Datasheet > NS32381-20

NS32381-20

更新时间： 2024-11-12 23:54:27

品牌	Logo	应用领域
其他 - ETC		外围集成电路时钟
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32页	376K
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数据手册

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NS32381-20 数据手册

PRELIMINARY

April 1991

NS32381-15/NS32381-20/NS32381-25/NS32381-30

Floating-Point Unit

General Description

The NS32381 is a second generation, CMOS, floating-point

slave processor that is fully software compatible with its

forerunner, the NS32081 FPU. The NS32381 FPU functions

The FPU is fabricated with National’s advanced double-met-

al CMOS process.

with all Series 32000 and Series 32000/EP CPUs in a

Features

tightly coupled slave configuration. The performance of the

NS32381 has been increased over the NS32081 by archi-

tecture improvements, hardware enhancements, and higher

clock frequencies. Key improvements include the addition of

a 32-bit slave protocol, an early done algorithm to increase

CPU/FPU parallelism, an expanded register set, an auto-

matic power down feature, expanded math hardware, and

additional instructions.

Compatible with all Series 32000 and Series 32000/EP

CPUs

Selectable 16-bit or 32-bit Slave Protocol

Compatible with IEEE Standard 754-1985 for binary

floating point arithmetic

Early done algorithm

Single (32-bit) and double (64-bit) precision operations

Eight on-chip (64-bit) data registers

The NS32381 FPU contains eight 64-bit data registers and

a Floating-Point Status Register (FSR). The FPU executes

20 instructions, and operates on both single and double-

precision operands. Three separate processors in the

NS32381 manipulate the mantissa, sign, and exponent.

Automatic power down mode

Full upward compatibility with existing 32000 software

High speed double-metal CMOS design

68-pin PGA package

The CPU and NS32381 FPU form a tightly coupled comput-

er cluster, which appears to the user as a single processing

unit. The CPU and FPU communication is handled automati-

cally, and is user transparent.

68-pin plastic package

FPU Block Diagram

TL/EE/9157–1

FIGURE 1-1

Series 32000É and TRI-STATEÉ are registered trademarks of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/EE/9157

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...32

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与NS32381-20相关器件

型号	品牌	获取价格	描述	数据表
NS32381-30	TI	获取价格	32-BIT, FLOATING POINT ACCELERATOR, PPGA68, PGA-68
NS32381U-15	ETC	获取价格	Arithmetic Processor
NS32381U-20	ETC	获取价格	Arithmetic Processor
NS32381U-25	ETC	获取价格	Arithmetic Processor
NS32381U-30	ETC	获取价格	Arithmetic Processor
NS32381V-20	TI	获取价格	32-BIT, FLOATING POINT ACCELERATOR, PQCC68, PLASTIC, LCC-68
NS32381V-25	TI	获取价格	32-BIT, FLOATING POINT ACCELERATOR, PQCC68, PLASTIC, LCC-68
NS32381V-30	NSC	获取价格	IC 32-BIT, FLOATING POINT ACCELERATOR, PQCC68, PLASTIC, LCC-68, Math Processor
NS32382-10	NSC	获取价格	MEMORY MANAGEMENT UNITS
NS32382-15	NSC	获取价格	MEMORY MANAGEMENT UNITS