DESCRIPTION:

The ACT5260 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 16 KByte 2-way set associative instruction cache, a 16 KByte 2-way set associative data cache, and a high-performance 64-bit system interface. The ACT5260 can issue both an integer and a floating point instruction in the same cycle.

Features

■ Full militarized QED RM5260 microprocessor

■ Dual Issue superscalar QED RISCMarkä - can issue one integer and one floating-point instruction per cycle microprocessor - can issue one integer and one floating-point instruction per cycle

● 100, 133 and 150MHz frequency (200MHz future option) Consult Factory for latest speeds

● 260 Dhrystone2.1 MIPS

● SPECInt95 4.8. SPECfp95 5.1

■ High performance system interface compatible with R4600, R4700 and R5000

● 64-bit multiplexed system address/data bus for optimum price/performance up to 100 MHz operating frequency

● High performance write protocols maximize uncached write bandwidth

● Operates at input system clock multipliers of 2 through 8

● 5V tolerant I/Os

● IEEE 1149.1 JTAG boundary scan

■ Integrated on-chip caches - up to 3.2GBps internal data rate

● 16KB instruction - 2 way set associative

● 16KB data - 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 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)

■ Embedded supply de-coupling capacitors and Pll filter components

■ High-performance floating point unit - up to 400 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 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

● 5 Watts typical at 3.3V, less than 175 mwatts in Standby

■ 208-lead CQFP, cavity-up package (F17)

■ 208-lead CQFP, inverted footprint (F24), Intended to duplicate the commercial QED footprint (Consult Factory)

■ 179-pin PGA package (Future Product) (P10)