The design and implementation of CalmlRISC32 floating point unit

Abstract

The CalmRISC32 FPU is RISC style coprocessor for embedded systems. It supports IEEE-754 standard single precision addition/subtraction, floating-point multiplication, floating-point division, format conversion, comparison, rounding, and load/store. It also supports four rounding modes, and precise exception. It can execute and complete instructions out of order if some constraint is resolved-data dependency, resource conflict, and exception prediction. Standard cell base design technique is used to save design time and cost. First prototype is running at about 70 Mhz with worst-case delay in gate level simulation.