Cadence® system design and verification solutions, integrated under our System Development Suite, provide the simulation, acceleration, emulation, and management capabilities.
System Development Suite Related Products A-Z
Cadence® digital design and signoff solutions provide a fast path to design closure and better predictability, helping you meet your power, performance, and area (PPA) targets.
Full-Flow Digital Solution Related Products A-Z
Cadence® custom, analog, and RF design solutions can help you save time by automating many routine tasks, from block-level and mixed-signal simulation to routing and library characterization.
Overview Related Products A-Z
Driving efficiency and accuracy in advanced packaging, system planning, and multi-fabric interoperability, Cadence® package implementation products deliver the automation and accuracy.
Cadence® PCB design solutions enable shorter, more predictable design cycles with greater integration of component design and system-level simulation for a constraint-driven flow.
An open IP platform for you to customize your app-driven SoC design.
Comprehensive solutions and methodologies.
Helping you meet your broader business goals.
A global customer support infrastructure with around-the-clock help.
24/7 Support - Cadence Online Support
Locate the latest software updates, service request, technical documentation, solutions and more in your personalized environment.
Cadence offers various software services for download. This page describes our offerings, including the Allegro FREE Physical Viewer.
The Cadence Academic Network helps build strong relationships between academia and industry, and promotes the proliferation of leading-edge technologies and methodologies at universities renowned for their engineering and design excellence.
Participate in CDNLive
A huge knowledge exchange platform for academia to network with industry. We are looking for academic speakers to talk about their research to the industry attendees at the Academic Track at CDNLive EMEA and Silicon Valley.
Come & Meet Us @ Events
A huge knowledge exchange platform for academia. We are looking for academic speakers to talk about their research to industry attendees.
Americas University Software Program
Join the 250+ qualified Americas member universities who have already incorporated Cadence EDA software into their classrooms and academic research projects.
EMEA University Software Program
In EMEA, Cadence works with EUROPRACTICE to ensure cost-effective availability of our extensive electronic design automation (EDA) tools for non-commercial activities.
Apply Now For Jobs
If you are a recent college graduate or a student looking for internship. Visit our exclusive job search page for interns and recent college graduate jobs.
Cadence is a Great Place to do great work
Learn more about our internship program and visit our careers page to do meaningful work and make a great impact.
Get the most out of your investment in Cadence technologies through a wide range of training offerings.
Overview All Courses Asia Pacific EMEANorth America
Instructor-led training [ILT] are live classes that are offered in our state-of-the-art classrooms at our worldwide training centers, at your site, or as a Virtual classroom.
Online Training is delivered over the web to let you proceed at your own pace, anytime and anywhere.
Exchange ideas, news, technical information, and best practices.
The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information.
It's not all about the technlogy. Here we exchange ideas on the Cadence Academic Network and other subjects of general interest.
Cadence is a leading provider of system design tools, software, IP, and services.
Get email delivery of the Cadence blog featured here
Two emerging protocol storage standards - Non-Volatile Memory Express (NVM Express or NVMe) and 12 Gbit/second Serial Attached SCSI (SAS) - are set to play a crucial role in the future of personal and cloud computing. As a result, Cadence has announced verification IP (VIP) support for these protocols. Here's some background about the new standards and why they are important.
Both NVM Express and 12Gb/s SAS support high-performance solid state drives (SSDs), enabling both personal computers and enterprise-level servers to move to the faster throughput SSDs allow. To put things in context, however, storage protocols are only one type of standard interface that's needed to support cloud computing. Memory, fabric, and networking protocols are also required. The diagram below provides a broad view of interface standards needed for cloud computing; those marked in red are new within the past 18 months.
In brief, NVM Express is a storage protocol for connecting SSDs and controllers. It will be deployed on the client side with PCs (notebooks, Ultrabooks), but the technology is also expected to move up to the enterprise level. SAS is a protocol for connecting enterprise-level storage systems, and 12Gb/s SAS is its latest iteration, with double the speed of the previous 6Gb/s specification. Both of these new protocols reflect the need to store and quickly move massive amounts of data in and out of the cloud, and a belief that current 6Gb/s SAS and Serial ATA (SATA) protocols are running out of steam for this purpose.
