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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: dmu_mmu_qcb_qmc.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_mmu_qcb_qmc | |
36 | ( | |
37 | clk, // clock | |
38 | rst_l, // reset | |
39 | csr2qcb_ds_a, // csr debug select a | |
40 | csr2qcb_ds_b, // csr debug select b | |
41 | irb2qcb_enq, // irb srm enqueue | |
42 | orb2qcb_full, // orb isr queue full | |
43 | tcb2qcb_hld, // tcb hold | |
44 | tcb2qcb_vld, // tcb valid bits | |
45 | qpc2qmc_vld, // qpc valid bits | |
46 | qrc2qmc_vld, // qrc valid bits | |
47 | qvc2qmc_vld, // qvc valid bits | |
48 | qcb2csr_dbg_a, // csr debug bus a | |
49 | qcb2csr_dbg_b, // csr debug bus b | |
50 | qcb2csr_paq, // csr physical address queue not empty | |
51 | qcb2csr_vaq, // csr virtual address queue not empty | |
52 | qcb2irb_full, // irb queue full | |
53 | qcb2orb_enq, // orb srm enqueue | |
54 | qcb2tcb_hld, // tcb hold | |
55 | qcb2tcb_vld, // tcb valid | |
56 | qmc2qpc_enq, // qpc enqueue | |
57 | qmc2qpc_deq, // qpc dequeue | |
58 | qmc2qrc_enq, // qrc enqueue | |
59 | qmc2qrc_deq, // qrc dequeue | |
60 | qmc2qvc_enq, // qvc enqueue | |
61 | qmc2qvc_deq // qvc dequeue | |
62 | ); | |
63 | ||
64 | // ---------------------------------------------------------------------------- | |
65 | // Ports | |
66 | // ---------------------------------------------------------------------------- | |
67 | input clk; | |
68 | input rst_l; | |
69 | ||
70 | input [`FIRE_DLC_MMU_CSR_DS_BITS] csr2qcb_ds_a; | |
71 | input [`FIRE_DLC_MMU_CSR_DS_BITS] csr2qcb_ds_b; | |
72 | input irb2qcb_enq; | |
73 | input orb2qcb_full; | |
74 | input tcb2qcb_hld; | |
75 | input [`FIRE_DLC_MMU_PLS_DPTH:1] tcb2qcb_vld; | |
76 | input [`FIRE_DLC_MMU_PAQ_DPTH-1:0] qpc2qmc_vld; | |
77 | input [`FIRE_DLC_MMU_RDQ_DPTH-1:0] qrc2qmc_vld; | |
78 | input [`FIRE_DLC_MMU_VAQ_DPTH-1:0] qvc2qmc_vld; | |
79 | ||
80 | output [`FIRE_DBG_DATA_BITS] qcb2csr_dbg_a; | |
81 | output [`FIRE_DBG_DATA_BITS] qcb2csr_dbg_b; | |
82 | output qcb2csr_paq; | |
83 | output qcb2csr_vaq; | |
84 | output qcb2irb_full; | |
85 | output qcb2orb_enq; | |
86 | output qcb2tcb_hld; | |
87 | output qcb2tcb_vld; | |
88 | output qmc2qpc_enq; | |
89 | output qmc2qpc_deq; | |
90 | output qmc2qrc_enq; | |
91 | output qmc2qrc_deq; | |
92 | output qmc2qvc_enq; | |
93 | output qmc2qvc_deq; | |
94 | ||
95 | // ---------------------------------------------------------------------------- | |
96 | // Variables | |
97 | // ---------------------------------------------------------------------------- | |
98 | wire [`FIRE_DBG_DATA_BITS] qcb2csr_dbg_a, qcb2csr_dbg_b; | |
99 | ||
100 | reg qcb2orb_enq; | |
101 | reg qcb2tcb_hld; | |
102 | reg deq, nxt_deq; | |
103 | ||
104 | reg [`FIRE_DLC_MMU_CSR_DS_BITS] dbg_sel [0:1]; | |
105 | reg [`FIRE_DBG_DATA_BITS] dbg_bus [0:1]; | |
106 | ||
107 | integer i; | |
108 | ||
109 | // ---------------------------------------------------------------------------- | |
110 | // Combinational | |
111 | // ---------------------------------------------------------------------------- | |
112 | wire qcb2csr_paq = qpc2qmc_vld[0]; | |
113 | wire qcb2csr_vaq = qvc2qmc_vld[0]; | |
114 | ||
115 | wire vaq_full = qvc2qmc_vld[`FIRE_DLC_MMU_VAQ_DPTH-2]; | |
