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//////////////////////////////////////////////////////////////////////
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//// ////
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//// can_acf.v ////
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//// ////
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//// ////
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//// This file is part of the CAN Protocol Controller ////
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//// http://www.opencores.org/projects/can/ ////
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//// ////
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//// ////
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//// Author(s): ////
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//// Igor Mohor ////
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//// igorm@opencores.org ////
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//// ////
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//// ////
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//// All additional information is available in the README.txt ////
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//// file. ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2002, 2003 Authors ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS Revision History
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//
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// $Log: not supported by cvs2svn $
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mohor |
// Revision 1.1 2003/01/08 02:13:15 mohor
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// Acceptance filter added.
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11 |
mohor |
//
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//
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//
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mohor |
//
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mohor |
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// synopsys translate_off
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`include "timescale.v"
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// synopsys translate_on
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`include "can_defines.v"
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module can_acf
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(
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clk,
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rst,
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id,
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/* Mode register */
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reset_mode,
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acceptance_filter_mode,
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extended_mode,
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acceptance_code_0,
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acceptance_code_1,
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acceptance_code_2,
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acceptance_code_3,
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acceptance_mask_0,
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acceptance_mask_1,
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acceptance_mask_2,
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acceptance_mask_3,
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sample_point,
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go_rx_crc_lim,
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go_rx_idle,
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data0,
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data1,
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rtr1,
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rtr2,
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ide,
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mohor |
no_byte0,
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no_byte1,
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mohor |
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id_ok
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);
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parameter Tp = 1;
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input clk;
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input rst;
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input [28:0] id;
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input reset_mode;
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input acceptance_filter_mode;
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input extended_mode;
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input [7:0] acceptance_code_0;
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input [7:0] acceptance_code_1;
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input [7:0] acceptance_code_2;
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input [7:0] acceptance_code_3;
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input [7:0] acceptance_mask_0;
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input [7:0] acceptance_mask_1;
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input [7:0] acceptance_mask_2;
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input [7:0] acceptance_mask_3;
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input sample_point;
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input go_rx_crc_lim;
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input go_rx_idle;
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input [7:0] data0;
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input [7:0] data1;
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input rtr1;
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input rtr2;
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input ide;
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mohor |
input no_byte0;
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input no_byte1;
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mohor |
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output id_ok;
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reg id_ok;
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wire match;
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wire match_sf_std;
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wire match_sf_ext;
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wire match_df_std;
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wire match_df_ext;
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// Working in basic mode. ID match for standard format (11-bit ID).
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assign match = ( (id[3] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
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(id[4] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
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(id[5] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
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(id[6] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
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(id[7] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
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(id[8] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
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(id[9] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
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(id[10] == acceptance_code_0[7] | acceptance_mask_0[7] )
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);
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// Working in extended mode. ID match for standard format (11-bit ID). Using single filter.
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assign match_sf_std = ( (id[3] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
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(id[4] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
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(id[5] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
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(id[6] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
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(id[7] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
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(id[8] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
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(id[9] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
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(id[10] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
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(rtr1 == acceptance_code_1[4] | acceptance_mask_1[4] ) &
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(id[0] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
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(id[1] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
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(id[2] == acceptance_code_1[7] | acceptance_mask_1[7] ) &
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mohor |
(data0[0] == acceptance_code_2[0] | acceptance_mask_2[0] | no_byte0) &
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(data0[1] == acceptance_code_2[1] | acceptance_mask_2[1] | no_byte0) &
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(data0[2] == acceptance_code_2[2] | acceptance_mask_2[2] | no_byte0) &
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(data0[3] == acceptance_code_2[3] | acceptance_mask_2[3] | no_byte0) &
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(data0[4] == acceptance_code_2[4] | acceptance_mask_2[4] | no_byte0) &
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(data0[5] == acceptance_code_2[5] | acceptance_mask_2[5] | no_byte0) &
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(data0[6] == acceptance_code_2[6] | acceptance_mask_2[6] | no_byte0) &
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(data0[7] == acceptance_code_2[7] | acceptance_mask_2[7] | no_byte0) &
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mohor |
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16 |
mohor |
(data1[0] == acceptance_code_3[0] | acceptance_mask_3[0] | no_byte1) &
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(data1[1] == acceptance_code_3[1] | acceptance_mask_3[1] | no_byte1) &
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(data1[2] == acceptance_code_3[2] | acceptance_mask_3[2] | no_byte1) &
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(data1[3] == acceptance_code_3[3] | acceptance_mask_3[3] | no_byte1) &
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(data1[4] == acceptance_code_3[4] | acceptance_mask_3[4] | no_byte1) &
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(data1[5] == acceptance_code_3[5] | acceptance_mask_3[5] | no_byte1) &
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(data1[6] == acceptance_code_3[6] | acceptance_mask_3[6] | no_byte1) &
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(data1[7] == acceptance_code_3[7] | acceptance_mask_3[7] | no_byte1)
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11 |
mohor |
);
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16 |
mohor |
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11 |
mohor |
// Working in extended mode. ID match for extended format (29-bit ID). Using single filter.
