Commit | Line | Data |
---|---|---|
86530b38 AT |
1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: ncu_io_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_io_chkr( | |
36 | iol2clk, | |
37 | ncu_io_vld, // From c2i of c2i.v | |
38 | ncu_io_data, // From c2i of c2i.v | |
39 | io_ncu_data, // To i2c of i2c.v | |
40 | io_ncu_vld, // To i2c of i2c.v | |
41 | io_ncu_stall, // To c2i of c2i.v | |
42 | ncu_io_stall // From i2c of i2c.v | |
43 | ||
44 | ); | |
45 | ||
46 | input iol2clk; | |
47 | ||
48 | input ncu_io_vld; // From c2i of c2i.v | |
49 | input [3:0] ncu_io_data; // From c2i of c2i.v | |
50 | input io_ncu_stall; // To c2i of c2i.v | |
51 | ||
52 | input [3:0] io_ncu_data; // To i2c of i2c.v | |
53 | input io_ncu_vld; // To i2c of i2c.v | |
54 | input ncu_io_stall; // From i2c of i2c.v | |
55 | ||
56 | wire por_reset_l = ~`NCU.tcu_aclk; | |
57 | ||
58 | // 0in set_clock -default iol2clk -module ncu_io_chkr | |
59 | // 0in default_reset `NCU.tcu_aclk -module ncu_io_chkr | |
60 | ||
61 | `ifdef X_GUARD | |
62 | // 0in known_driven -var ncu_io_stall -name ncu_io_stall_x_guard -active por_reset_l | |
63 | // 0in known_driven -var io_ncu_vld -name io_ncu_vld_x_guard -active por_reset_l | |
64 | // 0in known_driven -var io_ncu_stall -name io_ncu_stall_x_guard -active por_reset_l | |
65 | // 0in known_driven -var ncu_io_vld -name ncu_io_vld_x_guard -active por_reset_l | |
66 | `endif | |
67 | ||
68 | //********************************* | |
69 | // make sure vald and stall do not active to long | |
70 | //********************************* | |
71 | ||
72 | reg [9:0] io_ncu_vld_cnt; | |
73 | reg [9:0] io_ncu_stall_cnt; | |
74 | reg [9:0] ncu_io_vld_cnt; | |
75 | reg [9:0] ncu_io_stall_cnt; | |
76 | ||
77 | /* 0in range | |
78 | -var io_ncu_vld_cnt | |
79 | -min 0 | |
80 | -max 32 | |
81 | */ | |
82 | ||
83 | /* 0in range | |
84 | -var io_ncu_stall_cnt | |
85 | -min 0 | |
86 | -max 1000 | |
87 | */ | |
88 | ||
89 | /* 0in range | |
90 | -var ncu_io_vld_cnt | |
91 | -min 0 | |
92 | -max 32 | |
93 | */ | |
94 | ||
95 | /* 0in range | |
96 | -var ncu_io_stall_cnt | |
97 | -min 0 | |
98 | -max 1000 | |
99 | ||
100 | */ | |
101 | ||
102 | reg ncu_io_stall_del; | |
103 | reg io_ncu_stall_del; | |
104 | ||
105 | always @(posedge iol2clk) begin | |
106 | if (io_ncu_vld && !ncu_io_stall_del) begin | |
107 | io_ncu_vld_cnt = io_ncu_vld_cnt + 1; | |
108 | end | |
109 | else if (!io_ncu_vld) begin | |
110 | io_ncu_vld_cnt = 0; | |
111 | end | |
112 | ||
113 | if (io_ncu_stall_del) begin | |
114 | io_ncu_stall_cnt = io_ncu_stall_cnt + 1; | |
115 | end else begin | |
116 | io_ncu_stall_cnt = 0; | |
117 | end | |
118 | ||
119 | ||
120 | if (ncu_io_vld && !io_ncu_stall_del) begin | |
121 | ncu_io_vld_cnt = ncu_io_vld_cnt + 1; | |
122 | end | |
123 | else if (!ncu_io_vld) begin | |
124 | ncu_io_vld_cnt = 0; | |
125 | end | |
126 | ||
127 | if (ncu_io_stall_del) begin | |
128 | ncu_io_stall_cnt = ncu_io_stall_cnt + 1; | |
129 | end | |
130 | else begin | |
131 | ncu_io_stall_cnt = 0; | |
132 | end | |
133 | ||
134 | ncu_io_stall_del <= ncu_io_stall; | |
135 | io_ncu_stall_del <= io_ncu_stall; | |
136 | end | |
137 | ||
138 | ||
139 | ||
140 | endmodule |