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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 668 | lvd | 1 | // ZX-Evo Base Configuration (c) NedoPC 2008,2009,2010,2011,2012,2013,2014 |
| 272 | lvd | 2 | // |
| 3 | // top module for video output. |
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| 668 | lvd | 4 | |
| 5 | /* |
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| 6 | This file is part of ZX-Evo Base Configuration firmware. |
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| 7 | |||
| 8 | ZX-Evo Base Configuration firmware is free software: |
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| 9 | you can redistribute it and/or modify it under the terms of |
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| 10 | the GNU General Public License as published by |
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| 11 | the Free Software Foundation, either version 3 of the License, or |
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| 12 | (at your option) any later version. |
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| 13 | |||
| 14 | ZX-Evo Base Configuration firmware is distributed in the hope that |
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| 15 | it will be useful, but WITHOUT ANY WARRANTY; without even |
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| 16 | the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 17 | See the GNU General Public License for more details. |
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| 18 | |||
| 19 | You should have received a copy of the GNU General Public License |
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| 20 | along with ZX-Evo Base Configuration firmware. |
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| 21 | If not, see <http://www.gnu.org/licenses/>. |
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| 22 | */ |
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| 23 | |||
| 24 | |||
| 25 | |||
| 318 | lvd | 26 | // note: the only bandwidths currently in use are 1/8 and 1/4. |
| 272 | lvd | 27 | |
| 668 | lvd | 28 | `include "../include/tune.v" |
| 29 | |||
| 272 | lvd | 30 | module video_top( |
| 31 | |||
| 32 | input wire clk, // 28 MHz clock |
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| 33 | |||
| 34 | |||
| 35 | // external video outputs |
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| 36 | output wire [ 1:0] vred, |
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| 37 | output wire [ 1:0] vgrn, |
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| 38 | output wire [ 1:0] vblu, |
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| 39 | output wire vhsync, |
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| 40 | output wire vvsync, |
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| 41 | output wire vcsync, |
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| 42 | |||
| 43 | |||
| 44 | // aux video inputs |
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| 322 | lvd | 45 | input wire [ 3:0] zxborder, // border zxcolor |
| 272 | lvd | 46 | |
| 47 | |||
| 48 | // config inputs |
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| 49 | input wire [ 1:0] pent_vmode, // 2'b00 - standard ZX |
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| 50 | // 2'b01 - hardware multicolor |
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| 51 | // 2'b10 - pentagon 16 colors |
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| 52 | // 2'b11 - not defined yet |
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| 53 | |||
| 54 | input wire [ 2:0] atm_vmode, // 3'b011 - zx modes (pent_vmode is active) |
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| 55 | // 3'b010 - 640x200 hardware multicolor |
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| 56 | // 3'b000 - 320x200 16 colors |
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| 57 | // 3'b110 - 80x25 text mode |
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| 58 | // 3'b??? (others) - not defined yet |
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| 668 | lvd | 59 | |
| 272 | lvd | 60 | |
| 61 | input wire scr_page, // screen page (bit 3 of 7FFD) |
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| 62 | |||
| 63 | input wire vga_on, // vga mode ON - scandoubler activated |
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| 64 | |||
| 684 | lvd | 65 | input wire [ 1:0] modes_raster, // 2'b00 - pentagon raster (71680 clocks) |
| 66 | // 2'b01 - 60Hz raster |
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| 67 | // 2'b10 - 48k raster (69888 clocks) |
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| 68 | // 2'b11 - 128k raster (70908 clocks) |
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| 69 | |||
