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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: crc_gen_xmii.v | |
4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved | |
5 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. | |
6 | // | |
7 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
8 | // | |
9 | // This program is free software; you can redistribute it and/or modify | |
10 | // it under the terms of the GNU General Public License as published by | |
11 | // the Free Software Foundation; version 2 of the License. | |
12 | // | |
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | // | |
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | // | |
22 | // For the avoidance of doubt, and except that if any non-GPL license | |
23 | // choice is available it will apply instead, Sun elects to use only | |
24 | // the General Public License version 2 (GPLv2) at this time for any | |
25 | // software where a choice of GPL license versions is made | |
26 | // available with the language indicating that GPLv2 or any later version | |
27 | // may be used, or where a choice of which version of the GPL is applied is | |
28 | // otherwise unspecified. | |
29 | // | |
30 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
31 | // CA 95054 USA or visit www.sun.com if you need additional information or | |
32 | // have any questions. | |
33 | // | |
34 | // ========== Copyright Header End ============================================ | |
35 | /*%W% %G%*/ | |
36 | ||
37 | /************************************************************************* | |
38 | * | |
39 | * File Name : crc_gen_xmii.v | |
40 | * Author Name : John Lo | |
41 | * Description : crc generation logic | |
42 | * Parent Module: rx_fcs_xmii | |
43 | * Child Module: | |
44 | * Interface Mod: many. | |
45 | * Date Created : 5/9/00 | |
46 | * | |
47 | * Copyright (c) 2002, Sun Microsystems, Inc. | |
48 | * Sun Proprietary and Confidential | |
49 | * | |
50 | * Modification : | |
51 | * | |
52 | * Synthesis Notes: | |
53 | * This module is very timing critical. It has | |
54 | * a long xor chain to calculate crc. Special care | |
55 | * must be taker to insure timing integrity. | |
56 | * It should be synthesized and layout independently | |
57 | * that the optimal timing goal can be achieved. | |
58 | * Written on Feb. 10th, 2000 - John Lo | |
59 | * | |
60 | *************************************************************************/ | |
61 | ||
62 | module crc_gen_xmii (clk,initialize_crc,compute_en, | |
63 | data_valid,dv_8bit, | |
64 | input_byte0,input_byte1,input_byte2, | |
65 | input_byte3,input_byte4,input_byte5, | |
66 | input_byte6,input_byte7, | |
67 | new_crc5_result, | |
68 | crc_result); | |
69 | input clk,initialize_crc,compute_en; | |
70 | // vlint flag_input_port_not_connected off | |
71 | input data_valid; | |
72 | // vlint flag_input_port_not_connected on | |
73 | input [7:0] dv_8bit; | |
74 | input [7:0] input_byte0; | |
75 | input [7:0] input_byte1; | |
76 | input [7:0] input_byte2; | |
77 | input [7:0] input_byte3; | |
78 | input [7:0] input_byte4; | |
79 | input [7:0] input_byte5; | |
80 | input [7:0] input_byte6; | |
81 | input [7:0] input_byte7; | |
82 | output [31:0] new_crc5_result; | |
83 | output [31:0] crc_result; | |
84 | ||
85 | wire [31:0] new_crc0; | |
