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Hardware Overview

The RM5261A offers a high-level of integration targeted at high-performance embedded applications. The key elements of the RM5261A are briefly described below.

Features

? Dual Issue superscalar microprocessor

? 250, 300, and 350 MHz operating frequencies

? Up to 420 Dhrystone 2.1 MIPS

? High-performance system interface

? 64-bit multiplexed system address/data bus for optimum price/performance

? High-performance write protocols maximize uncached write bandwidth

? Processor clock multipliers 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9

? IEEE 1149.1 JTAG boundary scan

? Integrated on-chip caches

? 32 KB instruction and 32 KB data — 2 way set associative

? Per set locking

? Virtually indexed, physically tagged

? Write-back and write-through on a per page basis

? Pipeline restart on first doubleword for data cache misses

? Integrated memory management unit

? Fully associative joint TLB (shared by I and D translations)

? 48 dual entries map 96 pages

? Variable page size (4 KB to 16 MB in 4x increments)

? High-performance floating-point unit: up to 700 MFLOPS

? Single cycle repeat rate for common single-precision operations and some double-precision operations

? Two cycle repeat rate for double-precision multiply and double precision combined multiply-add operations

? Single cycle repeat rate for single-precision combined multiply-add operation

? MIPS IV instruction set

? Floating point multiply-add instruction increases performance in signal processing and graphics applications

? Conditional moves to reduce branch frequency

? Index address modes (register + register)

? Embedded application enhancements

? Specialized DSP integer Multiply-Accumulate instructions and 3-operand multiply instruction

? I and D cache locking by set

? Optional dedicated exception vector for interrupts

? Fully static 0.18 micron CMOS design with power down logic

? Standby reduced power mode with WAIT instruction

? 1.65 V or 1.8 V core with 3.3 V or 2.5 V I/O

? 208-pin QFP package