DDS

Block: DDS (dds)

Block Author: Aaron Parsons

Document Author: Ben Blackman

Contents Summary Mask Parameters Ports Description Usage

Summary

Generates sines and cosines of different phases and outputs them in parallel.

Mask Parameters

Parameter	Variable	Description
Frequency Divisions (M)	freq_div	Denominator of the frequency.
Frequency (? /M * $2$ * pi)	freq	Numerator of the frequency.
Parallel LOs	num_lo	Number of parallel local oscillators.
Bit Width	n_bits	Bit width of the outputs.
Latency	latency	Description

Ports

Port	Dir	Data Type	Description
sinX	OUT	Fix_(n_bits)_(n_bits-1)	Sine output corresponding to the Xth local oscillator.
cosX	OUT	Fix_(n_bits)_(n_bits-1)	Cosine output corresponding to the Xth local oscillator.

Description

Usage

There are sin and cos outputs each equal to the minimum of num_lo and freq_div. If num_lo > = freq_div/freq, then the outputs will be lo_consts. Otherwise each output will oscillate depending on the values of freq_div and freq. If the outputs oscillate, then there will be a latency of latency and otherwise there will be zero latency.