IDT79RC4650™

` High-performance embedded 64-bit microprocessor 64-bit integer operations 64-bit registers 100MHz, 133MHz, 150 MHz, 180MHz, 200MHz and 267MHz operation frequencies
` High-performance DSP capability 133.5 Million Integer Multiply-Accumulate Operations/sec @ 267 MHz
` High-performance microprocessor 133.5 M Mul-Add/second at 267MHz 89 MFL0P/s at 250MHz >640,000 dhrystone (2.1)/sec capability at 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
` Low-power operation Active power management powers-down inactive units Standby mode
` Upwardly software compatible with IDT RISController Family
` 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
` Bus compatible with RC4000 family System interface provides bandwidth up to 1000 MB/S Direct interface to 32-bit wide or 64-bit wide systems Synchronized to external reference clock for multi-master operation Socket compatible with IDT RC64475 and RC64575
` 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 both

Note: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect  eliability.

The IDT79RC4650 is a low-cost member of the IDT Microprocessor family, targeted to a variety of performance-hungry embedded applications. 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 applications, 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 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 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, highbandwidth, 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 bitmanipulation 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, applications notes, and complementary products are also available from your local IDT sales representative.