IDT79R4650-200DP View Datasheet(PDF) - Integrated Device Technology
Part Name
Description
Manufacturer
IDT79R4650-200DP Datasheet PDF : 25 Pages
| |||
IDT79RC4650™
Description
The IDT79RC4650 is a low-cost member of the IDT Microprocessor
family, targeted to a variety of performance-hungry embedded applica-
tions. The RC4650 continues the IDT tradition of high-performance
through high-speed pipelines, high-bandwidth caches and bus interface,
64-bit architecture, and careful attention to efficient control. The RC4650
reduces the cost of this performance relative to the RC4700 by removing
functional units that are frequently unneeded for many embedded appli-
cations, such as double-precision floating point arithmetic and a TLB.
The RC4650 adds features relative to the RC4700, reflective of its
target applications. These features enable system cost reduction (e.g.,
optional 32-bit system interface) as well as higher performance for
certain types of systems (e.g., cache locking, improved real-time
support, integer DSP capability).
The RC4650 supports a wide variety of embedded processor-based
applications, such as consumer game systems, multi-media functions,
internetworking equipment, switching equipment, and printing systems.
Upwardly software-compatible with the RC3000 family, and bus- and
upwardly software-compatible with the IDT RC4000/RC5000 family, the
RC4650 will serve in many of the same applications, but, in addition
supports other applications such as those requiring integer DSP func-
tions.
The RC64475 and RC64575 processors offer a direct migration path
for designs based on IDT’s RC4650 processors, through full pin and
socket compatibility.
The RC4650 brings 64-bit performance levels to lower cost systems.
High performance is preserved by retaining large on-chip caches that
are two-way set associative, a streamlined high-speed pipeline, high-
bandwidth, 64-bit execution, and facilities such as early restart for data
cache misses. These techniques combine to allow the system designer
3.2GB/sec aggregate bandwidth, 1000 MB/sec bus bandwidth, 352
Dhrystone MIPS, 89 MFlops, and 133.5 M Multiply-add/second.
The RC4650 provides complete upward application-software
compatibility with the IDT79RC32300™ and IDT79RC64xxx™ families of
microprocessors. An array of development tools facilitates the rapid
development of RC4650-based systems, enabling a wide variety of
customers to take advantage of the high-performance capabilities of the
processor while maintaining short time to market goals.
The 64-bit computing capability of the RC4650 enables a wide
variety of capabilities previously limited by the lower bandwidth and bit-
manipulation rates inherent in 32-bit architectures. For example, the
RC4650 can perform loads and stores from cached memory at the rate
of 8-bytes every clock cycle, doubling the bandwidth of an equivalent 32-
bit processor. This capability, coupled with the high clock rate for the
RC4650 pipeline, enables new levels of performance to be obtained
from embedded systems.
This data sheet provides an overview of the features and architecture
of the RC4650 CPU. A more detailed description of the processor is
available in the IDT79RC4650 Processor Hardware User’s Manual,
available from IDT. Further information on development support, appli-
cations notes, and complementary products are also available from your
local IDT sales representative.
Hardware Overview
The RC4650 family brings a high-level of integration designed for
high-performance computing. The key elements of the RC4650 are
briefly described below. A more detailed description of each of these
subsystems is available in the User’s Manual.
Pipeline
The RC4650 uses a 5-stage pipeline similar to the IDT79RC3000
and the IDT79RC4700. The simplicity of this pipeline allows the RC4650
to be lower cost and lower power than super-scalar or super-pipelined
processors. Unlike superscalar processors, applications that have large
data dependencies or that require a great deal of load/stores can still
achieve performance close to the peak performance of the processor.
General Purpose Registers
63
0
0
r1
r2
•
•
•
•
r29
Multiply/Divide Registers
63
0
HI (Accumulate HI)
63
0
LO (Accumulate LO)
Program Counter
63
32 310
0
PC
Figure 1 CPU Registers
2 of 25
April 10, 2001
Share Link: 