Rev 896 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 668 | lvd | 1 | // ZX-Evo Base Configuration (c) NedoPC 2008,2009,2010,2011,2012,2013,2014 |
| 275 | lvd | 2 | // |
| 3 | // decoding mode setup: which border, which modes in one-hot style coding |
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| 4 | |||
| 668 | lvd | 5 | /* |
| 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 | `include "../include/tune.v" |
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| 25 | |||
| 275 | lvd | 26 | module video_modedecode( |
| 27 | |||
| 28 | input wire clk, |
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| 29 | |||
| 30 | input wire [ 1:0] pent_vmode, // inputs as set by Z80 environment |
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| 31 | input wire [ 2:0] atm_vmode, // |
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| 32 | |||
| 33 | |||
| 34 | output reg mode_atm_n_pent, // =1 - atm modes, =0 - pentagon modes (mainly for border and visible area changing) |
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| 35 | |||
| 36 | |||
| 37 | output reg mode_zx, // standard ZX mode |
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| 38 | |||
| 39 | output reg mode_p_16c, // pentagon 16 colors |
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| 40 | output reg mode_p_hmclr, // pentagon hardware multicolor |
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| 41 | |||
| 319 | lvd | 42 | |
| 275 | lvd | 43 | output reg mode_a_hmclr, // 640x200 atm hardware multicolor |
| 44 | output reg mode_a_16c, // 320x200 atm 16 colors |
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| 45 | output reg mode_a_text, // 640x200 (80x25 symbols) atm text mode |
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| 528 | lvd | 46 | output reg mode_a_txt_1page, // atm text mode in a single page (modifier for mode_a_text) |
| 275 | lvd | 47 | |
| 48 | output reg mode_pixf_14, // =1: 14MHz pixelclock on (default is 7MHz). |
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| 319 | lvd | 49 | |
| 50 | |||
| 51 | output reg [ 1:0] mode_bw // required bandwidth: 2'b00 - 1/8, 2'b01 - 1/4, |
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| 52 | // 2'b10 - 1/2, 2'b11 - 1 |
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| 275 | lvd | 53 | ); |
| 54 | |||
| 55 | // values for pent_vmode and atm_vmode: |
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| 56 | |||
| 57 | // pent: |
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| 58 | // 2'b00 - standard ZX |
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| 59 | // 2'b01 - hardware multicolor |
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| 60 | // 2'b10 - pentagon 16 colors |
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| 61 | // 2'b11 - not defined yet |
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| 62 | |||
| 63 | // atm: |
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| 64 | // 3'b011 - zx modes (pent_vmode is active) |
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| 65 | // 3'b010 - 640x200 hardware multicolor |
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| 66 | // 3'b000 - 320x200 16 colors |
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| 67 | // 3'b110 - 80x25 text mode |
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| 528 | lvd | 68 | // 3'b111 - 80x25 text mode (single page) |
| 275 | lvd | 69 | // 3'b??? (others) - not defined yet |
| 70 | |||
| 71 | |||
| 72 | |||
| 73 | |||
| 74 | always @(posedge clk) |
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| 75 | begin |
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| 76 | case( atm_vmode ) |
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| 77 | 3'b010: mode_atm_n_pent <= 1'b1; |
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| 78 | 3'b000: mode_atm_n_pent <= 1'b1; |
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| 79 | 3'b110: mode_atm_n_pent <= 1'b1; |
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| 528 | lvd | 80 | 3'b111: mode_atm_n_pent <= 1'b1; |
| 275 | lvd | 81 | |
| 82 | 3'b011: mode_atm_n_pent <= 1'b0; |
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| 83 | default: mode_atm_n_pent <= 1'b0; |
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| 84 | endcase |
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| 85 | |||
| 86 | |||
| 87 | case( atm_vmode ) |
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| 88 | 3'b010: mode_zx <= 1'b0; |
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| 89 | 3'b000: mode_zx <= 1'b0; |
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| 90 | 3'b110: mode_zx <= 1'b0; |
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| 528 | lvd | 91 | 3'b111: mode_zx <= 1'b0; |
| 275 | lvd | 92 | |
| 93 | default: begin |
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| 94 | if( (pent_vmode==2'b00) || (pent_vmode==2'b11) ) |
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| 332 | lvd | 95 | mode_zx <= 1'b1; |
| 96 | else |
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| 275 | lvd | 97 | mode_zx <= 1'b0; |
| 98 | end |
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| 99 | endcase |
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| 100 | |||
| 101 | |||
| 102 | |||
| 103 | if( (atm_vmode==3'b011) && (pent_vmode==2'b10) ) |
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| 104 | mode_p_16c <= 1'b1; |
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| 105 | else |
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| 106 | mode_p_16c <= 1'b0; |
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| 107 | |||
| 108 | |||
| 109 | if( (atm_vmode==3'b011) && (pent_vmode==2'b01) ) |
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| 110 | mode_p_hmclr <= 1'b1; |
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| 111 | else |
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| 112 | mode_p_hmclr <= 1'b0; |
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| 113 | |||
| 114 | |||
| 115 | if( atm_vmode==3'b010 ) |
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| 116 | mode_a_hmclr <= 1'b1; |
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| 117 | else |
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| 118 | mode_a_hmclr <= 1'b0; |
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| 119 | |||
| 120 | |||
| 121 | if( atm_vmode==3'b000 ) |
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| 122 | mode_a_16c <= 1'b1; |
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| 123 | else |
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| 124 | mode_a_16c <= 1'b0; |
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| 125 | |||
| 126 | |||
| 528 | lvd | 127 | if( (atm_vmode==3'b110) || (atm_vmode==3'b111) ) |
| 275 | lvd | 128 | mode_a_text <= 1'b1; |
| 129 | else |
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| 130 | mode_a_text <= 1'b0; |
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| 131 | |||
| 528 | lvd | 132 | if( atm_vmode==3'b111 ) |
| 133 | mode_a_txt_1page <= 1'b1; |
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| 134 | else |
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| 135 | mode_a_txt_1page <= 1'b0; |
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| 275 | lvd | 136 | |
| 137 | |||
| 528 | lvd | 138 | |
| 139 | if( (atm_vmode==3'b010) || (atm_vmode==3'b110) || (atm_vmode==3'b111) ) |
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| 275 | lvd | 140 | mode_pixf_14 <= 1'b1; |
| 141 | else |
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| 142 | mode_pixf_14 <= 1'b0; |
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| 143 | |||
| 319 | lvd | 144 | |
| 145 | |||
| 146 | if( (atm_vmode==3'b011) && (pent_vmode!=2'b10) ) |
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| 147 | mode_bw <= 2'b00; // 1/8 |
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| 148 | else |
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| 149 | mode_bw <= 2'b01; // 1/4 |
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| 150 | |||
| 151 | |||
| 275 | lvd | 152 | end |
| 153 | |||
| 154 | endmodule |
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| 155 |