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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: dmu_clu_ctm_datapipe.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_clu_ctm_datapipe | |
36 | ( | |
37 | // clock | |
38 | clk, | |
39 | rst_l, | |
40 | ||
41 | // jbc : dmc req/resp data port | |
42 | d2j_data, | |
43 | d2j_bmsk, | |
44 | d2j_data_par, | |
45 | ||
46 | // diu : data read port | |
47 | di2cl_data, | |
48 | di2cl_bmask, | |
49 | di2cl_dpar, | |
50 | ||
51 | // datapath select | |
52 | dpath_sel, | |
53 | ld_diu_data, | |
54 | //BP n2 4-28-04 | |
55 | proc_pio_err | |
56 | ); | |
57 | ||
58 | // >>>>>>>>>>>>>>>>>>>>>>>>> Port Declarations <<<<<<<<<<<<<<<<<<<<<<<<<<<<<< | |
59 | ||
60 | // -------------------------------------------------------- | |
61 | // Clock Signal | |
62 | // -------------------------------------------------------- | |
63 | ||
64 | input clk; | |
65 | input rst_l; | |
66 | ||
67 | // -------------------------------------------------------- | |
68 | // JBC Interface | |
69 | // -------------------------------------------------------- | |
70 | ||
71 | // Data Port -> DMC Req/Resp | |
72 | output [(`FIRE_D2J_DATA_WDTH - 1):0] d2j_data; | |
73 | output [(`FIRE_D2J_BMSK_WDTH - 1):0] d2j_bmsk; | |
74 | output [(`FIRE_D2J_DPAR_WDTH - 1):0] d2j_data_par; | |
75 | ||
76 | // -------------------------------------------------------- | |
77 | // DIU Interface | |
78 | // -------------------------------------------------------- | |
79 | ||
80 | // Data Buffer Read Port | |
81 | input [(`FIRE_DLC_CRD_DATA_WDTH - 1):0] di2cl_data; | |
82 | input [(`FIRE_DLC_CRD_BMASK_WDTH - 1):0] di2cl_bmask; | |
83 | input [(`FIRE_DLC_CRD_DPAR_WDTH - 1):0] di2cl_dpar; | |
84 | ||
85 | // -------------------------------------------------------- | |
86 | // Datapath Select | |
87 | // -------------------------------------------------------- | |
88 | ||
89 | input dpath_sel; | |
90 | input ld_diu_data; | |
91 | ||
92 | input proc_pio_err; // force 0 data on pio err cpl | |
93 | // >>>>>>>>>>>>>>>>>>>>>>>>> Data Type Declarations <<<<<<<<<<<<<<<<<<<<<<<<< | |
94 | ||
95 | // ~~~~~~~~~~~~~~~~~~~~~~~~~ REGISTERS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
96 | ||
97 | // ********** Flops ********** | |
98 | ||
99 | reg [(`FIRE_D2J_DATA_WDTH - 1):0] d2j_data; | |
100 | reg [(`FIRE_D2J_BMSK_WDTH - 1):0] d2j_bmsk; | |
101 | reg [(`FIRE_D2J_DPAR_WDTH - 1):0] d2j_data_par; | |
102 | ||
103 | // ********** Non-Flops ****** | |
104 | ||
105 | reg [(`FIRE_D2J_DATA_WDTH - 1):0] nxt_d2j_data; | |
106 | reg [(`FIRE_D2J_BMSK_WDTH - 1):0] nxt_d2j_bmask; | |
107 | reg [(`FIRE_D2J_DPAR_WDTH - 1):0] nxt_d2j_dpar; | |
108 | ||
109 | // >>>>>>>>>>>>>>>>>>>>>>>>> RTL Model <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< | |
110 | ||
111 | // -------------------------------------------------------- | |
112 | // Datapath Mux Select (DIU/Zero-fill) | |
113 | // -------------------------------------------------------- | |
114 | ||
115 | always @(dpath_sel or di2cl_data or di2cl_bmask or di2cl_dpar or proc_pio_err) | |
116 | begin | |
117 | ||
118 | case ((dpath_sel || proc_pio_err)) // synopsys infer_mux | |
119 | ||
120 | // DIU datapath | |
121 | 1'b0 : | |
122 | begin | |
123 | nxt_d2j_data = di2cl_data; | |
124 | nxt_d2j_bmask = di2cl_bmask; | |
125 | nxt_d2j_dpar = di2cl_dpar; | |
126 | end | |
127 | ||
128 | // Zero-fill datapath | |
129 | 1'b1 : | |
130 | begin | |
131 | nxt_d2j_data = {`FIRE_D2J_DATA_WDTH{1'b0}}; | |
132 | nxt_d2j_bmask = {`FIRE_D2J_BMSK_WDTH{1'b1}}; | |
133 | nxt_d2j_dpar = {`FIRE_D2J_DPAR_WDTH{1'b1}}; | |
134 | end | |
135 | ||
136 | endcase | |
137 | end | |
138 | ||
139 | // -------------------------------------------------------- | |
140 | // Sequential Logic : datapath regs | |
141 | // -------------------------------------------------------- | |
142 | ||
143 | always @(posedge clk) | |
144 | if (~rst_l) begin | |
145 | d2j_data <= {`FIRE_D2J_DATA_WDTH{1'b0}}; | |
146 | d2j_bmsk <= {`FIRE_D2J_BMSK_WDTH{1'b0}}; | |
147 | d2j_data_par <= {`FIRE_D2J_DPAR_WDTH{1'b0}}; | |
148 | end | |
149 | else begin | |
150 | if ((ld_diu_data || proc_pio_err)) | |
151 | begin | |
152 | d2j_data <= nxt_d2j_data; | |
153 | d2j_bmsk <= nxt_d2j_bmask; | |
154 | d2j_data_par <= nxt_d2j_dpar; | |
155 | end | |
156 | end | |
157 | ||
158 | endmodule // dmu_clu_ctm_datapipe |