9.8 Hot Topic - Monolithic 3D: A Path to Real 3D Integrated Chips

Date: Thursday 12 March 2015
Time: 08:30 - 10:00
Location / Room: Salle Lesdiguières

Organisers:
Pierre-Emmanuel Gaillardon, École Polytechnique Fédérale de Lausanne (EPFL), CH
Giovanni De Micheli, École Polytechnique Fédérale de Lausanne (EPFL), CH

Chair:
Giovanni De Micheli, École Polytechnique Fédérale de Lausanne (EPFL), CH

Co-Chair:
Ian O’Connor, Institut des Nanotechnologies de Lyon, FR

As compared to standard 3D technologies, 3D Monolithic Integration (3DMI) overcomes the vertical connectivity challenge through the use of nano-scale inter-layer vias, which are orders-of-magnitude smaller than TSVs. In this hot topic session, we cover 3DMI for actual (FDSOI) and emerging (CNFETs and RRAM) technologies, and identify its promises from a design perspective.

Time	Label	Presentation Title Authors
08:30	9.8.1	A COMPREHENSIVE STUDY OF MONOLITHIC 3D CELL ON CELL DESIGN USING COMMERCIAL 2D TOOL Speakers: Olivier Billoint¹, Hossam Sarhan¹, Iyad Rayane², Maud Vinet¹, Perrine Batude¹, Claire Fenouillet-Beranger¹, Olivier Rozeau¹, Gérald Cibrario¹, Fabien Deprat¹, Aurélien Fustier¹, Jean-Eric Michallet¹, Olivier Faynot¹, Ogun Turkyilmaz¹, Jean-Frederic Christmann¹, Sébastien Thuries¹ and Fabien Clermidy¹ ¹CEA LETI, FR; ²Mentor, FR Abstract In this paper we present a methodology allowing an emulated-3D two tiers physical implementation of any design using 2D commercial tools. Place and Route is achieved through similar steps as required by 2D designs: pre clock tree synthesis (including placement), clock tree synthesis and routing; to which we added a folding step in order to emulate the 3D placement. Routing of both tiers in parallel using inter-tier metal layers is made possible by modifying input files of the tools. Our study covers power supply network on both tiers, forbidden inter-tier via on active placement and inter-tier back end flavors in order to refine quality of results. Benchmark results on two tiers 3D Monolithic integration have been done on several IPs (microcontroller, reconfigurable FFT and LDPC) using as reference ST 28nm FDSOI technology and show the correlation between cell density, routing congestion, wire length, operating frequency and power consumption. To our knowledge, this paper is the first one to evaluate monolithic 3D physical implementation using full 3D Back End description and taking into account power supply distribution on both tiers. Download Paper (PDF; Only available from the DATE venue WiFi)
09:00	9.8.2	MONOLITHIC 3D INTEGRATION: A PATH FROM CONCEPT TO REALITY Speakers: Max M. Shulaker, Tony F. Wu, Mohamed M. Sabry, Hai Wei, H.-S. Philip Wong and Subhasish Mitra, Stanford University, US Abstract Monolithic three-dimensional (3D) integration enables revolutionary digital system architectures of computation immersed in memory. Vertically-stacked layers of logic circuits and memories, with nano-scale inter-layer vias (with the same pitch and dimensions as tight-pitched metal layer vias), provide massive connectivity between the layers. The nano-scale inter-layer vias are orders of magnitude denser than conventional through silicon vias (TSVs). Such digital system architectures can achieve significant performance and energy efficiency benefits compared to today's designs. The massive vertical connectivity makes such architectures particularly attractive for abundant-data applications that impose stringent requirements with respect to low-latency data processing, high-bandwidth data transfer, and energy-efficient storage of massive amounts of data. We present an overview of our progress toward realizing monolithic 3D ICs, enabled by recent advances in emerging nanotechnologies such as carbon nanotube field-effect transistors and emerging memory technologies such as Resistive RAMs and Spin-Transfer Torque RAMs. Download Paper (PDF; Only available from the DATE venue WiFi)
09:30	9.8.3	A ULTRA-LOW-POWER FPGA BASED ON MONOLITHICALLY INTEGRATED RRAMS Speakers: Pierre-Emmanuel Gaillardon, Xifan Tang, Jury Sandrini, Maxime Thammasack, Somayyeh Rahimian Omam, Davide Sacchetto, Yusuf Leblebici and Giovanni De Micheli, École Polytechnique Fédérale de Lausanne (EPFL), CH Abstract Complex routing architectures, heavily using programmable switches, dominate the area, delay and power of Field Programmable Gate Arrays (FPGAs). With the ability of being monolithically integrated with CMOS chips, Resistive Random Access Memories (RRAMs) enable high-performance routing architectures through the replacement of Static Random Access Memory (SRAM)-based programming switches. Exploiting the very low on-resistance state achievable by RRAMs as well as the improved tolerance to power supply reduction, RRAM-based routing multiplexers can be used to significantly reduce the power consumption of FPGA systems with no performance compromises. By evaluating the opportunities of ultra-low-power RRAM-based FPGAs at the system level, we see an improvement of 12%, 26% and 81% in area, delay and power consumption at a mature technology node. Download Paper (PDF; Only available from the DATE venue WiFi)
10:00		End of session Coffee Break in Exhibition Area Coffee Break in Exhibition Area On all conference days (Tuesday to Thursday), coffee and tea will be served during the coffee breaks at the below-mentioned times in the exhibition area. Lunch Break On Tuesday and Wednesday, lunch boxes will be served in front of the session room Salle Oisans and in the exhibition area for fully registered delegates (a voucher will be given upon registration on-site). On Thursday, lunch will be served in Room Les Ecrins (for fully registered conference delegates only). Tuesday, March 10, 2015 Coffee Break 10:30 - 11:30 Lunch Break 13:00 - 14:30; Keynote session from 13:20 - 14:20 (Room Oisans) sponsored by Mentor Graphics Coffee Break 16:00 - 17:00 Wednesday, March 11, 2015 Coffee Break 10:00 - 11:00 Lunch Break 12:30 - 14:30, Keynote lectures from 12:50 - 14:20 (Room Oisans) Coffee Break 16:00 - 17:00 Thursday, March 12, 2015 Coffee Break 10:00 - 11:00 Lunch Break 12:30 - 14:00, Keynote lecture from 13:20 - 13:50 Coffee Break 15:30 - 16:00