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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: niu_pio_ucb_out32.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 | //////////////////////////////////////////////////////////////////////////////// | |
36 | // | |
37 | // | |
38 | // Copyright (C) 2003 by Sun Microsystems, Inc. | |
39 | // | |
40 | // All rights reserved. No part of this design may be reproduced, | |
41 | // stored in a retrieval system, or transmitted, in any form or by | |
42 | // any means, electronic, mechanical, photocopying, recording, or | |
43 | // otherwise, without prior written permission of Sun Microsystems, | |
44 | // Inc. | |
45 | // | |
46 | // Sun Proprietary/Confidential | |
47 | // | |
48 | // | |
49 | // Primary Contact: Jimmy.Lau@sun.com x48745 | |
50 | // Description: This interface is modified based on Niagra ucb_bus_in. | |
51 | // Instaniated by UCB modules and NCU to receive | |
52 | // packets on the UCB bus. This module supports 32 bit | |
53 | // data bus in. | |
54 | // | |
55 | // Revision: 1. March 08, 2004 - John Lo | |
56 | // Changed modules name from | |
57 | // ucb_bus_out32_niu.v to niu_pio_ucb_out32 | |
58 | // | |
59 | // Changed enl2clk to clk. | |
60 | // | |
61 | // | |
62 | //////////////////////////////////////////////////////////////////////////////// | |
63 | ||
64 | ||
65 | module niu_pio_ucb_out32 ( | |
66 | // Global // | |
67 | clk, | |
68 | reset, | |
69 | // UCB bus // | |
70 | vld, | |
71 | data, | |
72 | stall, | |
73 | // Local unit // | |
74 | outdata_buf_busy, | |
75 | outdata_buf_wr, | |
76 | outdata_buf_in, | |
77 | outdata_vec_in ); | |
78 | ||
79 | ||
80 | // Globals | |
81 | input clk; | |
82 | input reset; | |
83 | ||
84 | // UCB bus interface | |
85 | output vld; | |
86 | output [31:0] data; | |
87 | input stall; | |
88 | ||
89 | // Local interface | |
90 | output outdata_buf_busy; | |
91 | input outdata_buf_wr; | |
92 | input [127:0] outdata_buf_in; | |
93 | input [3:0] outdata_vec_in; | |
94 | ||
95 | ||
96 | ||
97 | // Local signals | |
98 | wire stall_d1; | |
99 | wire [3:0] outdata_vec; | |
100 | wire [3:0] outdata_vec_next; | |
101 | wire [127:0] outdata_buf; | |
102 | wire [127:0] outdata_buf_next; | |
103 | wire load_outdata; | |
104 | wire shift_outdata; | |
105 | ||
106 | ||
107 | //////////////////////////////////////////////////////////////////////// | |
108 | // Code starts here | |
109 | //////////////////////////////////////////////////////////////////////// | |
110 | /************************************************************ | |
111 | * UCB bus interface flops | |
112 | ************************************************************/ | |
113 | assign vld = outdata_vec[0]; | |
114 | assign data[31:0] = outdata_buf[31:0]; | |
115 | ||
116 | dffr #(1) stall_d1_ff (.d(stall), | |
117 | .clk(clk), | |
118 | .reset(reset), | |
119 | .q(stall_d1) ); | |
120 | ||
121 | ||
122 | /************************************************************ | |
123 | * Outbound Data | |
124 | ************************************************************/ | |
125 | // accept new data only if there is none being processed | |
126 | assign load_outdata = outdata_buf_wr & ~outdata_buf_busy; | |
127 | ||
128 | assign outdata_buf_busy = outdata_vec[0] | stall_d1; | |
129 | ||
130 | assign shift_outdata = outdata_vec[0] & ~stall_d1; | |
131 | ||
132 | assign outdata_vec_next[3:0] = load_outdata ? outdata_vec_in[3:0]: | |
133 | shift_outdata ? (outdata_vec[3:0] >> 1) : | |
134 | outdata_vec[3:0]; | |
135 | ||
136 | dffr #(4) outdata_vec_ff (.d(outdata_vec_next[3:0]), | |
137 | .clk(clk), | |
138 | .reset(reset), | |
139 | .q(outdata_vec[3:0]) ); | |
140 | ||
141 | assign outdata_buf_next[127:0] = load_outdata ? outdata_buf_in[127:0]: | |
142 | shift_outdata ? (outdata_buf[127:0] >> 32): | |
143 | outdata_buf[127:0]; | |
144 | df1 #(96) outdata_buf_msw_ff (.d(outdata_buf_next[127:32]), | |
145 | .clk(clk), | |
146 | .q(outdata_buf[127:32]) ); | |
147 | ||
148 | dffr #(32) outdata_buf_lsw_ff (.d(outdata_buf_next[31:0]), | |
149 | .clk(clk), | |
150 | .reset(reset), | |
151 | .q(outdata_buf[31:0]) ); | |
152 | ||
153 | ||
154 | endmodule // niu_pio_ucb_out32 | |
155 | ||
156 | ||
157 | ||
158 | ||
159 | ||
160 | ||
161 |