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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: l2_dir.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 | `timescale 1 ns / 10 ps | |
36 | module l2_dir(clk, reset, pa_in, index, pa_wr, val, way_hit, dir_hit_way_enc, | |
37 | rd_en); | |
38 | ||
39 | input clk; | |
40 | input reset; | |
41 | input rd_en; | |
42 | input val; | |
43 | input [27:0] pa_in; | |
44 | input [3:0] pa_wr; | |
45 | input [6:0] index; | |
46 | output [3:0] way_hit; | |
47 | output [1:0] dir_hit_way_enc; | |
48 | ||
49 | reg [27:0] dta_way0[127:0]; | |
50 | reg [27:0] dta_way1[127:0]; | |
51 | reg [27:0] dta_way2[127:0]; | |
52 | reg [27:0] dta_way3[127:0]; | |
53 | ||
54 | reg [127:0] valid_w0; | |
55 | reg [127:0] valid_w1; | |
56 | reg [127:0] valid_w2; | |
57 | reg [127:0] valid_w3; | |
58 | wire [3:0] wr_way_d = pa_wr; | |
59 | reg [3:0] way_hit_r; | |
60 | wire [6:0] index_y_d = index; | |
61 | wire [27:0] wrtag_y = pa_in; | |
62 | reg [3:0] squash; | |
63 | reg mult; | |
64 | reg dbg_en; | |
65 | reg dbg_en2; | |
66 | reg [3:0] wr_way_d_d; | |
67 | reg [3:0] wr_way_d_d_d; | |
68 | ||
69 | assign dir_hit_way_enc = (way_hit[0] ? 0 : (way_hit[1] ? 1 : (way_hit[2] | |
70 | ? 2 : 3))); | |
71 | assign way_hit = way_hit_r; | |
72 | ||
73 | always @(posedge clk) begin | |
74 | if (reset) begin | |
75 | valid_w0 <= 0; | |
76 | valid_w1 <= 0; | |
77 | valid_w2 <= 0; | |
78 | valid_w3 <= 0; | |
79 | end | |
80 | else | |
81 | begin | |
82 | if (wr_way_d[0] | squash[0]) begin | |
83 | valid_w0[index_y_d] <= (val & (~squash[0])); | |
84 | end | |
85 | if (wr_way_d[1] | squash[1]) begin | |
86 | valid_w1[index_y_d] <= (val & (~squash[1])); | |
87 | end | |
88 | if (wr_way_d[2] | squash[2]) begin | |
89 | valid_w2[index_y_d] <= (val & (~squash[2])); | |
90 | end | |
91 | if (wr_way_d[3] | squash[3]) begin | |
92 | valid_w3[index_y_d] <= (val & (~squash[3])); | |
93 | end | |
94 | end | |
95 | end | |
96 | always @(posedge clk) begin | |
97 | wr_way_d_d <= wr_way_d; | |
98 | wr_way_d_d_d <= wr_way_d_d; | |
99 | if ((((way_hit_r[0] + way_hit_r[1]) + way_hit_r[2]) + way_hit_r[3]) > | |
100 | 1) begin | |
101 | mult <= 1; | |
102 | end | |
103 | else | |
104 | begin | |
105 | mult <= 0; | |
106 | end | |
107 | if (((((way_hit_r[0] + way_hit_r[1]) + way_hit_r[2]) + way_hit_r[3]) > | |
108 | 1) & (|wr_way_d_d_d)) begin | |
109 | squash <= (way_hit_r & (~wr_way_d_d_d)); | |
110 | end | |
111 | else | |
112 | begin | |
113 | squash <= 4'b0; | |
114 | end | |
115 | way_hit_r <= {((dta_way3[index_y_d[6:0]] == pa_in) & | |
116 | valid_w3[index_y_d]), ((dta_way2[index_y_d[6:0]] == pa_in) & | |
117 | valid_w2[index_y_d]), ((dta_way1[index_y_d[6:0]] == pa_in) & | |
118 | valid_w1[index_y_d]), ((dta_way0[index_y_d[6:0]] == pa_in) & | |
119 | valid_w0[index_y_d])}; | |
120 | if (wr_way_d[0]) begin | |
121 | dta_way0[index_y_d[6:0]] <= wrtag_y; | |
122 | end | |
123 | if (wr_way_d[1]) begin | |
124 | dta_way1[index_y_d[6:0]] <= wrtag_y; | |
125 | end | |
126 | if (wr_way_d[2]) begin | |
127 | dta_way2[index_y_d[6:0]] <= wrtag_y; | |
128 | end | |
129 | if (wr_way_d[3]) begin | |
130 | dta_way3[index_y_d[6:0]] <= wrtag_y; | |
131 | end | |
132 | end | |
133 | endmodule |