remove clock skew introduced by BUFGs

[fpga-games] / galaxian / src / mc_top.v

//===============================================================================
// FPGA GALAXIAN TOP
//
// Version : 2.50
//
// Copyright(c) 2004 Katsumi Degawa , All rights reserved
//
// Important !
//
// This program is freeware for non-commercial use. 
// An author does no guarantee about this program.
// You can use this under your own risk.
//
// 2004- 4-30  galaxian modify by K.DEGAWA
// 2004- 5- 6  first release.
// 2004- 8-23  Improvement with T80-IP.
// 2004- 9-18  The description of ALTERA(CYCLONE) and XILINX(SPARTAN2E) was made one.
// 2004- 9-22  The problem which missile didn't sometimes come out from was improved.
//================================================================================

`include "src/mc_conf.v"             
                                             
module mc_top(

//    FPGA_USE
I_CLK_125M,

`ifdef PSPAD_USE
// PS_PAD interface
psCLK,
psSEL,
psTXD,
psRXD,
`endif

//    INPORT SW IF
I_PSW,

//    SOUND OUT
O_SOUND_OUT_L,
O_SOUND_OUT_R,

//    VGA (VIDEO) IF
O_VGA_R,
O_VGA_G,
O_VGA_B,
O_VGA_H_SYNCn,
O_VGA_V_SYNCn

);

//    FPGA_USE
input  I_CLK_125M;

//    CPU ADDRESS BUS
wire   [15:0]W_A;
//    CPU IF
wire   W_CPU_RDn;
wire   W_CPU_WRn;
wire   W_CPU_MREQn;
wire   W_CPU_RFSHn;
wire   W_CPU_BUSAKn;
wire   W_CPU_IORQn;
wire   W_CPU_M1n;
wire   W_CPU_CLK;
wire   W_CPU_HRDWR_RESETn;
wire   W_CPU_WAITn;
wire   W_CPU_NMIn;

`ifdef PSPAD_USE
// PS_PAD interface
input   psRXD;
output  psTXD,psCLK,psSEL;
`endif

//    INPORT SW IF
input  [8:0]I_PSW;

//    SOUND OUT 
output  O_SOUND_OUT_L;
output  O_SOUND_OUT_R;

//    VGA (VIDEO) IF
output [3:0]O_VGA_R;
output [3:0]O_VGA_G;
output [3:0]O_VGA_B;
output O_VGA_H_SYNCn;
output O_VGA_V_SYNCn;

wire   W_RESETn = |(~I_PSW[8:5]);
//------ CLOCK GEN ---------------------------
wire   W_CLK_18M;
wire   W_CLK_36M;
wire   W_CLK_12M,WB_CLK_12M;
wire   W_CLK_6M,WB_CLK_6M;
wire   W_STARS_CLK;

mc_dcm clockgen(
.CLKIN_IN(I_CLK_125M),
.RST_IN(! W_RESETn),
.CLKFX_OUT(W_CLK_36M)
);

//------ H&V COUNTER -------------------------
wire   [8:0]W_H_CNT;
wire   [7:0]W_V_CNT;
wire   W_H_BL;
wire   W_V_BLn;
wire   W_C_BLn;
wire   W_H_SYNC;
wire   W_V_SYNC;

//------ CPU RAM  ----------------------------
wire   [7:0]W_CPU_RAM_DO;

//------ ADDRESS DECDER ----------------------
wire   W_CPU_ROM_CSn;
wire   W_CPU_RAM_RDn;
wire   W_CPU_RAM_WRn;
wire   W_CPU_RAM_CSn;
wire   W_OBJ_RAM_RDn;
wire   W_OBJ_RAM_WRn;
wire   W_OBJ_RAM_RQn;
wire   W_VID_RAM_RDn;
wire   W_VID_RAM_WRn;
wire   W_SW0_OEn;
wire   W_SW1_OEn;
wire   W_DIP_OEn;
wire   W_WDR_OEn;
wire   W_LAMP_WEn;
wire   W_SOUND_WEn;
wire   W_PITCHn;
wire   W_H_FLIP;
wire   W_V_FLIP;
wire   W_BD_G;
wire   W_STARS_ON;

wire   W_VID_RDn = W_OBJ_RAM_RDn & W_VID_RAM_RDn ;
wire   W_SW_OEn = W_SW0_OEn & W_SW1_OEn & W_DIP_OEn ;
//------- INPORT -----------------------------
wire   [7:0]W_SW_DO;
//------- VIDEO  -----------------------------
wire   [7:0]W_VID_DO;
//--------------------------------------------

mc_clock MC_CLK(

.I_CLK_36M(W_CLK_36M),
.O_CLK_18M(W_CLK_18M),
.O_CLK_12M(WB_CLK_12M),
.O_CLK_06M(WB_CLK_6M)

