pluto_hdl_adi/library/common/ad_pnmon.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2011(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.
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// PN monitors
`timescale 1ns/100ps
module ad_pnmon (
// adc interface
adc_clk,
adc_valid_in,
adc_data_in,
adc_data_pn,
// pn out of sync and error
adc_pn_oos,
adc_pn_err);
// parameters
parameter DATA_WIDTH = 16;
localparam DW = DATA_WIDTH - 1;
// 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 adc_pn_oos;
output adc_pn_err;
// internal registers
reg adc_valid_d = 'd0;
reg adc_pn_match_d = 'd0;
reg adc_pn_match_z = 'd0;
reg adc_pn_err = 'd0;
reg adc_pn_oos = '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
// ***************************************************************************
// ***************************************************************************