| 70 | input wire mode_contend_type, // 2'b0 - 48k/128k/+2 contend type (6 5 4 3 2 1 0 0) |
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| 71 | // 2'b1 - +2a/+3 contend type (1 0 7 6 5 4 3 2) |
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| 272 | lvd | 72 | |
| 73 | // memory synchronization inputs |
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| 334 | lvd | 74 | input wire cbeg, |
| 75 | input wire post_cbeg, |
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| 76 | input wire pre_cend, |
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| 272 | lvd | 77 | input wire cend, |
| 78 | |||
| 79 | |||
| 80 | // memory arbiter video port connection |
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| 319 | lvd | 81 | input wire video_strobe, |
| 82 | input wire video_next, |
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| 83 | output wire [20:0] video_addr, |
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| 84 | input wire [15:0] video_data, |
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| 85 | output wire [ 1:0] video_bw, |
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| 322 | lvd | 86 | output wire video_go, |
| 87 | |||
| 88 | |||
| 89 | // atm palette write strobe adn data |
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| 90 | input wire atm_palwr, |
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| 328 | lvd | 91 | input wire [ 5:0] atm_paldata, |
| 92 | |||
| 395 | lvd | 93 | |
| 668 | lvd | 94 | input wire up_ena, |
| 95 | input wire up_palwr, |
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| 96 | input wire [ 5:0] up_paladdr, |
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| 97 | input wire [ 7:0] up_paldata, |
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| 98 | |||
| 99 | |||
| 100 | |||
| 543 | lvd | 101 | output wire int_start, |
| 102 | |||
| 103 | |||
| 104 | |||
| 105 | input wire [10:0] fnt_a, |
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| 106 | input wire [ 7:0] fnt_d, |
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| 107 | input wire fnt_wr, |
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| 108 | |||
| 109 | output wire [ 5:0] palcolor, // for palette readback |
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| 110 | |||
| 684 | lvd | 111 | output wire [ 7:0] fontrom_readback, |
| 112 | |||
| 113 | output wire contend // for 48k/128k contended memory emulation |
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| 272 | lvd | 114 | ); |
| 115 | |||
| 275 | lvd | 116 | // these decoded in video_modedecode.v |
| 117 | wire mode_atm_n_pent; |
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| 118 | wire mode_zx; |
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| 119 | wire mode_p_16c; |
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| 120 | wire mode_p_hmclr; |
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| 121 | wire mode_a_hmclr; |
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| 322 | lvd | 122 | wire mode_a_16c; |
| 123 | wire mode_a_text; |
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| 528 | lvd | 124 | wire mode_a_txt_1page; |
| 275 | lvd | 125 | wire mode_pixf_14; |
| 272 | lvd | 126 | |
| 127 | |||
| 275 | lvd | 128 | |
| 317 | lvd | 129 | // synchronization |
| 130 | wire hsync_start; |
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| 131 | wire line_start; |
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| 132 | wire hint_start; |
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| 275 | lvd | 133 | |
| 323 | lvd | 134 | |
| 317 | lvd | 135 | wire vblank; |
| 136 | wire hblank; |
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| 328 | lvd | 137 | |
| 323 | lvd | 138 | wire vpix; |
| 139 | wire hpix; |
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| 328 | lvd | 140 | |
| 317 | lvd | 141 | wire vsync; |
| 142 | wire hsync; |
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| 328 | lvd | 143 | |
| 323 | lvd | 144 | wire vga_hsync; |
| 145 | |||
| 317 | lvd | 146 | wire scanin_start; |
| 323 | lvd | 147 | wire scanout_start; |
| 275 | lvd | 148 | |
| 323 | lvd | 149 | |
| 150 | |||
| 318 | lvd | 151 | wire fetch_start; |
| 152 | wire fetch_end; |
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| 322 | lvd | 153 | wire fetch_sync; |
| 275 | lvd | 154 | |
| 155 | |||
| 322 | lvd | 156 | wire [63:0] pic_bits; |
| 317 | lvd | 157 | |
| 158 | |||
| 323 | lvd | 159 | wire [3:0] pixels; |
| 317 | lvd | 160 | |
| 161 | |||
| 323 | lvd | 162 | wire [5:0] color; |
| 163 | wire [5:0] vga_color; |
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| 317 | lvd | 164 | |
| 165 | |||
| 395 | lvd | 166 | wire [2:0] typos; |
| 317 | lvd | 167 | |
| 668 | lvd | 168 | |
| 169 | // ulaplus related |
