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This chapter has introduced the concept of fixed point arithmetic in VHDL and provided a basic package of functions and types to get started using VHDL. It must be stressed that this package is purely for exemplar designs and the reader is encouraged to either use commercially available libraries for optimum performance or to develop their own libraries. The usage of fixed point functions in Verilog is also briefly introduced.
Floating point functionality has also been introduced; however, the overhead in the FPGA is such that unless double precision is applied, the accuracy will be limited due to rounding errors, and therefore fixed point is still usually quite acceptable for most practical applications. In practice, as the size of FPGAs has increased to the extent that a microprocessor core can be quite easily implemented on the FPGA, in most cases it is simply a case of writing the floating point code in C and running a processor core directly on the FPGA with the high-level code on the core.
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Manufacturer:Xilinx
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