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MegaCD.sv
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//============================================================================
// FPGAGen port to MiSTer
// Copyright (c) 2017-2019 Sorgelig
//
// YM2612 implementation by Jose Tejada Gomez. Twitter: @topapate
// Original Genesis code: Copyright (c) 2010-2013 Gregory Estrade ([email protected])
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//============================================================================
module emu
(
//Master input clock
input CLK_50M,
//Async reset from top-level module.
//Can be used as initial reset.
input RESET,
//Must be passed to hps_io module
inout [48:0] HPS_BUS,
//Base video clock. Usually equals to CLK_SYS.
output CLK_VIDEO,
//Multiple resolutions are supported using different CE_PIXEL rates.
//Must be based on CLK_VIDEO
output CE_PIXEL,
//Video aspect ratio for HDMI. Most retro systems have ratio 4:3.
//if VIDEO_ARX[12] or VIDEO_ARY[12] is set then [11:0] contains scaled size instead of aspect ratio.
output [12:0] VIDEO_ARX,
output [12:0] VIDEO_ARY,
output [7:0] VGA_R,
output [7:0] VGA_G,
output [7:0] VGA_B,
output VGA_HS,
output VGA_VS,
output VGA_DE, // = ~(VBlank | HBlank)
output VGA_F1,
output [1:0] VGA_SL,
output VGA_SCALER, // Force VGA scaler
output VGA_DISABLE, // analog out is off
input [11:0] HDMI_WIDTH,
input [11:0] HDMI_HEIGHT,
output HDMI_FREEZE,
`ifdef MISTER_FB
// Use framebuffer in DDRAM
// FB_FORMAT:
// [2:0] : 011=8bpp(palette) 100=16bpp 101=24bpp 110=32bpp
// [3] : 0=16bits 565 1=16bits 1555
// [4] : 0=RGB 1=BGR (for 16/24/32 modes)
//
// FB_STRIDE either 0 (rounded to 256 bytes) or multiple of pixel size (in bytes)
output FB_EN,
output [4:0] FB_FORMAT,
output [11:0] FB_WIDTH,
output [11:0] FB_HEIGHT,
output [31:0] FB_BASE,
output [13:0] FB_STRIDE,
input FB_VBL,
input FB_LL,
output FB_FORCE_BLANK,
`ifdef MISTER_FB_PALETTE
// Palette control for 8bit modes.
// Ignored for other video modes.
output FB_PAL_CLK,
output [7:0] FB_PAL_ADDR,
output [23:0] FB_PAL_DOUT,
input [23:0] FB_PAL_DIN,
output FB_PAL_WR,
`endif
`endif
output LED_USER, // 1 - ON, 0 - OFF.
// b[1]: 0 - LED status is system status OR'd with b[0]
// 1 - LED status is controled solely by b[0]
// hint: supply 2'b00 to let the system control the LED.
output [1:0] LED_POWER,
output [1:0] LED_DISK,
// I/O board button press simulation (active high)
// b[1]: user button
// b[0]: osd button
output [1:0] BUTTONS,
input CLK_AUDIO, // 24.576 MHz
output [15:0] AUDIO_L,
output [15:0] AUDIO_R,
output AUDIO_S, // 1 - signed audio samples, 0 - unsigned
output [1:0] AUDIO_MIX, // 0 - no mix, 1 - 25%, 2 - 50%, 3 - 100% (mono)
//ADC
inout [3:0] ADC_BUS,
//SD-SPI
output SD_SCK,
output SD_MOSI,
input SD_MISO,
output SD_CS,
input SD_CD,
//High latency DDR3 RAM interface
//Use for non-critical time purposes
output DDRAM_CLK,
input DDRAM_BUSY,
output [7:0] DDRAM_BURSTCNT,
output [28:0] DDRAM_ADDR,
input [63:0] DDRAM_DOUT,
input DDRAM_DOUT_READY,
output DDRAM_RD,
output [63:0] DDRAM_DIN,
output [7:0] DDRAM_BE,
output DDRAM_WE,
//SDRAM interface with lower latency
output SDRAM_CLK,
output SDRAM_CKE,
output [12:0] SDRAM_A,
output [1:0] SDRAM_BA,
inout [15:0] SDRAM_DQ,
output SDRAM_DQML,
output SDRAM_DQMH,
output SDRAM_nCS,
output SDRAM_nCAS,
output SDRAM_nRAS,
output SDRAM_nWE,
`ifdef MISTER_DUAL_SDRAM
//Secondary SDRAM
//Set all output SDRAM_* signals to Z ASAP if SDRAM2_EN is 0
input SDRAM2_EN,
output SDRAM2_CLK,
output [12:0] SDRAM2_A,
output [1:0] SDRAM2_BA,
inout [15:0] SDRAM2_DQ,
output SDRAM2_nCS,
output SDRAM2_nCAS,
output SDRAM2_nRAS,
output SDRAM2_nWE,
`endif
input UART_CTS,
output UART_RTS,
input UART_RXD,
output UART_TXD,
output UART_DTR,
input UART_DSR,
// Open-drain User port.
