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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: dmu_common_ccc_dep.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 | module dmu_common_ccc_dep | |
36 | ( | |
37 | clk, | |
38 | rst_l, | |
39 | ||
40 | csr_ring_in, | |
41 | ||
42 | dep2cdp_data, | |
43 | ||
44 | dep2fsm_acc_vio, | |
45 | dep2fsm_done, | |
46 | dep2fsm_mapped, | |
47 | dep2fsm_valid | |
48 | ); | |
49 | ||
50 | // ---------------------------------------------------------------------------- | |
51 | // Parameters | |
52 | // ---------------------------------------------------------------------------- | |
53 | parameter IDLE = 2'b00, | |
54 | RDMS = 2'b01, | |
55 | RDLS = 2'b10, | |
56 | DONE = 2'b11; | |
57 | ||
58 | // ---------------------------------------------------------------------------- | |
59 | // Ports | |
60 | // ---------------------------------------------------------------------------- | |
61 | input clk; | |
62 | input rst_l; | |
63 | ||
64 | input [`FIRE_CSR_RING_BITS] csr_ring_in; | |
65 | ||
66 | output [`FIRE_CSR_DATA_BITS] dep2cdp_data; | |
67 | ||
68 | output dep2fsm_acc_vio; | |
69 | output dep2fsm_done; | |
70 | output dep2fsm_mapped; | |
71 | output dep2fsm_valid; | |
72 | ||
73 | // ---------------------------------------------------------------------------- | |
74 | // Variables | |
75 | // ---------------------------------------------------------------------------- | |
76 | wire [`FIRE_CSR_DATA_BITS] dep2cdp_data; | |
77 | reg dep2fsm_acc_vio, nxt_vio; | |
78 | reg dep2fsm_done, nxt_dne; | |
79 | reg dep2fsm_mapped, nxt_map; | |
80 | reg dep2fsm_valid, nxt_vld; | |
81 | ||
82 | reg [`FIRE_CSR_CMND_BITS] cmnd; | |
83 | reg [`FIRE_CSR_DATA_BITS] data; | |
84 | reg [1:0] state, nxt_state; | |
85 | reg [1:0] data_ld; | |
86 | reg cmnd_ld; | |
87 | ||
88 | // ---------------------------------------------------------------------------- | |
89 | // Zero In Checkers | |
90 | // ---------------------------------------------------------------------------- | |
91 | ||
92 | // ---------------------------------------------------------------------------- | |
93 | // Combinational | |
94 | // ---------------------------------------------------------------------------- | |
95 | // output data | |
96 | assign dep2cdp_data = data; | |
97 | ||
98 | // valid command | |
99 | wire vld_cmnd = |csr_ring_in[`FIRE_CSR_RING_CMND_BITS]; | |
100 | ||
101 | // next state | |
102 | always @ (state or vld_cmnd) begin | |
103 | case (state) // synopsys parallel_case | |
104 | IDLE : begin | |
105 | if (vld_cmnd) nxt_state = RDMS; | |
106 | else nxt_state = IDLE; | |
107 | end | |
108 | RDMS : nxt_state = RDLS; | |
109 | RDLS : nxt_state = IDLE; | |
110 | DONE : nxt_state = IDLE; | |
111 | endcase | |
112 | end | |
113 | ||
114 | // state outputs | |
115 | always @ (state or cmnd) begin | |
116 | cmnd_ld = 0; | |
117 | data_ld = 0; | |
118 | nxt_dne = 0; | |
119 | nxt_map = 0; | |
120 | nxt_vio = 0; | |
121 | nxt_vld = 0; | |
122 | case (state) // synopsys parallel_case | |
123 | IDLE : begin | |
124 | cmnd_ld = 1'b1; | |
125 | end | |
126 | RDMS : begin | |
127 | data_ld = 2'b10; | |
128 | end | |
129 | RDLS : begin | |
130 | data_ld = 2'b01; | |
131 | nxt_vld = 1'b1; | |
132 | case (cmnd) // synopsys parallel_case | |
133 | `FIRE_CSR_CMND_RRSP : begin | |
134 | nxt_dne = 1'b1; | |
135 | nxt_map = 1'b1; | |
136 | nxt_vio = 0; | |
137 | end | |
138 | `FIRE_CSR_CMND_WRSP : begin | |
139 | nxt_dne = 1'b1; | |
140 | nxt_map = 1'b1; | |
141 | nxt_vio = 0; | |
142 | end | |
143 | `FIRE_CSR_CMND_RERR : begin | |
144 | nxt_dne = 1'b1; | |
145 | nxt_map = 1'b1; | |
146 | nxt_vio = 1'b1; | |
147 | end | |
148 | `FIRE_CSR_CMND_WERR : begin | |
149 | nxt_dne = 1'b1; | |
150 | nxt_map = 1'b1; | |
151 | nxt_vio = 1'b1; | |
152 | end | |
153 | default : begin | |
154 | nxt_dne = 0; | |
155 | nxt_map = 0; | |
156 | nxt_vio = 0; | |
157 | end | |
158 | endcase | |
159 | end | |
160 | DONE : begin | |
161 | nxt_vld = 0; | |
162 | end | |
163 | endcase | |
164 | end | |
165 | ||
166 | // ---------------------------------------------------------------------------- | |
167 | // Sequential | |
168 | // ---------------------------------------------------------------------------- | |
169 | always @(posedge clk ) begin | |
170 | if (!rst_l) begin | |
171 | state <= IDLE; | |
172 | end | |
173 | else begin | |
174 | state <= nxt_state; | |
175 | end | |
176 | end | |
177 | ||
178 | always @(posedge clk ) begin | |
179 | dep2fsm_acc_vio <= nxt_vio; | |
180 | dep2fsm_done <= nxt_dne; | |
181 | dep2fsm_mapped <= nxt_map; | |
182 | dep2fsm_valid <= nxt_vld; | |
183 | end | |
184 | ||
185 | always @(posedge clk ) begin | |
186 | if (cmnd_ld) cmnd <= csr_ring_in[`FIRE_CSR_RING_CMND_BITS]; | |
187 | if (data_ld[1]) data[`FIRE_CSR_RDMS_BITS] <= csr_ring_in; | |
188 | if (data_ld[0]) data[`FIRE_CSR_RDLS_BITS] <= csr_ring_in; | |
189 | end | |
190 | ||
191 | endmodule // dmu_common_ccc_dep |