Toshiba Unveils EEMBC Benchmark Scores for TX4939 Microprocessor

Results Corroborate That the 400MHz TX4939 Delivers Better Performance at Lower Clock Rates Than Similar-Class Processors for Digital-Consumer Applications With Networking

SAN JOSE, Calif., Aug. 22 // -- Toshiba America Electronic Components, Inc. (TAEC)* today announced that certified benchmark scores from the Embedded Microprocessor Benchmark Consortium (EEMBC®) are now available for its TX4939XBG-400 microprocessor, the latest member of the Toshiba TX49 MIPS® RISC microprocessor family. The device was tested against the EEMBC Networking Version 1.1 and Version 2.0 benchmark suites and the results substantiate the processor's high-performance system architecture and benefits for digital-consumer applications that include networking. The results can be viewed at

Using the EEMBC Networking Version 1.1 silicon benchmark, the TX4939 with a Netmark(TM) score of 7.1 currently ranks as the best-in-class processor when compared to similar processors with up to 532 megahertz (MHz) performance. Using the EEMBC Networking Version 2.0 silicon benchmark, the TX4939 achieved a TCPmark(TM) of 83.1 and an IPmark(TM) of 58.6, 20 percent higher at present than the nearest published EEMBC values for a comparable device.

"These excellent scores can be attributed to the benefits of the 64-bit-wide TX49/H4 CPU core, and to the TX4939's high-throughput system-level design and DDR memory. The TX4939 is ideally suited for digital-consumer applications such as gateways and IP set-top boxes that need good networking performance combined with a wide range of peripherals," said Shardul Kazi, vice president of the ASSP Business Unit at TAEC. "Toshiba is a strong supporter of EEMBC and believe its detailed score reports provide OEMs with an objective tool to help them select the optimal processor for a particular application."

"In publishing its certified EEMBC benchmark scores, Toshiba is showing its commitment to providing customers with valuable, trustworthy information on processor performance that can play an instrumental role in helping designers to choose the right device for their application," said Markus Levy, EEMBC president. "As these TX4939 scores show, there are several dimensions to processor performance, and the most important is how well the processor does in getting the job done with the most efficiency."

About the TX4939

The TX4939XBG-400 microprocessor incorporates a 64-bit MIPS RISC CPU with 32-bit MAC (multiply/accumulate) support. It also includes an IEEE754-compliant single/double precision FPU. The TX4939 supports the MIPS I, II and III instruction-set architecture and is fully code-compatible with other microprocessors in the TX49 family. The TX4939 CPU core incorporates 32KB each of 4-way set-associative instruction and data caches. The processor operates at 400MHz and typically dissipates 1 watt of power.

The TX4939 has multiple on-chip peripheral functions, including an 8/16-bit local bus controller, a highly optimized security engine that supports DES/3DES/AES/MD5/SHA1 algorithms, serial/parallel video ports that support ITU-R 656 video format, ATA controllers, a DDR SDRAM controller, a NAND flash controller, Ethernet MAC controllers (RMII), a PCI controller, a DMA controller, an interrupt controller, an AC-link controller, serial and parallel ports, timers/counters and a real-time clock (RTC) with battery back-up support. The TX4939 requires a 1.25V power supply for the core, 2.5V for the DDR interface and 3.3V for I/O. The chip is housed in a 456-pin PBGA package with 1mm ball pitch. Thirty-six pins are used as thermal balls for heat dissipation. The development environment for the TX4939 consists of an evaluation board with PCI, ISA, audio and video connectors for easy third-party board add-ons. This evaluation board supports complete real-time OS and software-development tool chains.

*About TAEC

Combining quality and flexibility with design engineering expertise, TAEC brings a breadth of advanced, next-generation technologies to its customers. This broad offering includes memory and flash memory-based storage solutions, a broad range of discrete devices, displays, medical tubes, ASICs, custom SOCs, microprocessors, microcontrollers and wireless components for the computing, wireless, networking, automotive and digital consumer markets.

TAEC is an independent operating company owned by Toshiba America, Inc., a subsidiary of Toshiba Corp. (Toshiba), Japan's largest semiconductor manufacturer and the world's fourth largest semiconductor manufacturer. In more than 130 years of operation, Toshiba has recorded numerous firsts and made many valuable contributions to technology and society. For additional company and product information, please visit TAEC's website at For technical inquiries, please e-mail

Source: Toshiba America Electronic Components, Inc.

Deborah Chalmers
Toshiba America Electronic Components, Inc.,

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