86 | wire [31:0] new_crc1; | |
87 | wire [31:0] new_crc2; | |
88 | wire [31:0] new_crc3; | |
89 | wire [31:0] new_crc4; | |
90 | wire [31:0] new_crc5; | |
91 | wire [31:0] new_crc6; | |
92 | wire [31:0] new_crc7; | |
93 | wire [31:0] new_crc_final; | |
94 | wire [31:0] current_crc_final; | |
95 | reg [31:0] new_crc_result; | |
96 | wire [31:0] new_crc5_result = ~new_crc5; | |
97 | // vlint flag_dangling_net_within_module off | |
98 | // vlint flag_net_has_no_load off | |
99 | // vlint flag_input_port_not_connected off | |
100 | wire data_valid; | |
101 | // vlint flag_input_port_not_connected on | |
102 | // vlint flag_net_has_no_load on | |
103 | // vlint flag_dangling_net_within_module on | |
104 | ||
105 | crc_com_part stage0(.input_byte(input_byte0),.current_crc(current_crc_final),.new_crc(new_crc0)); | |
106 | crc_com_part stage1(.input_byte(input_byte1),.current_crc(new_crc0),.new_crc(new_crc1)); | |
107 | crc_com_part stage2(.input_byte(input_byte2),.current_crc(new_crc1),.new_crc(new_crc2)); | |
108 | crc_com_part stage3(.input_byte(input_byte3),.current_crc(new_crc2),.new_crc(new_crc3)); | |
109 | crc_com_part stage4(.input_byte(input_byte4),.current_crc(new_crc3),.new_crc(new_crc4)); | |
110 | crc_com_part stage5(.input_byte(input_byte5),.current_crc(new_crc4),.new_crc(new_crc5)); | |
111 | crc_com_part stage6(.input_byte(input_byte6),.current_crc(new_crc5),.new_crc(new_crc6)); | |
112 | crc_com_part stage7(.input_byte(input_byte7),.current_crc(new_crc6),.new_crc(new_crc7)); | |
113 | ||
114 | assign new_crc_final = initialize_crc ? 32'hff_ff_ff_ff : | |
115 | compute_en ? new_crc_result : current_crc_final; | |
116 | ||
117 | // vlint flag_variable_in_sensitivity_list_not_used_in_block off | |
118 | always @ (/*AUTOSENSE*/data_valid or dv_8bit or new_crc0 or new_crc1 | |
119 | or new_crc2 or new_crc3 or new_crc4 or new_crc5 or new_crc6 | |
120 | or new_crc7) | |
121 | begin | |
122 | casex (dv_8bit) // synopsys parallel_case full_case | |
123 | 8'b1xxxxxxx: new_crc_result = new_crc7; | |
124 | 8'b01xxxxxx: new_crc_result = new_crc6; | |
125 | 8'b001xxxxx: new_crc_result = new_crc5; | |
126 | 8'b0001xxxx: new_crc_result = new_crc4; | |
127 | 8'b00001xxx: new_crc_result = new_crc3; | |
128 | 8'b000001xx: new_crc_result = new_crc2; | |
129 | 8'b0000001x: new_crc_result = new_crc1; | |
130 | 8'b00000001: new_crc_result = new_crc0; | |
131 | default: begin | |
132 | new_crc_result = new_crc7; | |
133 | // synopsys translate_off | |
134 | if (data_valid) | |
135 | $display("\n (* ERROR: at sim time = %d, crc_gen contains invalid combination of dv_8bit = %b *) \n", $time, dv_8bit); | |
136 | else ; | |
137 | // synopsys translate_on | |
138 | end // case: default | |
139 | endcase // casex(dv_8bit) | |
140 | end // always @ (... | |
141 | // vlint flag_variable_in_sensitivity_list_not_used_in_block on | |
142 | ||
143 | register_X32 rx_crc_result_register_X32(.clk(clk),.din(new_crc_final),.dout(current_crc_final),.dout_n(crc_result)); | |
144 | ||
145 | endmodule // crc_gen_xmii | |
146 | ||
147 | ||
148 | ||
149 | module crc_com_part (input_byte,current_crc,new_crc); | |
150 | input [7:0] input_byte; | |
151 | input [31:0] current_crc; | |
152 | output [31:0] new_crc; | |
153 | ||
154 | wire [7:0] crc_in; | |
155 | wire [31:0] current_crc,new_crc; | |
156 | //\f | |
