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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: dmu_ilu_eil_relgen.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_ilu_eil_relgen ( | |
36 | clk, | |
37 | rst_l, | |
38 | y2k_rel_rcd, | |
39 | y2k_rel_enq, | |
40 | rcd_is_pio_mwr, | |
41 | rcd_is_cpl_reg, | |
42 | pio_tag, | |
43 | data_start, | |
44 | data_done, | |
45 | n_y2k_buf_addr_cl, | |
46 | y2k_buf_addr, | |
47 | ||
48 | k2y_dou_dptr, | |
49 | k2y_dou_err, | |
50 | k2y_dou_vld, | |
51 | dou_sbd_vld_datafsm, | |
52 | dou_sbd_vld_rcdbldr, | |
53 | dou_sbd_err_rcdbldr, | |
54 | ||
55 | // debug signal | |
56 | cpl_cl_done); | |
57 | ||
58 | ||
59 | // synopsys sync_set_reset "rst_l" | |
60 | ||
61 | ||
62 | // >>>>>>>>>>>>>>>>>>>>>>>>> Port Declarations <<<<<<<<<<<<<<<<<<<<<<<<<<<<<< | |
63 | ||
64 | //------------------------------------------------------------------------ | |
65 | // Clock and Reset Signals | |
66 | //------------------------------------------------------------------------ | |
67 | input clk; // input clock | |
68 | input rst_l; // input reset | |
69 | ||
70 | //------------------------------------------------------------------------ | |
71 | // release interface to RMU | |
72 | //------------------------------------------------------------------------ | |
73 | output y2k_rel_enq; // enqueue for release rcd | |
74 | output [8:0] y2k_rel_rcd; // release rcd | |
75 | ||
76 | //------------------------------------------------------------------------ | |
77 | // DOU DMA Rd Cpl Buffer status rcd interface with CLU | |
78 | //------------------------------------------------------------------------ | |
79 | input [`FIRE_DLC_DOU_DPTR_WDTH-1:0] k2y_dou_dptr; | |
80 | input k2y_dou_err; | |
81 | input k2y_dou_vld; | |
82 | ||
83 | //------------------------------------------------------------------------ | |
84 | // internal signals | |
85 | //------------------------------------------------------------------------ | |
86 | input rcd_is_pio_mwr; // rcd is PIO MWr, from *_rcdbldr.v | |
87 | input rcd_is_cpl_reg; // rcd is cpl from rcdbldr | |
88 | input [3:0] pio_tag; // from *_rcdbldr.v | |
89 | input data_start; | |
90 | input data_done; // from *_datafsm.v | |
91 | input [6:2] n_y2k_buf_addr_cl; | |
92 | input [6:0] y2k_buf_addr; // from *_datafsm.v | |
93 | ||
94 | output dou_sbd_vld_datafsm; // dou cl avairable to pull to datafsm | |
95 | output dou_sbd_vld_rcdbldr; // dou cl avairable to rcdbldr | |
96 | output dou_sbd_err_rcdbldr; // dou cl error to rcdbldr | |
97 | ||
98 | //--------------------------------------------------------------------- | |
99 | // debug signals | |
100 | //--------------------------------------------------------------------- | |
101 | output cpl_cl_done; | |
102 | ||
103 | // >>>>>>>>>>>>>>>>>>>>>>>>> Data Type Declarations <<<<<<<<<<<<<<<<<<<<<<<<< | |
104 | ||
105 | // ~~~~~~~~~~~~~~~~~~~~~~~~~ REGISTER - FLOPS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
106 | ||
107 | reg [8:0] y2k_rel_rcd; | |
108 | reg y2k_rel_enq; | |
109 | ||
110 | reg [3:0] pio_tag_reg; | |
