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To: Dwight E. Karlsen who wrote (9046)11/12/1997 2:41:00 AM
From: Scrapps  Respond to of 22053
 
Cirrus Logic Announces New Four-Channel Communications Controller to Support Emerging 56K Modems
New Highly-Integrated Controller Enhances Wide Area Network Modem Applications
FREMONT, Calif.--(BUSINESS WIRE)--Nov. 11, 1997-- Cirrus Logic Inc. (NASDAQ:CRUS - news) today announced a new member of its multi-protocol family of four-channel communications controllers.

Optimized for remote access communications, the new CL-CD2481 supports the popular point-to-point protocol (PPP) to enhance today's wide area network (WAN) modem applications.

With its support for the popular PPP, the new device allows end-users to link to physically distant local area networks (LANs) over existing telephone lines at speeds of up to 56 Kbps, making the CL-CD2481 a powerful cost-effective solution for WAN connectivity.

''Analog modem-based internetworking has become a popular, efficient and relatively inexpensive networking solution for telecommuters,'' said Mike Leung, vice president of strategic marketing and business manager for access products for Cirrus Logic's Communications Products Division.

''However, as the telecommuting population continues to grow, so does the demand for higher system throughput. Our product's high-performance architecture addresses this issue and enables the user to take full advantage of today's high-speed 56K modems.''

The performance advantages provided by the CL-CD2481 are derived from a unique set of features that include hardware PPP support, 230.4 Kbps data transfer rate, double-buffered on-chip direct memory access (DMA) master, deep on-chip FIFO and an embedded RISC processor.

These high-performance features work together to significantly boost system efficiency and reduce CPU overhead, enabling remote access manufacturers to design routers and servers that support greater channel density and higher system throughput.

Improved Performance, Greater Channel Density

The CL-CD2481 significantly reduces CPU overhead and improves system performance by processing a few specific PPP functions (per RFC 1661/1662) in hardware. As a result of the additional CPU bandwidth made available by the new device, remote access equipment manufacturers can increase the number of channels they build into their servers or add increased functionality to their products.

High-Performance Features

With its 230.4 Kbps data transfer rate, Cirrus Logic's new chip can support four 56K modem connections simultaneously to deliver the high system throughput that remote access manufacturers are demanding.

In addition, the on-chip master DMA provides ''fire-and-forget'' data movement support, which requires minimal interrupt processing by the CPU. DMA efficiency is further optimized by threshold-programmable, 16 byte-deep transmit and receive FIFOs.

The new device's integrated RISC processor provides the intelligence to perform all time-critical CPU processing functions. This highly integrated solution implements all of these advanced features on a single-chip, delivering an efficient, reliable and high-speed communications device to the emerging remote access market.

Market Momentum

The CL-CD2481's advanced features and attractive price point have enabled the device to gain rapid market acceptance. In fact, the new device has already been designed into Cisco Systems' recently introduced AS5300 universal access servers and Racal Data Group's WINhub RASMega -- an ultra high-performance, carrier-class integrated Internet and remote access server combining high-density remote access with an optional integrated high-performance computer platform.

Manufacturing, Packaging, Pricing and Availability

The CL-CD2481 multi-protocol communications controller is packaged in a 100-pin plastic quad flat pack (PQFP). Sample and production quantities are currently available priced at $28 each in quantities of 1,000.

Communication Solutions from Cirrus Logic

Cirrus Logic is a leading supplier of innovative semiconductor solutions for the enterprise and wide area networking markets. The company's Communication Products Division is committed to maintaining leadership in its core areas, such as T1/E1, Ethernet, Broadband Access and Protocol Engine products.

The division applies its Crystal SmartAnalog technology to physical layer transceiver applications, including T1/E1 and 10BASE-T. The division's customers include major suppliers of data communications and telecommunications infrastructure systems.

Cirrus Logic

Cirrus Logic is a premier supplier of system-level integrated circuits that demand high-performance mixed-signal processing. The company applies its system expertise to enable high-volume applications in data storage, networking, and multimedia for both computing and consumer electronics markets as well as ultra-high-precision data acquisition applications for industrial automation and instrumentation markets.

NOTE TO EDITORS: Cirrus Logic is a registered trademark and SmartAnalog and Crystal are trademarks of Cirrus Logic Inc. Racal and WINhub are trademarks of Racal Electronics Plc. All other product names noted herein may be trademarks of their respective holders.

Cirrus Logic news releases may be obtained by fax by dialing 800/359-6414, or by dialing 510/249-4200 from outside the United States, or via the Internet on the world wide web at cirrus.com