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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: niu_scam_ctl.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 | ||
36 | /********************************************************** | |
37 | *********************************************************** | |
38 | ||
39 | Project : Niu | |
40 | ||
41 | File name : niu_scam_ctl.v | |
42 | ||
43 | Module(s) name : niu_scam_ctl | |
44 | ||
45 | Parent modules : niu_scam.v | |
46 | ||
47 | Child modules : | |
48 | ||
49 | Author's name : George Chu | |
50 | ||
51 | Date : April. 2004 | |
52 | ||
53 | Description : | |
54 | ||
55 | Synthesis Notes: | |
56 | ||
57 | Modification History: | |
58 | Date Description | |
59 | ---- ----------- | |
60 | ||
61 | ************************************************************ | |
62 | ***********************************************************/ | |
63 | ||
64 | `timescale 1ns/10ps | |
65 | ||
66 | `include "niu_scam.h" | |
67 | ||
68 | module niu_scam_ctl ( | |
69 | cam_compare_d, | |
70 | pio_wt_d, | |
71 | pio_rd_d, | |
72 | pio_sel_d, | |
73 | reset, | |
74 | cam_clk, | |
75 | cmp_enc, | |
76 | cmp_busy, | |
77 | cam_valid, | |
78 | clr_cam, | |
79 | c_scam_st, | |
80 | wt_data, | |
81 | wt_mask, | |
82 | rd_data, | |
83 | rd_mask, | |
84 | pio_rd_vld, | |
85 | c_pio_rw_st | |
86 | ); | |
87 | ||
88 | input cam_compare_d; // initiate compare operation | |
89 | input pio_wt_d; | |
90 | input pio_rd_d; | |
91 | input pio_sel_d; | |
92 | input reset; | |
93 | input cam_clk; | |
94 | output cmp_enc; | |
95 | output cmp_busy; | |
96 | output cam_valid; | |
97 | output clr_cam; | |
98 | output c_scam_st; | |
99 | output wt_data; | |
100 | output wt_mask; | |
101 | output rd_data; | |
102 | output rd_mask; | |
103 | output pio_rd_vld; | |
104 | output c_pio_rw_st; | |
105 | ||
106 | /**********************************************************/ | |
107 | reg /*geo*/ cmp_enc; | |
108 | reg cmp_busy; | |
109 | reg cam_valid; | |
110 | reg clr_cam; | |
111 | reg c_scam_st; | |
112 | ||
113 | wire wt_data; | |
114 | wire wt_mask; | |
115 | wire rd_data; | |
116 | wire rd_mask; | |
117 | reg pio_rd_vld; | |
118 | reg c_pio_rw_st; | |
119 | ||
120 | /*--------------------------------------------------------*/ | |
121 | reg inc_cyc_cnt; | |
122 | reg n_cmp_busy; | |
123 | reg n_cam_valid; | |
124 | reg n_clr_scam; | |
125 | ||
126 | reg n_scam_st; | |
127 | ||
128 | wire [2:0] pio_cam_cyc_1 = 3'h2; // geo, real 3-1=2 | |
129 | wire [2:0] pio_cam_cyc_2 = 3'h1; // geo, real 3-2=1 | |
130 | ||
131 | wire [2:0] cyc_cnt; | |
132 | ||
133 | wire n_cmp_enc = (cyc_cnt==pio_cam_cyc_2[2:0]) && (c_scam_st==`NIU_SCAM_CMP); | |
134 | ||
135 | /*--------------------------------------------------------*/ | |
136 | reg n_catch_pio_rd; | |
137 | reg catch_pio_rd; | |
138 | ||
139 | reg n_pio_rw_st; | |
140 | ||
141 | /**********************************************************/ | |
142 | always @(cam_compare_d or | |
143 | cyc_cnt or | |
144 | pio_cam_cyc_1 or | |
145 | cmp_busy or | |
146 | c_scam_st | |
147 | ) begin | |
148 | ||
149 | inc_cyc_cnt = 1'h0; | |
150 | n_cam_valid = 1'h0; | |
151 | n_clr_scam = 1'h0; | |
152 | n_scam_st = `NIU_SCAM_IDL; | |
153 | ||