// 0 - D+/RX
// 1 - D-/TX
// 2..6 - USR2..USR6
// Set USER_OUT to 1 to read from USER_IN.
input [6:0] USER_IN,
output [6:0] USER_OUT,
input OSD_STATUS
);
assign ADC_BUS = 'Z;
assign {UART_RTS, UART_TXD, UART_DTR} = 0;
assign BUTTONS = {bk_reload, 1'b0};
assign {SD_SCK, SD_MOSI, SD_CS} = 'Z;
assign LED_DISK = {1'b1,MCD_LED_RED};
assign LED_POWER = {1'b1,MCD_LED_GREEN};
assign LED_USER = rom_download | sav_pending;
assign VGA_SCALER= 0;
assign VGA_DISABLE = 0;
assign HDMI_FREEZE = 0;
assign AUDIO_S = 1;
assign AUDIO_MIX = 0;
wire [1:0] ar = status[50:49];
wire [7:0] arx,ary;
always_comb begin
case(res) // {V30, H40}
2'b00: begin // 256 x 224
arx = 8'd64;
ary = 8'd49;
end
2'b01: begin // 320 x 224
arx = status[30] ? 8'd10: 8'd64;
ary = status[30] ? 8'd7 : 8'd49;
end
2'b10: begin // 256 x 240
arx = 8'd128;
ary = 8'd105;
end
2'b11: begin // 320 x 240
arx = status[30] ? 8'd4 : 8'd128;
ary = status[30] ? 8'd3 : 8'd105;
end
endcase
end
wire vcrop_en = status[32];
wire [3:0] vcopt = status[54:51];
reg en216p;
reg [4:0] voff;
always @(posedge CLK_VIDEO) begin
en216p <= ((HDMI_WIDTH == 1920) && (HDMI_HEIGHT == 1080) && !forced_scandoubler && !scale);
voff <= (vcopt < 6) ? {vcopt,1'b0} : ({vcopt,1'b0} - 5'd24);
end
wire vga_de;
video_freak video_freak
(
.*,
.VGA_DE_IN(vga_de),
.ARX((!ar) ? arx : (ar - 1'd1)),
.ARY((!ar) ? ary : 12'd0),
.CROP_SIZE((en216p & vcrop_en) ? 10'd216 : 10'd0),
.CROP_OFF(voff),
.SCALE(status[56:55])
);
///////////////////////////////////////////////////
wire clk_sys, clk_ram, locked;
pll pll
(
.refclk(CLK_50M),
.rst(0),
.outclk_0(clk_ram),
.outclk_1(clk_sys),
.reconfig_to_pll(reconfig_to_pll),
.reconfig_from_pll(reconfig_from_pll),
.locked(locked)
);
wire [63:0] reconfig_to_pll;
wire [63:0] reconfig_from_pll;
wire cfg_waitrequest;
reg cfg_write;
reg [5:0] cfg_address;
reg [31:0] cfg_data;
pll_cfg pll_cfg
(
.mgmt_clk(CLK_50M),
.mgmt_reset(0),
.mgmt_waitrequest(cfg_waitrequest),
.mgmt_read(0),
.mgmt_readdata(),
.mgmt_write(cfg_write),
.mgmt_address(cfg_address),
.mgmt_writedata(cfg_data),
.reconfig_to_pll(reconfig_to_pll),
.reconfig_from_pll(reconfig_from_pll)
);
always @(posedge CLK_50M) begin
reg pald = 0, pald2 = 0;
reg [2:0] state = 0;
reg pal_r;
pald <= PAL;
pald2 <= pald;
cfg_write <= 0;
if(pald2 == pald && pald2 != pal_r) begin
state <= 1;
pal_r <= pald2;
end
if(!cfg_waitrequest) begin
if(state) state<=state+1'd1;
