130 lines
3.9 KiB
Verilog
130 lines
3.9 KiB
Verilog
// ***************************************************************************
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// ***************************************************************************
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// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
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//
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// In this HDL repository, there are many different and unique modules, consisting
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// of various HDL (Verilog or VHDL) components. The individual modules are
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// developed independently, and may be accompanied by separate and unique license
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// terms.
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//
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// The user should read each of these license terms, and understand the
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// freedoms and responsibilities that he or she has by using this source/core.
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//
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// This core is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE.
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//
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// Redistribution and use of source or resulting binaries, with or without modification
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// of this file, are permitted under one of the following two license terms:
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//
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// 1. The GNU General Public License version 2 as published by the
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// Free Software Foundation, which can be found in the top level directory
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// of this repository (LICENSE_GPL2), and also online at:
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// <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
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//
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// OR
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//
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// 2. An ADI specific BSD license, which can be found in the top level directory
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// of this repository (LICENSE_ADIBSD), and also on-line at:
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// https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD
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// This will allow to generate bit files and not release the source code,
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// as long as it attaches to an ADI device.
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//
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// ***************************************************************************
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// ***************************************************************************
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`timescale 1ns/100ps
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module ad_dds_1 #(
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// parameters
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parameter DDS_TYPE = 1,
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parameter CORDIC_DW = 16,
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parameter CORDIC_PHASE_DW = 16) (
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// interface
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input clk,
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input [15:0] angle,
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input [15:0] scale,
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output reg [15:0] dds_data);
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// local parameters
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localparam DDS_CORDIC_TYPE = 1;
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localparam DDS_POLINOMIAL_TYPE = 2;
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// internal signals
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wire [CORDIC_DW-1:0] sine_s;
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wire [ 15:0] sine16_s;
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wire [ 3:0] zeros;
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wire [ 33:0] s1_data_s;
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assign zeros = 0;
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// sine
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generate
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if (DDS_TYPE == DDS_CORDIC_TYPE) begin
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// the cordic module input angle width must be equal with it's width
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wire [CORDIC_PHASE_DW:0] angle_s;
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if (CORDIC_PHASE_DW >= 16) begin
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assign angle_s = {angle,{CORDIC_PHASE_DW-15{1'b0}}};
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end else begin
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assign angle_s = {angle[15:16-CORDIC_PHASE_DW],1'b0};
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end
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if (CORDIC_DW >= 16) begin
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assign sine16_s = sine_s[CORDIC_DW-1:CORDIC_DW-16];
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end else begin
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assign sine16_s = {sine_s,zeros[15-CORDIC_DW:0]};
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end
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ad_dds_sine_cordic #(
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.CORDIC_DW(CORDIC_DW),
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.PHASE_DW(CORDIC_PHASE_DW),
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.DELAY_DW(1))
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i_dds_sine (
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.clk (clk),
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.angle (angle_s[CORDIC_PHASE_DW:1]),
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.sine (sine_s),
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.cosine (),
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.ddata_in (1'b0),
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.ddata_out ());
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end else begin
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assign sine16_s = sine_s;
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ad_dds_sine i_dds_sine (
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.clk (clk),
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.angle (angle),
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.sine (sine_s),
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.ddata_in (1'b0),
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.ddata_out ());
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end
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endgenerate
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// scale for a 16 bit sine generator
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ad_mul #(.DELAY_DATA_WIDTH(1)) i_dds_scale (
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.clk (clk),
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.data_a ({sine16_s[15], sine16_s}),
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.data_b ({scale[15], scale}),
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.data_p (s1_data_s),
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.ddata_in (1'b0),
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.ddata_out ());
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// dds data
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always @(posedge clk) begin
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dds_data <= s1_data_s[29:14];
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end
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endmodule
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// ***************************************************************************
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// ***************************************************************************
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