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assign match_sf_ext = ( (id[21] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
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(id[22] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
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(id[23] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
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(id[24] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
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(id[25] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
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(id[26] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
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(id[27] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
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(id[28] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
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(id[13] == acceptance_code_1[0] | acceptance_mask_1[0] ) &
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(id[14] == acceptance_code_1[1] | acceptance_mask_1[1] ) &
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| 200 |
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(id[15] == acceptance_code_1[2] | acceptance_mask_1[2] ) &
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| 201 |
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(id[16] == acceptance_code_1[3] | acceptance_mask_1[3] ) &
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| 202 |
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(id[17] == acceptance_code_1[4] | acceptance_mask_1[4] ) &
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| 203 |
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(id[18] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
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| 204 |
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(id[19] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
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| 205 |
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(id[20] == acceptance_code_1[7] | acceptance_mask_1[7] ) &
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| 206 |
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| 207 |
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(id[5] == acceptance_code_2[0] | acceptance_mask_2[0] ) &
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| 208 |
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(id[6] == acceptance_code_2[1] | acceptance_mask_2[1] ) &
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| 209 |
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(id[7] == acceptance_code_2[2] | acceptance_mask_2[2] ) &
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| 210 |
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(id[8] == acceptance_code_2[3] | acceptance_mask_2[3] ) &
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| 211 |
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(id[9] == acceptance_code_2[4] | acceptance_mask_2[4] ) &
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| 212 |
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(id[10] == acceptance_code_2[5] | acceptance_mask_2[5] ) &
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| 213 |
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(id[11] == acceptance_code_2[6] | acceptance_mask_2[6] ) &
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| 214 |
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(id[12] == acceptance_code_2[7] | acceptance_mask_2[7] ) &
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| 215 |
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| 216 |
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(rtr2 == acceptance_code_3[2] | acceptance_mask_3[2] ) &
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| 217 |
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(id[0] == acceptance_code_3[3] | acceptance_mask_3[3] ) &
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| 218 |
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(id[1] == acceptance_code_3[4] | acceptance_mask_3[4] ) &
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| 219 |
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(id[2] == acceptance_code_3[5] | acceptance_mask_3[5] ) &
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| 220 |
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(id[3] == acceptance_code_3[6] | acceptance_mask_3[6] ) &
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| 221 |
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(id[4] == acceptance_code_3[7] | acceptance_mask_3[7] )
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| 222 |
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| 223 |
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);
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| 224 |
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| 225 |
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| 226 |
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// Working in extended mode. ID match for standard format (11-bit ID). Using double filter.
