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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: niu_smx_sm_req_siiarb.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 | module niu_smx_sm_req_siiarb( | |
37 | /*AUTOARG*/ | |
38 | // Outputs | |
39 | wreq_cmdff_rd, wreq_pcmd_ff_rd, rdreq_cmdff_rd, xmitflag, rwflag, | |
40 | hdr_data, bypass, o_enq, b_enq, arb_cs, | |
41 | // Inputs | |
42 | clk, reset_l, wreq_cmdff_rdata, wreq_cmdff_empty, | |
43 | wreq_pcmd_ff_rdata, wreq_pcmd_ff_empty, rdreq_cmdff_rdata, | |
44 | rdreq_cmdff_empty, nxt_xmit, ocr_avail, bcr_avail, | |
45 | tid_valid_rdata_bus | |
46 | ); | |
47 | input clk; | |
48 | input reset_l; | |
49 | ||
50 | // wr cmdff if | |
51 | output wreq_cmdff_rd; | |
52 | input [65:0] wreq_cmdff_rdata; | |
53 | input wreq_cmdff_empty; // not use | |
54 | ||
55 | ||
56 | // wr pcmd ff if | |
57 | output wreq_pcmd_ff_rd; | |
58 | input [3:0] wreq_pcmd_ff_rdata; | |
59 | input wreq_pcmd_ff_empty; // use this as wr req empty status | |
60 | ||
61 | // rd cmdff if | |
62 | output rdreq_cmdff_rd; | |
63 | input [65:0] rdreq_cmdff_rdata; | |
64 | input rdreq_cmdff_empty; | |
65 | ||
66 | ||
67 | // siireq interface | |
68 | output xmitflag; | |
69 | output rwflag; // 0= rd, 1= wr | |
70 | output [128:0] hdr_data; // added 121405 [128] to invalidate rdreq | |
71 | output bypass; | |
72 | input nxt_xmit; | |
73 | ||
74 | // credit if | |
75 | input ocr_avail; | |
76 | input bcr_avail; | |
77 | output o_enq; | |
78 | output b_enq; | |
79 | ||
80 | ||
81 | output [1:0] arb_cs; | |
82 | ||
83 | // added 121405 | |
84 | input [63:0] tid_valid_rdata_bus; | |
85 | ||
86 | ||
87 | parameter arb_s0= 2'h0, | |
88 | arb_s1= 2'h1, | |
89 | arb_s2= 2'h2, | |
90 | arb_s3= 2'h3; | |
91 | ||
92 | // added 121405 - begin | |
93 | // wire [15:0] hdr_tag= rdreq_cmdff_rdata[`SMX_CMDFF_POS_ID]; | |
94 | // extract exact field to avoid vlint bus_notused warning | |
95 | wire [5:0] hdr_tid= rdreq_cmdff_rdata[56:51]; | |
96 | wire tag_is_valid_n= tid_valid_rdata_bus[hdr_tid]; | |
97 | // added 121405 - end | |
98 | ||
99 | wire rd_cmd_order= rdreq_cmdff_rdata[`SMX_CMDFF_POS_ORDER]; | |
100 | wire rcmd_is_order_n= (rd_cmd_order==`SMX_CMD_ORDER); | |
101 | wire rcmd_is_bypass_n= (rd_cmd_order==`SMX_CMD_BYPASS); | |
102 | wire rd_cr_avail_n= (rcmd_is_order_n & ocr_avail) | | |
103 | (rcmd_is_bypass_n & bcr_avail); | |
104 | wire rd_rdy_n= ~rdreq_cmdff_empty & rd_cr_avail_n; | |
105 | ||
106 | wire wr_cmd_order= wreq_cmdff_rdata[`SMX_CMDFF_POS_ORDER]; | |
107 | wire wcmd_is_order_n= (wr_cmd_order==`SMX_CMD_ORDER); | |
108 | wire wcmd_is_bypass_n= (wr_cmd_order==`SMX_CMD_BYPASS); | |
109 | wire wr_cr_avail_n= (wcmd_is_order_n & ocr_avail) | | |
110 | (wcmd_is_bypass_n & bcr_avail); | |
111 | wire wr_rdy_n= ~wreq_pcmd_ff_empty & wr_cr_avail_n; | |
112 | ||
113 | reg o_enq_n; | |
114 | wire o_enq= o_enq_n; | |
