Description

PMC-Sierra’s RM7065A is a highly integrated symmetric superscalar microprocessor capable of issuing two instructions each processor cycle. It has two high-performance 64-bit integer units as well as a high-throughput, fully pipelined 64-bit floating point unit.

Features

• Dual issue symmetric superscalar microprocessor with instruction prefetch optimized for system level price/performance

• 300, 350 MHz operating frequency

• >525 Dhrystone 2.1 MIPS @ 350 MHz

• High-performance system interface

• 1000 MB per second peak throughput

• 125 MHz max. freq., multiplexed address/data

• Supports two outstanding reads with out-of-order return

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

• Integrated primary and secondary caches

• All are 4-way set associative with 32 byte line size

• 16 KB instruction, 16 KB data, 256 KB on-chip secondary

• Per line cache locking in primaries and secondary

• Fast Packet Cache™ increases system efficiency in networking applications

• High-performance floating-point unit — 800 MFLOPS maximum

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

• Single cycle repeat rate for single-precision combined multiply-add operations

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

• MIPS IV superset instruction set architecture

• Data PREFETCH instruction allows the processor to overlap cache miss latency and instruction execution

• Single-cycle floating-point multiply-add

• Integrated memory management unit

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

• 64/48 dual entries map 128/96 pages

• Variable page size

• Embedded application enhancements

• Specialized DSP integer Multiply-Accumulate instructions, (MAD/MADU) and three-operand multiply instruction (MUL)

• I&D Test/Break-point (Watch) registers for emulation & debug

• Performance counter for system and software tuning & debug

• Fourteen fully prioritized vectored interrupts — 10 external, 2 internal, 2 software

• Fully static CMOS design with dynamic power down logic