Transcript PERFECT Empower Project: Prototype Software

PERFECT Empower Project:
Prototype Software Releases
PI: Massoud Pedram
Co-PIs: Murali Annavaram and Kaushik Roy
(Purdue)
July 17, 2014
DARPA Perfect Releases: Overview
• Device Releases (nominal devices)
• 5nm gate length FinFET devices (7nm effective channel length) from
Prof. Kaushik Roy’s group)
• 7nm gate length FinFET devices (10nm effective channel length) with
two threshold voltages
• 14nm bulk CMOS devices
• Cell Library Releases
• 5nm gate length FinFET cell libraries for near- and super-threshold
operations
• 7nm gate length FinFET cell libraries with two threshold voltages for
near- and super-threshold operations
• 14nm CMOS cell libraries for near- and super-threshold operations
• 16nm CMOS (PTM) cell libraries for near- and super-threshold
operations
• Architecture-level Releases
• PCACTI
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Device Releases: 5nm Gate Length FinFET
• 5nm gate length (7nm channel length) FinFET devices
• SPICE-compatible Verilog-A models
• Based on NEMO5 simulator, which uses quantum transport
models (e.g., atomistic simulator)
• Three different device models depending on the degree of gate
underlap
• The most advanced device model in the release
• Available on the PERFECT Wiki site and NanoHub
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Device Releases: 7nm Gate Length FinFET
• 7nm gate length (10nm channel length) FinFET devices
with two different threshold voltages
• SPICE-compatible Verilog-A models
• Includes low-threshold FinFET devices with a threshold voltage
of 0.2V-0.25V as well as high-threshold devices with a threshold
voltage of 0.3V-0.35V
• Based on Synopsys TCAD suite (i.e., Sentaurus), which uses
semi-classical transport models with quantum correction
• Beta release available on the PERFECT Wiki site and
http://atrak.usc.edu/downloads/packages/
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Device Releases: 14nm CMOS Devices
• 14nm CMOS devices developed by Prof. Pedram’s team
• SPICE-compatible Verilog-A models
• Based on Synopsys TCAD suite (i.e., Sentaurus)
• Beta release available on the PERFECT Wiki site and
http://atrak.usc.edu/downloads/packages/
• May be compared with the PTM 16nm bulk CMOS device models
of Prof. Yu Cao’s team at Arizona State University
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Device Releases: Ongoing Work
• The beta releases of 5nm gate length and 7nm gate
length FinFET devices are nominal device models
• No accounting for the process variation effects yet
• Nominal device model parameters may have to be changed in
order to do proper design centering
• Must develop new models for a few critical corners
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Cell Library Releases: 5nm Gate Length FinFET
• Standard cell libraries based on 5nm gate length (7nm
channel length) FinFET devices
• Can be used for circuit synthesis
• Beta release available on the PERFECT Wiki site and
http://atrak.usc.edu/downloads/packages/
• Containing the following libraries:
• 5nm gate length FinFET library operating at 0.3V supply voltage
level (near-threshold operation)
• 5nm gate length FinFET library operating at 0.45V supply voltage
level (super-threshold operation)
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Cell Library Releases: 7nm Gate Length FinFET
• Standard cell libraries based on multi-threshold 7nm
gate length (10nm channel length) FinFET devices
• Beta release available on the PERFECT Wiki site and
http://atrak.usc.edu/downloads/packages/
• Containing the following libraries:
• FinFET_7nm_HVT_0300.lib: Standard cell library of high-threshold
FinFET devices operating at 0.3V supply voltage level (nearthreshold)
• FinFET_7nm_HVT_0450.lib: Standard cell library of high-threshold
FinFET devices operating at 0.45V supply voltage level (superthreshold)
• FinFET_7nm_LVT_0300.lib: Standard cell library of low-threshold
FinFET devices operating at 0.3V supply voltage level (nearthreshold)
• FinFET_7nm_LVT_0450.lib: Standard cell library of low-threshold
FinFET devices operating at 0.45V supply voltage level (superthreshold)
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Cell Library Releases: 14nm and 16nm CMOS
• Standard cell libraries based on 14nm CMOS devices
• Containing the following libraries:
