NCO IP Core: User Guide

ID 683406
Date 11/06/2017
Document Table of Contents

3.1.1. Large ROM Architecture

Use the large ROM architecture if your design requires very high speed sinusoidal waveforms and your design can use large quantities of internal memory.

In this architecture, the ROM stores the full 360 degrees of both the sine and cosine waveforms. The output of the phase accumulator addresses the ROM.

The internal memory holds all possible output values for a given angular and magnitude precision. The generated waveform has the highest spectral purity for that parameter set (assuming no dithering). The large ROM architecture also uses the fewest logic elements (LEs) for a given set of precision parameters.