111 | reg rcd_is_pio_mwr_reg; | |
112 | reg data_done_reg; | |
113 | ||
114 | // scoreboard for dou dma rd cpl buffer status | |
115 | reg [`FIRE_DLC_DOU_DPTR_DPTH-1:0] sbd_vld_array; | |
116 | reg [`FIRE_DLC_DOU_DPTR_DPTH-1:0] sbd_err_array; | |
117 | ||
118 | reg [6:2] adv_y2k_buf_addr_cl; // advanced 1 from cacheline y2k_buf_addr | |
119 | ||
120 | // ~~~~~~~~~~~~~~~~~~~~~~~~~ REGISTER - NON-FLOPS ~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
121 | ||
122 | reg [`FIRE_DLC_DOU_DPTR_DPTH-1:0] sbd_vld_set; | |
123 | reg [`FIRE_DLC_DOU_DPTR_DPTH-1:0] sbd_vld_clr; | |
124 | ||
125 | // ~~~~~~~~~~~~~~~~~~~~~~~~~ NETS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
126 | ||
127 | wire [8:0] n_rel_rcd; | |
128 | wire n_rel_enq; | |
129 | wire cpl_cl_done; // when DOU read address over a cache line | |
130 | ||
131 | wire [`FIRE_DLC_DOU_DPTR_DPTH-1:0] n_sbd_vld_array; | |
132 | wire [`FIRE_DLC_DOU_DPTR_WDTH-1:0] sbd_rd_entry_datafsm; | |
133 | wire [`FIRE_DLC_DOU_DPTR_WDTH-1:0] sbd_rd_entry_rcdbldr; | |
134 | ||
135 | wire clr_sbd; | |
136 | ||
137 | wire [6:2] n_adv_y2k_buf_addr_cl; | |
138 | ||
139 | // >>>>>>>>>>>>>>>>>>>>>>>>> Zero In Checkers <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< | |
140 | ||
141 | /* 0in scoreboard -rx_id k2y_dou_dptr -rx k2y_dou_vld | |
142 | -tx_id y2k_buf_addr[6:2] -tx clr_sbd | |
143 | -max_ids 32 -max_count_per_id 1 */ | |
144 | ||
145 | // >>>>>>>>>>>>>>>>>>>>>>>>> RTL/Behavioral Model <<<<<<<<<<<<<<<<<<<<<<<<<<< | |
146 | ||
147 | //------------------------------------------------------------------------ | |
148 | // release records generation - | |
149 | // need to release a cache line whenever y2k_buf_addr[2] flips when it's in | |
150 | // the middle of processing a DMA CPL(D) rcd | |
151 | //------------------------------------------------------------------------ | |
152 | ||
153 | assign cpl_cl_done = (y2k_buf_addr[2] ^ n_y2k_buf_addr_cl[2]) & (~data_start); | |
154 | // N2- AT 12/17/04: assign n_rel_enq = (data_done_reg | cpl_cl_done) & (rcd_is_cpl_reg | rcd_is_pio_mwr_reg); | |
155 | ||
156 | // N2+ AT 12/17/04: The rel_enq signal is not generated properly in Fire. This | |
157 | // was not an issue since in Fire, PIO Wr's are 64B. However, | |
158 | // in N2, PIO Wr's are 8B only. | |
159 | // According to Fire MAS (sec. 8.4.8, pg 935), logically, | |
160 | // rel_enq = rls_pio_mwr | rls_dma_cpl | |
161 | // = (data_done & rcd_is_pio_mwr) | | |
162 | // ((data_done | y2k_buf_addr[2]_toggle) & rcd_is_cpl) | |
163 | // The way it was coded above causes an errorneous assertion | |
164 | // of rel_enq when (rls_is_pio_mwr & y2k_buf_addr[2]_toggle). | |
165 | ||
166 | assign n_rel_enq = ((data_done_reg | cpl_cl_done) & (rcd_is_cpl_reg)) | | |
167 | (data_done_reg & rcd_is_pio_mwr_reg); | |
168 | // END N2+ AT 12/17/04 | |
169 | ||
170 | assign n_rel_rcd = rcd_is_pio_mwr_reg ? {1'b0, 4'b0, pio_tag_reg[3:0]} : | |
171 | {1'b1, 3'b0, y2k_buf_addr[6:2]}; | |
172 | ||
173 | always @ (posedge clk) | |
174 | if (!rst_l) begin | |
175 | y2k_rel_enq <= 1'b0; | |
176 | end | |
177 | else begin | |