115 | reg b_enq_n; | |
116 | wire b_enq= b_enq_n; | |
117 | ||
118 | ||
119 | ||
120 | reg [1:0] arb_ns, arb_cs; | |
121 | reg wreq_cmdff_rd_n; | |
122 | reg wreq_pcmd_ff_rd_n; | |
123 | reg rdreq_cmdff_rd_n; | |
124 | reg set_xmitflag_n; | |
125 | reg rst_xmitflag_n; | |
126 | reg xmitflag; | |
127 | reg rwflag_n, rwflag; | |
128 | ||
129 | always @(/*AUTOSENSE*/`SMX_REQARB_RD or `SMX_REQARB_WR or arb_cs | |
130 | or nxt_xmit or rcmd_is_bypass_n or rcmd_is_order_n | |
131 | or rd_rdy_n or rwflag or tag_is_valid_n or wcmd_is_bypass_n | |
132 | or wcmd_is_order_n or wr_rdy_n) begin | |
133 | wreq_cmdff_rd_n= 1'b0; | |
134 | wreq_pcmd_ff_rd_n= 1'b0; | |
135 | rdreq_cmdff_rd_n= 1'b0; | |
136 | set_xmitflag_n= 1'b0; | |
137 | rst_xmitflag_n= 1'b0; | |
138 | rwflag_n= rwflag; // 0= rd, 1= wr | |
139 | o_enq_n= 1'b0; | |
140 | b_enq_n= 1'b0; | |
141 | arb_ns= arb_cs; | |
142 | case (arb_cs) | |
143 | arb_s0: begin // none chosen; rd first | |
144 | if(rd_rdy_n) begin | |
145 | arb_ns= arb_s1; | |
146 | rdreq_cmdff_rd_n= 1'b1; | |
147 | rwflag_n= `SMX_REQARB_RD; | |
148 | set_xmitflag_n= 1'b1; | |
149 | o_enq_n= rcmd_is_order_n & tag_is_valid_n; // q only if valid; (chg'd 121405) | |
150 | b_enq_n= rcmd_is_bypass_n & tag_is_valid_n; // this will be dropped in siireq interface | |
151 | end | |
152 | else begin | |
153 | if(wr_rdy_n) begin | |
154 | arb_ns= arb_s2; | |
155 | wreq_cmdff_rd_n= 1'b1; | |
156 | wreq_pcmd_ff_rd_n= 1'b1; | |
157 | rwflag_n= `SMX_REQARB_WR; | |
158 | set_xmitflag_n= 1'b1; | |
159 | o_enq_n= wcmd_is_order_n; | |
160 | b_enq_n= wcmd_is_bypass_n; | |
161 | end | |
162 | else arb_ns= arb_cs; // no req; do nothing | |
163 | end // !rd_rdy_n | |
164 | end | |
165 | arb_s1: begin // chosen, wait nxt_xmit, wr first | |
166 | if(nxt_xmit) begin | |
167 | if(wr_rdy_n) begin | |
168 | arb_ns= arb_s2; | |
169 | wreq_cmdff_rd_n= 1'b1; | |
170 | wreq_pcmd_ff_rd_n= 1'b1; | |
171 | rwflag_n= `SMX_REQARB_WR; | |
172 | set_xmitflag_n= 1'b1; | |
173 | o_enq_n= wcmd_is_order_n; | |
174 | b_enq_n= wcmd_is_bypass_n; | |
175 | end | |
176 | else begin | |
177 | if(rd_rdy_n) begin | |
178 | arb_ns= arb_s1; | |
179 | rdreq_cmdff_rd_n= 1'b1; | |
180 | rwflag_n= `SMX_REQARB_RD; | |
181 | set_xmitflag_n= 1'b1; | |
182 | o_enq_n= rcmd_is_order_n & tag_is_valid_n; | |
183 | b_enq_n= rcmd_is_bypass_n & tag_is_valid_n; | |
184 | end | |
185 | else begin // no req | |
186 | arb_ns= arb_s3; // wr still first | |
187 | rst_xmitflag_n= 1'b1; | |
188 | end // !rd_rdy_n | |
189 | end // !wr_rdy_n | |
190 | end // nxt_xmit | |
191 | end | |
192 | arb_s2: begin // chosen, wait nxt_xmit, rd first | |
193 | if(nxt_xmit) begin | |
194 | if(rd_rdy_n) begin | |
195 | arb_ns= arb_s1; | |
196 | rdreq_cmdff_rd_n= 1'b1; | |
197 | rwflag_n= `SMX_REQARB_RD; | |
198 | set_xmitflag_n= 1'b1; | |
199 | o_enq_n= rcmd_is_order_n & tag_is_valid_n; | |
