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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: ipg_checker.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 : ipg_checker.v | |
40 | * Author Name : John Lo | |
41 | * Description : For checking variable ipg. | |
42 | * Parent Module: xmac | |
43 | * Child Module: | |
44 | * Interface Mod: | |
45 | * Date Created : 3/24/04 | |
46 | * | |
47 | * Copyright (c) 2020, Sun Microsystems, Inc. | |
48 | * Sun Proprietary and Confidential | |
49 | * | |
50 | * | |
51 | * Modification : | |
52 | * | |
53 | * Synthesis Notes: | |
54 | * | |
55 | ******************************************************************/ | |
56 | ||
57 | `include "xmac.h" | |
58 | ||
59 | module ipg_checker ( | |
60 | tx_clk, | |
61 | tx_reset, | |
62 | xgmii_txc, | |
63 | xgmii_txd, | |
64 | var_min_ipg_en, | |
65 | add_crc, | |
66 | eop_txclk, | |
67 | B_eop, | |
68 | stretch_mode, | |
69 | warning_msg_en | |
70 | ); | |
71 | input tx_clk; | |
72 | input tx_reset; | |
73 | input [3:0] xgmii_txc; | |
74 | input [31:0] xgmii_txd; | |
75 | input var_min_ipg_en; | |
76 | input add_crc; | |
77 | input eop_txclk; | |
78 | input B_eop; | |
79 | input stretch_mode; | |
80 | input warning_msg_en; | |
81 | ||
82 | wire dly1_tx_clk; | |
83 | wire dly2_tx_clk; | |
84 | wire x2_tx_clk; | |
85 | wire x2_tx_reset; | |
86 | wire ipg_count_en_temp; | |
87 | wire ipg_count_en; | |
88 | wire T_det; | |
89 | wire S_det; | |
90 | wire store_ipg_time; | |
91 | reg check_ipg_time; | |
92 | reg [`BYTE] ipg_count; | |
93 | reg [`BYTE] ipg_net_credit; | |
94 | reg [`BYTE] stored_ipg_count; | |
95 | reg [3:0] itxc; | |
96 | reg [31:0] itxd; | |
97 | ||
98 | ||
99 | ||
100 | SYNC_CELL SYNC_X2_TX_RESET(.D(tx_reset),.CP(x2_tx_clk),.Q(x2_tx_reset)); | |
101 | assign #1 dly1_tx_clk = tx_clk; | |
102 | assign #1 dly2_tx_clk = dly1_tx_clk; | |
103 | assign x2_tx_clk = dly1_tx_clk ^ dly2_tx_clk; | |
104 | ||
105 | always @ (posedge x2_tx_clk) | |
106 | if (x2_tx_reset) | |
107 | begin | |
108 | itxc <= 0; | |
109 | itxd <= 0; | |
110 | end // if (!tx_reset_n) | |
111 | else | |
112 | begin | |
113 | itxc <= xgmii_txc; | |
114 | itxd <= xgmii_txd; | |
115 | end | |
116 | ||
117 | assign T_det = | |
118 | itxc[0] & (itxd[`BYTE0] == `T) | // lane0 | |
119 | itxc[1] & (itxd[`BYTE1] == `T) | // lane1 | |
120 | itxc[2] & (itxd[`BYTE2] == `T) | // lane2 | |
121 | itxc[3] & (itxd[`BYTE3] == `T) ; // lane3 | |
122 | ||
123 | assign S_det = itxc[0] & (itxd[`BYTE0] == `S); // lane0 | |
124 | ||
125 | ||
126 | RSFF ipg_count_en_RSFF(.reset(x2_tx_reset), | |
127 | .clk( x2_tx_clk), | |
128 | .iSet(T_det), | |
129 | .iRst(S_det), | |
130 | .oQ(ipg_count_en_temp)); | |
131 | ||
132 | assign ipg_count_en = (ipg_count_en_temp | T_det) & (~S_det); | |
133 | ||
134 | PlsGen2 store_ipg_time_PlsGen2( | |
135 | .sig_in(ipg_count_en), | |
136 | .clk(x2_tx_clk), | |
137 | .lead(),.trail(store_ipg_time)); | |
