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Architectures for Low Energy, Low Latency, High Performance, Durable Multi-/Triple-Level Cell Non-Volatile Memories

Palangappa, Poovaiah Manavattira (2017) Architectures for Low Energy, Low Latency, High Performance, Durable Multi-/Triple-Level Cell Non-Volatile Memories. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Multi-level/triple-level cell non-volatile memories (MLC/TLC NVMs) such as phase-change memory and resistive RAM are the potential replacement candidates for DRAM, which is limited by its high refresh power and poor scaling potential. Besides the benefits of non-volatility (low refresh power) and improved scalability, MLC/TLC NVMs offer high data density and memory capacity over DRAM. However, the viability of MLC/TLC NVMs is limited due to (i) high programming energy/latency and low endurance, (ii) security vulnerability due to non-volatility, and (iii) high read latency. This dissertation presents three architectures for low energy, low latency, high performance, durable MLC/TLC NVMs.

First, it presents CompEx/CompEx++ coding, a low overhead scheme that synergistically integrates pattern-based compression with linear block expansion coding to realize simultaneous energy, latency, and lifetime improvements in MLC/TLC NVMs.

Second, it presents CASTLE, a Compression-based read-decrypt-free Architecture that provides a read-decrypt-free block-level Secure solution for low laTency, Low Energy durable NVMs. At its core, CASTLE adopts a block-level write-only sequence to eliminate the latency of the read-decrypt steps in state-of-the-art NVM security solutions. Whereas a write-only approach increases cell updates, and thereby energy and latency, CASTLE in- tegrates pattern-based compression and expansion coding to realize energy reductions and lifetime improvements over state-of-the-art.

Third, it presents RAPID, a no-overhead critical-word-first read acceleration architecture for improved performance and durability in MLC/TLC NVMs. At its core, RAPID encodes the critical words in a cache line using only the most significant bits (MSbs) of the MLC/TLCs. Since the MSbs of an NVM cell can be decoded using a single read strobe, the data (i.e., critical words) encoded using the MSbs can be decoded with low latency.

This dissertation thus addresses the core challenges of write/read energy and latency, endurance, and security of MLC/TLC NVMs and proposes multiple solutions to these challenges.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Palangappa, Poovaiah Manavattirapmp30@pitt.edupmp30
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairMohanram, Kartikkmram@pitt.edukmram
Committee MemberStanchina, William E.wes25@pitt.eduwes25
Committee MemberYang, Junjuy9@pitt.edujuy9
Committee MemberMao, Zhi-Hongzhm4@pitt.eduzhm4
Committee MemberMotwani, Ravi H.ravi.h.motwani@intel.com
Date: 14 June 2017
Date Type: Publication
Defense Date: 24 February 2017
Approval Date: 14 June 2017
Submission Date: 24 March 2017
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Number of Pages: 135
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical and Computer Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Non-volatile memories, PCM, RRAM, ReRAM, Compression, expansion codes, memory security, energy reduction, latency reduction, durability, read improvement, read acceleration,
Date Deposited: 14 Jun 2017 18:18
Last Modified: 14 Jun 2017 18:18
URI: http://d-scholarship.pitt.edu/id/eprint/31037

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