265 lines
10 KiB
Coq
265 lines
10 KiB
Coq
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// ***************************************************************************
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// ***************************************************************************
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// Copyright 2011(c) Analog Devices, Inc.
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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// - Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// - Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in
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// the documentation and/or other materials provided with the
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// distribution.
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// - Neither the name of Analog Devices, Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// - The use of this software may or may not infringe the patent rights
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// of one or more patent holders. This license does not release you
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// from the requirement that you obtain separate licenses from these
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// patent holders to use this software.
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// - Use of the software either in source or binary form, must be run
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// on or directly connected to an Analog Devices Inc. component.
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//
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// THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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// INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
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// PARTICULAR PURPOSE ARE DISCLAIMED.
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//
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// IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY
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// RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ***************************************************************************
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// ***************************************************************************
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// ***************************************************************************
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// ***************************************************************************
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// PN monitors
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`timescale 1ns/100ps
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module axi_ad9467_pnmon (
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// adc interface
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adc_clk,
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adc_data,
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// pn out of sync and error
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adc_pn_oos,
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adc_pn_err,
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// processor interface PN9 (0x0), PN23 (0x1)
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up_pn_type);
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// adc interface
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input adc_clk;
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input [15:0] adc_data;
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// pn out of sync and error
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output adc_pn_oos;
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output adc_pn_err;
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// processor interface PN9 (0x0), PN23 (0x1)
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input up_pn_type;
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reg adc_pn_type_m1 = 'd0;
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reg adc_pn_type_m2 = 'd0;
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reg adc_pn_type = 'd0;
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reg adc_pn_en = 'd0;
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reg [15:0] adc_data_d = 'd0;
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reg [31:0] adc_pn_data = 'd0;
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reg adc_pn_en_d = 'd0;
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reg adc_pn_match = 'd0;
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reg [ 6:0] adc_pn_oos_count = 'd0;
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reg adc_pn_oos = 'd0;
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reg [ 4:0] adc_pn_err_count = 'd0;
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reg adc_pn_err = 'd0;
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wire [31:0] adc_pn_data_in_s;
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wire adc_pn_match0_s;
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wire adc_pn_match1_s;
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wire adc_pn_match2_s;
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wire adc_pn_match_s;
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wire [31:0] adc_pn_data_s;
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wire adc_pn_err_s;
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// PN23 function
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function [31:0] pn23;
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input [31:0] din;
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reg [31:0] dout;
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begin
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dout[31] = din[22] ^ din[17];
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dout[30] = din[21] ^ din[16];
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dout[29] = din[20] ^ din[15];
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dout[28] = din[19] ^ din[14];
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dout[27] = din[18] ^ din[13];
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dout[26] = din[17] ^ din[12];
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dout[25] = din[16] ^ din[11];
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dout[24] = din[15] ^ din[10];
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dout[23] = din[14] ^ din[ 9];
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dout[22] = din[13] ^ din[ 8];
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dout[21] = din[12] ^ din[ 7];
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dout[20] = din[11] ^ din[ 6];
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dout[19] = din[10] ^ din[ 5];
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dout[18] = din[ 9] ^ din[ 4];
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dout[17] = din[ 8] ^ din[ 3];
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dout[16] = din[ 7] ^ din[ 2];
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dout[15] = din[ 6] ^ din[ 1];
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dout[14] = din[ 5] ^ din[ 0];
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dout[13] = din[ 4] ^ din[22] ^ din[17];
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dout[12] = din[ 3] ^ din[21] ^ din[16];
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dout[11] = din[ 2] ^ din[20] ^ din[15];
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dout[10] = din[ 1] ^ din[19] ^ din[14];
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dout[ 9] = din[ 0] ^ din[18] ^ din[13];
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dout[ 8] = din[22] ^ din[12];
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dout[ 7] = din[21] ^ din[11];
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dout[ 6] = din[20] ^ din[10];
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dout[ 5] = din[19] ^ din[ 9];
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dout[ 4] = din[18] ^ din[ 8];
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dout[ 3] = din[17] ^ din[ 7];
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dout[ 2] = din[16] ^ din[ 6];
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dout[ 1] = din[15] ^ din[ 5];
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dout[ 0] = din[14] ^ din[ 4];
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pn23 = dout;
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end
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endfunction
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// PN9 function
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function [31:0] pn9;
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input [31:0] din;
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reg [31:0] dout;
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begin
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dout[31] = din[ 8] ^ din[ 4];
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dout[30] = din[ 7] ^ din[ 3];
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dout[29] = din[ 6] ^ din[ 2];
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dout[28] = din[ 5] ^ din[ 1];
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dout[27] = din[ 4] ^ din[ 0];
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dout[26] = din[ 3] ^ din[ 8] ^ din[ 4];
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dout[25] = din[ 2] ^ din[ 7] ^ din[ 3];
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dout[24] = din[ 1] ^ din[ 6] ^ din[ 2];
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dout[23] = din[ 0] ^ din[ 5] ^ din[ 1];
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dout[22] = din[ 8] ^ din[ 0];
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dout[21] = din[ 7] ^ din[ 8] ^ din[ 4];
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dout[20] = din[ 6] ^ din[ 7] ^ din[ 3];
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dout[19] = din[ 5] ^ din[ 6] ^ din[ 2];
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dout[18] = din[ 4] ^ din[ 5] ^ din[ 1];
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dout[17] = din[ 3] ^ din[ 4] ^ din[ 0];
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dout[16] = din[ 2] ^ din[ 3] ^ din[ 8] ^ din[ 4];
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dout[15] = din[ 1] ^ din[ 2] ^ din[ 7] ^ din[ 3];
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dout[14] = din[ 0] ^ din[ 1] ^ din[ 6] ^ din[ 2];
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dout[13] = din[ 8] ^ din[ 0] ^ din[ 4] ^ din[ 5] ^ din[ 1];
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dout[12] = din[ 7] ^ din[ 8] ^ din[ 3] ^ din[ 0];
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dout[11] = din[ 6] ^ din[ 7] ^ din[ 2] ^ din[ 8] ^ din[ 4];
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dout[10] = din[ 5] ^ din[ 6] ^ din[ 1] ^ din[ 7] ^ din[ 3];
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dout[ 9] = din[ 4] ^ din[ 5] ^ din[ 0] ^ din[ 6] ^ din[ 2];
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dout[ 8] = din[ 3] ^ din[ 8] ^ din[ 5] ^ din[ 1];
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dout[ 7] = din[ 2] ^ din[ 4] ^ din[ 7] ^ din[ 0];
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dout[ 6] = din[ 1] ^ din[ 3] ^ din[ 6] ^ din[ 8] ^ din[ 4];
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dout[ 5] = din[ 0] ^ din[ 2] ^ din[ 5] ^ din[ 7] ^ din[ 3];
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dout[ 4] = din[ 8] ^ din[ 1] ^ din[ 6] ^ din[ 2];
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dout[ 3] = din[ 7] ^ din[ 0] ^ din[ 5] ^ din[ 1];
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dout[ 2] = din[ 6] ^ din[ 8] ^ din[ 0];
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dout[ 1] = din[5] ^ din[7] ^ din[8] ^ din[4];
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dout[ 0] = din[4] ^ din[6] ^ din[7] ^ din[3];
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pn9 = dout;
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end
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endfunction
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// This PN sequence checking algorithm is commonly used is most applications.