);

assign W_CLK_12M = WB_CLK_12M;
assign W_CLK_6M  = WB_CLK_6M;
//---  DATA I/F -------------------------------------
reg    [7:0]W_CPU_ROM_DO;
wire   [7:0]W_CPU_ROM_DOB = W_CPU_ROM_CSn ? 8'h00: W_CPU_ROM_DO ;

wire   [7:0]W_BDO = W_SW_DO | W_VID_DO | W_CPU_RAM_DO | W_CPU_ROM_DOB ;
wire   [7:0]W_BDI;

//---  CPU I/F  -------------------------------------
reg  [3:0]rst_count;
always@(posedge W_H_CNT[0] or negedge W_RESETn)
begin
   if(! W_RESETn) rst_count <= 0;
   else begin
      if( rst_count == 15) 
         rst_count <= rst_count;
      else
         rst_count <= rst_count+1;
   end
end

assign W_CPU_RESETn = W_RESETn;
assign W_CPU_CLK = W_H_CNT[0];

Z80IP CPU(
        
.CLK(W_CPU_CLK),
.RESET_N(W_CPU_RESETn),
.INT_N(1'b1),
.NMI_N(W_CPU_NMIn),
.ADRS(W_A),
.DOUT(W_BDI),
.DINP(W_BDO),
.M1_N(),
.MREQ_N(W_CPU_MREQn),
.IORQ_N(),
.RD_N(W_CPU_RDn ),
.WR_N(W_CPU_WRn ),
.WAIT_N(W_CPU_WAITn),
.BUSWO(),
.RFSH_N(W_CPU_RFSHn),
.HALT_N()

);

wire   W_CPU_RAM_CLK = W_CLK_12M & ~W_CPU_RAM_CSn;

mc_cpu_ram MC_CPU_RAM(

.I_CLK(W_CPU_RAM_CLK),
.I_ADDR(W_A[9:0]),
.I_D(W_BDI),
.I_WE(~W_CPU_WRn),
.I_OE(~W_CPU_RAM_RDn ),
.O_D(W_CPU_RAM_DO)

);


mc_adec MC_ADEC(

.I_CLK_12M(W_CLK_12M),
.I_CLK_6M(W_CLK_6M),
.I_CPU_CLK(W_H_CNT[0]),
.I_RSTn(W_RESETn),

.I_CPU_A(W_A),
.I_CPU_D(W_BDI[0]),
.I_MREQn(W_CPU_MREQn),
.I_RFSHn(W_CPU_RFSHn),
.I_RDn(W_CPU_RDn),
.I_WRn(W_CPU_WRn),
.I_H_BL(W_H_BL),
.I_V_BLn(W_V_BLn),

.O_WAITn(W_CPU_WAITn),
.O_NMIn(W_CPU_NMIn),
.O_CPU_ROM_CSn(W_CPU_ROM_CSn),
.O_CPU_RAM_RDn(W_CPU_RAM_RDn),
.O_CPU_RAM_WRn(W_CPU_RAM_WRn),
.O_CPU_RAM_CSn(W_CPU_RAM_CSn),
.O_OBJ_RAM_RDn(W_OBJ_RAM_RDn),
.O_OBJ_RAM_WRn(W_OBJ_RAM_WRn),
.O_OBJ_RAM_RQn(W_OBJ_RAM_RQn),
.O_VID_RAM_RDn(W_VID_RAM_RDn),
.O_VID_RAM_WRn(W_VID_RAM_WRn),
.O_SW0_OEn(W_SW0_OEn),
.O_SW1_OEn(W_SW1_OEn),
.O_DIP_OEn(W_DIP_OEn),
.O_WDR_OEn(W_WDR_OEn),
.O_LAMP_WEn(W_LAMP_WEn),
.O_SOUND_WEn(W_SOUND_WEn),
.O_PITCHn(W_PITCHn),
.O_H_FLIP(W_H_FLIP),
.O_V_FLIP(W_V_FLIP),
.O_BD_G(W_BD_G),
.O_STARS_ON(W_STARS_ON)

