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 architecture, 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.

FEATURES
• High-performance embedded 64-bit microprocessor
   - 64-bit integer operations
   - 64-bit registers
   - 80MHz, 100MHz, 133MHz operation frequency
• High-performance DSP capability
   - 66.7 Million Integer Multiply-Accumulate Operations/ sec @ 133 MHz
   - 44 MFlops floating point operations @133MHz
• High-performance microprocessor
   - 133 MIPS at 133MHz
   - 66.7 M Mul-Add/second at 133MHz
   - 44 MFLOP/s at 133MHz
   - >300,000 dhrystone (2.1)/sec capability at 133MHz (175 dhrystone MIPS)
• High level of integration
   - 64-bit, 133 MIPS integer CPU
   - 44MFlops Single precision floating-point unit
   - 8KB instruction cache; 8KB data cache
   - Integer multiply unit with 66.7M Mul-Add/sec
• Low-power operation
   - Active power management powers-down inactive units
   - Standby mode
• Upward software compatible with IDT RISController Family
• Large, efficient on-chip caches
   - Separate 8kB Instruction and 8kB Data caches
   - Over 1500MB/sec bandwidth from internal caches
   - 2-set associative
   - Write-back and write-through support
   - Cache locking to facilitate deterministic response
• Bus compatible with ORION family
   - System interfaces to 67 MHz, provides bandwidth up to 533 MB/S
   - Direct interface to 32-bit wide or 64-bit wide systems
   - Synchronized to external reference clock for multi-master operation
• Improved real-time support
   - Fast interrupt decode
   - Optional cache locking