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// It is a simple function generated based on the OOS status.
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// If OOS is asserted (PN is OUT of sync):
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// The next sequence is generated from the incoming data.
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// If 16 sequences match CONSECUTIVELY, OOS is cleared (de-asserted).
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// If OOS is de-asserted (PN is IN sync)
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// The next sequence is generated from the current sequence.
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// If 64 sequences mismatch CONSECUTIVELY, OOS is set (asserted).
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// If OOS is de-asserted, any spurious mismatches sets the ERROR register.
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// Ideally, processor should make sure both OOS == 0x0 AND ERR == 0x0.
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assign adc_pn_data_in_s[31:16] = {~adc_data_d[15], adc_data_d[14:0]};
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assign adc_pn_data_in_s[15:0] = {~adc_data[15], adc_data[14:0]};
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assign adc_pn_match0_s = (adc_pn_data_in_s[31:16] == adc_pn_data[31:16]) ? 1'b1 : 1'b0;
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assign adc_pn_match1_s = (adc_pn_data_in_s[15:0] == adc_pn_data[15:0]) ? 1'b1 : 1'b0;
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assign adc_pn_match2_s = ((adc_data == 16'd0) && (adc_data_d == 16'd0)) ? 1'b0 : 1'b1;
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assign adc_pn_match_s = adc_pn_match0_s & adc_pn_match1_s & adc_pn_match2_s;
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assign adc_pn_data_s = (adc_pn_oos == 1'b1) ? adc_pn_data_in_s : adc_pn_data;
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assign adc_pn_err_s = ~(adc_pn_oos | adc_pn_match);
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// PN running sequence
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always @(posedge adc_clk) begin
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adc_pn_type_m1 <= up_pn_type;
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adc_pn_type_m2 <= adc_pn_type_m1;
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adc_pn_type <= adc_pn_type_m2;
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adc_pn_en <= ~adc_pn_en;
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adc_data_d <= adc_data;
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if (adc_pn_en == 1'b1) begin
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if (adc_pn_type == 1'b0) begin
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adc_pn_data <= pn9(adc_pn_data_s);
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end else begin
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adc_pn_data <= pn23(adc_pn_data_s);
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end
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end
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end
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// PN OOS and counters (16 to clear, 64 to set). These numbers are actually determined
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// based on BER parameters set by the system (usually in network applications).
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always @(posedge adc_clk) begin
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adc_pn_en_d <= adc_pn_en;
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adc_pn_match <= adc_pn_match_s;
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if (adc_pn_en_d == 1'b1) begin
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if (adc_pn_oos == 1'b1) begin
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if (adc_pn_match == 1'b1) begin
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if (adc_pn_oos_count >= 16) begin
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adc_pn_oos_count <= 'd0;
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adc_pn_oos <= 'd0;
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end else begin
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adc_pn_oos_count <= adc_pn_oos_count + 1'b1;
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adc_pn_oos <= 'd1;
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end
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end else begin
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adc_pn_oos_count <= 'd0;
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adc_pn_oos <= 'd1;
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end
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end else begin
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if (adc_pn_match == 1'b0) begin
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if (adc_pn_oos_count >= 64) begin
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adc_pn_oos_count <= 'd0;
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adc_pn_oos <= 'd1;
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end else begin
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adc_pn_oos_count <= adc_pn_oos_count + 1'b1;
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adc_pn_oos <= 'd0;
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end
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end else begin
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adc_pn_oos_count <= 'd0;
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adc_pn_oos <= 'd0;
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end
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end
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end
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end
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// The error state is streched to multiple adc clocks such that processor
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// has enough time to sample the error condition.
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always @(posedge adc_clk) begin
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if (adc_pn_en_d == 1'b1) begin
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if (adc_pn_err_s == 1'b1) begin
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adc_pn_err_count <= 5'h10;
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end else if (adc_pn_err_count[4] == 1'b1) begin
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adc_pn_err_count <= adc_pn_err_count + 1'b1;
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end
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end
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adc_pn_err <= adc_pn_err_count[4];
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end
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endmodule
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// ***************************************************************************
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// ***************************************************************************
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