The NCO: a phase accumulator and a sine table

Set a clock, an accumulator width and a frequency. The spec picks the tuning word; watch the phase step around the wheel and the table turn it into a sine.

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Where the numbers come from

gHashTag/t27 specs/fpga/dsp/signals.t27 (t27#8985): every value on the page is its fn bodies, compiled to wasm (logic.js)
Analog Devices MT-085, Fundamentals of Direct Digital Synthesis: f_out = M f_clk / 2^N, phase truncation spurs
Analog Devices, A Technical Tutorial on Digital Signal Synthesis, 1999

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