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| 227 |
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assign match_df_std = (((id[3] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
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| 228 |
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(id[4] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
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| 229 |
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(id[5] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
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| 230 |
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(id[6] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
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| 231 |
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(id[7] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
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| 232 |
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(id[8] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
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| 233 |
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(id[9] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
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| 234 |
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(id[10] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
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| 235 |
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| 236 |
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(rtr1 == acceptance_code_1[4] | acceptance_mask_1[4] ) &
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| 237 |
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(id[0] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
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| 238 |
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(id[1] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
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| 239 |
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(id[2] == acceptance_code_1[7] | acceptance_mask_1[7] ) &
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| 240 |
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| 241 |
16 |
mohor |
(data0[0] == acceptance_code_3[0] | acceptance_mask_3[0] | no_byte0) &
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| 242 |
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(data0[1] == acceptance_code_3[1] | acceptance_mask_3[1] | no_byte0) &
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| 243 |
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(data0[2] == acceptance_code_3[2] | acceptance_mask_3[2] | no_byte0) &
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| 244 |
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(data0[3] == acceptance_code_3[3] | acceptance_mask_3[3] | no_byte0) &
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| 245 |
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(data0[4] == acceptance_code_1[4] | acceptance_mask_1[4] | no_byte0) &
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| 246 |
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(data0[5] == acceptance_code_1[5] | acceptance_mask_1[5] | no_byte0) &
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| 247 |
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(data0[6] == acceptance_code_1[6] | acceptance_mask_1[6] | no_byte0) &
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| 248 |
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(data0[7] == acceptance_code_1[7] | acceptance_mask_1[7] | no_byte0) )
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| 249 |
11 |
mohor |
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| 250 |
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| 251 |
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| 252 |
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((id[3] == acceptance_code_2[0] | acceptance_mask_2[0] ) &
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| 253 |
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(id[4] == acceptance_code_2[1] | acceptance_mask_2[1] ) &
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| 254 |
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(id[5] == acceptance_code_2[2] | acceptance_mask_2[2] ) &
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| 255 |
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(id[6] == acceptance_code_2[3] | acceptance_mask_2[3] ) &
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| 256 |
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(id[7] == acceptance_code_2[4] | acceptance_mask_2[4] ) &
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| 257 |
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(id[8] == acceptance_code_2[5] | acceptance_mask_2[5] ) &
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| 258 |
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(id[9] == acceptance_code_2[6] | acceptance_mask_2[6] ) &
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| 259 |
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(id[10] == acceptance_code_2[7] | acceptance_mask_2[7] ) &
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| 260 |
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| 261 |