About NVM Express
The NVM Express specification was released in March 2011 by the NVMe Work Group, whose web site is a good source of information about the standard. NVM Express 1.0 defines an optimized register interface, command set, and feature set for PCI Express SSDs. Its goal is to provide a scalable interface that unlocks the potential of PCIe-based SSDs now and into the future. NVM Express supports multi-core architectures, and for enterprise class solutions, it supports end-to-end data protection, security and encryption capabilities.
As a whitepaper at the NVMe Work Group site notes, there is an increasing gap in the price/performance of DRAM and hard drives. NVM in the form of SSDs is filling this gap, and PCIe SSDs are being delivered to the market today. PCIe is the highest performance I/O interface available today, delivering 8 GB/s per lane with PCIe Gen3.
According to Tom Hackett, product marketing manager for VIP at Cadence, NVM Express will be "absolutely critical for enabling SSDs in notebook and Ultrabook computers. The PC industry must make that happen to survive, and to keep everybody from just using tablets." He also noted that an emerging enterprise-level standard - SCSI over PCIe, or SOP - is a new competing standard to NVM Express with its own advantages for the enterprise market.
Will the combination of PCIe and NVM Express replace SATA? The jury is still out on that, said Erik Panu, vice president of R&D for the System and Software Realization group at Cadence. "I do expect SATA designs to continue for a while, and I think SATA has a higher layer will exist going forward," he said.
About 12Gb/s SAS
While your PC today uses a SATA drive, the enterprise world uses SAS drives. According to Hackett, SAS drivers "deliver higher throughput, they are more reliable, and they have system management functions built in. They are a lot more sophisticated [than SATA] and they are also more expensive. SAS is used in the enterprise world for servers just like SATA is used in all consumer PCs."
Another difference between SAS and SATA, he noted, is that SAS is not only used to connect computers to hard drives, but is also used to connect multiple servers to fabrics of switches and storage cabinets. 12Gb/s is needed, Hackett said, because SSDs today are starting to exceed the 6Gb/s bandwidth currently allowed by both SATA and the previous SAS specification.
The SCSI Trade Association promotes SAS and has further information at its web site. A recent posting notes that 12Gb/s will improve the SAS dollars/gigabit/watt consumed, making it one of the most efficient high-performance interconnect solutions for enterprise storage devices. The article notes that initial adoption is expected in two primary areas: low-latency, high-performance SSDs, and high-performance connectivity that supports tiering and storage build-outs. As 12Gb/s SAS hard disk drives (HDDs) become available, a second wave of adoption will occur.
Why VIP Matters
So, how will verification IP speed the adoption of these new protocols? NVM Express and 12Gb/s SAS are extremely complex, with complicated data transformations and data routing, Panu said. Data is packaged at different levels of abstraction, making checking very difficult. The storage industry is struggling to adopt both of these new interfaces and verification is a big concern.
"Verification teams typically only start to learn about the new protocols about a month ahead of when they're asked to start coding their testbenches. It's nuts," Hackett said. "How can they go from ground zero to be able to verify one of these complex protocols? They can't do it, they have to have canned expertise. VIP helps people rapidly capture the expertise needed to verify these interfaces, which allows verification teams to ramp up very quickly."
While NVM Express and 12Gb/s SAS are new additions to the Cadence VIP Catalog, Cadence already offers VIP for many other interfaces needed to support cloud computing - including, in fact, all of the interfaces listed in the diagram shown earlier in this post. Cadence offers VIP for over 40 interface protocols and 6,000 memory models.
For a "best practices" guide on how to select and use commercial VIP, click here. A good resource to learn the basics of SSD verification can be found in the "Solid State Drive Verification" presentation on this web page.