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| 170 | wire [ 1:0] up_palsel; |
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| 171 | wire [ 2:0] up_paper; |
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| 172 | wire [ 2:0] up_ink; |
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| 173 | wire up_pixel; |
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| 395 | lvd | 174 | |
| 175 | |||
| 684 | lvd | 176 | // border sync for 48k/128k emulation |
| 177 | wire border_sync; |
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| 178 | |||
| 179 | |||
| 180 | |||
| 275 | lvd | 181 | // decode video modes |
| 182 | video_modedecode video_modedecode( |
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| 183 | |||
| 184 | .clk(clk), |
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| 185 | |||
| 186 | .pent_vmode(pent_vmode), |
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| 187 | .atm_vmode (atm_vmode), |
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| 188 | |||
| 528 | lvd | 189 | .mode_atm_n_pent (mode_atm_n_pent ), |
| 190 | .mode_zx (mode_zx ), |
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| 191 | .mode_p_16c (mode_p_16c ), |
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| 192 | .mode_p_hmclr (mode_p_hmclr ), |
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| 193 | .mode_a_hmclr (mode_a_hmclr ), |
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| 194 | .mode_a_16c (mode_a_16c ), |
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| 195 | .mode_a_text (mode_a_text ), |
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| 196 | .mode_a_txt_1page(mode_a_txt_1page), |
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| 275 | lvd | 197 | |
| 319 | lvd | 198 | .mode_pixf_14(mode_pixf_14), |
| 199 | |||
| 200 | .mode_bw(video_bw) |
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| 275 | lvd | 201 | ); |
| 202 | |||
| 203 | |||
| 204 | |||
| 205 | |||
| 206 | |||
| 207 | |||
| 317 | lvd | 208 | // vertical sync generator |
| 209 | video_sync_v video_sync_v( |
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| 275 | lvd | 210 | |
| 317 | lvd | 211 | .clk(clk), |
| 275 | lvd | 212 | |
| 317 | lvd | 213 | .mode_atm_n_pent(mode_atm_n_pent), |
| 684 | lvd | 214 | .modes_raster(modes_raster), |
| 275 | lvd | 215 | |
| 317 | lvd | 216 | .hsync_start(hsync_start), |
| 217 | .line_start(line_start), |
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| 218 | .hint_start(hint_start), |
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| 275 | lvd | 219 | |
| 317 | lvd | 220 | .vblank(vblank), |
| 221 | .vsync(vsync), |
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| 222 | .vpix(vpix), |
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| 275 | lvd | 223 | |
| 317 | lvd | 224 | .int_start(int_start) |
| 225 | ); |
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| 226 | |||
| 227 | |||
| 228 | // horizontal sync generator |
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| 229 | video_sync_h video_sync_h( |
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| 230 | |||
| 231 | .clk(clk), |
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| 232 | |||
| 233 | .mode_atm_n_pent(mode_atm_n_pent), |
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| 528 | lvd | 234 | .mode_a_text (mode_a_text), |
| 317 | lvd | 235 | |
| 684 | lvd | 236 | .modes_raster (modes_raster ), |
| 237 | .mode_contend_type(mode_contend_type), |
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| 317 | lvd | 238 | |
| 239 | .init(1'b0), |
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| 240 | |||
| 241 | .pre_cend(pre_cend), |
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| 334 | lvd | 242 | .cend (cend ), |
| 317 | lvd | 243 | |
| 244 | |||
| 245 | .hblank(hblank), |
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| 246 | .hsync(hsync), |
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| 684 | lvd | 247 | .vpix(vpix), |
| 317 | lvd | 248 | .hpix(hpix), |
| 249 | |||
| 250 | .line_start(line_start), |
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| 251 | .hsync_start(hsync_start), |
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| 252 | |||
| 253 | .hint_start(hint_start), |
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| 254 | |||
| 318 | lvd | 255 | .scanin_start(scanin_start), |
| 256 | |||
| 257 | .fetch_start(fetch_start), |
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| 684 | lvd | 258 | .fetch_end (fetch_end ), |
| 322 | lvd | 259 | |
| 684 | lvd | 260 | .contend(contend), |
| 261 | |||
| 262 | .border_sync(border_sync) |
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| 317 | lvd | 263 | ); |
| 264 | |||
| 265 | |||
| 319 | lvd | 266 | // address generation |
