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Copyright 1999-2007 DCD – Digital Core Design. All Rights Reserved.

http://www.DigitalCoreDesign.com

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Floating Point Coprocessor

ver 2.05

OVERVIEW

DFPMU is a Floating Point Coprocessor, de-

signed to assist CPU in performing the float-

ing point mathematic computations. DFPMU

directly replaces C software functions, by

equivalent, very fast hardware operations,

which significantly accelerate system per-

formance. It doesn’t require any program-

ming, so it also doesn’t require any modifica-

tions made in the main software. Everything

is done automatically during software compi-

lation by the DFPMU C driver.

DFPMU was designed to operate with DCD’s

DP8051, but can also operate with any other

8-, 16- and 32-bit processor. Drivers for all

popular 8051 C compilers are delivered to-

gether with the DFPMU package.

DFPMU uses the specialized CORDIC and

standard algorithms to compute math func-

tions. It supports addition, subtraction, mul-

tiplication, division, square root

, compari-

son, absolute value, change sign of a number

and trigonometric functions: sine, cosine,

tangent

and arctangent. It has built-in con-

version instructions from integer type to float-

ing point type and vice versa. The input num-

bers format is according to IEEE-754 stan-

dard. DFPMU supports single precision real

numbers, 16-bit and 32-bit integers. Each

floating point function can be turned

on/off

at configuration level providing the

flexible scalability of DFPMU module. It al-

lows save silicon space and provides exact

configuration required by certain application.

DFPMU is a technology independent design

that can be implemented in a variety of proc-

ess technologies.

APPLI C ATIONS

Math coprocessors

DSP algorithms

Embedded arithmetic coprocessor

Fast data processing & control

KEY FEATURES

Direct replacement

for C float software

functions such as: +, -, *, /,==, !=,>=, <=, <,

>

Configurability of all available functions

C interface supplied for all popular compil-

ers: GNU C/C++, 8051 compilers

No programming required

IEEE-754 Single precision real format

support – float type

16-bit word and 32-bit short integers for-

mat supported – integer types

Flexible arguments and result registers

location

Performs the following functions:

FADD, FSUB

– addition, subtraction

FMUL, FDIV

– multiplication, division

FSQRT

– square root

FCHS, FABS

– change of sign, absolute

value