);

//-------- SOUND I/F -----------------------------
//---  Parts 9L ---------
reg    [7:0]W_9L_Q;
always@(posedge W_CLK_12M or negedge W_RESETn)
begin
   if(W_RESETn == 1'b0)begin
      W_9L_Q <= 0;
   end 
   else begin
      if(W_SOUND_WEn == 1'b0)begin
         case(W_A[2:0])
            3'h0 : W_9L_Q[0] <= W_BDI[0];
            3'h1 : W_9L_Q[1] <= W_BDI[0];
            3'h2 : W_9L_Q[2] <= W_BDI[0];
            3'h3 : W_9L_Q[3] <= W_BDI[0];
            3'h4 : W_9L_Q[4] <= W_BDI[0];
            3'h5 : W_9L_Q[5] <= W_BDI[0];
            3'h6 : W_9L_Q[6] <= W_BDI[0];
            3'h7 : W_9L_Q[7] <= W_BDI[0];
         endcase
      end
   end
end
wire   W_VOL1 = W_9L_Q[6];
wire   W_VOL2 = W_9L_Q[7];
wire   W_FIRE = W_9L_Q[5];
wire   W_HIT  = W_9L_Q[3];
wire   W_FS3  = W_9L_Q[2];
wire   W_FS2  = W_9L_Q[1];
wire   W_FS1  = W_9L_Q[0];
//---------------------------------------------------
//---- CPU DATA WATCH -------------------------------
wire   ZMWR = W_CPU_MREQn | W_CPU_WRn ;

reg   [1:0]on_game;
always @(posedge W_CPU_CLK)
begin
   if(~ZMWR)begin
      if(W_A == 16'h4007)begin
         if(W_BDI == 8'h00) 
            on_game[0] <= 1;
         else
            on_game[0] <= 0;
      end
      if(W_A == 16'h4005)begin
         if(W_BDI == 8'h03 || W_BDI == 8'h04 ) 
            on_game[1] <= 1;
         else
            on_game[1] <= 0;
      end
   end  
end

`ifdef PSPAD_USE
reg   died;
always @(posedge W_CPU_CLK)
begin
   if(~ZMWR)begin
      if(W_A == 16'h4206)begin
         if(W_BDI == 8'h00) 
            died <= 0;
         else
            died <= 1;
      end
   end
end
//---- PS_PAD Interface -----------------------------
wire    [8:0]ps_PSW;
wire    VIB_SW = died & (&on_game[1:0]);

fpga_arcade_if pspad(

.CLK_18M432(W_CLK_18M),
.I_RSTn(W_RESETn),
.psCLK(psCLK),
.psSEL(psSEL),
.psTXD(psTXD),
.psRXD(psRXD),
.ps_PSW(ps_PSW),
.I_VIB_SW(VIB_SW)

);
`endif
//---- SW Interface ---------------------------------
`ifdef PSPAD_USE
wire   L1 = I_PSW[2] & ps_PSW[2];
wire   R1 = I_PSW[3] & ps_PSW[3];
wire   U1 = I_PSW[0];
wire   D1 = I_PSW[1];
wire   J1 = I_PSW[4] & ps_PSW[8];

wire   S1 = (U1|J1)  & ps_PSW[6];
wire   S2 = (D1|J1)  & ps_PSW[7];

wire   C1 = (L1|R1|U1|~D1) & ps_PSW[4];
`else
wire   L1 = ! I_PSW[2];
wire   R1 = ! I_PSW[3];
wire   U1 = ! I_PSW[0];
wire   D1 = ! I_PSW[1];
wire   J1 = ! I_PSW[4];

wire   S1 = ! I_PSW[5];
wire   S2 = ! I_PSW[7];

wire   C1 = ! I_PSW[6];
`endif
wire   C2 = ! I_PSW[8];

wire   L2 = L1;
wire   R2 = R1;
wire   U2 = U1;
wire   D2 = D1;
wire   J2 = J1;

mc_inport MC_INPORT(

.I_COIN1(~C1),      //  ACTIVE HI
.I_COIN2(~C2),      //  ACTIVE HI
.I_1P_LE(~L1),      //  ACTIVE HI
.I_1P_RI(~R1),      //  ACTIVE HI
.I_1P_SH(~J1),      //  ACTIVE HI
.I_2P_LE(~L2),      //  ACTIVE HI
.I_2P_RI(~R2),      //  ACTIVE HI
.I_2P_SH(~J2),      //  ACTIVE HI
.I_1P_START(~S1),   //  ACTIVE HI
.I_2P_START(~S2),   //  ACTIVE HI

