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reflectometer_fpga_project/designs/adc_dac_synchoronizer/sync_top.sv
2026-05-06 15:37:15 +03:00

136 lines
4.1 KiB
Systemverilog

`timescale 1ns / 1ps
module sync_top
#(
parameter int unsigned DAC_DATA_WIDTH = 14,
parameter int unsigned ADC_DATA_WIDTH = 12,
parameter int unsigned PACK_FACTOR = 1,
parameter int unsigned PROCESS_MODE = 0
)
(
input adc_clk_in,
input adc_rst,
input dac_clk_in,
input dac_rst,
input dac_start,
input [31:0] pulse_width,
input [31:0] pulse_period,
input [DAC_DATA_WIDTH-1:0] pulse_height,
input [15:0] pulse_num,
input [31:0] smp_num,
output logic [ADC_DATA_WIDTH*PACK_FACTOR-1:0] m_axis_tdata,
output logic m_axis_tvalid
);
//------------------------------------------------------------
// Internal signals
//------------------------------------------------------------
(* MARK_DEBUG="true" *) logic sample_req;
(* MARK_DEBUG="true" *) logic sample_req_sync1;
(* MARK_DEBUG="true" *) logic sample_req_sync2;
(* MARK_DEBUG="true" *) logic sample_req_sync3;
(* MARK_DEBUG="true" *) logic sample_done;
(* MARK_DEBUG="true" *) logic sample_done_sync1;
(* MARK_DEBUG="true" *) logic sample_done_sync2;
(* MARK_DEBUG="true" *) logic sample_done_sync3;
(* MARK_DEBUG="true" *) logic pulse;
(* MARK_DEBUG="true" *) logic [DAC_DATA_WIDTH-1:0] pulse_height_out;
//------------------------------------------------------------
// Simple DAC -> ADC test source
//
// generator output is directly connected to sampler input
// with width truncation:
//
// pulse_height_out[13:0] -> data_in[11:0]
//------------------------------------------------------------
(* MARK_DEBUG="true" *) logic [ADC_DATA_WIDTH-1:0] data_in;
(* MARK_DEBUG="true" *) logic out_of_range;
assign data_in = pulse_height_out[ADC_DATA_WIDTH-1:0];
assign out_of_range = 1'b0;
//------------------------------------------------------------
// DAC -> ADC CDC
//------------------------------------------------------------
always_ff @(posedge adc_clk_in or posedge adc_rst) begin
if (adc_rst) begin
sample_req <= 1'b0;
sample_req_sync2 <= 1'b0;
sample_req_sync3 <= 1'b0;
end
else begin
sample_req_sync2 <= sample_req_sync1;
sample_req_sync3 <= sample_req_sync2;
sample_req <= sample_req_sync3;
end
end
//------------------------------------------------------------
// ADC -> DAC CDC
//------------------------------------------------------------
always_ff @(posedge dac_clk_in or posedge dac_rst) begin
if (dac_rst) begin
sample_done <= 1'b0;
sample_done_sync2 <= 1'b0;
sample_done_sync3 <= 1'b0;
end
else begin
sample_done_sync2 <= sample_done_sync1;
sample_done_sync3 <= sample_done_sync2;
sample_done <= sample_done_sync3;
end
end
//------------------------------------------------------------
// Generator
//------------------------------------------------------------
generator #(
.DATA_WIDTH(DAC_DATA_WIDTH)
) generator_inst (
.clk_in(dac_clk_in),
.rst(dac_rst),
.start(dac_start),
.pulse_width(pulse_width),
.pulse_period(pulse_period),
.pulse_height(pulse_height),
.pulse_num(pulse_num),
.sample_done(sample_done),
.pulse(pulse),
.pulse_height_out(pulse_height_out),
.sample_req(sample_req_sync1)
);
//------------------------------------------------------------
// Sampler
//------------------------------------------------------------
sampler #(
.DATA_WIDTH(ADC_DATA_WIDTH),
.PACK_FACTOR(PACK_FACTOR),
.PROCESS_MODE(PROCESS_MODE)
) sampler_inst (
.clk_in(adc_clk_in),
.rst(adc_rst),
.data_in(data_in),
.out_of_range(out_of_range),
.smp_num(smp_num),
.sample_req(sample_req),
.m_axis_tdata(m_axis_tdata),
.m_axis_tvalid(m_axis_tvalid),
.sample_done(sample_done_sync1)
);
endmodule