Welcome!

News Feed Item

JEDEC Releases LPDDR4 Standard for Low Power Memory Devices

JEDEC Solid State Technology Association, the global leader in standards development for the microelectronics industry, today announced the publication of JESD209-4 Low Power Double Data Rate 4 (LPDDR4). Designed to significantly boost memory speed and efficiency for mobile computing devices such as smartphones, tablets, and ultra-thin notebooks, LPDDR4 will eventually operate at an I/O rate of 4266 MT/s, twice that of LPDDR3. The new interface promises to have an enormous impact on the performance and capabilities of next-generation portable electronics. “LPDDR4 represents a dramatic performance increase,” said Mian Quddus, Chairman, JEDEC Board of Directors. “It is intended to meet the power, bandwidth, packaging, cost and compatibility requirements of the world’s most advanced mobile systems.” Developed by JEDEC’s JC-42.6 Subcommittee for Low Power Memories, the JESD209-4 LPDDR4 standard can be downloaded from the JEDEC website for free by clicking here.

The market for mobile computing continues to grow, and with it the demand for ever faster devices and ever longer operation on a single charge. LPDDR4 launches with an I/O data rate of 3200 MT/s and a target speed of 4266 MT/s, compared to 2133 MT/s for LPDDR3. To achieve this performance, the members of the committee had to completely redesign the architecture, going from a one-channel die with 16 bits per channel to a two-channel die with 16 bits per channel, for a total of 32 bits.

“LPDDR3 was an evolutionary change from LPDDR2. With LPDDR4, the architecture is completely different,” said Hung Vuong, Chairman of JC-42.6. “We knew the only way to achieve the performance that the industry required was to make a total departure from previous generations.” The two-channel architecture reduces the distance data signals must travel from the memory array to the I/O bond pads. This reduces the power required to transmit the large amount of data the LPDDR4 interface requires. Because most of the area of a memory device is taken up by the memory array, doubling the interface area has a minimal impact on the overall footprint.

The two-channel architecture also allows the clock and address bus to be grouped together with the data bus. Thus, the skew between data bus to the clock and address bus is minimized, allowing the LPDDR4 device to reach a higher data rate. This saves power and improves timing margins compared to the LPDDR3 architecture.

A new approach to signaling

Recognizing that extending the LPDDR3 interface to higher frequencies would consume too much power, the JEDEC committee decided to implement a significant change in LPDDR4’s I/O signaling to low-voltage swing-terminated logic (LVSTL). LPDDR4’s LVSTL I/O signaling voltage of 367 or 440mV is less than 50% the I/O voltage swing of LPDDR3. This reduces power while enabling high-frequency operation. In addition, by using Vssq termination and data bus inversion (DBI), termination power can be minimized since any I/O signal driving a “0” consumes no termination power.

Several other steps were taken to save power. The operating voltage was reduced from the 1.2V of previous generations to 1.1V. Also, the standard was specifically designed to enable power-efficient operation at a wide range of frequencies. The I/O can operate in un-terminated mode at low frequencies with a reduced voltage swing, and the standard allows rapid switching between operating points so the lower frequency operation can be used whenever possible.

This rapid switching is enabled by the addition of frequency set points (FSPs). LPDDR4 specifies two FSPs, which are copies of all the DRAM registers that store operating parameters which might need to be changed for operation at two different frequencies. Once both operating frequencies are trained and the parameters stored in each of the two corresponding FSPs, switching between the frequencies can be accomplished by a single mode register write. This reduces the latency for frequency changes, and enables the system to operate at the optimal speed for the workload more often.

“It supports end-user flexibility,” noted Vuong. “Some designers like to run their devices as fast as they can and then put them to sleep. Others like to run at lower frequencies – and lower power – when possible. A process might take a little longer but that’s a trade-off they’re willing to make. We designed LPDDR4 to be flexible enough to allow the end-user to decide what they want to do.” With that flexibility comes superior performance – an LPDDR4 device, at a similar data rate, will consume less power than an LPDDR3 device.

Key specifications include:

  • Two-channel architecture
  • Internal Vref supplies for CA and DQ
  • Data Bus Inversion (DBI-DC)
  • ODT for CA and DQ
  • I/O throughput: 3200 MT/s, rising to 4266 MT/s
  • Signaling voltage: 367mV or 440mV
  • Operating voltage: 1.1V
  • Pre-fetch size: 32B per channel
  • Topology: Point to point, PoP, MCP
  • Max I/O capacitance: 1.3pF
  • Write leveling
  • 6-pin SDR CA bus CA training (12 pins per two channels)
  • As with previous low-power DRAM generations, LPDDR4 does not require a delay-locked loop (DLL) or phase-locked loop (PLL)

LPDDR4 Workshop

To facilitate understanding and adoption of the LPDDR4 standard, JEDEC is hosting an LPDDR4 Workshop in Santa Clara, CA on September 23, 2014. For online registration and agenda information visit: http://www.jedec.org/LPDDR4-ca-2014.

About JEDEC

JEDEC is the global leader in the development of standards for the microelectronics industry. Thousands of volunteers representing nearly 300 member companies work together in 50 JEDEC committees to meet the needs of every segment of the industry, manufacturers and consumers alike. The publications and standards generated by JEDEC committees are accepted throughout the world. All JEDEC standards are available for free download from the JEDEC website. For more information, visit www.jedec.org.

More Stories By Business Wire

Copyright © 2009 Business Wire. All rights reserved. Republication or redistribution of Business Wire content is expressly prohibited without the prior written consent of Business Wire. Business Wire shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon.

