Features: `High-performance embedded 64-bit microprocessor
64-bit integer operations
64-bit registers
Based on the MIPS RISC Architecture
100MHz, 133MHz, 150MHz, 180MHz, 200MHz and 267MHz operating frequencies
32-bit bus interface brings 64-bit power to 32-bit system cost
` High-performance DSP capability
133.5 Million Integer Mul-Accumulate operations/sec @267MHz
89 MFlops floating-point operations @267MHz
` High-performance microprocessor
133.5 M Mul-Add/second @267MHz
89 MFlops @267MHz
>640,000 dhrystone (2.1)/sec capability @267MHz (352 dhrystone MIPS)
`High level of integration
64-bit, 267 MHz integer CPU
8KB instruction cache; 8KB data cache
Integer multiply unit with 133.5M Mul-Add/sec
`Upwardly software compatible with IDT RISController Family
` Easily upgradable to 64-bit system
`Low-power operation
Active power management powers-down inactive units
Standby mode
`Large, efficient on-chip caches
Separate 8KB Instruction and 8KB Data caches
Over 3200MB/sec bandwidth from internal caches
2-set associative
Write-back and write-through support
Cache locking, to facilitate deterministic response
High performance write protocols, for graphics and data communications
`Bus compatible with RC4000 family
System interfaces to 125MHz, provides bandwidth up to 500 MB/sec
Direct interface to 32-bit wide systems
Synchronized to external reference clock for multi- master operation
Socket compatible with IDT RC 64474 and RC64574
` Improved real-time support
Fast interrupt decode
Optional cache locking
Note: "R" refers to 5V parts; "RV" refers to 3.3V parts; "RC" refers to bothSpecifications
| Symbol |
Rating |
R4640
5.0V±5% |
RV4640
3.3V±5% |
RV4640
3.3V±5% |
Unit |
| Commercial |
Commercial |
Industrial |
| VTERM |
Terminal Voltage with respect to GND |
0.51 to +7.0 |
0.51 to +4.6 |
0.51 to +4.6 |
V |
| TC |
Operating Temperature(case) |
0 to +85 |
0 to +85 |
-40 to +85 |
|
| TBIAS |
Case Temperature Under Bias |
55 to +125 |
55 to +125 |
55 to +125 |
|
| TSTG |
Storage Temperature |
55 to +125 |
55 to +125 |
55 to +125 |
|
| IIN |
DC Input Current |
202 |
202 |
202 |
mA |
| IOUT |
DC Output Current |
503 |
503 |
503 |
mA |
DescriptionThe IDT79RC4640 is a low-cost member of the Integrated Device Technology, Inc. RC4000 family, targeted to a variety of performancehungry embedded applications. The RC4640 continues the RC4000 tradition of high-performance through high-speed pipelines, high-bandwidth caches and bus interface, 64-bit architecture, and careful attention to efficient control. The cost of this performance is reduced by removing functional units frequently not required for many embedded applications.
The RC4640 supports a wide variety of embedded processor-based applications, such as internetworking equipment (routers, switches),office automation equipment (printers, scanners), and consumer multimedia game systems. Also, being upwardly software-compatible with the RC32300 family as well as bus- and upwardly software-compatible with the IDT RC4000 family, the RC4640 will serve in many of the same applications. And, the RC4640 supports applications that require integer digital signal processing (DSP) functions.
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 RC4640 brings 64-bit performance levels to lower cost systems. High performance is preserved by retaining large on-chip two-way setassociative caches, a streamlined high-speed pipeline, high bandwidth, 64-bit execution, and facilities such as early restart for data cache misses.
These techniques allow the system designer over 3.2 GB/sec aggregate internal bandwidth, 500 MB/sec bus bandwidth, almost 352 Dhrystone MIPS, 89MFlops, and 133.5 M Mul-Add/sec. An array of tools facilitates rapid development of RC4640-based systems, allowing awide variety of customers access to the processor's high-performance capabilities while maintaining short time-to-market goals.
The extensions result in better code density, greater multiprocessing support, improved performance for commonly used code sequences in operating system kernels, and faster execution of floatingpoint intensive applications. All resource dependencies are made transparentto the programmer, insuring transportability among implementations of the MIPS instruction set architecture. In addition, MIPS-III specifies new instructions defined to take advantage of the 64-bit architecture of the processor.
Finally, the RC4640 also implements additional instructions, which are considered extensions to the MIPS-III architecture. These instructions improve the multiply and multiply-add throughput of the CPU, making it well suited to a wide variety of imaging and DSP applications.These extensions, which use opcodes allocated by MIPS Technologies for this purpose, are supported by a wide variety of development tools.
The MIPS integer unit implements a load/store architecture with single cycle ALU operations (logical, shift, add, sub) and autonomous multiply/divide unit. The 64-bit register resources include: 32 generalpurpose orthogonal integer registers, the HI/LO result registers for the integer multiply/divide unit, and the program counter. In addition, the onchip floating-point co-processor adds 32 floating-point registers, and a floating-point control/status register.
IDT79RC4640 Data Sheet
