Features

• Direct replacement for C float software functions such as: +, -, *, /,==, !=,<=, <=, <,>
• C interface supplied for Altera^® Nios^® embedded processors, 8051 compilers
• No programming required
• 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
  • FXAM—examine input data
  • FUCOM—comparison
• Exception built-in routines
• Masks each exception indicator
  • Precision lack: PE
  • Underflow result: UE
  • Overflow result: OE
  • Invalid operand: IE
  • Division by zero: ZE
  • Denormal operand: DE
• Fully synthesizable, static synchronous design with no internal tri-states
• Optimized for use with the Nios II embedded processors

Block Diagram

Figure 1 shows a block diagram of the function.

Figure 1. DFPAU — Floating-Point Arithmetic Unit