pluto_hdl_adi/library/axi_ad9361/axi_ad9361_rx_pnmon.v

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2014-03-12 00:01:55 +00:00
// ***************************************************************************
// ***************************************************************************
// 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 axi_ad9361_rx_pnmon (
// adc interface
adc_clk,
adc_valid,
adc_data_i,
adc_data_q,
// pn out of sync and error
adc_pn_oos,
adc_pn_err);
// adc interface
input adc_clk;
input adc_valid;
input [11:0] adc_data_i;
input [11:0] adc_data_q;
// pn out of sync and error
output adc_pn_oos;
output adc_pn_err;
// internal registers
reg [15:0] adc_data = 'd0;
reg [15:0] adc_pn_data = 'd0;
reg adc_valid_d = 'd0;
reg adc_iq_match = 'd0;
reg adc_pn_match_d = 'd0;
reg adc_pn_match_z = 'd0;
reg adc_pn_err = 'd0;
reg [ 6:0] adc_pn_oos_count = 'd0;
reg adc_pn_oos = 'd0;
// internal signals
wire [11:0] adc_data_i_s;
wire [11:0] adc_data_q_s;
wire [11:0] adc_data_q_rev_s;
wire [15:0] adc_data_s;
wire adc_iq_match_s;
wire [15:0] adc_pn_data_s;
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;
// prbs function
function [15:0] pnfn;
input [15:0] din;
reg [15:0] dout;
begin
dout = {din[14:0], ~((^din[15:4]) ^ (^din[2:1]))};
pnfn = dout;
end
endfunction
// bit reversal function
function [11:0] brfn;
input [11:0] din;
reg [11:0] dout;
begin
dout[11] = din[ 0];
dout[10] = din[ 1];
dout[ 9] = din[ 2];
dout[ 8] = din[ 3];
dout[ 7] = din[ 4];
dout[ 6] = din[ 5];
dout[ 5] = din[ 6];
dout[ 4] = din[ 7];
dout[ 3] = din[ 8];
dout[ 2] = din[ 9];
dout[ 1] = din[10];
dout[ 0] = din[11];
brfn = dout;
end
endfunction
// assuming lower nibble is lost-
assign adc_data_i_s = ~adc_data_i;
assign adc_data_q_s = ~adc_data_q;
assign adc_data_q_rev_s = brfn(adc_data_q_s);
assign adc_data_s = {adc_data_i_s, adc_data_q_rev_s[3:0]};
assign adc_iq_match_s = (adc_data_i_s[7:0] == adc_data_q_rev_s[11:4]) ? 1'b1 : 1'b0;
// pn sequence checking algorithm is commonly used in most applications.
// if oos is asserted (pn is out of sync):
// next sequence is generated from the incoming data.
// if 64 sequences match consecutively, oos is cleared (de-asserted).
// if oos is de-asserted (pn is in sync)
// next sequence is generated from the current sequence.
// if 64 sequences mismatch consecutively, oos is set (asserted).
// if oos is de-asserted, any spurious mismatches sets the error register.
// ideally, processor should make sure both oos == 0x0 and err == 0x0.
assign adc_pn_data_s = (adc_pn_oos == 1'b1) ? adc_data_s : adc_pn_data;
assign adc_pn_match_d_s = (adc_data_s == adc_pn_data) ? 1'b1 : 1'b0;
assign adc_pn_match_z_s = (adc_data_s == adc_data) ? 1'b0 : 1'b1;
assign adc_pn_match_s = adc_iq_match & 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 (64 to clear and set).
always @(posedge adc_clk) begin
if (adc_valid == 1'b1) begin
adc_data <= adc_data_s;
adc_pn_data <= pnfn(adc_pn_data_s);
end
adc_valid_d <= adc_valid;
adc_iq_match <= adc_iq_match_s;
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) begin
if (adc_pn_oos_count >= 16) begin
adc_pn_oos_count <= 'd0;
adc_pn_oos <= ~adc_pn_oos;
end else begin
adc_pn_oos_count <= adc_pn_oos_count + 1'b1;
adc_pn_oos <= adc_pn_oos;
end
end else begin
adc_pn_oos_count <= 'd0;
adc_pn_oos <= adc_pn_oos;
end
end
end
endmodule
// ***************************************************************************
// ***************************************************************************