case(state)
1: begin
cfg_address <= 0;
cfg_data <= 0;
cfg_write <= 1;
end
5: begin
cfg_address <= 7;
cfg_data <= pal_r ? 2201376125 : 2537930535;
cfg_write <= 1;
end
7: begin
cfg_address <= 2;
cfg_data <= 0;
cfg_write <= 1;
end
endcase
end
end
// Status Bit Map:
// Upper Lower
// 0 1 2 3 4 5 6
// 01234567890123456789012345678901 23456789012345678901234567890123
// 0123456789ABCDEFGHIJKLMNOPQRSTUV 0123456789ABCDEFGHIJKLMNOPQRSTUV
// XXXXXXXXX XXXXXXXXXXXXXXXXXX XXX XXXXXXXXXXXXXXXXXXXXXXXXXXX
`include "build_id.v"
localparam CONF_STR = {
"MegaCD;;",
"S0,CUECHD,Insert Disk;",
"-;",
"h6O67,Region,Auto(JP),JP,US,EU;",
"h7O67,Region,Auto(US),JP,US,EU;",
"h8O67,Region,Auto(EU),JP,US,EU;",
"-;",
"C,Cheats;",
"H5OO,Cheats Enabled,Yes,No;",
"-;",
"O3,Backup RAM,Internal,Internal+Cart;",
"D0RG,Reload Backup RAM;",
"D0RH,Save Backup RAM;",
"D0OD,Autosave,No,Yes;",
"-;",
"P1,Audio & Video;",
"P1-;",
"P1oHI,Aspect ratio,Original,Full Screen,[ARC1],[ARC2];",
"P1OU,320x224 Aspect,Original,Corrected;",
"P1o13,Scandoubler Fx,None,HQ2x,CRT 25%,CRT 50%,CRT 75%;",
"P1-;",
"d9P1o0,Vertical Crop,Disabled,216p(5x);",
"d9P1oJM,Crop Offset,0,2,4,8,10,12,-12,-10,-8,-6,-4,-2;",
"P1oNO,Scale,Normal,V-Integer,Narrower HV-Integer,Wider HV-Integer;",
"P1- ;",
"P1OT,Border,No,Yes;",
"P1oFG,Composite Blend,Off,On,Adaptive;",
"P1OA,CRAM Dots,Off,On;",
"P1OV,Sprite Limit,Normal,High;",
"P1-;",
"P1OEF,Audio Filter,Model 1,Model 2,Minimal,No Filter;",
"P1OR,CD Audio,Unfiltered,Filtered;",
"P1oPQ,Audio Boost,No,2x,4x;",
"P1O8,FM Chip,YM2612,YM3438;",
"P1ON,HiFi PCM,No,Yes;",
"P2,Input;",
"P2-;",
"P2O4,Swap Joysticks,No,Yes;",
"P2O5,6 Buttons Mode,No,Yes;",
"P2OLM,Multitap,Disabled,4-Way,TeamPlayer: Port1,TeamPlayer: Port2;",
"P2-;",
"P2OIJ,Mouse,None,Port1,Port2;",
"P2OK,Mouse Flip Y,No,Yes;",
"P2-;",
"P2o89,Gun Control,Disabled,Joy1,Joy2,Mouse;",
"D4P2oA,Gun Fire,Joy,Mouse;",
"D4P2oBC,Cross,Small,Medium,Big,None;",
"D4P2oD,Gun Type,Justifier,Menacer;",
"P2-;",
"P2oE,Serial,OFF,SNAC;",
"-;",
"H2OB,Enable FM,Yes,No;",//11
"H2OC,Enable PSG,Yes,No;",//12
"H2OP,Enable PCM,Yes,No;",//25
"H2OQ,Enable CDDA,Yes,No;",//26
"H2o4,Enable BGA,Yes,No;",//36
"H2o5,Enable BGB,Yes,No;",//37
"H2o6,Enable SPR,Yes,No;",//38
"H2o7,MCD RAM,Banks 2&3,Banks 0&1;",//39
"H2-;",
//"R1,Reset;"
"R0,Reset & Eject CD;",
"J1,A,B,C,Start,Mode,X,Y,Z;",
"jn,A,B,R,Start,Select,X,Y,L;", // name map to SNES layout.