.I_SW0_OEn(W_SW0_OEn),
.I_SW1_OEn(W_SW1_OEn),
.I_DIP_OEn(W_DIP_OEn),

.O_D(W_SW_DO)

);

//-----------------------------------------------------------------------------
//------- ROM           -------------------------------------------------------
reg    [18:0]ROM_A;

wire   [18:0]W_WAV_A0,W_WAV_A1,W_WAV_A2;
reg    [7:0]W_WAV_D0,W_WAV_D1,W_WAV_D2;

wire   [7:0]ROM_D;

galaxian_roms ROMS(
.I_ROM_CLK(W_CLK_12M),
.I_ADDR({3'h0,W_A[15:0]}),
.O_DATA(ROM_D)
);

always@(posedge W_CLK_12M)
begin
        W_CPU_ROM_DO <= ROM_D;
end

//-----------------------------------------------------------------------------

wire   W_V_BL2n;

mc_hv_count MC_HV(

.I_CLK(WB_CLK_6M),
.I_RSTn(W_RESETn),

.O_H_CNT(W_H_CNT),
.O_H_SYNC(W_H_SYNC),
.O_H_BL(W_H_BL),
.O_V_CNT(W_V_CNT),
.O_V_SYNC(W_V_SYNC),
.O_V_BL2n(W_V_BL2n),
.O_V_BLn(W_V_BLn),
.O_C_BLn(W_C_BLn)

);

//------ VIDEO  -----------------------------
wire   W_8HF;
wire   W_1VF;
wire   W_C_BLnX;
wire   W_256HnX;
wire   W_MISSILEn;
wire   W_SHELLn;
wire   [1:0]W_VID;
wire   [2:0]W_COL;

mc_video MC_VID(
.I_CLK_18M(W_CLK_18M),
.I_CLK_12M(W_CLK_12M),
.I_CLK_6M(W_CLK_6M),
.I_H_CNT(W_H_CNT),
.I_V_CNT(W_V_CNT),
.I_H_FLIP(W_H_FLIP),
.I_V_FLIP(W_V_FLIP),
.I_V_BLn(W_V_BLn),
.I_C_BLn(W_C_BLn),

.I_A(W_A[9:0]),
.I_OBJ_SUB_A(3'b000),
.I_BD(W_BDI),
.I_OBJ_RAM_RQn(W_OBJ_RAM_RQn),
.I_OBJ_RAM_RDn(W_OBJ_RAM_RDn),
.I_OBJ_RAM_WRn(W_OBJ_RAM_WRn),
.I_VID_RAM_RDn(W_VID_RAM_RDn),
.I_VID_RAM_WRn(W_VID_RAM_WRn),

.O_C_BLnX(W_C_BLnX),
.O_8HF(W_8HF),
.O_256HnX(W_256HnX),
.O_1VF(W_1VF),
.O_MISSILEn(W_MISSILEn),
.O_SHELLn(W_SHELLn),
.O_BD(W_VID_DO),
.O_VID(W_VID),
.O_COL(W_COL)

);

wire   W_C_BLX;
wire   W_STARS_OFFn;
wire   [2:0]W_VIDEO_R;
wire   [2:0]W_VIDEO_G;
wire   [1:0]W_VIDEO_B;

mc_col_pal MC_COL_PAL(

.I_CLK_12M(W_CLK_12M),
.I_CLK_6M(W_CLK_6M),
.I_VID(W_VID),
.I_COL(W_COL),
.I_C_BLnX(W_C_BLnX),

.O_C_BLX(W_C_BLX),
.O_STARS_OFFn(W_STARS_OFFn),
.O_R(W_VIDEO_R),
.O_G(W_VIDEO_G),
.O_B(W_VIDEO_B)

);

wire   [2:0]W_STARS_R;
wire   [2:0]W_STARS_G;
wire   [1:0]W_STARS_B;

mc_stars MC_STARS( 

.I_CLK_18M(W_CLK_18M),
`ifdef DEVICE_CYCLONE
.I_CLK_6M(~WB_CLK_6M),
`endif
`ifdef DEVICE_SPARTAN2E 
.I_CLK_6M(WB_CLK_6M),   
`endif
.I_H_FLIP(W_H_FLIP),
.I_V_SYNC(W_V_SYNC),
.I_8HF(W_8HF),
.I_256HnX(W_256HnX),
.I_1VF(W_1VF),
.I_2V(W_V_CNT[1]),
.I_STARS_ON(W_STARS_ON),
.I_STARS_OFFn(W_STARS_OFFn),

