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(
clk,
// control ports
control,
status,
// FIFO interface
src_dac_en,
src_dac_ddata,
src_dac_dunf,
src_dac_dvalid,
dst_dac_en,
dst_dac_ddata,
dst_dac_dunf,
dst_dac_dvalid
);
parameter CHANNEL_ID = 0;
parameter DATA_WIDTH = 32;
parameter SYMBOL_WIDTH = 2;
localparam RP_ID = 8'hA2;
localparam SYMBOL_CNTR_WIDTH = $clog2(DATA_WIDTH/SYMBOL_WIDTH);
localparam NROF_SYMBOLES = DATA_WIDTH/SYMBOL_WIDTH;
input clk;
input [31:0] control;
output [31:0] status;
output src_dac_en;
input [(DATA_WIDTH-1):0] src_dac_ddata;
input src_dac_dunf;
input src_dac_dvalid;
input dst_dac_en;
output [(DATA_WIDTH-1):0] dst_dac_ddata;
output dst_dac_dunf;
output dst_dac_dvalid;
// output register to improve timing
reg dst_dac_dunf = 'h0;
reg [(DATA_WIDTH-1):0] dst_dac_ddata = 'h0;
reg dst_dac_dvalid = 'h0;
reg src_dac_en = 'h0;
// internal registers
reg [ 7:0] pn_data = 'hF2;
reg [31:0] status = 'h0;
reg [ 3:0] mode = 'h0;
reg [(SYMBOL_WIDTH-1):0] dac_data_buf[(NROF_SYMBOLES-1):0];
reg [(SYMBOL_CNTR_WIDTH-1):0] symbole_counter = 'd0;
reg [2:0] sample_counter = 'd0;
// internal wires
wire [(SYMBOL_WIDTH-1):0] mod_data;
wire [15:0] dac_data_fltr_i;
wire [15:0] dac_data_fltr_q;
wire [(DATA_WIDTH-1):0] dac_data_mode0;
wire [(DATA_WIDTH-1):0] dac_data_mode1_2;
wire mod_en;
// 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) begin
pn_data <= pn(pn_data);
end
end
// symbol wrapper, data is transmitted MSB first
genvar i;
generate
for (i = 0; i < NROF_SYMBOLES; i = i + 1) begin : SYMBOLE_WRAPPER
// flop the incoming data when it's valid and all the symbols are pushed out
always @(posedge clk) begin
if((src_dac_dvalid == 1'b1) && (symbole_counter == 'd0)) begin
dac_data_buf[(NROF_SYMBOLES-i-1)] <= src_dac_ddata[((i+1)*SYMBOL_WIDTH)-1:(i*SYMBOL_WIDTH)];
end
end
end
endgenerate
// increment to counter for the symbol mux
always @(posedge clk) begin
if((src_dac_dvalid == 1'b1) && (dst_dac_en == 1'b1)) begin
if(mod_en == 1'b1) begin
symbole_counter <= symbole_counter + 1;
end
sample_counter <= sample_counter + 1;
end
end
// the modulator generate eight samples from each symbol
// to prevent data loss, need to keep each symbol at data_input port for 8 samples
assign mod_en = (sample_counter == 7) ? 1'b1 : 1'b0;
// data for the modulator (prbs or dma)
assign mod_data = (mode == 1) ? pn_data[ 1:0] : dac_data_buf[symbole_counter];
// 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)
);
// pass through mode
assign dac_data_mode0 = src_dac_ddata;
// modulated data
assign dac_data_mode1_2 = { dac_data_fltr_q, dac_data_fltr_i };
// output logic
always @(posedge clk) begin
src_dac_en <= (& symbole_counter) & (& sample_counter);
dst_dac_dunf <= (mode == 1) ? 1'b0 : src_dac_dunf;
dst_dac_ddata <= (mode == 0) ? dac_data_mode0 : dac_data_mode1_2;
dst_dac_dvalid <= (mode == 0) ? src_dac_dvalid : ((dst_dac_en == 1'b1) ? 1'b1 : 1'b0);
end
endmodule