TOSHIBA

Toshiba TC86R4400

MIPS RISC High Performance

Microprocessor

Product Brief

TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC

Windows NT

from Microsoft Corporation.

Toshiba is the key supplier of MIPS Reduced Instruction Set

Computing (RISC) technology for the computer system and

embedded control markets. From the introduction of the

, Toshiba has been a foundry for MIPS RISC-based

products. Since then, the R3000, R4000 and R4400 processors

have been gaining wide acceptance and have been designed into a

variety of products by industry-leading companies.

In 1991, Toshiba delivered one of the Þrst R4000 compo-

nents, displaying its strength in advanced process technology

for a wide range of applications while maintaining full software

compatibility with previous generations of MIPS microproces-

sors. Its scalable performance makes it possible to design the

R4400 into applications ranging from embedded controllers, such

as those in satellites and telephone switches, to computers rang-

ing from laptops to mainframe-class servers. In designing the

R4400, the basic components of the central CPU subsystem,

including integer processor, ßoating point co-processor, memory

management unit and primary cache, were integrated onto a sin-

gle chip. In addition, the R4400 includes full multiprocessing

The R4400 family provides a balanced mix in integer and

ßoating point performance. Through superpipelining, RISC opti-

mization techniques and on-chip integration, high integer perfor-

mance is achieved for applications such as databases, graphics,

spreadsheets and word processing. Superpipelining increases

throughput by putting more instructions into the pipeline at the

same time. RISC optimization techniques streamline processing

operations by minimizing interruptions to the steady progress of

the pipeline. In addition, on-chip integration takes more function-

whose beneÞts are conÞned mainly to ßoating-point operations.

This results in higher overall performance from integer and ßoat-

ing-point units, a desirable characteristic in a microprocessor that

is to have broad-based acceptance and applications.

into the MIPS compiler software to run applications faster than

other RISC processors at similar or higher clock speeds. With

RISC, the microprocessor design is streamlined by eliminating

less frequently used instructions and circuitry, shifting the bal-

ance of computing from hardware to compiler software. Compil-

ToshibaÕs R4400SC 64-bit microprocessor and an advanced

operating system, like Windows NT

gives the designer the

an open software environment, are two important achievements

for Toshiba in meeting the mainstream and high-end PC market

needs. The R4400SC operates from 150MHz (input clock 75

MHz) to 250MHz (input clock 125MHz), and can sustain

performance in excess of 175SPECint92.

ToshibaÕs R4400SC is a highly integrated, single-chip RISC

microprocessor designed for high-performance uniprocessor sys-

tems with secondary cache support. The R4400SC provides com-

plete application software compatibility with the MIPS R2000,

32-bit to true 64-bit computing for users and software developers.

¥ True 64-bit microprocessor with 64-bit integer and floating-

¥ Fully compatible with earlier 32-bit MIPS microprocessor.

¥ Dual instruction issue with no restrictions on the type of

¥ Built in primary direct mapped caches with parity protection:

Ð 16KB instruction cache

Ð 16KB data cache

Ð Buffered write back with ConÞgurable 4 or 8 word

line size

Ð The secondary cache can range from 128Kbytes to

Ð 128-bit interface to minimize cache miss latency

In order to achieve the high performance required in a third

R4400SC/MC Multiprocessor

TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC

Toshiba products described in this document are not authorized for use as critical components in life support systems without the written consent of the appropriate

ofÞcer of Toshiba America, Inc. Life support systems are either systems intended for surgical implant in the body or systems which sustain life. A critical component is

any component of a life support system whose failure to perform may cause a malfunction or failure of the life support system, or may affect its safety or effectiveness.

SpeciÞcations and information herein are subject to change without notice.

This technical data may be controlled under U.S. Export Administration Regulations and may be subject to the approval of the U.S. Department of Commerce prior to

export. Any export or re-export, directly or indirectly, in contravention of the U.S. Export Administration Regulations is strictly prohibited.

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