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

   1 module galaxian_roms(
   2 I_ROM_CLK,
   3 I_ADDR,
   4 O_DATA
   5 );
   6
   7 input I_ROM_CLK;
   8 input [18:0]I_ADDR;
   9 output [7:0]O_DATA;
  10
  11 //CPU-Roms
  12 wire [7:0]U_ROM_D;
  13
  14 GALAXIAN_U U_ROM(
  15 .CLK(I_ROM_CLK),
  16 .ADDR(I_ADDR[10:0]),
  17 .DATA(U_ROM_D),
  18 .ENA(1'b1)
  19 );
  20
  21 wire [7:0]V_ROM_D;
  22
  23 GALAXIAN_V V_ROM(
  24 .CLK(I_ROM_CLK),
  25 .ADDR(I_ADDR[10:0]),
  26 .DATA(V_ROM_D),
  27 .ENA(1'b1)
  28 );
  29
  30 wire [7:0]W_ROM_D;
  31
  32 GALAXIAN_W W_ROM(
  33 .CLK(I_ROM_CLK),
  34 .ADDR(I_ADDR[10:0]),
  35 .DATA(W_ROM_D),
  36 .ENA(1'b1)
  37 );
  38
  39 wire [7:0]Y_ROM_D;
  40
  41 GALAXIAN_Y Y_ROM(
  42 .CLK(I_ROM_CLK),
  43 .ADDR(I_ADDR[10:0]),
  44 .DATA(Y_ROM_D),
  45 .ENA(1'b1)
  46 );
  47
  48 //7L CPU-Rom
  49 wire [7:0]L_ROM_D;
  50
  51 GALAXIAN_7L L_ROM(
  52 .CLK(I_ROM_CLK),
  53 .ADDR(I_ADDR[10:0]),
  54 .DATA(L_ROM_D),
  55 .ENA(1'b1)
  56 );
  57
  58 reg [7:0]DATA_OUT;
  59
  60 //    address map
  61 //--------------------------------------------------
  62 // 0x00000 - 0x007FF       galmidw.u        CPU-ROM
  63 // 0x00800 - 0x00FFF       galmidw.v        CPU-ROM
  64 // 0x01000 - 0x017FF       galmidw.w        CPU-ROM
  65 // 0x01800 - 0x01FFF       galmidw.y        CPU-ROM
  66 // 0x02000 - 0x027FF       7l               CPU-ROM
  67 // 0x04000 - 0x047FF       1k.bin           VID-ROM
  68 // 0x05000 - 0x057FF       1h.bin           VID-ROM
  69 // 0x10000 - 0x3FFFF       mc_wav_2.bin     Sound(Wav)Data
  70 always@(posedge I_ROM_CLK)
  71 begin
  72         if (I_ADDR <= 18'h7ff) begin
  73                 //u
  74                 DATA_OUT <= U_ROM_D;
  75         end
  76         else if (I_ADDR >= 18'h800 && I_ADDR <= 18'hfff) begin
  77                 //v
  78                 DATA_OUT <= V_ROM_D;
  79         end
  80         else if (I_ADDR >= 18'h1000 && I_ADDR <= 18'h17ff) begin
  81                 //w
  82                 DATA_OUT <= W_ROM_D;
  83         end
  84         else if (I_ADDR >= 18'h1800 && I_ADDR <= 18'h1fff) begin
  85                 //y
  86                 DATA_OUT <= Y_ROM_D;
  87         end
  88         else if (I_ADDR >= 18'h2000 && I_ADDR <= 18'h27ff) begin
  89                 //7l
  90                 DATA_OUT <= L_ROM_D;
  91         end
  92         else begin
  93                 DATA_OUT <= DATA_OUT;
  94         end
  95 end
  96
  97 assign O_DATA = DATA_OUT;
  98
  99 endmodule