• 14nm CMOS library at 0.55V supply voltage level (near-threshold operation)
• 14nm CMOS library at 0.70V supply voltage level (super-threshold operation)
• 14nm CMOS library at 0.80V supply voltage level (performance-boosted
operation)
• Standard cell libraries based on 16nm PTM CMOS
devices
• Containing the following libraries:
• 16nm CMOS library at 0.50V supply voltage level (near-threshold operation)
• 16nm CMOS library at 0.70V supply voltage level (super-threshold operation)
• Beta release available on the PERFECT Wiki site and
http://atrak.usc.edu/downloads/packages/
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Cell Library Releases: Ongoing Work
• Incorporating wire load modeling in the standard cell
library
• Wire load library will be released soon
• Generating (l-based) physical cells for layout
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Architecture-level Releases: PCACTI
• PCACTI: A delay, power, and area modeling tool for
cache and memory systems for deeply-scaled FinFET
devices supporting multiple voltage regimes
• Extension over the widely-used CACTI tool for bulk CMOS
devices
• Addresses key shortcomings of current releases of CACTI:
• Support only planar CMOS devices from 90nm to 22nm technology nodes
• Rely on outdated (and somewhat inaccurate) technological parameters
– Extracted from 2005 ITRS predictions
• Support only conventional 6T SRAM cell designs
– An 6T SRAM cell optimized for 130nm process is adopted for all technology
nodes
– The impact of VDD scaling and device mismatches have been ignored
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PCACTI: Novel Features
• Features of PCACTI (previously named FinCACTI):
• Accurate technology parameters for deeply-scaled (7nm gate length)
FinFET devices
• ON/OFF currents for N- and P-type fins (for temperatures ranging from 300K to 400K)
• SPICE-compatible Verilog-A models to derive gate- and circuit-level
parameters
• E.g., PMOS to NMOS size ratio, stack effect factor, DC noise margin of FinFET-based
SRAM cells
• Accurate area and capacitance models for FinFET devices
• Layout area, power, and access delay calculations for FinFET-based 6T
and 8T SRAM cells
• Architectural support for the 8T SRAM cells
• Multiple voltage support for SRAM cells
• Updated interconnect-related electrical parameters
• Based on 2012 version of the ITRS
• XML-based interfaces for specifying cache configuration, SRAM cell,
technological parameters, etc.
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PCACTI: Status and Near-Future Plans
• Current version supports 7nm gate length FinFET devices (low
threshold device), 14nm CMOS devices (our model), and 16nm PTM
CMOS devices
• Supports two operating voltage levels (near- and super-threshold)
for each technology node
• In the process of adding support for 22nm and 32nm CMOS
devices for completeness as well as various versions of the 5nm
gate length FinFET devices
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PCACTI: Releases, Reference, Results
• Releases of PCACTI under the PERFECT Wiki page and
http://atrak.usc.edu/downloads/packages/
•
PCACTI.zip file for download and web interface
• Reference:
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A. Shafaei, Y. Wang, X. Lin, and M. Pedram, “FinCACTI: Architectural analysis
and modeling of caches with deeply-scaled FinFET devices,” Proc. of the IEEE
Computer Society Annual Symposium on VLSI, July 2014, Best paper award.
• Sample Results for a 16KB, 4-way set-associative, L1 cache
•
•
7nm gate length FinFET (our device design) at VDD = 0.3V and VDD = 0.45V
14nm CMOS (our device design) at VDD = 0.55V and VDD = 0.8V
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PCACTI: Web Interface
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Longer Term Plans for PCACTI
• Planned work:
• Enhancing SRAM cell stability and reduce leakage:
• FinFET-based SRAM cells with multi-threshold devices
• FinFET-based SRAM cells dual-gate control capability
• Performing variability-aware design of SRAM cells: Joint
optimization of VDD and SRAM cell configuration
• Start using new models provided by PCACTI along with
architectural modeling and simulation tools such as GPUWattch
and McPAT for doing power/performance characterizations and
optimizations at the architecture and system levels
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