| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: niu_pio_fifo16d.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 : niu_pio_fifo16d.v |
| 40 | * Author Name : John Lo |
| 41 | * Description : This is a 16 deep, 112 bit wide FIFO. |
| 42 | * Parent Module: niu |
| 43 | * Child Module: |
| 44 | * Interface Mod: many. |
| 45 | * Date Created : 3/29/2004 |
| 46 | * |
| 47 | * Copyright (c) 2020, Sun Microsystems, Inc. |
| 48 | * Sun Proprietary and Confidential |
| 49 | * |
| 50 | * Modification : |
| 51 | * |
| 52 | * Synthesis Notes: |
| 53 | * |
| 54 | *************************************************************************/ |
| 55 | `include "niu_pio.h" |
| 56 | |
| 57 | module niu_pio_fifo16d( |
| 58 | clk, |
| 59 | reset, |
| 60 | rd, |
| 61 | wr, |
| 62 | din, |
| 63 | dout, |
| 64 | pio_peu_afull, |
| 65 | full, |
| 66 | empty, |
| 67 | rd_ptr, |
| 68 | wr_ptr |
| 69 | ); |
| 70 | |
| 71 | /* 0in fifo |
| 72 | -enq wr |
| 73 | -deq rd |
| 74 | -depth 16 |
| 75 | -value -enq_data din -deq_data dout |
| 76 | -clock clk |
| 77 | -reset reset |
| 78 | -message "0in-ERROR : niu_pio FIFO 16d failed" |
| 79 | */ |
| 80 | |
| 81 | input clk; |
| 82 | input reset; |
| 83 | input rd; |
| 84 | input wr; |
| 85 | input [`PIO_FIFO_W_R] din; |
| 86 | output [`PIO_FIFO_W_R] dout; |
| 87 | output pio_peu_afull; |
| 88 | output full; |
| 89 | output empty; |
| 90 | output [`PIO_FIFO_PTR] rd_ptr; |
| 91 | output [`PIO_FIFO_PTR] wr_ptr; |
| 92 | |
| 93 | wire ld0; |
| 94 | wire ld1; |
| 95 | wire ld2; |
| 96 | wire ld3; |
| 97 | wire ld4; |
| 98 | wire ld5; |
| 99 | wire ld6; |
| 100 | wire ld7; |
| 101 | wire ld8; |
| 102 | wire ld9; |
| 103 | wire lda; |
| 104 | wire ldb; |
| 105 | wire ldc; |
| 106 | wire ldd; |
| 107 | wire lde; |
| 108 | wire ldf; |
| 109 | wire [`PIO_FIFO_W_R] word0; |
| 110 | wire [`PIO_FIFO_W_R] word1; |
| 111 | wire [`PIO_FIFO_W_R] word2; |
| 112 | wire [`PIO_FIFO_W_R] word3; |
| 113 | wire [`PIO_FIFO_W_R] word4; |
| 114 | wire [`PIO_FIFO_W_R] word5; |
| 115 | wire [`PIO_FIFO_W_R] word6; |
| 116 | wire [`PIO_FIFO_W_R] word7; |
| 117 | wire [`PIO_FIFO_W_R] word8; |
| 118 | wire [`PIO_FIFO_W_R] word9; |
| 119 | wire [`PIO_FIFO_W_R] worda; |
| 120 | wire [`PIO_FIFO_W_R] wordb; |
| 121 | wire [`PIO_FIFO_W_R] wordc; |
| 122 | wire [`PIO_FIFO_W_R] wordd; |
| 123 | wire [`PIO_FIFO_W_R] worde; |
| 124 | wire [`PIO_FIFO_W_R] wordf; |
| 125 | wire [`PIO_FIFO_PTR] rd_ptr; |
| 126 | wire [`PIO_FIFO_PTR] wr_ptr; |
| 127 | wire [`PIO_FIFO_W_R] din; |
| 128 | reg [`PIO_FIFO_W_R] dout; |
| 129 | |
| 130 | wire full = (rd_ptr[`PIO_FIFO_A_R] == wr_ptr[`PIO_FIFO_A_R]) & (rd_ptr[`PIO_FIFO_A]!=wr_ptr[`PIO_FIFO_A]); |
| 131 | |
| 132 | wire empty = (rd_ptr[`PIO_FIFO_PTR] == wr_ptr[`PIO_FIFO_PTR]); |
| 133 | |
| 134 | wire [`PIO_FIFO_PTR] empty_space = |
| 135 | (wr_ptr[`PIO_FIFO_A] == rd_ptr[`PIO_FIFO_A]) ? |
| 136 | `PIO_FIFO_D - ({1'b0,wr_ptr[`PIO_FIFO_A_R]} - {1'b0,rd_ptr[`PIO_FIFO_A_R]}): |
| 137 | ({1'b0,rd_ptr[`PIO_FIFO_A_R]} - {1'b0,wr_ptr[`PIO_FIFO_A_R]}) ; |
| 138 | |
| 139 | wire afull = empty_space < 5'd2; |
| 140 | reg pio_peu_afull; |
| 141 | |
| 142 | always @ (posedge clk) |
| 143 | begin |
| 144 | if (reset) |
| 145 | pio_peu_afull <= 1'b0; |
| 146 | else |
| 147 | pio_peu_afull <= afull; |
| 148 | end |
| 149 | |
| 150 | wire wr_en = ~full & wr; |
| 151 | wire rd_en = ~empty & rd; |
| 152 | |
| 153 | wire [`PIO_FIFO_PTR] wr_ptr_in = wr_en ? wr_ptr + 1 : wr_ptr; |
| 154 | wire [`PIO_FIFO_PTR] rd_ptr_in = rd_en ? rd_ptr + 1 : rd_ptr; |
| 155 | dffr #(5) wr_ptr_dffr(.d(wr_ptr_in),.reset(reset),.clk(clk),.q(wr_ptr)); |
| 156 | dffr #(5) rd_ptr_dffr(.d(rd_ptr_in),.reset(reset),.clk(clk),.q(rd_ptr)); |
| 157 | |