"jp,Y,B,A,Start,Select,L,X,R;", // positional map to SNES layout (3 button friendly)
"V,v",`BUILD_DATE
};
wire [15:0] status_menumask = {en216p,region,!region,~gg_available,!gun_mode,1'b1,~dbg_menu,1'b0,~bk_ena};
wire [63:0] status;
wire [1:0] buttons;
wire [11:0] joystick_0,joystick_1,joystick_2,joystick_3,joystick_4;
wire [7:0] joy0_x,joy0_y,joy1_x,joy1_y;
wire ioctl_download;
wire ioctl_wr;
wire [24:0] ioctl_addr;
wire [15:0] ioctl_data;
wire [7:0] ioctl_index;
reg ioctl_wait;
reg [31:0] sd_lba[1];
reg sd_rd = 0;
reg sd_wr = 0;
wire sd_ack;
wire [7:0] sd_buff_addr;
wire [15:0] sd_buff_dout;
wire [15:0] sd_buff_din[1];
wire sd_buff_wr;
wire img_mounted;
wire img_readonly;
wire [63:0] img_size;
wire forced_scandoubler;
wire [10:0] ps2_key;
wire [24:0] ps2_mouse;
wire [21:0] gamma_bus;
wire [1:0] gun_mode = status[41:40];
wire gun_btn_mode = status[42];
wire gun_type = ~status[45];
assign sd_buff_din[0] = sd_lba[0][10:4] ? tmpram_sd_buff_data : bram_sd_buff_data;
hps_io #(.CONF_STR(CONF_STR), .WIDE(1)) hps_io
(
.clk_sys(clk_sys),
.HPS_BUS(HPS_BUS),
.joystick_0(joystick_0),
.joystick_1(joystick_1),
.joystick_2(joystick_2),
.joystick_3(joystick_3),
.joystick_4(joystick_4),
.joystick_l_analog_0({joy0_y, joy0_x}),
.joystick_l_analog_1({joy1_y, joy1_x}),
.buttons(buttons),
.forced_scandoubler(forced_scandoubler),
.new_vmode(new_vmode),
.status(status),
.status_in({status[63:8],2'b00,status[5:0]}),
.status_set(region_reset),
.status_menumask(status_menumask),
.ioctl_download(ioctl_download),
.ioctl_index(ioctl_index),
.ioctl_wr(ioctl_wr),
.ioctl_addr(ioctl_addr),
.ioctl_dout(ioctl_data),
.ioctl_wait(ioctl_wait),
.sd_lba(sd_lba),
.sd_rd(sd_rd),
.sd_wr(sd_wr),
.sd_ack(sd_ack),
.sd_buff_addr(sd_buff_addr),
.sd_buff_dout(sd_buff_dout),
.sd_buff_din(sd_buff_din),
.sd_buff_wr(sd_buff_wr),
.img_mounted(img_mounted),
.img_readonly(img_readonly),
.img_size(img_size),
.gamma_bus(gamma_bus),
.ps2_key(ps2_key),
.ps2_mouse(ps2_mouse),
.EXT_BUS(EXT_BUS)
);
wire [35:0] EXT_BUS;
hps_ext hps_ext
(
.clk_sys(clk_sys),
.EXT_BUS(EXT_BUS),
.cd_data_ready(1),
.cdda_ready(MCD_CDDA_WR_READY),
.cd_in(cd_in),
.cd_out(cd_out)
);
reg dbg_menu = 0;
always @(posedge clk_sys) begin
reg old_stb;
reg enter = 0;
reg esc = 0;
old_stb <= ps2_key[10];
if(old_stb ^ ps2_key[10]) begin
if(ps2_key[7:0] == 'h5A) enter <= ps2_key[9];
if(ps2_key[7:0] == 'h76) esc <= ps2_key[9];
end
if(enter & esc) begin
dbg_menu <= ~dbg_menu;
enter <= 0;
esc <= 0;
end
end
wire rom_download = ioctl_download & (ioctl_index[5:0] <= 6'h01);
wire cdc_dat_download = ioctl_download & (ioctl_index[5:0] == 6'h02);
wire cdc_sub_download = ioctl_download & (ioctl_index[5:0] == 6'h03);
wire cdc_cdda_download = ioctl_download & (ioctl_index[5:0] == 6'h04);
wire save_download = ioctl_download & (ioctl_index[5:0] == 6'h05);
wire code_download = ioctl_download & &ioctl_index;
wire reset = RESET | status[0] | buttons[1] | region_set;
///////////////////////////////////////////////////
// Code loading for WIDE IO (16 bit)
reg [128:0] gg_code;
wire gg_available = gg_available1 | gg_available2;
// Code layout:
// {clock bit, code flags, 32'b address, 32'b compare, 32'b replace}
// 128 127:96 95:64 63:32 31:0
// Integer values are in BIG endian byte order, so it up to the loader
// or generator of the code to re-arrange them correctly.
