git.zerfleddert.de Git - fpga-games/blob - galaxian/src/mc_vedio_mix.v

   1 //===============================================================================
   2 // FPGA MOONCRESTA VIDO-MIX
   3 //
   4 // Version : 1.00
   5 //
   6 // Copyright(c) 2004 Katsumi Degawa , All rights reserved
   7 //
   8 // Important !
   9 //
  10 // This program is freeware for non-commercial use.
  11 // An author does no guarantee about this program.
  12 // You can use this under your own risk.
  13 //
  14 //================================================================================
  15
  16
  17 module mc_vedio_mix(
  18
  19 I_VID_R,
  20 I_VID_G,
  21 I_VID_B,
  22 I_STR_R,
  23 I_STR_G,
  24 I_STR_B,
  25
  26 I_C_BLnXX,
  27 I_C_BLX,
  28 I_MISSILEn,
  29 I_SHELLn,
  30
  31 O_R,
  32 O_G,
  33 O_B
  34
  35 );
  36
  37 input  [2:0]I_VID_R;
  38 input  [2:0]I_VID_G;
  39 input  [1:0]I_VID_B;
  40 input  [2:0]I_STR_R;
  41 input  [2:0]I_STR_G;
  42 input  [1:0]I_STR_B;
  43
  44 input  I_C_BLnXX;
  45 input  I_C_BLX;
  46 input  I_MISSILEn;
  47 input  I_SHELLn;
  48
  49 output [2:0]O_R;
  50 output [2:0]O_G;
  51 output [1:0]O_B;
  52
  53 // MISSILE => Yellow ;
  54 // SHELL   => White  ;
  55 wire   W_MS_D = ~(I_MISSILEn & I_SHELLn);
  56 wire   W_MS_R = ~I_C_BLX  & W_MS_D;
  57 wire   W_MS_G = ~I_C_BLX  & W_MS_D;
  58 wire   W_MS_B = ~I_C_BLX  & W_MS_D & ~I_SHELLn ;
  59
  60 assign O_R = I_C_BLnXX ? I_VID_R | I_STR_R | {1'b0,W_MS_R,W_MS_R}: 3'b000 ;
  61 assign O_G = I_C_BLnXX ? I_VID_G | I_STR_G | {1'b0,W_MS_G,W_MS_G}: 3'b000 ;
  62 assign O_B = I_C_BLnXX ? I_VID_B | I_STR_B | {     W_MS_B,W_MS_B}: 2'b00  ;
  63
  64 endmodule