Rambus Brand Guidelines: RDRAM, Patent Battles & Memory Interface Chips

Two engineers and a faster memory channel.

Rambus was founded in March 1990 by the engineers Mike Farmwald and Mark Horowitz, English Wikipedia says, with early backing from venture investors including Kleiner Perkins Caufield & Byers and Mohr Davidow Ventures. It was set up as a California company, later reincorporated in Delaware, and went public on Nasdaq in 1997 under the ticker RMBS.

Its idea was a very fast chip-to-chip interface for dynamic random-access memory. Instead of the separate address and control lines of conventional memory, Rambus sent information in packets over a narrow channel, an approach Wikipedia describes as a packet-oriented bus. Toshiba implemented the design in 1993. Rambus did not build memory itself: it licensed its interface to memory makers, processor designers and chipset suppliers, and supplied them with reference designs and engineering services. Wikipedia lists licensees including Intel, NEC, Hitachi, IBM, Silicon Graphics and Nintendo.

The result was RDRAM. An early version went into the Nintendo 64 in 1996; later versions appeared in Intel’s PC memory chipsets, in Silicon Graphics workstations and in Creative Labs graphics cards. Wikipedia also notes the trade-offs critics raised, including latency, heat and manufacturing cost, with heat sinks fitted to RDRAM modules. In 2003 Rambus announced that Toshiba and Elpida Memory would produce its next design, XDR DRAM, which was later used in Sony’s PlayStation 3.

In the early 1990s Rambus had also joined JEDEC, the standards body that sets memory specifications for the industry. It withdrew in 1995. Its conduct at JEDEC in those years later became central to the legal disputes that followed.

Twenty years in court, then settlement.

In 2000 Rambus began suing large memory manufacturers, claiming that its patents covered SDRAM and DDR memory. Several makers settled and agreed to pay royalties. Others fought. In a Virginia trial against Infineon, a jury found Rambus liable for fraud in May 2001, but the US Court of Appeals for the Federal Circuit overturned that verdict in January 2003 and sent the infringement case back for retrial. In 2005 the court dismissed Rambus’s case against Infineon after finding that Rambus had destroyed relevant documents, and the two companies then settled. In January 2009 a federal judge in Delaware ruled that Rambus could not enforce its patents against Micron because of that destruction of evidence, Wikipedia records.

Regulators took up the JEDEC question too. The US Federal Trade Commission brought antitrust charges in 2002. An administrative judge dismissed them in 2006; the Commission reversed that ruling in August 2006 and in February 2007 ordered limits on the royalties Rambus could charge. In April 2008 the US Court of Appeals for the D.C. Circuit overturned the FTC decision, and in February 2009 the Supreme Court declined the FTC’s appeal. In Europe, the European Commission sent Rambus a Statement of Objections on 30 July 2007 over what it called a possible “patent ambush.” On 9 December 2009 the Commission made binding commitments Rambus had offered: a worldwide cap on its royalty rates for JEDEC-compliant memory for five years, and zero royalties for the SDR and DDR standards adopted while Rambus was a JEDEC member.

The cases did not all go one way. In November 2011 a San Francisco jury ruled against Rambus in its antitrust suit against Micron and Hynix. Rambus then settled its remaining long-running disputes: with SK Hynix in June 2013, with Micron in December 2013 and with Nanya in March 2014. Rambus said these agreements were part of a shift to a less litigious, more collaborative approach.

Design and documentation.

Chip-design software and semiconductor IP are hard things to picture. The products are programs, licences and blocks of circuitry that customers place inside their own chips, so the companies that sell them have to borrow images from the work itself. The most common is the chip floor-plan: a die seen from above, its functional blocks lit in bright colour, or the stacked metal routing layers of a layout drawn as glowing lines on a dark ground.

Abstract circuit lines do much of the remaining work. Thin traces, right-angled paths and grids of contact points stand in for a product that no one can hold, and they travel easily from a website banner to a trade-show wall. Alongside them come pictures of people at work: engineers in front of multi-monitor layouts, waveforms and schematics on the screens, the design shown in progress rather than finished.

The trade has its own stages. The Design Automation Conference is where, according to English Wikipedia, Mentor Graphics introduced its first product in 1982, and booths there and at the RISC-V Summit carry the same chip renders, circuit patterns and demonstration screens. Keynote stages follow a familiar pattern too: a chief executive in front of a roadmap slide, with process nodes, product generations and partner names set out across the screen.

This guide looks past those shared images to what can be checked about each company: who founded it, who owns it now, which tools or IP it is known for, and which events in its history — mergers, takeovers, export-control cases — shaped the name it trades under. Where a claim rests only on a company’s own word, we say so.

From licensing to chips and silicon IP.

Through the 2010s Rambus widened what it sold. It bought Cryptography Research in June 2011, adding content-protection and security technology, then picked up Integrion Microelectronics of Toronto in 2015, opening its first Canadian office. In 2016 it acquired Semtech’s Snowbush IP and Inphi’s memory interconnect business. AnalogX and PLDA, specialists in PCI Express and CXL links, followed in 2021, and Hardent of Montreal in May 2022. In 2019 Rambus announced it would move its headquarters from Sunnyvale to North San Jose.

It also let part of its portfolio go. On 7 September 2023 Rambus announced from San Jose that it had completed the sale of its PHY IP business to Cadence Design Systems, saying the move sharpened its focus on chips and digital IP, including memory solutions for data centres and AI. Today the company describes itself as a provider of chips and silicon IP “making data faster and safer.” Its chip range includes DDR5 server DIMM chipsets and client chipsets for newer laptop memory modules, and its silicon IP covers interfaces such as PCI Express, CXL and HBM alongside security IP.

The Rambus name has carried two meanings over its history: a fast memory channel in game consoles and PCs, and for many years a byword for patent litigation in the memory industry.

For a design guide, Rambus shows how a technology licensor can rebuild its brand around products after years in court. Compare Cadence Design Systems, which bought its PHY IP business, and Intel, an early RDRAM licensee. For this guide we use a deep navy, haze and copper with a sans, an unofficial interpretation; no product or logo is reproduced.

Keep Rambus’s identity on hand — save it to a board in the Made Good inspiration library.