154 | n_cmp_busy = cmp_busy; | |
155 | ||
156 | case (c_scam_st) //synopsys parallel_case | |
157 | (`NIU_SCAM_IDL): | |
158 | begin | |
159 | if (cam_compare_d) begin | |
160 | inc_cyc_cnt = 1'h1; | |
161 | n_cmp_busy = 1'h1; | |
162 | n_scam_st = `NIU_SCAM_CMP; | |
163 | end | |
164 | else begin | |
165 | n_cmp_busy = 1'h0; | |
166 | n_scam_st = `NIU_SCAM_IDL; | |
167 | end | |
168 | end | |
169 | (`NIU_SCAM_CMP): | |
170 | begin | |
171 | if (cyc_cnt>=pio_cam_cyc_1) begin | |
172 | n_cmp_busy = 1'h0; | |
173 | n_cam_valid = 1'h1; | |
174 | n_clr_scam = 1'h1; | |
175 | n_scam_st = `NIU_SCAM_IDL; | |
176 | end | |
177 | else begin | |
178 | inc_cyc_cnt = 1'h1; | |
179 | n_scam_st = `NIU_SCAM_CMP; | |
180 | end | |
181 | end | |
182 | default: | |
183 | begin | |
184 | n_cmp_busy = 1'h0; | |
185 | n_cam_valid = 1'h1; | |
186 | n_clr_scam = 1'h1; | |
187 | n_scam_st = `NIU_SCAM_IDL; | |
188 | end | |
189 | endcase | |
190 | end | |
191 | ||
192 | niu_scam_cnt_i_r_3 cam_cnt_i_r_3_0(.incr(inc_cyc_cnt), .rs(clr_cam), .ck(cam_clk), .qo(cyc_cnt[2:0])); | |
193 | ||
194 | /**********************************************************/ | |
195 | always @(pio_wt_d or pio_rd_d or | |
196 | c_pio_rw_st | |
197 | ) begin | |
198 | ||
199 | n_catch_pio_rd = 1'h0; | |
200 | n_pio_rw_st = `NIU_SCAM_PIO_IDL; | |
201 | ||
202 | case (c_pio_rw_st) //synopsys parallel_case | |
203 | (`NIU_SCAM_PIO_IDL): | |
204 | begin | |
205 | if (pio_wt_d || pio_rd_d) begin | |
206 | n_catch_pio_rd = pio_rd_d; | |
207 | n_pio_rw_st = `NIU_SCAM_PIO_OUT; | |
208 | end | |
209 | else begin | |
210 | n_catch_pio_rd = 1'h0; | |
211 | n_pio_rw_st = `NIU_SCAM_PIO_IDL; | |
212 | end | |
213 | end | |
214 | (`NIU_SCAM_PIO_OUT): | |
215 | begin | |
216 | n_catch_pio_rd = 1'h0; | |
217 | n_pio_rw_st = `NIU_SCAM_PIO_IDL; | |
218 | end | |
219 | default: | |
220 | begin | |
221 | n_catch_pio_rd = 1'h0; | |
222 | n_pio_rw_st = `NIU_SCAM_PIO_IDL; | |
223 | end | |
224 | endcase | |
225 | end | |
226 | ||
227 | assign wt_data = pio_wt_d && !pio_sel_d && (c_pio_rw_st==`NIU_SCAM_PIO_IDL) && !cmp_busy; | |
228 | assign wt_mask = pio_wt_d && pio_sel_d && (c_pio_rw_st==`NIU_SCAM_PIO_IDL) && !cmp_busy; | |
229 | assign rd_data = pio_rd_d && !pio_sel_d && (c_pio_rw_st==`NIU_SCAM_PIO_IDL); | |
230 | assign rd_mask = pio_rd_d && pio_sel_d && (c_pio_rw_st==`NIU_SCAM_PIO_IDL); | |
231 | ||
232 | /**********************************************************/ | |
233 | ||
234 | always @(posedge cam_clk) | |
235 | if (reset) | |
236 | begin | |
237 | /*geo*/ cmp_enc <= #1 (1'h0); | |
238 | cmp_busy <= #1 (1'h0); | |
239 | cam_valid <= #1 (1'h0); | |
240 | clr_cam <= #1 (1'h1); | |
241 | c_scam_st <= #1 (1'h0); | |
242 | ||
243 | catch_pio_rd <= #1 (1'h0); | |
244 | pio_rd_vld <= #1 (1'h0); | |
245 | c_pio_rw_st <= #1 (`NIU_SCAM_PIO_IDL); | |
246 | end | |
247 | else | |
248 | begin | |
249 | /*geo*/ cmp_enc <= #1 (n_cmp_enc); | |
250 | cmp_busy <= #1 (n_cmp_busy); | |
251 | cam_valid <= #1 (n_cam_valid); | |
252 | clr_cam <= #1 (n_clr_scam); | |
253 | c_scam_st <= #1 (n_scam_st); | |
254 | ||
255 | catch_pio_rd <= #1 (n_catch_pio_rd); | |
256 | pio_rd_vld <= #1 (catch_pio_rd); | |
257 | c_pio_rw_st <= #1 (n_pio_rw_st); | |
258 | end | |
259 | ||
260 | endmodule |