Latest Stories
A critical component of any IoT project is the back-end systems that capture data from remote IoT devices and structure it in a way to answer useful questions. Traditional data warehouse and analytical systems are mature technologies that can be used to handle large data sets, but they are not well suited to many IoT-scale products and the need for real-time insights. At Fuze, we have developed a backend platform as part of our mobility-oriented cloud service that uses Big Data-based approache...
Peak 10, Inc., has announced the implementation of IT service management, a business process alignment initiative based on the widely adopted Information Technology Infrastructure Library (ITIL) framework. The implementation of IT service management enhances Peak 10’s current service-minded approach to IT delivery by propelling the company to deliver higher levels of personalized and prompt service. The majority of Peak 10’s operations employees have been trained and certified in the ITIL frame...
trust and privacy in their ecosystem. Assurance and protection of device identity, secure data encryption and authentication are the key security challenges organizations are trying to address when integrating IoT devices. This holds true for IoT applications in a wide range of industries, for example, healthcare, consumer devices, and manufacturing. In his session at @ThingsExpo, Lancen LaChance, vice president of product management, IoT solutions at GlobalSign, will teach IoT developers how t...
As the rapid adoption of containers continues, companies are finding that they lack the operational tools to understand the behavior of applications deployed in these containers, and how to identify issues in their application infrastructure. For example, how are multiple containers within an application impacting each other’s performance? If an application’s service is degraded, which container is to blame? In the case of an application outage, what was the root cause of the outage?
Digital payments using wearable devices such as smart watches, fitness trackers, and payment wristbands are an increasing area of focus for industry participants, and consumer acceptance from early trials and deployments has encouraged some of the biggest names in technology and banking to continue their push to drive growth in this nascent market. Wearable payment systems may utilize near field communication (NFC), radio frequency identification (RFID), or quick response (QR) codes and barcodes...
SYS-CON Events announced today that CollabNet (www.collabnet.com) a global leader in enterprise software development and delivery solutions that help customers create high-quality applications at speed, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. The CEO of CollabNet Flint Brenton will also present about DevOps challenges in today’s global, open, and heterogeneous world of software development.
Much of the value of DevOps comes from a (renewed) focus on measurement, sharing, and continuous feedback loops. In increasingly complex DevOps workflows and environments, and especially in larger, regulated, or more crystallized organizations, these core concepts become even more critical. In his session at @DevOpsSummit at 18th Cloud Expo, Andi Mann, Chief Technology Advocate at Splunk, will show how, by focusing on 'metrics that matter,' you can provide objective, transparent, and meaningfu...
SYS-CON Events announced today that Peak 10, Inc., a national IT infrastructure and cloud services provider, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Peak 10 provides reliable, tailored data center and network services, cloud and managed services. Its solutions are designed to scale and adapt to customers’ changing business needs, enabling them to lower costs, improve performance and focus inter...
We're entering the post-smartphone era, where wearable gadgets from watches and fitness bands to glasses and health aids will power the next technological revolution. With mass adoption of wearable devices comes a new data ecosystem that must be protected. Wearables open new pathways that facilitate the tracking, sharing and storing of consumers’ personal health, location and daily activity data. Consumers have some idea of the data these devices capture, but most don’t realize how revealing and...
In the world of DevOps there are ‘known good practices’ – aka ‘patterns’ – and ‘known bad practices’ – aka ‘anti-patterns.' Many of these patterns and anti-patterns have been developed from real world experience, especially by the early adopters of DevOps theory; but many are more feasible in theory than in practice, especially for more recent entrants to the DevOps scene. In this power panel at @DevOpsSummit at 18th Cloud Expo, moderated by DevOps Conference Chair Andi Mann, panelists will dis...
The demand for organizations to expand their infrastructure to multiple IT environments like the cloud, on-premise, mobile, bring your own device (BYOD) and the Internet of Things (IoT) continues to grow. As this hybrid infrastructure increases, the challenge to monitor the security of these systems increases in volume and complexity. In his session at 18th Cloud Expo, Stephen Coty, Chief Security Evangelist at Alert Logic, will show how properly configured and managed security architecture can...
There is an ever-growing explosion of new devices that are connected to the Internet using “cloud” solutions. This rapid growth is creating a massive new demand for efficient access to data. And it’s not just about connecting to that data anymore. This new demand is bringing new issues and challenges and it is important for companies to scale for the coming growth. And with that scaling comes the need for greater security, gathering and data analysis, storage, connectivity and, of course, the...
The IETF draft standard for M2M certificates is a security solution specifically designed for the demanding needs of IoT/M2M applications. In his session at @ThingsExpo, Brian Romansky, VP of Strategic Technology at TrustPoint Innovation, will explain how M2M certificates can efficiently enable confidentiality, integrity, and authenticity on highly constrained devices.
SYS-CON Events announced today the Docker Meets Kubernetes – Intro into the Kubernetes World, being held June 9, 2016, in conjunction with 18th Cloud Expo | @ThingsExpo, at the Javits Center in New York, NY. Register for 'Docker Meets Kubernetes Workshop' Here! This workshop led by Sebastian Scheele, co-founder of Loodse, introduces participants to Kubernetes (container orchestration). Through a combination of instructor-led presentations, demonstrations, and hands-on labs, participants learn ...
See storage differently! Storage performance problems have only gotten worse and harder to solve as applications have become largely virtualized and moved to a cloud-based infrastructure. Storage performance in a virtualized environment is not just about IOPS, it is about how well that potential performance is guaranteed to individual VMs for these apps as the number of VMs keep going up real time. In his session at 18th Cloud Expo, Dhiraj Sehgal, in product and marketing at Tintri, will discu...