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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: srfifo_load.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 | /*%W% %G%*/ | |
36 | ||
37 | /************************************************************************* | |
38 | * | |
39 | * File Name : srfifo_load | |
40 | * Author Name : John Lo | |
41 | * Description : | |
42 | * Parent Module: rx_xmac | |
43 | * Child Module: | |
44 | * Interface Mod: | |
45 | * Date Created : 5/9/00 | |
46 | * | |
47 | * Copyright (c) 2002, Sun Microsystems, Inc. | |
48 | * Sun Proprietary and Confidential | |
49 | * | |
50 | * Modification : | |
51 | * | |
52 | * Synthesis Notes: | |
53 | * | |
54 | *************************************************************************/ | |
55 | ||
56 | `include "xmac.h" | |
57 | ||
58 | module srfifo_load ( | |
59 | rx_clk, | |
60 | rx_reset, | |
61 | srfifo_wr_en, // .srfifo_wr_en(eop) in rx_xmac.v | |
62 | srfifo_rd_ptr_clk, | |
63 | srfifo_din, | |
64 | // outputs | |
65 | srfifo_dout, | |
66 | srfifo_g_wr_ptr_rxclk | |
67 | ); | |
68 | ||
69 | ||
70 | input rx_clk; | |
71 | input rx_reset; | |
72 | input srfifo_wr_en; // .srfifo_wr_en(eop) in rx_xmac.v | |
73 | // vlint flag_input_port_not_connected off | |
74 | input [4:0] srfifo_rd_ptr_clk; | |
75 | // vlint flag_input_port_not_connected on | |
76 | input [`TBITS] srfifo_din; // 24 bits wide | |
77 | output [`TBITS] srfifo_dout; | |
78 | output [4:0] srfifo_g_wr_ptr_rxclk; | |
79 | ||
80 | wire [4:0] srfifo_g_wr_ptr_rxclk; | |
81 | // vlint flag_dangling_net_within_module off | |
82 | // vlint flag_net_has_no_load off | |
83 | // vlint flag_input_port_not_connected off | |
84 | wire [4:0] srfifo_wr_ptr_rxclk; | |
85 | wire [4:0] srfifo_rd_ptr_clk; | |
86 | // vlint flag_input_port_not_connected on | |
87 | // vlint flag_net_has_no_load on | |
88 | // vlint flag_dangling_net_within_module on | |
89 | ||
90 | /* --------------- start srfifo pointer Management ------------------ */ | |
91 | ||
92 | // srfifo G Write Pointer, g_wr_ptr to sysclk | |
93 | g_cntr_5bit srfifo_g_wr_ptr_rxclk_g_cntr_5bit( | |
94 | .reset(rx_reset), | |
95 | .clk(rx_clk), | |
96 | .ce(srfifo_wr_en), | |
97 | .g_cnt(srfifo_g_wr_ptr_rxclk)); | |
98 | ||
99 | // srfifo Write Pointer | |
100 | g2b_5bit srfifo_g2b_5bit(.g_cnt(srfifo_g_wr_ptr_rxclk), | |
101 | .b_cnt(srfifo_wr_ptr_rxclk)); | |
102 | /* --------------- end of srfifo pointer Management ----------------- */ | |
103 | ||
104 | //*********************************************** | |
105 | //***** srfifo and associated control logic ***** | |
106 | //*********************************************** | |
107 | srfifo_TBITS_memory_model srfifo_TBITS_memory_model( | |
108 | .rx_clk(rx_clk), | |
109 | .reset(rx_reset), | |
110 | .wp(srfifo_wr_ptr_rxclk[3:0]), | |
111 | .rp(srfifo_rd_ptr_clk[3:0]), | |
112 | .we(srfifo_wr_en), | |
113 | .din(srfifo_din[`TBITS]), | |
114 | .dout(srfifo_dout[`TBITS])); | |
115 | ||
116 | endmodule // srfifo_load | |
117 | ||
118 | ||
119 | module srfifo_TBITS_memory_model (rx_clk,reset,wp,rp,we,din,dout); | |
120 | input rx_clk,reset; | |
121 | input [3:0] wp,rp; | |
122 | input we; | |
123 | input [`TBITS] din; | |
124 | output [`TBITS] dout; | |
125 | ||
126 | ||
127 | reg [`TBITS] srfifo_mem [0:15]; // 24 bit wide 16 deep | |
128 | ||
129 | always @ (posedge rx_clk) | |
130 | begin | |
131 | if (reset) | |
132 | begin | |
133 | srfifo_mem[0] <= 0; | |
134 | srfifo_mem[1] <= 0; | |
135 | srfifo_mem[2] <= 0; | |
136 | srfifo_mem[3] <= 0; | |
137 | srfifo_mem[4] <= 0; | |
138 | srfifo_mem[5] <= 0; | |
139 | srfifo_mem[6] <= 0; | |
140 | srfifo_mem[7] <= 0; | |
141 | srfifo_mem[8] <= 0; | |
142 | srfifo_mem[9] <= 0; | |
143 | srfifo_mem[10] <= 0; | |
144 | srfifo_mem[11] <= 0; | |
145 | srfifo_mem[12] <= 0; | |
146 | srfifo_mem[13] <= 0; | |
147 | srfifo_mem[14] <= 0; | |
148 | srfifo_mem[15] <= 0; | |
149 | end | |
150 | else | |
151 | begin | |
152 | case (we) // synopsys parallel_case full_case infer_mux | |
153 | 1'b1: srfifo_mem[wp] <= din; | |
154 | 1'b0: srfifo_mem[wp] <= srfifo_mem[wp]; | |
155 | endcase // case(we) | |
156 | end | |
157 | end // always @ (posedge rx_clk) | |
158 | ||
159 | assign dout = srfifo_mem[rp]; | |
160 | ||
161 | endmodule // srfifo_TBITS_memory_model | |
162 | ||
163 |