| 267 | video_addrgen video_addrgen( |
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| 317 | lvd | 268 | |
| 319 | lvd | 269 | .clk(clk), |
| 317 | lvd | 270 | |
| 319 | lvd | 271 | .video_addr(video_addr), |
| 272 | .video_next(video_next), |
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| 273 | |||
| 355 | lvd | 274 | .line_start(hsync_start), |
| 334 | lvd | 275 | .int_start (int_start ), |
| 276 | .vpix (vpix ), |
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| 319 | lvd | 277 | |
| 278 | .scr_page(scr_page), |
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| 279 | |||
| 335 | lvd | 280 | .typos(typos), |
| 319 | lvd | 281 | |
| 528 | lvd | 282 | .mode_atm_n_pent (mode_atm_n_pent ), |
| 283 | .mode_zx (mode_zx ), |
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| 284 | .mode_p_16c (mode_p_16c ), |
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| 285 | .mode_p_hmclr (mode_p_hmclr ), |
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| 286 | .mode_a_hmclr (mode_a_hmclr ), |
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| 287 | .mode_a_16c (mode_a_16c ), |
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| 288 | .mode_a_text (mode_a_text ), |
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| 289 | .mode_a_txt_1page(mode_a_txt_1page) |
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| 319 | lvd | 290 | ); |
| 291 | |||
| 292 | |||
| 322 | lvd | 293 | // data fetch |
| 294 | video_fetch video_fetch( |
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| 319 | lvd | 295 | |
| 322 | lvd | 296 | .clk(clk), |
| 297 | |||
| 334 | lvd | 298 | .pre_cend (pre_cend), |
| 299 | .cend (cend ), |
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| 322 | lvd | 300 | |
| 333 | lvd | 301 | .vpix(vpix), |
| 302 | |||
| 322 | lvd | 303 | .fetch_start(fetch_start), |
| 304 | .fetch_end (fetch_end ), |
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| 305 | |||
| 306 | .fetch_sync (fetch_sync ), |
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| 307 | |||
| 308 | .video_data (video_data ), |
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| 309 | .video_strobe(video_strobe), |
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| 310 | .video_go (video_go ), |
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| 311 | |||
| 312 | .pic_bits(pic_bits) |
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| 313 | ); |
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| 314 | |||
| 315 | |||
| 316 | // render fetched data to pixels |
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| 317 | video_render video_render( |
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| 318 | |||
| 319 | .clk(clk), |
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| 320 | |||
| 321 | .pic_bits(pic_bits), |
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| 322 | |||
| 330 | lvd | 323 | .fetch_sync(fetch_sync), |
| 328 | lvd | 324 | |
| 336 | lvd | 325 | .cbeg (cbeg ), |
| 334 | lvd | 326 | .post_cbeg(post_cbeg), |
| 336 | lvd | 327 | .pre_cend (pre_cend ), |
| 334 | lvd | 328 | .cend (cend ), |
| 330 | lvd | 329 | |
| 325 | lvd | 330 | .int_start(int_start), |
| 322 | lvd | 331 | |
| 332 | .mode_atm_n_pent(mode_atm_n_pent), |
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| 333 | .mode_zx (mode_zx ), |
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| 334 | .mode_p_16c (mode_p_16c ), |
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| 335 | .mode_p_hmclr (mode_p_hmclr ), |
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| 336 | .mode_a_hmclr (mode_a_hmclr ), |
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| 337 | .mode_a_16c (mode_a_16c ), |
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| 338 | .mode_a_text (mode_a_text ), |
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| 334 | lvd | 339 | .mode_pixf_14 (mode_pixf_14 ), |
| 322 | lvd | 340 | |
| 336 | lvd | 341 | .typos(typos), |
| 395 | lvd | 342 | |
| 394 | tsl | 343 | .pixels(pixels), |
| 322 | lvd | 344 | |
| 668 | lvd | 345 | .up_palsel(up_palsel), |
| 346 | .up_paper (up_paper ), |
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| 347 | .up_ink (up_ink ), |
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| 348 | .up_pixel (up_pixel ), |
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| 322 | lvd | 349 | |
| 668 | lvd | 350 | |
| 528 | lvd | 351 | .fnt_a (fnt_a ), |
| 352 | .fnt_d (fnt_d ), |
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| 543 | lvd | 353 | .fnt_wr(fnt_wr), |
| 354 | |||
| 355 | .fontrom_readback(fontrom_readback) |
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| 528 | lvd | 356 | ); |
| 357 | |||
| 358 | |||
| 323 | lvd | 359 | // combine border and pixels, apply palette |
| 360 | video_palframe video_palframe( |
