DFPAU
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.
All trademarks mentioned in this document
are trademarks of their respective owners.
DFPAU is a technology independent design
that can be implemented in a variety of proc-
ess technologies.
APPLICATIONS
●
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
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