.O_R(W_STARS_R),
.O_G(W_STARS_G),
.O_B(W_STARS_B),
.O_NOISE()

);

wire   [2:0]W_R;
wire   [2:0]W_G;
wire   [1:0]W_B;

mc_vedio_mix MIX(

.I_VID_R(W_VIDEO_R),
.I_VID_G(W_VIDEO_G),
.I_VID_B(W_VIDEO_B),
.I_STR_R(W_STARS_R),
.I_STR_G(W_STARS_G),
.I_STR_B(W_STARS_B),

.I_C_BLnXX(~W_C_BLX),
.I_C_BLX(W_C_BLX | ~W_V_BL2n),
.I_MISSILEn(W_MISSILEn),
.I_SHELLn(W_SHELLn),

.O_R(W_R),
.O_G(W_G),
.O_B(W_B)

);

wire [2:0]W_VGA_R;
wire [2:0]W_VGA_G;
wire [1:0]W_VGA_B;

`ifdef VGA_USE
mc_vga_if  VGA(

// input
.I_CLK_1(W_CLK_6M),
.I_CLK_2(W_CLK_12M),
.I_R(W_R),
.I_G(W_G),
.I_B(W_B),
.I_H_SYNC(W_H_SYNC),
.I_V_SYNC(W_V_SYNC),
// output
.O_R(W_VGA_R),
.O_G(W_VGA_G),
.O_B(W_VGA_B),
.O_H_SYNCn(O_VGA_H_SYNCn),
.O_V_SYNCn(O_VGA_V_SYNCn)

);

`else

assign W_VGA_R[2:0] = W_R;

assign W_VGA_G[2:0] = W_G;

assign W_VGA_B[1:0] = W_B;

//assign O_VGA_H_SYNCn = W_H_SYNC | W_V_SYNC ;  //  AKIDUKI LCD USED
assign O_VGA_H_SYNCn = ~W_H_SYNC ;
assign O_VGA_V_SYNCn = ~W_V_SYNC ;

`endif

assign O_VGA_R[3:0] = {W_VGA_R[0], W_VGA_R[1], W_VGA_R[2], 1'b0};

assign O_VGA_G[3:0] = {W_VGA_G[0], W_VGA_G[1], W_VGA_G[2], 1'b0};

assign O_VGA_B[3:0] = {W_VGA_B[0], W_VGA_B[1], 2'b0};

wire   [7:0]W_SDAT_A;

mc_sound_a MC_SOUND_A(

.I_CLK_12M(W_CLK_12M),
.I_CLK_6M(W_CLK_6M),
.I_H_CNT1(W_H_CNT[1]),
.I_BD(W_BDI),
.I_PITCHn(W_PITCHn),
.I_VOL1(W_VOL1),
.I_VOL2(W_VOL2),

.O_SDAT(W_SDAT_A),
.O_DO()

);

wire   [7:0]W_SDAT_B;

mc_sound_b MC_SOUND_B(

.I_CLK1(W_CLK_18M),
.I_CLK2(W_CLK_6M),
.I_RSTn(rst_count[3]),
.I_SW({&on_game[1:0],W_HIT,W_FIRE}),

.O_WAV_A0(W_WAV_A0),
.O_WAV_A1(W_WAV_A1),
.O_WAV_A2(W_WAV_A2),
.I_WAV_D0(W_WAV_D0),
.I_WAV_D1(W_WAV_D1),
.I_WAV_D2(W_WAV_D2),

.O_SDAT(W_SDAT_B)

);

wire    W_DAC_A;
wire    W_DAC_B;

assign  O_SOUND_OUT_L = W_DAC_A;
assign  O_SOUND_OUT_R = W_DAC_B;

dac wav_dac_a(

.Clk(W_CLK_18M), 
.Reset(~W_RESETn),
.DACin(W_SDAT_A),
.DACout(W_DAC_A)

);

dac wav_dac_b(

.Clk(W_CLK_18M), 
.Reset(~W_RESETn),
.DACin(W_SDAT_B),
.DACout(W_DAC_B)

);


endmodule