VHDL and verilog implementation of dds and fft
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The core component of a DDS waveform generator is the accumulator. The accumulator is a running counter which stores the current phase value of the generated waveform. The rate at which the accumulator is updated and the accumulator increment value determine the frequency of the generated waveform. For example if the accumulator is updated 360 times per second and the accumulator increment is one degree, then the generated frequency is 1 Hz (360 degrees per second). When the accumulator phase value reaches the maximum (360 degrees) it rolls over and starts again at 0 degrees. In order to represent the phase value more accurately the accumulator commonly uses 32-, 48-, or 64-bit for the counter. In a 32-bit accumulator the phase value has a range from 0 to 4294967295 which represents one full cycle of the reference w