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Floating Point Arithmetic Coprocessor

ver 2.05

OVERVIEW

DFPAU is a Floating Point Arithmetic Co-

processor, designed to assist CPU in per-

forming the floating point arithmetic computa-

tions. DFPAU directly replaces C software

functions, by equivalent, very fast hardware

operations, which significantly accelerate

system performance. It doesn’t require any

programming, so it also doesn’t require any

modifications made in the main software.

Everything is done automatically during soft-

ware compilation by the DFPAU C driver.

DFPAU 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 DFPAU package

DFPAU uses the specialized algorithms to

compute arithmetic functions. It supports ad-

dition, subtraction, multiplication, division,

square root, comparison, absolute value, and

change sign of a number. The input numbers

format is according to IEEE-754 standard

single precision real numbers. DFPAU is pre-

pared to use with 8-, 16- and 32-bit proces-

sors. Trigonometric functions are supported

indirectly, because they are computed as set

of add, multiply and divide operations by

software subroutines. Each floating point

function can be turned on/off

at configura-

tion level providing the flexible scalability of

DFPAU module. It allows save silicon space

and provides exact configuration required by

certain application.

DFPAU 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: +, -, *, /,==, !=,>=, <=, <,

>

C interface supplied for all popular compil-

ers: GNU C/C++, 8051 compilers

No programming required

Configurability of all available functions

IEEE-754 Single precision real format

support – float type

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