Feeds

ARM targets enterprise with 32-core, 1.6TB/sec bandwidth beastie

Think the UK boys are just mobe-chip makers? Been out of town lately?

Boost IT visibility and business value

Updated ARM has released more details about the innards of its cache-coherent on-chip networking scheme for use cases ranging from storage to servers to networking – specifically, its CCN-5xx microarchitecture family and its newest member, the muscular CoreLink CCN-508.

It's been almost exactly 29 years since Acorn Computers' ARM1 chip ran its first code on April 26, 1985. Since then, the company that was soon to become ARM branched out beyond CPUs to IP design for GPUs, microcontrollers, coherent and non-coherent interconnects, memory controllers, system memory management units, interrupt controllers, direct memory access controllers, and more, popping up in products from toys to smart cards to mobile devices to printers to servers.

"You name it, we generally build it," lead architect and ARM Fellow Mike Filippo told attendees at his company's 2014 Tech Day last week in Austin, Texas.

ARM's most recent expansion has been in the enterprise space, with work on high-end servers and networking IP. "In 2010," Filippo said, "we really began to take a hard look at the networking market, and we're getting a lot of interest from networking OEMs."

ARM's broad IP portfolio comes in handy when it's designing complex enterprise-level networking, storage, and server parts; the Cambridge, UK company can wrangle a passel of their own IP blocks into a larger assemblage, and license that überblock to chipmakers hungry to service the enterprise market.

And that's what ARM is doing with its CCN-5xx family of high-performance cache-coherent on-chip networking IP. The first product in the family was announced last year: the CoreLink CCN-504, and the newest member is the CoreLink CCN-508. ARM also has plans to not only create a scaled-up, higher-performance family member, but also to move in the opposite direction and create a more modest CCN-5xx for low-end servers and networking.

Each member of the family has a similar scalable topology and microarchitecture, and is based on version five of the advanced microcontroller bus architecture coherent hub interface (AMBA 5 CHI). AMBA is an open-standard on-chip interconnect specification first incarnated by ARM back in the mid-1990s, and is used to tie together different functional blocks such as those, for example, that comprise a system-on-chip (SoC) part.

AMBA 5 CHI: architectural scalability slide

At version five, li'l AMBA's now all grown up (click to enlarge)

The AMBA 5 CHI's architecture is topology-agnostic, able to support anything from point-to-point to mesh, and for the CCN-5xx product family, ARM chose a ring bus over which it works its high-speed element-to-element communication chores.

"Generally speaking," said Filippo, "the architecture was built and designed around scalability, scalability in all aspects: scalability of performance, scalability of design complexity, scalability of power, etcetera." And, apparently, scalability in the use of the word "scalability."

By way of example, the CoreLink CCN-508 scales up from its CCN-504 predecessor, allowing its licensees – ARM prefers the term "partners" – to hang onto it a veritable Noah's Ark of functional units: CPUs, DDR3 or DDR4 memory controllers, network interconnects, memory management units, and up to 24 AMBA interconnects for such peripherals as PCIe, SATA, and 10-40 gigabit Ethernet.

Actually, Noah's Ark isn't all that good an analogy, seeing as how the CCN-508 can bring onboard more than that old guy's limit of two of a kind. It will, for example, support up eight 64-bit ARMv8 CPU clusters of four cores apiece – each cluster could, for example, contain two beefy ARM Cortex-57 and two lightweight ARM Cortex A-53 cores in a big.LITTLE configuration*. Easy math: 32 cores, a doubling of the CCN-504's 16-core max.

Block diagram of ARM's CoreLink CCH-508

Here's one ARM implementation that you're not likely to find in your handset (click to enlarge)

In any case, what's of most interest in ARM's new multi-IP mashup is the way in which all its blocks communicate at high speed thanks to the CoreLink CCN-5xx family's modular, highly distributed microarchitecture. First off, the smarts that manage its transport layer are fully distributed, with no point of centralization; multiple modular "crosspoints" know everything they need to know to take data coming in from whatever source and route it to where it needs to go.

The whole system can run at CPU clock speed, so no core should be kept waiting long for the bits and bytes awaiting duty in a shared, distributed, global L3 cache. But this is not your father's CPU-centric L3 cache – this L3 has a few tricks up its sleeve.

* Update

After this article was a published, ARM got in touch with us with a clarification: the CCN-5xx architecture doesn't support a big.LITTLE configuration in its compute clusters; each max-of-four-cores cluster contains either Cortex-A57 or Cortex-A53 cores, just not both in the same cluster.

The essential guide to IT transformation

More from The Register

next story
Top Gun display for your CAR: Heads-up fighter pilot tech
Sadly Navdy kit doesn't include Sidewinder missile to blast traffic
Apple takes blade to 13-inch MacBook Pro with Retina display
Shaves price, not screen on mid-2014 model
FEAST YOUR EYES: Samsung's Galaxy Alpha has an 'entirely new appearance'
Wow, it looks like nothing else on the market, for sure
iPhone 6 flip tip slips in Aussie's clip: Apple's 'reversible USB' leaks
New plug not compatible with official Type-C, according to fresh rumors
TV transport tech, part 1: From server to sofa at the touch of a button
You won't believe how much goes into today's telly tech
YES YES YES! Apple patents mousy, pressure-sensing iVibrator
Fanbois prepare to experience the great Cupertin-O
NVIDIA claims first 64-bit ARMv8 SoC for Androids
Mile-High 'Denver' Tegra K1 successor said to rival PC performance
XBOX One will learn to play media from USB and DLNA sources
Hang on? Aren't those file formats you hardly ever see outside torrents?
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.