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参数资料
| 型号： | TC86R4600 |
| 厂商： | Toshiba Corporation |
| 英文描述： | 64 Bit RISC Microprocessor(64位精简指令集微处理器) |
| 中文描述： | 64位RISC微处理器（64位精简指令集微处理器） |
| 文件页数： | 4/30页 |
| 文件大小： | 267K |
| 代理商： | TC86R4600 |
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TC86R4600 64-bit RISC Microprocessor
2
T O S H IB A A M E R IC A E L E C T R O N IC C O M P O N E N T S , IN C
.
Figure 2. Typical System Block Diagram
Memory I/O
Controller
64
Boot
EPROM
DRAM
(80ns)
L2
Cache
(Optional)
TC86R4600
64
64
64
9
2
11
SCSI
16
ENET
32
Address
Control
Description
The R4600 supports a wide variety of processor based
applications, from 32-bit desktop or notebook systems through
high-performance, 64-bit OLTP systems. Compatible with the
TC86R4400PC family for both hardware and software, the
R4600 will serve in many of the same applications, but in addi-
tion supports low-power operation for applications such as note-
book computers. It does not provide integrated secondary cache
and multiprocessor support as found in the R4000SC and
R4000MC, but it is possible to build an external secondary cache.
However, the large on-chip two-way set associative caches make
this unnecessary for most applications.
The R4600 brings R4000SC performance levels to the
R4000PC package, while at the same time providing lower cost
and lower power requirements. These performance levels are
achieved by providing larger on-chip caches that are two-way set
associative, fewer pipeline stalls, and early restart for data cache
misses. The result is 68 SPECint92 and 60 SPECfp92 (exact
Tgures are system dependent) for 100MHz devices.
The R4600 provides complete upward application-software
compatibility with the TC85R3000 family of microprocessors as
well as the TC86R4000 family of microprocessors. Microsoft
Windows NT and UNISOFT Unix V.4 operating systems insure
the availability of thousands of applications programs, geared
to provide a complete solution to a large number of processing
needs. An array of development tools facilitates the rapid devel-
opment of R4600-based systems, enabling a wide variety of
customers to take advantage of the MIPS Open Architecture
philosophy.
Together with the R4000 family, the R4600 provides a com-
patible, timely, and necessary evolution path from 32-bit to true
64-bit computing. The original design objectives of the R4000
clearly mandated this evolution path; the result is a true 64-bit
processor fully compatible with 32-bit operating systems and
applications.
The 64-bit computing and addressing capability of the
R4600 enables a wide variety of capabilities previously limited
by a smaller address space. For example, the large address space
allows operating systems with extensive Tle mapping; direct
access to large Tles can occur without explicit I/O calls. Applica-
tions such as large CAD databases, multi-media, and high-quality
image storage and retrieval all directly beneTt from the enlarged
address space.
This data sheet provides an overview of the features and
architecture of the R4600 CPU. Further information on develop-
ment support, application notes, and complementary products are
also available from your local Toshiba sales representative.
Hardware Overview
The R4600 family brings a high level of integration designed for
high-performance computing. The key elements of the R4600 are
briey described below.
Pipeline
The R4600 uses a 5-stage pipeline similar to the R3000. The
simplicity of this pipeline allows the R4600 to be lower cost
and lower power than super-scalar or super-pipelined processors.
Unlike the R3000, the R4600 does virtual to physical address
translation in parallel with cache access. This allows the R4600
to operate at twice the frequency of the R3000 and to support a
larger TLB for address translation.
Compared to the 8-stage R4000 pipeline, the R4600 is more
efTcient (requires fewer stalls).
Figure 3 on page 3 shows the R4600 pipeline.
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