| 158 | assign ld0 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h0) & wr_en); |
| 159 | assign ld1 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h1) & wr_en); |
| 160 | assign ld2 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h2) & wr_en); |
| 161 | assign ld3 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h3) & wr_en); |
| 162 | assign ld4 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h4) & wr_en); |
| 163 | assign ld5 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h5) & wr_en); |
| 164 | assign ld6 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h6) & wr_en); |
| 165 | assign ld7 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h7) & wr_en); |
| 166 | assign ld8 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h8) & wr_en); |
| 167 | assign ld9 = ((wr_ptr[`PIO_FIFO_A_R] == 4'h9) & wr_en); |
| 168 | assign lda = ((wr_ptr[`PIO_FIFO_A_R] == 4'ha) & wr_en); |
| 169 | assign ldb = ((wr_ptr[`PIO_FIFO_A_R] == 4'hb) & wr_en); |
| 170 | assign ldc = ((wr_ptr[`PIO_FIFO_A_R] == 4'hc) & wr_en); |
| 171 | assign ldd = ((wr_ptr[`PIO_FIFO_A_R] == 4'hd) & wr_en); |
| 172 | assign lde = ((wr_ptr[`PIO_FIFO_A_R] == 4'he) & wr_en); |
| 173 | assign ldf = ((wr_ptr[`PIO_FIFO_A_R] == 4'hf) & wr_en); |
| 174 | |
| 175 | dffre #(`PIO_FIFO_W) word0_dffr(.d(din),.reset(reset),.en(ld0),.clk(clk),.q(word0)); |
| 176 | dffre #(`PIO_FIFO_W) word1_dffr(.d(din),.reset(reset),.en(ld1),.clk(clk),.q(word1)); |
| 177 | dffre #(`PIO_FIFO_W) word2_dffr(.d(din),.reset(reset),.en(ld2),.clk(clk),.q(word2)); |
| 178 | dffre #(`PIO_FIFO_W) word3_dffr(.d(din),.reset(reset),.en(ld3),.clk(clk),.q(word3)); |
| 179 | dffre #(`PIO_FIFO_W) word4_dffr(.d(din),.reset(reset),.en(ld4),.clk(clk),.q(word4)); |
| 180 | dffre #(`PIO_FIFO_W) word5_dffr(.d(din),.reset(reset),.en(ld5),.clk(clk),.q(word5)); |
| 181 | dffre #(`PIO_FIFO_W) word6_dffr(.d(din),.reset(reset),.en(ld6),.clk(clk),.q(word6)); |
| 182 | dffre #(`PIO_FIFO_W) word7_dffr(.d(din),.reset(reset),.en(ld7),.clk(clk),.q(word7)); |
| 183 | dffre #(`PIO_FIFO_W) word8_dffr(.d(din),.reset(reset),.en(ld8),.clk(clk),.q(word8)); |
| 184 | dffre #(`PIO_FIFO_W) word9_dffr(.d(din),.reset(reset),.en(ld9),.clk(clk),.q(word9)); |
| 185 | dffre #(`PIO_FIFO_W) worda_dffr(.d(din),.reset(reset),.en(lda),.clk(clk),.q(worda)); |
| 186 | dffre #(`PIO_FIFO_W) wordb_dffr(.d(din),.reset(reset),.en(ldb),.clk(clk),.q(wordb)); |
| 187 | dffre #(`PIO_FIFO_W) wordc_dffr(.d(din),.reset(reset),.en(ldc),.clk(clk),.q(wordc)); |
| 188 | dffre #(`PIO_FIFO_W) wordd_dffr(.d(din),.reset(reset),.en(ldd),.clk(clk),.q(wordd)); |
| 189 | dffre #(`PIO_FIFO_W) worde_dffr(.d(din),.reset(reset),.en(lde),.clk(clk),.q(worde)); |
| 190 | dffre #(`PIO_FIFO_W) wordf_dffr(.d(din),.reset(reset),.en(ldf),.clk(clk),.q(wordf)); |
| 191 | |
| 192 | // read decoder |
| 193 | always @(/*AUTOSENSE*/rd_ptr or word0 or word1 or word2 or word3 |
| 194 | or word4 or word5 or word6 or word7 or word8 or word9 |
| 195 | or worda or wordb or wordc or wordd or worde or wordf) |
| 196 | begin |
| 197 | case (rd_ptr[`PIO_FIFO_A_R]) |
| 198 | 4'h0: dout = word0; |
| 199 | 4'h1: dout = word1; |
| 200 | 4'h2: dout = word2; |
| 201 | 4'h3: dout = word3; |
| 202 | 4'h4: dout = word4; |
| 203 | 4'h5: dout = word5; |
| 204 | 4'h6: dout = word6; |
| 205 | 4'h7: dout = word7; |
| 206 | 4'h8: dout = word8; |
| 207 | 4'h9: dout = word9; |
| 208 | 4'ha: dout = worda; |
| 209 | 4'hb: dout = wordb; |
| 210 | 4'hc: dout = wordc; |
| 211 | 4'hd: dout = wordd; |
| 212 | 4'he: dout = worde; |
| 213 | 4'hf: dout = wordf; |
| 214 | default: dout = {69'b0,32'hdead_beef}; |
| 215 | endcase |
| 216 | end |
| 217 | |
| 218 | endmodule // niu_pio_fifo16d |
| 219 | |
| 220 | |
| 221 | |