14

OTHER ARITHMETIC OPERATORS

This chapter is devoted to implementations of arithmetic functions reviewed in Chapter 7. As in the preceding chapters, several alternatives will be proposed for the algorithms previously described. As mentioned before, the ever-increasing availability of fast, low-cost memory blocks (ROM, RAM) motivates the development of affordable logical circuits as alternatives to micro-programmed implementations. On the other hand, reconfigurable devices such as the FPGA offer another approach for low-cost circuits implementing special functions normally not efficient within general-purpose arithmetic units. This chapter presents combinational and sequential circuits, FPGA implementation, and VHDL models for most of the algorithms developed in Chapter 7.