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
SYS-CON Events announced today that SoftLayer, an IBM Company, has been named “Gold Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. SoftLayer, an IBM Company, provides cloud infrastructure as a service from a growing number of data centers and network points of presence around the world. SoftLayer’s customers range from Web startups to global enterprises.
DevOps at Cloud Expo – being held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA – announces that its Call for Papers is open. Born out of proven success in agile development, cloud computing, and process automation, DevOps is a macro trend you cannot afford to miss. From showcase success stories from early adopters and web-scale businesses, DevOps is expanding to organizations of all sizes, including the world's largest enterprises – and delivering real results. Am...
There is little doubt that Big Data solutions will have an increasing role in the Enterprise IT mainstream over time. Big Data at Cloud Expo - to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA - has announced its Call for Papers is open. Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is...
DevOps at Cloud Expo, taking place Nov 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 19th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long dev...
Digital innovation is the next big wave of business transformation based on digital technologies of which IoT and Big Data are key components, For example: Business boundary innovation is a challenge to excavate third-party business value using IoT and BigData, like Nest Business structure innovation may propose re-building business structure from scratch, as Uber does in the taxicab industry The social model innovation is also a big challenge to the new social architecture with the design fr...
Data is an unusual currency; it is not restricted by the same transactional limitations as money or people. In fact, the more that you leverage your data across multiple business use cases, the more valuable it becomes to the organization. And the same can be said about the organization’s analytics. In his session at 19th Cloud Expo, Bill Schmarzo, CTO for the Big Data Practice at EMC, will introduce a methodology for capturing, enriching and sharing data (and analytics) across the organizati...
IoT is fundamentally transforming the auto industry, turning the vehicle into a hub for connected services, including safety, infotainment and usage-based insurance. Auto manufacturers – and businesses across all verticals – have built an entire ecosystem around the Connected Car, creating new customer touch points and revenue streams. In his session at @ThingsExpo, Macario Namie, Head of IoT Strategy at Cisco Jasper, will share real-world examples of how IoT transforms the car from a static p...
The many IoT deployments around the world are busy integrating smart devices and sensors into their enterprise IT infrastructures. Yet all of this technology – and there are an amazing number of choices – is of no use without the software to gather, communicate, and analyze the new data flows. Without software, there is no IT. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will look at the protocols that communicate data and the emerging data analy...
The vision of a connected smart home is becoming reality with the application of integrated wireless technologies in devices and appliances. The use of standardized and TCP/IP networked wireless technologies in line-powered and battery operated sensors and controls has led to the adoption of radios in the 2.4GHz band, including Wi-Fi, BT/BLE and 802.15.4 applied ZigBee and Thread. This is driving the need for robust wireless coexistence for multiple radios to ensure throughput performance and th...
I’m going to cry tonight, long and hard. I’ll do so as I remember and mourn Jeremy Geelan. I knew Jeremy for almost 20 years, from the time he showed up one day at Cloud Expo’s headquarters in Bergen County, New Jersey, and went to work. The show wasn’t called Cloud Expo then, of course – it was still known as Java Edge, a pioneering event that grabbed developers, architects, and enterprise IT users alike for twice-yearly confabs. Jeremy didn’t have a job there, or even a job offer. He was s...
SYS-CON Events announced today that China Unicom will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. China United Network Communications Group Co. Ltd ("China Unicom") was officially established in 2009 on the basis of the merger of former China Netcom and former China Unicom. China Unicom mainly operates a full range of telecommunications services including mobile broadband (GSM, WCDMA, LTE F...
The Transparent Cloud-computing Consortium (abbreviation: T-Cloud Consortium) will conduct research activities into changes in the computing model as a result of collaboration between "device" and "cloud" and the creation of new value and markets through organic data processing High speed and high quality networks, and dramatic improvements in computer processing capabilities, have greatly changed the nature of applications and made the storing and processing of data on the network commonplace.
Video experiences should be unique and exciting! But that doesn’t mean you need to patch all the pieces yourself. Users demand rich and engaging experiences and new ways to connect with you. But creating robust video applications at scale can be complicated, time-consuming and expensive. In his session at @ThingsExpo, Zohar Babin, Vice President of Platform, Ecosystem and Community at Kaltura, will discuss how VPaaS enables you to move fast, creating scalable video experiences that reach your...
In his session at @DevOpsSummit at 19th Cloud Expo, Robert Doyle, lead architect at eCube Systems, will examine the issues and need for an agile infrastructure and show the advantages of capturing developer knowledge in an exportable file for migration into production. He will introduce the use of NXTmonitor, a next-generation DevOps tool that captures application environments, dependencies and start/stop procedures in a portable configuration file with an easy-to-use GUI. In addition to captu...
All clouds are not equal. To succeed in a DevOps context, organizations should plan to develop/deploy apps across a choice of on-premise and public clouds simultaneously depending on the business needs. This is where the concept of the Lean Cloud comes in - resting on the idea that you often need to relocate your app modules over their life cycles for both innovation and operational efficiency in the cloud. In his session at @DevOpsSummit at19th Cloud Expo, Valentin (Val) Bercovici, CTO of So...