178 | y2k_rel_enq <= n_rel_enq; | |
179 | end | |
180 | ||
181 | always @ (posedge clk) | |
182 | if(~rst_l) begin | |
183 | y2k_rel_rcd <= {9{1'b0}}; | |
184 | data_done_reg <= {{1'b0}}; | |
185 | rcd_is_pio_mwr_reg <= {{1'b0}}; | |
186 | pio_tag_reg <= {{4'b0}}; | |
187 | end | |
188 | else begin | |
189 | y2k_rel_rcd <= n_rel_rcd; | |
190 | data_done_reg <= data_done; | |
191 | rcd_is_pio_mwr_reg <= rcd_is_pio_mwr; | |
192 | pio_tag_reg <= pio_tag; | |
193 | end | |
194 | ||
195 | //------------------------------------------------------------------------ | |
196 | // flop for advanced 1 cacheline address of y2k_buf_addr[6:2] | |
197 | //------------------------------------------------------------------------ | |
198 | assign n_adv_y2k_buf_addr_cl = n_y2k_buf_addr_cl + 1'b1; | |
199 | always @ (posedge clk) | |
200 | if(~rst_l) begin | |
201 | adv_y2k_buf_addr_cl <= {5{1'b0}}; | |
202 | end | |
203 | else begin | |
204 | adv_y2k_buf_addr_cl <= n_adv_y2k_buf_addr_cl; | |
205 | end | |
206 | ||
207 | //------------------------------------------------------------------------ | |
208 | // DOU dma rd cpl buffer status | |
209 | //------------------------------------------------------------------------ | |
210 | ||
211 | // sbd err | |
212 | always @ (posedge clk) | |
213 | if(~rst_l) begin | |
214 | sbd_err_array <= {`FIRE_DLC_DOU_DPTR_DPTH{1'b0}}; | |
215 | end | |
216 | else begin | |
217 | if (k2y_dou_vld) sbd_err_array[k2y_dou_dptr] <= k2y_dou_err; | |
218 | end | |
219 | ||
220 | // sbd vld | |
221 | always @ (posedge clk) | |
222 | if (!rst_l) begin | |
223 | sbd_vld_array <= {`FIRE_DLC_DOU_DPTR_DPTH{1'b0}}; | |
224 | end | |
225 | else begin | |
226 | sbd_vld_array <= n_sbd_vld_array; | |
227 | end | |
228 | ||
229 | // sbd vld set array | |
230 | always @ (k2y_dou_vld or k2y_dou_dptr) | |
231 | begin | |
232 | sbd_vld_set = {`FIRE_DLC_DOU_DPTR_DPTH{1'b0}}; | |
233 | sbd_vld_set[k2y_dou_dptr] = k2y_dou_vld; | |
234 | end | |
235 | ||
236 | // sbd vld clr array | |
237 | assign clr_sbd = (~rcd_is_pio_mwr_reg) & n_rel_enq; | |
238 | ||
239 | always @ (clr_sbd or y2k_buf_addr[6:2]) | |
240 | begin | |
241 | sbd_vld_clr = {`FIRE_DLC_DOU_DPTR_DPTH{1'b0}}; | |
242 | sbd_vld_clr[y2k_buf_addr[6:2]] = clr_sbd; | |
243 | end | |
244 | ||
245 | ||
246 | assign n_sbd_vld_array = (sbd_vld_array | sbd_vld_set) & (~sbd_vld_clr); | |
247 | ||
248 | // outputs | |
249 | assign sbd_rd_entry_datafsm = (&y2k_buf_addr[1:0]) ? adv_y2k_buf_addr_cl : | |
250 | y2k_buf_addr[6:2]; | |
251 | ||
252 | // for PIO MWr, data is in DOU no later than rcd is in ILU and the max. payld is a cacheline | |
253 | // thus, mux out 1'b1 of dou_sbd_vld_datafsm for PIO MWr. | |
254 | assign dou_sbd_vld_datafsm = rcd_is_pio_mwr ? 1'b1 : sbd_vld_array[sbd_rd_entry_datafsm]; | |
255 | ||
256 | ||
257 | assign sbd_rd_entry_rcdbldr = n_y2k_buf_addr_cl[6:2]; | |
258 | ||
259 | assign dou_sbd_vld_rcdbldr = sbd_vld_array[sbd_rd_entry_rcdbldr]; | |
260 | ||
261 | assign dou_sbd_err_rcdbldr = sbd_err_array[sbd_rd_entry_rcdbldr]; | |
262 | ||
263 | endmodule // dmu_ilu_eil_relgen | |
264 |