157 | assign crc_in[0] = current_crc[31] ^ input_byte[7]; | |
158 | assign crc_in[1] = current_crc[30] ^ input_byte[6]; | |
159 | assign crc_in[2] = current_crc[29] ^ input_byte[5]; | |
160 | assign crc_in[3] = current_crc[28] ^ input_byte[4]; | |
161 | assign crc_in[4] = current_crc[27] ^ input_byte[3]; | |
162 | assign crc_in[5] = current_crc[26] ^ input_byte[2]; | |
163 | assign crc_in[6] = current_crc[25] ^ input_byte[1] ^ crc_in[0]; | |
164 | assign crc_in[7] = current_crc[24] ^ input_byte[0] ^ crc_in[1]; | |
165 | ||
166 | assign new_crc[31] = (current_crc[23] ^ crc_in[2]) ; | |
167 | assign new_crc[30] = (current_crc[22] ^ crc_in[0] ^ crc_in[3]); | |
168 | assign new_crc[29] = (current_crc[21] ^ crc_in[0] ^ crc_in[1] ^ crc_in[4]); | |
169 | assign new_crc[28] = (current_crc[20] ^ crc_in[1] ^ crc_in[2] ^ crc_in[5]); | |
170 | assign new_crc[27] = (current_crc[19] ^ crc_in[2] ^ crc_in[3] ^ crc_in[6]); | |
171 | assign new_crc[26] = (current_crc[18] ^ crc_in[3] ^ crc_in[4] ^ crc_in[7]); | |
172 | assign new_crc[25] = (current_crc[17] ^ crc_in[4] ^ crc_in[5]); | |
173 | assign new_crc[24] = (current_crc[16] ^ crc_in[5] ^ crc_in[6]); | |
174 | assign new_crc[23] = (current_crc[15] ^ crc_in[0] ^ crc_in[6] ^ crc_in[7]); | |
175 | assign new_crc[22] = (current_crc[14] ^ crc_in[1] ^ crc_in[7]); | |
176 | assign new_crc[21] = (current_crc[13] ^ crc_in[2]); | |
177 | assign new_crc[20] = (current_crc[12] ^ crc_in[3]); | |
178 | assign new_crc[19] = (current_crc[11] ^ crc_in[0] ^ crc_in[4]); | |
179 | assign new_crc[18] = (current_crc[10] ^ crc_in[0] ^ crc_in[1] ^ crc_in[5]); | |
180 | assign new_crc[17] = (current_crc[9] ^ crc_in[0] ^ crc_in[1] ^ crc_in[2] ^ crc_in[6]); | |
181 | assign new_crc[16] = (current_crc[8] ^ crc_in[1] ^ crc_in[2] ^ crc_in[3] ^ crc_in[7]); | |
182 | assign new_crc[15] = (current_crc[7] ^ crc_in[0] ^ crc_in[2] ^ crc_in[3] ^ crc_in[4]); | |
183 | assign new_crc[14] = (current_crc[6] ^ crc_in[0] ^ crc_in[1] ^ crc_in[3] ^ crc_in[4] ^ crc_in[5]); | |
184 | assign new_crc[13] = (current_crc[5] ^ crc_in[1] ^ crc_in[2] ^ crc_in[4] ^ crc_in[5] ^ crc_in[6]); | |
185 | assign new_crc[12] = (current_crc[4] ^ crc_in[0] ^ crc_in[2] ^ crc_in[3] ^ crc_in[5] ^ crc_in[6] ^ crc_in[7]); | |
186 | assign new_crc[11] = (current_crc[3] ^ crc_in[0] ^ crc_in[1] ^ crc_in[3] ^ crc_in[4] ^ crc_in[6] ^ crc_in[7]); | |
187 | assign new_crc[10] = (current_crc[2] ^ crc_in[1] ^ crc_in[2] ^ crc_in[4] ^ crc_in[5] ^ crc_in[7]); | |
188 | assign new_crc[9] = (current_crc[1] ^ crc_in[0] ^ crc_in[2] ^ crc_in[3] ^ crc_in[5] ^ crc_in[6]); | |
189 | assign new_crc[8] = (current_crc[0] ^ crc_in[0] ^ crc_in[1] ^ crc_in[3] ^ crc_in[4] ^ crc_in[6] ^ crc_in[7]); | |
190 | assign new_crc[7] = (crc_in[0] ^ crc_in[1] ^ crc_in[2] ^ crc_in[4] ^ crc_in[5] ^ crc_in[7]); | |
191 | assign new_crc[6] = (crc_in[1] ^ crc_in[2] ^ crc_in[3] ^ crc_in[5] ^ crc_in[6]); | |
192 | assign new_crc[5] = (crc_in[2] ^ crc_in[3] ^ crc_in[4] ^ crc_in[6] ^ crc_in[7]); | |
193 | assign new_crc[4] = (crc_in[3] ^ crc_in[4] ^ crc_in[5] ^ crc_in[7]); | |
194 | assign new_crc[3] = (crc_in[4] ^ crc_in[5] ^ crc_in[6]); | |
195 | assign new_crc[2] = (crc_in[5] ^ crc_in[6] ^ crc_in[7]); | |
196 | assign new_crc[1] = (crc_in[6] ^ crc_in[7]); | |
197 | assign new_crc[0] = crc_in[7]; | |
198 | ||
199 | endmodule // crc_com_part | |
200 | ||
201 |