IDT79R465080MS View Datasheet(PDF) - Integrated Device Technology
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IDT79R465080MS Datasheet PDF : 22 Pages
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IDT79R4650
DESCRIPTION
The IDT79R4650 is a low-cost member of the IDT ORION
family, targeted to a variety of performance hungry
embedded applications. The R4650 continues the ORION
tradition of high-performance through high-speed pipelines,
high-bandwidth caches and bus interface, 64-bit archi-
tecture, and careful attention to efficient control. The R4650
reduces the cost of this performance relative to the R4600,
by removing functional units that are frequently unneeded
for many embedded applications, such as double-precision
floating point arithmetic and a TLB.
The R4650 adds features relative to the R4600, 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 R4650 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 RISController
family, and bus- and upwardly software-compatible with the
IDT ORION family, the R4650 will serve in many of the same
applications, but, in addition supports other applications
such as those requiring integer DSP functions.
The R4650 brings ORION performance levels to lower
cost systems. ORION 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 over 2GB/sec aggregate internal bandwidth, 533
MB/sec bus bandwidth, 175 Dhrystone MIPS, 44MFlops,
and 66.7 M Multiply-add/second.
The R4650 provides complete upward application-
software compatibility with the IDT79R3000™ and
IDT79R4700™ families of microprocessors.An array of
COMMERCIAL TEMPERATURE RANGE
development tools facilitates the rapid development of
R4650-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 R4650 enables a
wide variety of capabilities previously limited by the lower
bandwidth and bit-manipulation rates inherent in 32-bit
architectures. For example, the R4650 can perform loads
and stores from cached memory at the rates 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 R4650 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 R4650 CPU. A more detailed description
of the processor is available in the IDT79R4650 Processor
Hardware User’s Manual, available from IDT. Further infor-
mation on development support, applications notes, and
complementary products are also available from your local
IDT sales representative.
HARDWARE OVERVIEW
The R4650 family brings a high-level of integration
designed for high-performance computing. The key
elements of the R4650 are briefly described below. A more
detailed description of each of these subsystems is
available in the User’s Manual.
Pipeline
The R4650 uses a 5-stage pipeline similar to the
IDT79R3000 and the IDT79R4600. The simplicity of this
pipeline allows the R4650 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
General Purpose Registers
63
0
Multiply/Divide Registers
0
63
0
r1
HI (Accumulate HI)
r2
63
0
•
LO (Accumulate LO)
•
•
Program Counter
•
63
31
0
r29
PC
Figure 1: CPU Registers
5.8
2
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