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   1 //===============================================================================
   2 // FPGA MOONCRESTA COLOR-PALETTE
   3 //
   4 // Version : 2.00
   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 // 2004- 9-18 added Xilinx Device.  K.Degawa
  15 //================================================================================
  16 `include "src/mc_conf.v"
  17
  18 module mc_col_pal(
  19
  20 I_CLK_12M,
  21 I_CLK_6M,
  22 I_VID,
  23 I_COL,
  24 I_C_BLnX,
  25
  26 O_C_BLX,
  27 O_STARS_OFFn,
  28 O_R,
  29 O_G,
  30 O_B
  31
  32 );
  33
  34 input  I_CLK_12M;
  35 input  I_CLK_6M;
  36 input  [1:0]I_VID;
  37 input  [2:0]I_COL;
  38 input  I_C_BLnX;
  39
  40 output O_C_BLX;
  41 output O_STARS_OFFn;
  42 output [2:0]O_R;
  43 output [2:0]O_G;
  44 output [1:0]O_B;
  45
  46 //---    Parts 6M    --------------------------------------------------------
  47 wire   [6:0]W_6M_DI = {I_COL[2:0],I_VID[1:0],~(I_VID[0]|I_VID[1]),I_C_BLnX};
  48 reg    [6:0]W_6M_DO;
  49
  50 wire   W_6M_CLR = W_6M_DI[0]|W_6M_DO[0];
  51 assign O_C_BLX = ~(W_6M_DI[0]|W_6M_DO[0]);
  52 assign O_STARS_OFFn = W_6M_DO[1];
  53
  54 always@(posedge I_CLK_6M or negedge W_6M_CLR)
  55 begin
  56    if(W_6M_CLR==1'b0)
  57       W_6M_DO <= 7'h00;
  58    else
  59       W_6M_DO <= W_6M_DI;
  60 end
  61 //---    COL ROM     --------------------------------------------------------
  62 wire   [4:0]W_COL_ROM_A = W_6M_DO[6:2];
  63 wire   [7:0]W_COL_ROM_DO;
  64 wire   W_COL_ROM_OEn = W_6M_DO[1];
  65
  66 `ifdef DEVICE_CYCLONE
  67 mc_col_rom COL_ROM(
  68
  69 .I_CLK(I_CLK_12M),
  70 .I_ADDR(W_COL_ROM_A),
  71 .O_DO(W_COL_ROM_DO),
  72 .I_OEn(W_COL_ROM_OEn)
  73
  74 );
  75 `endif
  76 `ifdef DEVICE_SPARTAN2E
  77 GALAXIAN_6L COL_ROM(
  78 .CLK(I_CLK_12M),
  79 .ADDR(W_COL_ROM_A),
  80 .DATA(W_COL_ROM_DO),
  81 .ENA(1'b1)
  82 );
  83 //RAMB4_S8 col_rom00(
  84 //
  85 //.CLK(I_CLK_12M),
  86 //.ADDR({4'b0000,W_COL_ROM_A[4:0]}),
  87 //.DI(8'h00),
  88 //.DO(W_COL_ROM_DO),
  89 //.EN(1'b1),
  90 //.WE(1'b0),
  91 //.RST(1'b0)
  92 //
  93 //);
  94 `endif
  95 //---    VID OUT     --------------------------------------------------------
  96 assign O_R[0] = W_COL_ROM_DO[2];
  97 assign O_R[1] = W_COL_ROM_DO[1];
  98 assign O_R[2] = W_COL_ROM_DO[0];
  99
 100 assign O_G[0] = W_COL_ROM_DO[5];
 101 assign O_G[1] = W_COL_ROM_DO[4];
 102 assign O_G[2] = W_COL_ROM_DO[3];
 103
 104 assign O_B[0] = W_COL_ROM_DO[7];
 105 assign O_B[1] = W_COL_ROM_DO[6];
 106
 107
 108 endmodule