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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: xrlm_sm.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 : xrlm_sm.v | |
40 | * Author Name : John Lo | |
41 | * Description : xgmii receive link manager state machine. | |
42 | * Parent Module: rx_xmac | |
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 | * | |
54 | *************************************************************************/ | |
55 | ||
56 | module xrlm_sm ( | |
57 | rx_clk, | |
58 | rx_reset, | |
59 | rx_enable_rxclk, | |
60 | rx_data_valid_gmux, | |
61 | rx_data_valid_gmux_lead,//rx_1st_word_time == rx_data_valid_gmux_lead | |
62 | da_match_err, | |
63 | rxfifo_full_rxclk, | |
64 | rxfifo_afull_rxclk, | |
65 | max_pkt_size_limit, | |
66 | err_chk_dis, | |
67 | link_fault, | |
68 | // outputs | |
69 | valid_data, | |
70 | set_err_time, | |
71 | eop, | |
72 | rx_ok, | |
73 | err_cond, | |
74 | xrlm_state | |
75 | ); | |
76 | ||
77 | ||
78 | input rx_clk; | |
79 | input rx_reset; | |
80 | input rx_enable_rxclk; | |
81 | input rx_data_valid_gmux; | |
82 | input rx_data_valid_gmux_lead;//rx_1st_word_time == rx_data_valid_gmux_lead | |
83 | input da_match_err; | |
84 | input rxfifo_full_rxclk; | |
85 | input rxfifo_afull_rxclk; | |
86 | input max_pkt_size_limit; | |
87 | input err_chk_dis; | |
88 | input link_fault; | |
89 | // outputs | |
90 | output valid_data; | |
91 | output set_err_time; | |
92 | output eop; | |
93 | output rx_ok; | |
94 | output err_cond; | |
95 | output xrlm_state; | |
96 | ||
97 | reg valid_data; | |
98 | reg set_err_time; | |
99 | reg eop; | |
100 | reg nx_xrlm_state; | |
101 | wire xrlm_state; | |
102 | wire rx_ok,err_cond; | |
103 | // rx_1st_word_time == rx_data_valid_gmux_lead | |
104 | assign rx_ok = rx_data_valid_gmux_lead & !da_match_err & ~link_fault & | |
105 | ~(rxfifo_afull_rxclk | rxfifo_full_rxclk) & rx_enable_rxclk; | |
106 | ||
107 | // There is no min_pkt_size_err,crc_err. Since rlm_sm won't be able | |
108 | // to see them in time. | |
109 | assign err_cond = link_fault | rxfifo_afull_rxclk | (~err_chk_dis & ( max_pkt_size_limit)); | |
110 | ||
111 | ||
112 | parameter IDLE = 1'h0, | |
113 | RX_BODY = 1'h1; | |
114 | ||
115 | // com part | |
116 | always @ (xrlm_state or | |
117 | rx_ok or rx_data_valid_gmux or | |
118 | err_cond ) | |
119 | begin | |
120 | nx_xrlm_state= IDLE; | |
121 | valid_data = 1'b0; | |
122 | set_err_time = 1'b0; | |
123 | eop = 1'b0; | |
124 | ||
125 | casex(xrlm_state) // synopsys parallel_case full_case | |
126 | IDLE: | |
127 | if (rx_ok) | |
128 | begin | |
129 | nx_xrlm_state= RX_BODY; | |
130 | valid_data = 1; | |
131 | end // if (rx_ok) | |
132 | else | |
133 | begin | |
134 | nx_xrlm_state= xrlm_state; | |
135 | valid_data = 0; | |
136 | end // else: !if(rx_ok) | |
137 | ||
138 | RX_BODY: | |
139 | begin | |
140 | valid_data = 1; | |
141 | if (err_cond) | |
142 | begin | |
143 | nx_xrlm_state= IDLE; | |
144 | set_err_time = 1; | |
145 | eop = 1; | |
146 | valid_data = 0; | |
147 | end // if (err_cond) | |
148 | else if (~rx_data_valid_gmux) | |
149 | begin | |
150 | nx_xrlm_state= IDLE; | |
151 | eop = 1; | |
152 | valid_data = 0; | |
153 | end // if (~rx_data_valid_gmux) | |
154 | else | |
155 | begin | |
156 | nx_xrlm_state= RX_BODY; | |
157 | valid_data = 1; | |
158 | end // else: !if(~rx_data_valid_gmux) | |
159 | end // case: RX_BODY | |
160 | ||
161 | default: | |
162 | begin | |
163 | nx_xrlm_state= IDLE; | |
164 | valid_data = 1'b0; | |
165 | set_err_time = 1'b0; | |
166 | eop = 1'b0; | |
167 | // synopsys translate_off | |
168 | $display("( Warning: xrlm_state in unknown state.)"); | |
169 | // synopsys translate_on | |
170 | end // case: default | |
171 | endcase // casex(xrlm_state) | |
172 | end // always @ (xrlm_state or... | |
173 | ||
174 | ||
175 | ||
176 | // seq part | |
177 | RegRst #(1) xrlm_state_RegRst(.din(nx_xrlm_state), | |
178 | .clk(rx_clk), | |
179 | .reset(rx_reset), | |
180 | .qout(xrlm_state)); | |
181 | ||
182 | endmodule // xrlm_sm | |
183 | ||
184 |