Rambus RaSer Family of Serial Interface Products Licensed to eSilicon

Provides customers access to leading IP, design and manufacturing services for advanced computing and communications applications

Los Altos,CA - June 23, 2003 - Rambus Inc. (Nasdaq:RMBS), a leading developer of chip-to-chip interface products and services, and eSilicon Corporation, www.eSilicon.com, a leading fabless custom chip company, today announced that eSilicon has signed a multi-year licensing agreement for the Rambus RaSer(tm) family of serial interface products. eSilicon will offer 1 - 3.2 Gbps RaSer physical layer (PHY) cells to its customers for advanced computing and communications applications.

"Customers come to eSilicon for the best in IP, design and manufacturing services," said Prasad Subramaniam, vice president of design technology at eSilicon. "The addition of Rambus' leading RaSer interface solutions to our IP portfolio reduces our customers' development costs, while providing faster time-to-market with the industry's most advanced, silicon-verified serial link technology."

eSilicon is exploiting the trend toward strategic outsourcing in the semiconductor marketplace by offering a one-stop shop to select and procure IP components that can be incorporated quickly into customer designs. eSilicon offers a flexible customer engagement model providing a variety of design and manufacturing services to enable design implementation and the delivery of working silicon.

"ASIC and ASSP designers will now be able to access our interface products through eSilicon's design and manufacturing services," said Kevin Donnelly, vice president of the Logic Interface Division at Rambus. "eSilicon has brought together all of the critical aspects of IC design and manufacturing in a streamlined business process that enables companies to move from concept to delivery of packaged, tested chips quickly and cost-efficiently."
To keep up the pace of processor and system performance, chip interconnections are moving to high-speed multi-gigabit serial interfaces. Serial interfaces are being adopted for chip interconnects in mainstream PC and server systems. The PCI Express interface standard, for example, is poised to become the next generation PCI bus replacement.

Rambus RaSer Serial Interface Products

The Rambus RaSer family of interface products includes scalable, application-proven, standard-compatible and new higher performance serial link hard macro cells. Seamlessly integrated in ASIC or ASSP controller chips, the RaSer products eliminate the need for stand-alone serial link components thereby reducing system costs, saving power and board area. RaSer cells are available in TSMC's 0.18- and 0.13-micron processes, and are used in network equipment backplanes, InfiniBand(tm), Gigabit Ethernet, 10-Gigabit Ethernet XAUI, PCI Express and other serial link applications. The low power and small die size of the Rambus PCI Express cell enables optimal solutions for high-lane switches and PC chipsets.

RaSer serial interface products will provide eSilicon's customers a range of high-bandwidth, low-cost, low-power solutions that achieve new levels of flexibility and scalability in computing, networking, server and storage applications.

About eSilicon Corporation

eSilicon Corporation is a full-service provider of custom chips to the world?s leading electronics companies. Founded in 2000, the company's unique approach manages every step of the IC development process - from specification through manufacturing and delivery of packaged and tested parts. eSilicon offers value-added design and manufacturing expertise, with an ebusiness infrastructure that provides significant visibility, predictability and time-to-market advantages. Headquartered in Sunnyvale, CA with offices in Allentown, PA, and Murray Hill, NJ, eSilicon has approximately 80 employees. For more information about eSilicon, visit www.esilicon.com

About Rambus
Rambus is a leading provider of chip-to-chip interface products and services. The company's breakthrough technology and engineering expertise have helped leading chip and system companies to solve their challenging I/O problems and bring industry-leading products to market. Rambus' interface solutions can be found in numerous computing, consumer electronic and networking products. Additional information is available at www.rambus.com

Rambus is a registered trademark and RaSer is a trademark of Rambus Inc. PCI Express is a trademark of the Peripheral Component Interconnect Special Interest Group. All other trademarks are properties of their respective owners.

Note to Editors:
On June 2, Rambus announced the sampling and availability of the industry's first test chips with the RaSer PHY cell for PCI Express applications. For more information about RaSer technology and its use in PCI Express and backplane and other applications, visit www.rambus.com/products/raser/pciexpress/