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