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| 322 | lvd | 361 | |
| 323 | lvd | 362 | .clk(clk), |
| 322 | lvd | 363 | |
| 323 | lvd | 364 | .hblank(hblank), |
| 365 | .vblank(vblank), |
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| 366 | |||
| 668 | lvd | 367 | .hsync_start(hsync_start), |
| 368 | .vsync (vsync ), |
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| 369 | |||
| 323 | lvd | 370 | .hpix(hpix), |
| 371 | .vpix(vpix), |
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| 372 | |||
| 373 | .pixels(pixels), |
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| 329 | lvd | 374 | .border(zxborder), |
| 323 | lvd | 375 | |
| 684 | lvd | 376 | .border_sync (border_sync ), |
| 377 | .border_sync_ena(modes_raster[1]), |
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| 378 | |||
| 323 | lvd | 379 | .atm_palwr (atm_palwr ), |
| 380 | .atm_paldata(atm_paldata), |
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| 668 | lvd | 381 | |
| 382 | .up_palsel(up_palsel), |
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| 383 | .up_paper (up_paper ), |
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| 384 | .up_ink (up_ink ), |
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| 385 | .up_pixel (up_pixel ), |
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| 386 | |||
| 387 | .up_ena (up_ena ), |
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| 388 | .up_paladdr(up_paladdr), |
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| 389 | .up_paldata(up_paldata), |
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| 390 | .up_palwr (up_palwr ), |
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| 323 | lvd | 391 | |
| 528 | lvd | 392 | .color(color), |
| 393 | |||
| 394 | .palcolor(palcolor) // palette readback |
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| 323 | lvd | 395 | ); |
| 396 | |||
| 397 | |||
| 398 | // VGA hsync doubling |
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| 399 | video_vga_sync_h video_vga_sync_h( |
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| 328 | lvd | 400 | |
| 323 | lvd | 401 | .clk(clk), |
| 402 | |||
| 403 | .hsync_start(hsync_start), |
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| 684 | lvd | 404 | |
| 405 | .modes_raster(modes_raster), |
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| 323 | lvd | 406 | |
| 407 | .scanout_start(scanout_start), |
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| 408 | |||
| 409 | .vga_hsync(vga_hsync) |
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| 410 | ); |
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| 411 | |||
| 412 | |||
| 413 | // VGA scandoubling |
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| 325 | lvd | 414 | video_vga_double video_vga_double( |
| 323 | lvd | 415 | |
| 416 | .clk(clk), |
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| 417 | |||
| 418 | .hsync_start (hsync_start ), |
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| 419 | .scanout_start(scanout_start), |
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| 420 | .scanin_start (scanin_start ), |
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| 421 | |||
| 422 | .pix_in(color), |
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| 423 | |||
| 329 | lvd | 424 | .pix_out(vga_color) |
| 323 | lvd | 425 | ); |
| 426 | |||
| 427 | |||
| 428 | // final MUXing of VGA and TV signals |
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| 429 | video_outmux video_outmux( |
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| 430 | |||
| 431 | .clk(clk), |
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| 432 | |||
| 331 | lvd | 433 | .vga_on(vga_on), |
| 328 | lvd | 434 | |
| 331 | lvd | 435 | |
| 323 | lvd | 436 | .tvcolor(color), |
| 329 | lvd | 437 | .vgacolor(vga_color), |
| 323 | lvd | 438 | |
| 439 | .vga_hsync(vga_hsync), |
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| 440 | .hsync (hsync ), |
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| 441 | .vsync (vsync ), |
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| 442 | |||
| 443 | .vred(vred), |
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| 444 | .vgrn(vgrn), |
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| 445 | .vblu(vblu), |
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| 446 | |||
| 447 | .vhsync(vhsync), |
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| 448 | .vvsync(vvsync), |
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| 449 | .vcsync(vcsync) |
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| 450 | ); |
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| 451 | |||
| 452 | |||
| 453 | |||
| 454 | |||
| 455 | |||
| 395 | lvd | 456 | |
| 272 | lvd | 457 | endmodule |
| 458 |