pluto_hdl_adi/library/common/ad_pnmon.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// In this HDL repository, there are many different and unique modules, consisting
// of various HDL (Verilog or VHDL) components. The individual modules are
// developed independently, and may be accompanied by separate and unique license
// terms.
//
// The user should read each of these license terms, and understand the
2018-03-14 14:45:47 +00:00
// freedoms and responsibilities that he or she has by using this source/core.
//
// This core is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE.
//
// Redistribution and use of source or resulting binaries, with or without modification
// of this file, are permitted under one of the following two license terms:
//
// 1. The GNU General Public License version 2 as published by the
// Free Software Foundation, which can be found in the top level directory
// of this repository (LICENSE_GPL2), and also online at:
// <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
//
// OR
//
// 2. An ADI specific BSD license, which can be found in the top level directory
// of this repository (LICENSE_ADIBSD), and also on-line at:
// https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD
// This will allow to generate bit files and not release the source code,
// as long as it attaches to an ADI device.
//
// ***************************************************************************
// ***************************************************************************
// PN monitors
`timescale 1ns/100ps
module ad_pnmon #(
parameter DATA_WIDTH = 16,
parameter OOS_THRESHOLD = 16,
parameter ALLOW_ZERO_MASKING = 0) (
// adc interface
input adc_clk,
input adc_valid_in,
input [(DATA_WIDTH-1):0] adc_data_in,
input [(DATA_WIDTH-1):0] adc_data_pn,
input adc_pattern_has_zero,
// pn out of sync and error
output adc_pn_oos,
output adc_pn_err
);
localparam CNT_W = $clog2(OOS_THRESHOLD);
// internal registers
reg adc_valid_d = 'd0;
reg adc_pn_match_d = 'd0;
reg adc_pn_match_z = 'd0;
reg adc_pn_oos_int = 'd0;
reg adc_pn_err_int = 'd0;
reg [CNT_W-1:0] adc_pn_oos_count = 'd0;
reg adc_valid_zero_d = 'b0;
// 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;
wire adc_valid_zero;
// 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'b1 : 1'b0;
assign adc_pn_match_s = adc_pn_match_d & ~adc_pn_match_z;
assign adc_pn_update_s = ~(adc_pn_oos_int ^ adc_pn_match_s);
// Ignore sporadic zeros in middle of pattern if not out of sync
// but OOS_THRESHOLD consecutive zeros would assert out of sync.
assign adc_valid_zero = ALLOW_ZERO_MASKING & adc_pattern_has_zero &
~adc_pn_oos_int & adc_pn_match_z_s;
assign adc_pn_err_s = ~(adc_pn_oos_int | adc_pn_match_s | adc_valid_zero_d);
// pn oos and counters (16 to clear and set).
assign adc_pn_oos = adc_pn_oos_int;
assign adc_pn_err = adc_pn_err_int;
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;
adc_valid_zero_d <= adc_valid_zero;
if (adc_valid_d == 1'b1) begin
adc_pn_err_int <= adc_pn_err_s;
if ((adc_pn_update_s == 1'b1) && (adc_pn_oos_count >= OOS_THRESHOLD-1)) begin
adc_pn_oos_int <= ~adc_pn_oos_int;
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
// ***************************************************************************
// ***************************************************************************