138 | ||
139 | wire [`BYTE] itxc_bit0 = {7'b0,itxc[0]}; | |
140 | wire [`BYTE] itxc_bit1 = {7'b0,itxc[1]}; | |
141 | wire [`BYTE] itxc_bit2 = {7'b0,itxc[2]}; | |
142 | wire [`BYTE] itxc_bit3 = {7'b0,itxc[3]}; | |
143 | ||
144 | wire [`BYTE] itxc_count = itxc_bit0 + itxc_bit1 + itxc_bit2 + itxc_bit3; | |
145 | ||
146 | always @ (posedge x2_tx_clk) | |
147 | check_ipg_time <= store_ipg_time; | |
148 | ||
149 | ||
150 | always @ (posedge x2_tx_clk) | |
151 | if (x2_tx_reset | store_ipg_time) | |
152 | ipg_count <= 0; | |
153 | else if (ipg_count_en) | |
154 | ipg_count <= itxc_count + ipg_count; | |
155 | else | |
156 | ipg_count <= ipg_count; | |
157 | ||
158 | always @ (posedge x2_tx_clk) | |
159 | if (x2_tx_reset) | |
160 | stored_ipg_count <= 0; | |
161 | else if (store_ipg_time) | |
162 | stored_ipg_count <= ipg_count; | |
163 | else | |
164 | stored_ipg_count <= stored_ipg_count; | |
165 | ||
166 | always @ (posedge x2_tx_clk) | |
167 | if (x2_tx_reset) | |
168 | ipg_net_credit <= `CREDIT_BIAS; | |
169 | else if (store_ipg_time) | |
170 | begin | |
171 | if (ipg_count >= `CREDIT_BIAS) | |
172 | ipg_net_credit <= ipg_net_credit + (ipg_count - `CREDIT_BIAS); | |
173 | else | |
174 | ipg_net_credit <= ipg_net_credit - (`CREDIT_BIAS - ipg_count); | |
175 | end | |
176 | else ipg_net_credit <= ipg_net_credit; | |
177 | ||
178 | wire stored_add_crc; | |
179 | wire stored_B_eop; | |
180 | ||
181 | xREG #(1) stored_add_crc_xREG(.din(add_crc), | |
182 | .clk(x2_tx_clk), | |
183 | .en(eop_txclk), | |
184 | .reset(x2_tx_reset), | |
185 | .qout(stored_add_crc)); | |
186 | ||
187 | xREG #(1) stored_B_eop_xREG(.din(B_eop), | |
188 | .clk(x2_tx_clk), | |
189 | .en(eop_txclk), | |
190 | .reset(x2_tx_reset), | |
191 | .qout(stored_B_eop)); | |
192 | ||
193 | always @ (negedge check_ipg_time) // LAN mode only | |
194 | begin | |
195 | if (warning_msg_en & (~x2_tx_reset) & var_min_ipg_en & (~stretch_mode) & | |
196 | ((stored_ipg_count < 9) | (stored_ipg_count > 15))) | |
197 | $display(" \n(* ERROR: at sim time = %d, from ipg_checker module, the ipg_checker has detected incorrect ipg value, stored_ipg_count = %d *)", $time, stored_ipg_count); | |
198 | else ; | |
199 | end | |
200 | ||
201 | ||
202 | always @ (negedge check_ipg_time) | |
203 | begin | |
204 | if (warning_msg_en & ~x2_tx_reset) | |
205 | begin | |
206 | if (stretch_mode) // WAN mode | |
207 | $display("\n (* WARNING: from ipg_checker module, stored_ipg_count = %d, stored_add_crc = %h, stored_B_eop = %h, at sim time = %d, *)", stored_ipg_count,stored_add_crc, stored_B_eop, $time); | |
208 | else // LAN mode | |
209 | $display("\n (* WARNING: from ipg_checker module, stored_ipg_count = %d, ipg_net_credit = %d, stored_add_crc = %h, stored_B_eop = %h, at sim time = %d, *)", stored_ipg_count, ipg_net_credit, stored_add_crc, stored_B_eop, $time); | |
210 | end | |
211 | else ; | |
212 | end | |
213 | ||
214 | endmodule // ipg_checker | |
215 |