116 | wire rdq_full = qrc2qmc_vld[`FIRE_DLC_MMU_RDQ_DPTH-2]; | |
117 | ||
118 | wire qcb2irb_full = vaq_full | rdq_full; | |
119 | ||
120 | wire enq = tcb2qcb_vld[`FIRE_DLC_MMU_PLS_DPTH]; | |
121 | ||
122 | always @ (orb2qcb_full or qpc2qmc_vld or enq or deq) begin | |
123 | case ({enq, deq}) // synopsys parallel_case | |
124 | 2'b00 : nxt_deq = qpc2qmc_vld[0] & ~orb2qcb_full; | |
125 | 2'b01 : nxt_deq = qpc2qmc_vld[1] & ~orb2qcb_full; | |
126 | 2'b10 : nxt_deq = ~orb2qcb_full; | |
127 | 2'b11 : nxt_deq = ~orb2qcb_full; | |
128 | endcase | |
129 | end | |
130 | ||
131 | always @ (orb2qcb_full or tcb2qcb_vld or qpc2qmc_vld ) begin | |
132 | if (!orb2qcb_full) begin | |
133 | qcb2tcb_hld = 1'b0; | |
134 | end | |
135 | else begin | |
136 | case (tcb2qcb_vld) // synopsys parallel_case | |
137 | 3'b000 : qcb2tcb_hld = 1'b0; | |
138 | 3'b001 : qcb2tcb_hld = qpc2qmc_vld[3]; | |
139 | 3'b010 : qcb2tcb_hld = qpc2qmc_vld[3]; | |
140 | 3'b011 : qcb2tcb_hld = qpc2qmc_vld[2]; | |
141 | 3'b100 : qcb2tcb_hld = qpc2qmc_vld[3]; | |
142 | 3'b101 : qcb2tcb_hld = qpc2qmc_vld[2]; | |
143 | 3'b110 : qcb2tcb_hld = qpc2qmc_vld[2]; | |
144 | 3'b111 : qcb2tcb_hld = qpc2qmc_vld[1]; | |
145 | endcase | |
146 | end | |
147 | end | |
148 | ||
149 | wire qcb2tcb_vld = qvc2qmc_vld[0]; | |
150 | ||
151 | wire qmc2qpc_enq = enq; | |
152 | ||
153 | wire qmc2qrc_enq = irb2qcb_enq; | |
154 | wire qmc2qvc_enq = irb2qcb_enq; | |
155 | ||
156 | wire qmc2qpc_deq = deq; | |
157 | wire qmc2qrc_deq = deq; | |
158 | ||
159 | wire qmc2qvc_deq = qvc2qmc_vld[0] & ~tcb2qcb_hld; | |
160 | ||
161 | // ---------------------------------------------------------------------------- | |
162 | // Debug | |
163 | // ---------------------------------------------------------------------------- | |
164 | always @ (csr2qcb_ds_a or csr2qcb_ds_b) begin | |
165 | dbg_sel[0] = csr2qcb_ds_a; | |
166 | dbg_sel[1] = csr2qcb_ds_b; | |
167 | end | |
168 | ||
169 | assign qcb2csr_dbg_a = dbg_bus[0]; | |
170 | assign qcb2csr_dbg_b = dbg_bus[1]; | |
171 | ||
172 | // ---------------------------------------------------------------------------- | |
173 | // Sequential | |
174 | // ---------------------------------------------------------------------------- | |
175 | always @ (posedge clk) begin | |
176 | if (!rst_l) begin | |
177 | qcb2orb_enq <= 0; | |
178 | deq <= 0; | |
179 | end | |
180 | else begin | |
181 | qcb2orb_enq <= nxt_deq; | |
182 | deq <= nxt_deq; | |
183 | end | |
184 | end | |
185 | ||
186 | always @ (posedge clk) | |
187 | if(~rst_l) begin : dbg_rst | |
188 | integer j; | |
189 | for (j = 0; j < 2; j = j + 1) begin | |
190 | dbg_bus[j] <= 8'h00; | |
191 | end | |
192 | end | |
193 | else begin | |
194 | for (i = 0; i < 2; i = i + 1) begin | |
195 | case (dbg_sel[i]) // synopsys infer_mux | |
196 | 3'b000: dbg_bus[i] <= { qpc2qmc_vld, qvc2qmc_vld }; | |
197 | 3'b001: dbg_bus[i] <= qrc2qmc_vld; | |
198 | 3'b010: dbg_bus[i] <= 8'h00; | |
199 | 3'b011: dbg_bus[i] <= 8'h00; | |
200 | 3'b100: dbg_bus[i] <= 8'h00; | |
201 | 3'b101: dbg_bus[i] <= 8'h00; | |
202 | 3'b110: dbg_bus[i] <= 8'h00; | |
203 | 3'b111: dbg_bus[i] <= 8'h00; | |
204 | endcase | |
205 | end | |
206 | end | |
207 | ||
208 | endmodule // dmu_mmu_qcb_qmc |