200 | b_enq_n= rcmd_is_bypass_n & tag_is_valid_n; | |
201 | end | |
202 | else begin | |
203 | if(wr_rdy_n) begin | |
204 | arb_ns= arb_s2; | |
205 | wreq_cmdff_rd_n= 1'b1; | |
206 | wreq_pcmd_ff_rd_n= 1'b1; | |
207 | rwflag_n= `SMX_REQARB_WR; | |
208 | set_xmitflag_n= 1'b1; | |
209 | o_enq_n= wcmd_is_order_n; | |
210 | b_enq_n= wcmd_is_bypass_n; | |
211 | end | |
212 | else begin // no req | |
213 | arb_ns= arb_s0; // rd still first | |
214 | rst_xmitflag_n= 1'b1; | |
215 | end // !wr_rdy_n | |
216 | end // !rd_rdy_n | |
217 | end // nxt_xmit | |
218 | end | |
219 | arb_s3: begin // none chosen, wr first | |
220 | if(wr_rdy_n) begin | |
221 | arb_ns= arb_s2; | |
222 | wreq_cmdff_rd_n= 1'b1; | |
223 | wreq_pcmd_ff_rd_n= 1'b1; | |
224 | rwflag_n= `SMX_REQARB_WR; | |
225 | set_xmitflag_n= 1'b1; | |
226 | o_enq_n= wcmd_is_order_n; | |
227 | b_enq_n= wcmd_is_bypass_n; | |
228 | end | |
229 | else begin | |
230 | if(rd_rdy_n) begin | |
231 | arb_ns= arb_s1; | |
232 | rdreq_cmdff_rd_n= 1'b1; | |
233 | rwflag_n= `SMX_REQARB_RD; | |
234 | set_xmitflag_n= 1'b1; | |
235 | o_enq_n= rcmd_is_order_n & tag_is_valid_n; | |
236 | b_enq_n= rcmd_is_bypass_n & tag_is_valid_n; | |
237 | end | |
238 | else arb_ns= arb_cs; // no req; do nothing | |
239 | end // !wr_rdy_n | |
240 | end | |
241 | endcase | |
242 | end | |
243 | ||
244 | always @(posedge clk) begin | |
245 | if(!reset_l) begin | |
246 | arb_cs<= `SMX_PD arb_s0; | |
247 | xmitflag<= `SMX_PD 1'b0; | |
248 | rwflag<= `SMX_PD 1'b0; | |
249 | end | |
250 | else begin | |
251 | arb_cs<= `SMX_PD arb_ns; | |
252 | if(rst_xmitflag_n) xmitflag<= `SMX_PD 1'b0; | |
253 | else if(set_xmitflag_n) xmitflag<= `SMX_PD 1'b1; | |
254 | rwflag<= `SMX_PD rwflag_n; | |
255 | end | |
256 | end | |
257 | ||
258 | wire [127:0] wr_hdr_data_n= {wreq_cmdff_rdata[`SMX_CMDFF_POS_CMD], | |
259 | 39'h0, | |
260 | (wreq_cmdff_rdata[`SMX_CMDFF_POS_ERR] | | |
261 | {2'h0, |wreq_pcmd_ff_rdata}), // propagate error | |
262 | wreq_cmdff_rdata[`SMX_CMDFF_POS_ID], | |
263 | 24'h0, | |
264 | wreq_cmdff_rdata[`SMX_CMDFF_POS_ADDR]}; | |
265 | ||
266 | wire [127:0] rd_hdr_data_n= {rdreq_cmdff_rdata[`SMX_CMDFF_POS_CMD], | |
267 | 39'h0, | |
268 | rdreq_cmdff_rdata[`SMX_CMDFF_POS_ERR], | |
269 | rdreq_cmdff_rdata[`SMX_CMDFF_POS_ID], | |
270 | 24'h0, | |
271 | rdreq_cmdff_rdata[`SMX_CMDFF_POS_ADDR]}; | |
272 | reg [128:0] hdr_data; | |
273 | reg bypass; | |
274 | ||
275 | always @(posedge clk) begin | |
276 | if(set_xmitflag_n) begin | |
277 | hdr_data<= `SMX_PD (rwflag_n==`SMX_REQARB_WR)? {1'b1, wr_hdr_data_n} : {tag_is_valid_n, rd_hdr_data_n}; | |
278 | bypass<= `SMX_PD (rwflag_n==`SMX_REQARB_WR)? wcmd_is_bypass_n : rcmd_is_bypass_n; | |
279 | end | |
280 | end | |
281 | ||
282 | wire wreq_cmdff_rd= wreq_cmdff_rd_n; | |
283 | wire wreq_pcmd_ff_rd= wreq_pcmd_ff_rd_n; | |
284 | wire rdreq_cmdff_rd= rdreq_cmdff_rd_n; | |
285 | ||
286 | endmodule | |
287 | ||
288 |