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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: dmu_imu_rds_mondo.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_imu_rds_mondo ( | |
36 | ||
37 | // Clock and Reset | |
38 | ||
39 | clk, | |
40 | rst_l, | |
41 | ||
42 | // Static ID for IMU for Mondo's | |
43 | ||
44 | j2d_jid, | |
45 | j2d_instance_id, | |
46 | ||
47 | // Pipeline Input Select | |
48 | ||
49 | pipe_select_in, | |
50 | ||
51 | // Pipeline Output Select and Outputs | |
52 | ||
53 | pipe_select_out, | |
54 | mondo_d_ptr, | |
55 | mondo_jid | |
56 | ||
57 | ); | |
58 | ||
59 | ||
60 | //############################################################################ | |
61 | // PORT DECLARATIONS | |
62 | //############################################################################ | |
63 | ||
64 | //------------------------------------------------------------------------ | |
65 | // Clock and Reset Signals | |
66 | //------------------------------------------------------------------------ | |
67 | input clk; | |
68 | input rst_l; | |
69 | ||
70 | ||
71 | //------------------------------------------------------------------------ | |
72 | // Static ID for IMU for Mondo's | |
73 | //------------------------------------------------------------------------ | |
74 | input [`FIRE_J2D_JID_WDTH-1:0] j2d_jid; | |
75 | input [`FIRE_J2D_INSTANCE_ID_WDTH-1:0] j2d_instance_id; | |
76 | ||
77 | ||
78 | //------------------------------------------------------------------------ | |
79 | // Pipeline Input Select | |
80 | //------------------------------------------------------------------------ | |
81 | input pipe_select_in; | |
82 | ||
83 | //------------------------------------------------------------------------ | |
84 | // Pipeline Output Select and Outputs | |
85 | //------------------------------------------------------------------------ | |
86 | output pipe_select_out; | |
87 | output [3:0] mondo_d_ptr; | |
88 | output [4:0] mondo_jid; | |
89 | ||
90 | ||
91 | ||
92 | ||
93 | //############################################################################ | |
94 | // PARAMETERS | |
95 | //############################################################################ | |
96 | ||
97 | parameter MONDO_FIRST_DPTR = 4'b1100; | |
98 | parameter MONDO_LAST_DPTR = 4'b1111; | |
99 | ||
100 | ||
101 | ||
102 | ||
103 | //############################################################################ | |
104 | // SIGNAL DECLARATIONS | |
105 | //############################################################################ | |
106 | ||
107 | ||
108 | //************************************************** | |
109 | // Wire | |
110 | //************************************************** | |
111 | ||
112 | //************************************************** | |
113 | // Registers that Are Not Flops | |
114 | //************************************************** | |
115 | reg [4:0] jid; | |
116 | ||
117 | ||
118 | //************************************************** | |
119 | // Registers that Are Flops | |
120 | //************************************************** | |
121 | reg pipe_select_out; | |
122 | reg [3:0] mondo_d_ptr; | |
123 | reg [4:0] mondo_jid; | |
124 | reg [3:0] dptr; | |
125 | ||
126 | //############################################################################ | |
127 | // ZERO IN CHECKERS | |
128 | //############################################################################ | |
129 | //--------------------------------------------------------------------- | |
130 | // Range Checkers | |
131 | //--------------------------------------------------------------------- | |
132 | ||
133 | //0in range -var dptr -min MONDO_FIRST_DPTR -max MONDO_LAST_DPTR | |
134 | //0in range -var jid -min 5'h1c -max 5'h1f | |
135 | ||
136 | ||
137 | ||
138 | //############################################################################ | |
139 | // COMBINATIONAL LOGIC | |
140 | //############################################################################ | |
141 | ||
142 | //-------------------------------------------------------------------------- | |
143 | // Use the ID from the JBC Core to select which ID to use for the Mondo | |
144 | //-------------------------------------------------------------------------- | |
145 | ||
146 | always @(j2d_jid or j2d_instance_id) | |
147 | begin | |
148 | case ({j2d_jid,j2d_instance_id}) // synopsys parallel_case full_case infer_mux | |
149 | 2'b00: jid = 5'h1c; | |
150 | 2'b01: jid = 5'h1d; | |
151 | 2'b10: jid = 5'h1e; | |
152 | 2'b11: jid = 5'h1f; | |
153 | endcase | |
154 | end | |
155 | ||
156 | ||
157 | //############################################################################ | |
158 | // SEQUENTIAL LOGIC | |
159 | //############################################################################ | |
160 | ||
161 | //-------------------------------------------------------------------------- | |
162 | // ALLOCATION of the DPTR for the MSI DIU RAM | |
163 | // | |
164 | // - The RAM is 1K with 64 rows and holds 16 cachelines of data | |
165 | // - Space is alloctaed on cachline boundry | |
166 | // - 16 lines is 4 bits | |
167 | // - C-F are dedicated to the Mondo (1100-1111) | |
168 | // - Also need three other bits | |
169 | // - upper 2 MSB are to identify ram type in DIU | |
170 | // - 00 TLP | |
171 | // - 01 PIO | |
172 | // - 10 MSI/Mondo RAM | |
173 | // - 1 extra bit to unify the read address space as TLP is 2K | |
174 | // | |
175 | // | |
176 | // - Reset the value to the first RAM location | |
177 | // | |
178 | // - If new requests comes in advance the dptr in cicular fashion | |
179 | // - If no new request hold the value. | |
180 | // | |
181 | //-------------------------------------------------------------------------- | |
182 | ||
183 | always @ (posedge clk) | |
184 | if (!rst_l) | |
185 | dptr <= MONDO_FIRST_DPTR; | |
186 | else if (pipe_select_in) | |
187 | begin | |
188 | if(dptr == MONDO_LAST_DPTR) | |
189 | dptr <= MONDO_FIRST_DPTR; | |
190 | else | |
191 | dptr <= dptr + 1; | |
192 | end | |
193 | else | |
194 | dptr <= dptr; | |
195 | ||
196 | //-------------------------------------------------------------------------- | |
197 | // FLOP THE OUTPUTS | |
198 | // | |
199 | //-------------------------------------------------------------------------- | |
200 | ||
201 | always @ (posedge clk) | |
202 | if (!rst_l) | |
203 | begin // At reset reset all of them to zero. | |
204 | pipe_select_out <= 1'b0; | |
205 | mondo_jid <= 5'h0; | |
206 | mondo_d_ptr <= 4'h0; | |
207 | end | |
208 | else | |
209 | begin | |
210 | pipe_select_out <= pipe_select_in; | |
211 | mondo_jid <= jid; | |
212 | mondo_d_ptr <= dptr; | |
213 | end | |
214 | ||
215 | ||
216 | ||
217 | //############################################################################ | |
218 | // MODULE INSTANTIATIONS | |
219 | //############################################################################ | |
220 | ||
221 | ||
222 | endmodule |