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(rtr1 == acceptance_code_3[4] | acceptance_mask_3[4] ) &
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| 262 |
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(id[0] == acceptance_code_3[5] | acceptance_mask_3[5] ) &
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| 263 |
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(id[1] == acceptance_code_3[6] | acceptance_mask_3[6] ) &
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| 264 |
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(id[2] == acceptance_code_3[7] | acceptance_mask_3[7] ) )
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| 265 |
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|
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| 266 |
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);
|
| 267 |
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|
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| 268 |
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|
| 269 |
|
|
// Working in extended mode. ID match for extended format (29-bit ID). Using double filter.
|
| 270 |
|
|
assign match_df_ext = (((id[21] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
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| 271 |
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(id[22] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
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| 272 |
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(id[23] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
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| 273 |
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(id[24] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
|
| 274 |
|
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(id[25] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
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| 275 |
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(id[26] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
|
| 276 |
|
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(id[27] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
|
| 277 |
|
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(id[28] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
|
| 278 |
|
|
|
| 279 |
|
|
(id[13] == acceptance_code_1[0] | acceptance_mask_1[0] ) &
|
| 280 |
|
|
(id[14] == acceptance_code_1[1] | acceptance_mask_1[1] ) &
|
| 281 |
|
|
(id[15] == acceptance_code_1[2] | acceptance_mask_1[2] ) &
|
| 282 |
|
|
(id[16] == acceptance_code_1[3] | acceptance_mask_1[3] ) &
|
| 283 |
|
|
(id[17] == acceptance_code_1[4] | acceptance_mask_1[4] ) &
|
| 284 |
|
|
(id[18] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
|
| 285 |
|
|
(id[19] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
|
| 286 |
|
|
(id[20] == acceptance_code_1[7] | acceptance_mask_1[7] ) )
|
| 287 |
|
|
|
| 288 |
|
|
|
|
| 289 |
|
|
|
| 290 |
|
|
((id[21] == acceptance_code_2[0] | acceptance_mask_2[0] ) &
|
| 291 |
|
|
(id[22] == acceptance_code_2[1] | acceptance_mask_2[1] ) &
|
| 292 |
|
|
(id[23] == acceptance_code_2[2] | acceptance_mask_2[2] ) &
|
| 293 |
|
|
(id[24] == acceptance_code_2[3] | acceptance_mask_2[3] ) &
|
| 294 |
|
|
(id[25] == acceptance_code_2[4] | acceptance_mask_2[4] ) &
|
| 295 |
|
|
(id[26] == acceptance_code_2[5] | acceptance_mask_2[5] ) &
|
| 296 |
|
|
(id[27] == acceptance_code_2[6] | acceptance_mask_2[6] ) &
|
| 297 |
|
|
(id[28] == acceptance_code_2[7] | acceptance_mask_2[7] ) &
|
| 298 |
|
|
|
| 299 |
|
|
(id[13] == acceptance_code_3[0] | acceptance_mask_3[0] ) &
|
| 300 |
|
|
(id[14] == acceptance_code_3[1] | acceptance_mask_3[1] ) &
|
| 301 |
|
|
(id[15] == acceptance_code_3[2] | acceptance_mask_3[2] ) &
|
| 302 |
|
|
(id[16] == acceptance_code_3[3] | acceptance_mask_3[3] ) &
|
| 303 |
|
|
(id[17] == acceptance_code_3[4] | acceptance_mask_3[4] ) &
|
| 304 |
|
|
(id[18] == acceptance_code_3[5] | acceptance_mask_3[5] ) &
|
| 305 |
|
|
(id[19] == acceptance_code_3[6] | acceptance_mask_3[6] ) &
|
| 306 |
|
|
(id[20] == acceptance_code_3[7] | acceptance_mask_3[7] ) )
|
| 307 |
|
|
);
|
| 308 |
|
|
|
| 309 |
|
|
|
| 310 |
|
|
|
| 311 |
|
|
// ID ok signal generation
|
| 312 |
|
|
always @ (posedge clk or posedge rst)
|
| 313 |
|
|
begin
|
| 314 |
|
|
if (rst)
|
| 315 |
|
|
id_ok <= 0;
|
| 316 |
|
|
else if (go_rx_crc_lim) // sample_point is already included in go_rx_crc_lim
|
| 317 |
|
|
begin
|
| 318 |
|
|
if (extended_mode)
|
| 319 |
|
|
begin
|
| 320 |
|
|
if (acceptance_filter_mode) // dual filter
|
| 321 |
|
|
begin
|
| 322 |
|
|
if (ide) // extended frame message
|
| 323 |
|
|
id_ok <=#Tp match_df_ext;
|
| 324 |
|
|
else // standard frame message
|
| 325 |
|
|
id_ok <=#Tp match_df_std;
|
| 326 |
|
|
end
|
| 327 |
|
|
else // single filter
|
| 328 |
|
|
begin
|
| 329 |
|
|
if (ide) // extended frame message
|
| 330 |
|
|
id_ok <=#Tp match_sf_ext;
|
| 331 |
|
|
else // standard frame message
|
| 332 |
|
|
id_ok <=#Tp match_sf_std;
|
| 333 |
|
|
end
|
| 334 |
|
|
end
|
| 335 |
|
|
else
|
| 336 |
|
|
id_ok <=#Tp match;
|
| 337 |
|
|
end
|
| 338 |
|
|
else if (reset_mode | go_rx_idle) // sample_point is already included in go_rx_idle
|
| 339 |
|
|
id_ok <=#Tp 0;
|
| 340 |
|
|
end
|
| 341 |
|
|
|
| 342 |
|
|
|
| 343 |
|
|
|
| 344 |
|
|
|
| 345 |
|
|
|
| 346 |
|
|
|
| 347 |
|
|
|
| 348 |
|
|
|
| 349 |
|
|
|
| 350 |
|
|
endmodule
|
