NXP MC68882EI25A

Сопроцессор с плавающей точкой68-LCC (J-Lead)

Overview

The MC68882 floating-point coprocessor fully implements the IEEE Standard for Binary Floating Point Arithmetic (ANSI-IEEE Standard 754-1985) for use with the Motorola M68000 Family of micro-processors. An upgrade of the MC68881, it is pin and software compatible with an optimized MPU interface providing in excess of 1.5 times the performance of the MC68881. It is implemented using VLSI technology to give systems designers the highest possible functionality in a physically small device.

· A 67-bit arithmetic unit to allow very fast calculations, with intermediate precision greater than the extended          precision format. · A 67-bit barrel shifter for high-speed shifting operations (for normalizing etc.). · Special purpose hardware for high-speed conversion of binary real memory operands to and from the internal        extended format. · Reduced coprocessor interface overhead to increase throughput. · Forty-six instructions, including 35 arithmetic operations. · Full conformation to the ANSHEEE 754 standard, including all requirements and suggestions. · Support of functions not defined by the IEEE standard, including a full set of trigonometric and transcendental        functions. · Seven data types: byte, word and long word integers; single, double, and extended precision real numbersand        packed binary coded decimal string real numbers. · Twenty-two constants available in the on-chip ROM, including m,e, and powers of 10. · Virtual memory/machine operations. · Efficient mechanisms for procedure calls, context switches, and interupt handling. · Concurrent instruction execution with the main processor. · Concurrent instruction execution of multiple floating-point instructions. · Use with any host processor, on an 8-,16-, or 32-bit data bus.

Features

Applications

• Secure Download and Boot
• Ecosystem Control
• Anti-cloning
• Message Security
• µP Switch Interfacing
• Industrial Instruments
• PC-Based Instruments
• Portable Instruments
• Membrane Keypads
• Authentication of Medical Sensors and Tools