pluto_hdl_adi/library/prcfg/qpsk/prcfg_dac.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2013(c) Analog Devices, Inc.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// - Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
// - Neither the name of Analog Devices, Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
// - The use of this software may or may not infringe the patent rights
// of one or more patent holders. This license does not release you
// from the requirement that you obtain separate licenses from these
// patent holders to use this software.
// - Use of the software either in source or binary form, must be run
// on or directly connected to an Analog Devices Inc. component.
//
// THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED.
//
// IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY
// RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/1ns
module prcfg_dac#(
parameter CHANNEL_ID = 0,
parameter DATA_WIDTH = 16) (
input clk,
// control ports
input [31:0] control,
output reg [31:0] status,
// FIFO interface
output reg src_dac_enable,
input [(DATA_WIDTH-1):0] src_dac_data,
output reg src_dac_valid,
input dst_dac_enable,
output reg [(DATA_WIDTH-1):0] dst_dac_data,
input dst_dac_valid);
localparam SYMBOL_WIDTH = 2;
localparam RP_ID = 8'hA2;
// output register to improve timing
// internal registers
reg [ 7:0] pn_data = 'hF2;
reg [ 3:0] mode = 'h0;
// internal wires
wire [(SYMBOL_WIDTH-1):0] mod_data;
wire [15:0] dac_data_fltr_i;
wire [15:0] dac_data_fltr_q;
// prbs function
function [ 7:0] pn;
input [ 7:0] din;
reg [ 7:0] dout;
begin
dout[7] = din[6];
dout[6] = din[5];
dout[5] = din[4];
dout[4] = din[3];
dout[3] = din[2];
dout[2] = din[1];
dout[1] = din[7] ^ din[4];
dout[0] = din[6] ^ din[3];
pn = dout;
end
endfunction
// update control and status registers
always @(posedge clk) begin
status <= { 24'h0, RP_ID };
mode <= control[ 7:4];
end
// prbs generation
always @(posedge clk) begin
if((dst_dac_en == 1) && (dst_dac_enable == 1)) begin
pn_data <= pn(pn_data);
end
end
// data for the modulator (prbs or dma)
assign mod_data = (mode == 1) ? pn_data[ 1:0] : src_dac_data[ 1:0];
// qpsk modulator
qpsk_mod i_qpsk_mod (
.clk(clk),
.data_input(mod_data),
.data_valid(dst_dac_en),
.data_qpsk_i(dac_data_fltr_i),
.data_qpsk_q(dac_data_fltr_q)
);
// output logic
always @(posedge clk) begin
src_dac_enable <= dst_dac_en;
src_dac_valid <= dst_dac_valid;
case(mode)
4'h0 : begin
dst_dac_data <= src_dac_data;
end
4'h1 : begin
dst_dac_data <= { dac_data_fltr_q, dac_data_fltr_i };
end
4'h2 : begin
dst_dac_data <= { dac_data_fltr_q, dac_data_fltr_i };
end
default : begin
end
endcase
end
endmodule