DESCRIPTION
The IDT79R4640 is a low-cost member of the Integrated Device Technology, Inc. ORION family, targeted to a variety of performance-hungry embedded applications. The R4640 continues the ORION 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.

FEATURES
• High-performance embedded 64-bit microprocessor
   - 64-bit integer operations
   - 64-bit registers
   - Based on the MIPS RISC Architecture
   - 80MHz, 100MHz, 133 MHz and 150MHz operation frequency
   - 32-bit bus interface brings 64-bit power to 32-bit system cost
• High-performance DSP capability
   - 75 Million Integer Mul-Accumulate operations/sec @150MHz
   - 50 MFlops floating-point operations @150MHz
• High-performance microprocessor
   - 75 M Mul-Add/second @150MHz
   - 50 MFlops @150MHz
   - >340,000 dhrystone (2.1)/sec capability @133MHz (197 dhrystone MIPS)
• High level of integration
   - 64-bit, 150 MHz integer CPU
   - 50MFlops single-precision floating-point unit
   - 8KB instruction cache; 8KB data cache
   - Integer multiply unit with 75M 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 1800MB/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 ORION family
   - System interfaces to 67 MHz, provides bandwidth up to 266 MB/sec
   - Direct interface to 32-bit wide systems
   - Synchronized to external reference clock for multimaster operation
• Improved real-time support
   - Fast interrupt decode
   - Optional cache locking