pluto_hdl_adi/library/common/ad_pnmon.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// Each core or library found in this collection may have its own licensing terms.
// The user should keep this in in mind while exploring these cores.
//
// Redistribution and use in source and binary forms,
// with or without modification of this file, are permitted under the terms of either
// (at the option of the user):
//
// 1. The GNU General Public License version 2 as published by the
// Free Software Foundation, which can be found in the top level directory, or at:
// https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
//
// OR
//
// 2. An ADI specific BSD license as noted in the top level directory, or on-line at:
// https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
//
// ***************************************************************************
// ***************************************************************************
// PN monitors
`timescale 1ns/100ps
module ad_pnmon #(
parameter DATA_WIDTH = 16) (
// adc interface
input adc_clk,
input adc_valid_in,
input [DW:0] adc_data_in,
input [DW:0] adc_data_pn,
// pn out of sync and error
output reg adc_pn_oos,
output reg adc_pn_err);
localparam DW = DATA_WIDTH - 1;
// internal registers
reg adc_valid_d = 'd0;
reg adc_pn_match_d = 'd0;
reg adc_pn_match_z = 'd0;
reg [ 3:0] adc_pn_oos_count = 'd0;
// internal signals
wire adc_pn_match_d_s;
wire adc_pn_match_z_s;
wire adc_pn_match_s;
wire adc_pn_update_s;
wire adc_pn_err_s;
// make sure data is not 0, sequence will fail.
assign adc_pn_match_d_s = (adc_data_in == adc_data_pn) ? 1'b1 : 1'b0;
assign adc_pn_match_z_s = (adc_data_in == 'd0) ? 1'b0 : 1'b1;
assign adc_pn_match_s = adc_pn_match_d & adc_pn_match_z;
assign adc_pn_update_s = ~(adc_pn_oos ^ adc_pn_match_s);
assign adc_pn_err_s = ~(adc_pn_oos | adc_pn_match_s);
// pn oos and counters (16 to clear and set).
always @(posedge adc_clk) begin
adc_valid_d <= adc_valid_in;
adc_pn_match_d <= adc_pn_match_d_s;
adc_pn_match_z <= adc_pn_match_z_s;
if (adc_valid_d == 1'b1) begin
adc_pn_err <= adc_pn_err_s;
if ((adc_pn_update_s == 1'b1) && (adc_pn_oos_count >= 15)) begin
adc_pn_oos <= ~adc_pn_oos;
end
if (adc_pn_update_s == 1'b1) begin
adc_pn_oos_count <= adc_pn_oos_count + 1'b1;
end else begin
adc_pn_oos_count <= 'd0;
end
end
end
endmodule
// ***************************************************************************
// ***************************************************************************