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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: ncu_niu_chkr.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 ncu_niu_chkr( | |
36 | iol2clk, | |
37 | ncu_niu_vld, // From c2i of c2i.v | |
38 | ncu_niu_data, // From c2i of c2i.v | |
39 | niu_ncu_data, // To i2c of i2c.v | |
40 | niu_ncu_vld, // To i2c of i2c.v | |
41 | niu_ncu_stall, // To c2i of c2i.v | |
42 | ncu_niu_stall // From i2c of i2c.v | |
43 | ); | |
44 | ||
45 | input iol2clk; | |
46 | ||
47 | input ncu_niu_vld; // From c2i of c2i.v | |
48 | input [31:0] ncu_niu_data; // From c2i of c2i.v | |
49 | input niu_ncu_stall; // To c2i of c2i.v | |
50 | ||
51 | input [31:0] niu_ncu_data; // To i2c of i2c.v | |
52 | input niu_ncu_vld; // To i2c of i2c.v | |
53 | input ncu_niu_stall; // From i2c of i2c.v | |
54 | ||
55 | wire por_reset_l = !`NCU.tcu_aclk; | |
56 | ||
57 | // 0in set_clock -default iol2clk -module ncu_niu_chkr | |
58 | // 0in default_reset `NCU.tcu_aclk -module ncu_niu_chkr | |
59 | `ifdef X_GUARD | |
60 | // 0in known_driven -var ncu_niu_stall -name ncu_niu_stall_x_guard -active por_reset_l | |
61 | // 0in known_driven -var niu_ncu_vld -name niu_ncu_vld_x_guard -active por_reset_l | |
62 | // 0in known_driven -var niu_ncu_stall -name niu_ncu_stall_x_guard -active por_reset_l | |
63 | // 0in known_driven -var ncu_niu_vld -name ncu_niu_vld_x_guard -active por_reset_l | |
64 | `endif | |
65 | ||
66 | ||
67 | //********************************* | |
68 | // make sure vald and stall do not active to long | |
69 | //********************************* | |
70 | ||
71 | reg [9:0] niu_ncu_vld_cnt; | |
72 | reg [9:0] niu_ncu_stall_cnt; | |
73 | reg [9:0] ncu_niu_vld_cnt; | |
74 | reg [9:0] ncu_niu_stall_cnt; | |
75 | ||
76 | /* 0in range | |
77 | -var niu_ncu_vld_cnt | |
78 | -min 0 | |
79 | -max 4 | |
80 | */ | |
81 | ||
82 | /* 0in range | |
83 | -var niu_ncu_stall_cnt | |
84 | -min 0 | |
85 | -max 1000 | |
86 | */ | |
87 | ||
88 | /* 0in range | |
89 | -var ncu_niu_vld_cnt | |
90 | -min 0 | |
91 | -max 4 | |
92 | */ | |
93 | ||
94 | /* 0in range | |
95 | -var ncu_niu_stall_cnt | |
96 | -min 0 | |
97 | -max 1000 | |
98 | ||
99 | */ | |
100 | ||
101 | reg ncu_niu_stall_del; | |
102 | reg niu_ncu_stall_del; | |
103 | ||
104 | always @(posedge iol2clk) begin | |
105 | if (niu_ncu_vld && !ncu_niu_stall_del) begin | |
106 | niu_ncu_vld_cnt = niu_ncu_vld_cnt + 1; | |
107 | end | |
108 | else if (!niu_ncu_vld) begin | |
109 | niu_ncu_vld_cnt = 0; | |
110 | end | |
111 | ||
112 | if (niu_ncu_stall_del) begin | |
113 | niu_ncu_stall_cnt = niu_ncu_stall_cnt + 1; | |
114 | end else begin | |
115 | niu_ncu_stall_cnt = 0; | |
116 | end | |
117 | ||
118 | ||
119 | if (ncu_niu_vld && !niu_ncu_stall_del) begin | |
120 | ncu_niu_vld_cnt = ncu_niu_vld_cnt + 1; | |
121 | end | |
122 | else if (!ncu_niu_vld) begin | |
123 | ncu_niu_vld_cnt = 0; | |
124 | end | |
125 | ||
126 | if (ncu_niu_stall_del) begin | |
127 | ncu_niu_stall_cnt = ncu_niu_stall_cnt + 1; | |
128 | end | |
129 | else begin | |
130 | ncu_niu_stall_cnt = 0; | |
131 | end | |
132 | ||
133 | ncu_niu_stall_del = ncu_niu_stall; | |
134 | niu_ncu_stall_del = niu_ncu_stall; | |
135 | end | |
136 | ||
137 | ||
138 | ||
139 | endmodule |