ACT5271

`Full militarized QED RM5271 microprocessor
`Dual Issue superscalar microprocessor - can issue one integer and one floating-point instruction per cycle
- 150, 200, 250 MHz operating frequencies Consult Factory for latest speeds
- 345 Dhrystone2.1 MIPS maximum
- SPECInt95 7.3, SPECfp95 8.3 maximum
` High performance system interface compatible with RM7000,RM5270, RM5260, RM5261, R4600, R4700 and R5000 l Up to 125MHz memory bus operation for a 1000MBps bandwidth from CPU to L2 cache and main memory
- 64-bitmultiplexed system address/data bus for optimum price/performance with high performance write protocols to maximize uncached write bandwidth
- Supports 1/2 clock divisors (2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9)
- IEEE 1149.1 JTAG boundary scan
` Integrated on-chip caches
- 32KB/32KB instruction/data -both 2 way set associative
- Virtually indexed, physically tagged
- Write-back and write-through on per page basis
- Pipeline restart on first double for data cache misses
`Integrated secondary cache controller (R5000 compatible)
- Supports 512K or 2MByte block write-through secondary
` Integrated memory management unit
- Fully associative joint TLB (shared by I and D translations)
- 48 dual entries map 96 pages
- Variable page size (4KB to 16MB in 4x increments)
` High-performance floating point unit - up to 532 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 multiplyadd 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 instruction and 3 operand multiply instruction
- I and D cache locking by set
- Optional dedicated exception vector for interrupts
` Fully static CMOS design with power down logic
- Standby reduced power mode with WAIT instruction
- 4.2 Watts typical power @ 200MHz
- 2.5V core with 3.3V IO's
` 208-lead CQFP, cavity-up package (F17)
` 208-lead CQFP, inverted footprint (F24), Intended to duplicate the commercial QED footprint
` 179-pin PGA package (Future Product) (P10)

The Aeroflex ACT5271 is a highly integrated superscalar microprocessor that implements a superset of the MIPS IV Instruction Set Architecture(ISA). It has a high performance 64-bit integer unit, a high throughput, fully pipelined 64-bit floating point unit, an operating system friendly memory management unit with a 48-entry fully associative TLB, a 32 KByte 2-way set associative instruction cache, a 32 KByte 2-way set associative data cache, and a high-performance 64-bit system interface with support for an optional external secondary cache. The ACT5271 can issue both an integer and a floating point instruction in the same cycle.

The ACT5271 is ideally suited for high-end embedded control applications such as internetworking, high performance image manipulation, high speed printing, and 3-D visualization.The ACT5271 is also applicable to the low end workstation market where its balanced integer and floating-point performance and direct support for a large secondary cache (up to 2MB) provide outstanding price/performance addition to this standard pipeline, the ACT5271 uses an extended seven stage pipeline for floating-point operations. Like the ACT5270 and R5000, the ACT5271 does virtual to physical translation in parallel with cache access.