charbonnier, Perceval Coudrain, Arnaud Garnier, Frédéric Berger, Alain Gueugnot, Alain Greiner, Quentin L. Meunier, Alexis Farcy, Alexandre Arriordaz, Séverine Cheramy, and Fabien Clermidy

Published
2020
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22. Architecting Optically Controlled Phase Change Memory

Author

Aditya Narayan, Yvain Thonnart, Pascal Vivet, Ayse Coskun, and Ajay Joshi

Subjects
Hardware and Architecture, Software, Information Systems
Abstract

Phase Change Memory (PCM) is an attractive candidate for main memory, as it offers non-volatility and zero leakage power while providing higher cell densities, longer data retention time, and higher capacity scaling compared to DRAM. In PCM, data is stored in the crystalline or amorphous state of the phase change material. The typical electrically controlled PCM (EPCM), however, suffers from longer write latency and higher write energy compared to DRAM and limited multi-level cell (MLC) capacities. These challenges limit the performance of data-intensive applications running on computing systems with EPCMs. Recently, researchers demonstrated optically controlled PCM (OPCM) cells with support for 5 bits / cell in contrast to 2 bits / cell in EPCM. These OPCM cells can be accessed directly with optical signals that are multiplexed in high-bandwidth-density silicon-photonic links. The higher MLC capacity in OPCM and the direct cell access using optical signals enable an increased read/write throughput and lower energy per access than EPCM. However, due to the direct cell access using optical signals, OPCM systems cannot be designed using conventional memory architecture. We need a complete redesign of the memory architecture that is tailored to the properties of OPCM technology. This article presents the design of a unified network and main memory system called COSMOS that combines OPCM and silicon-photonic links to achieve high memory throughput. COSMOS is composed of a hierarchical multi-banked OPCM array with novel read and write access protocols. COSMOS uses an Electrical-Optical-Electrical (E-O-E) control unit to map standard DRAM read/write commands (sent in electrical domain) from the memory controller on to optical signals that access the OPCM cells. Our evaluation of a 2.5D-integrated system containing a processor and COSMOS demonstrates 2.14 × average speedup across graph and HPC workloads compared to an EPCM system. COSMOS consumes 3.8× lower read energy-per-bit and 5.97× lower write energy-per-bit compared to EPCM. COSMOS is the first non-volatile memory that provides comparable performance and energy consumption as DDR5 in addition to increased bit density, higher area efficiency, and improved scalability.

Published
2022

24. ITAC: A complete 3D integration test platform.

Author

Didier Lattard, Lucile Arnaud, Arnaud Garnier, Nicolas Bresson, Franck Bana, R. Segaud, Amadine Jouve, H. Jacquinot, Stéphane Moreau, Karim Azizi-Mourier, C. Chantre, Pascal Vivet, Gaël Pillonnet, F. Casset, F. Ponthenier, Alexis Farcy, S. Lhostis, Jean Michailos, Alexandre Arriordaz, and Séverine Cheramy

Published
2016
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