always_ff @(posedge clk_sys) begin
gg_code[128] <= 0;
if (code_download & ioctl_wr) begin
case (ioctl_addr[3:0])
0: gg_code[111:96] <= ioctl_data; // Flags Bottom Word
2: gg_code[127:112] <= ioctl_data; // Flags Top Word
4: gg_code[79:64] <= ioctl_data; // Address Bottom Word
6: gg_code[95:80] <= ioctl_data; // Address Top Word
8: gg_code[47:32] <= ioctl_data; // Compare Bottom Word
10: gg_code[63:48] <= ioctl_data; // Compare top Word
12: gg_code[15:0] <= ioctl_data; // Replace Bottom Word
14: begin
gg_code[31:16] <= ioctl_data; // Replace Top Word
gg_code[128] <= 1; // Clock it in
end
endcase
end
end
//Genesis
wire [23:1] GEN_VA;
wire [15:0] GEN_VDI, GEN_VDO;
wire GEN_RNW, GEN_LDS_N, GEN_UDS_N;
wire GEN_AS_N, GEN_DTACK_N, GEN_ASEL_N;
wire GEN_RAS2_N;
wire EXT_ROM_N;
wire EXT_FDC_N;
wire GEN_VCLK_CE;
wire GEN_CE0_N;
wire GEN_WRL_N, GEN_WRH_N, GEN_OE_N;
wire GEN_ROM_CE_N;
wire GEN_RAM_CE_N;
wire GEN_PAGE_CE_N;
wire [15:0] GEN_MEM_DO;
wire GEN_MEM_BUSY;
wire [15:0] GEN_AUDL;
wire [15:0] GEN_AUDR;
wire [7:0] color_lut[16] = '{
8'd0, 8'd27, 8'd49, 8'd71,
8'd87, 8'd103, 8'd119, 8'd130,
8'd146, 8'd157, 8'd174, 8'd190,
8'd206, 8'd228, 8'd255, 8'd255
};
wire [3:0] r, g, b;
wire vs,hs;
wire ce_pix;
wire hblank, vblank;
wire interlace;
wire [1:0] resolution;
wire EN_GEN_FM = ~status[11] | ~dbg_menu;
wire EN_GEN_PSG = ~status[12] | ~dbg_menu;
wire EN_MCD_PCM = ~status[25] | ~dbg_menu;
wire EN_MCD_CDDA = ~status[26] | ~dbg_menu;
wire EN_VDP_BGA = ~status[36] | ~dbg_menu;
wire EN_VDP_BGB = ~status[37] | ~dbg_menu;
wire EN_VDP_SPR = ~status[38] | ~dbg_menu;
wire MCD_BANK23 = ~status[39] | ~dbg_menu;
wire gg_available1;
gen gen
(
.RESET_N(~reset),
.MCLK(clk_sys),
.VA(GEN_VA),
.VDI(GEN_VDI),
.VDO(GEN_VDO),
.RNW(GEN_RNW),
.LDS_N(GEN_LDS_N),
.UDS_N(GEN_UDS_N),
.AS_N(GEN_AS_N),
.DTACK_N(GEN_DTACK_N),
.ASEL_N(GEN_ASEL_N),
.VCLK_CE(GEN_VCLK_CE),
.CE0_N(GEN_CE0_N),
.RAS2_N(GEN_RAS2_N),
.ROM_N(EXT_ROM_N),
.FDC_N(EXT_FDC_N),
.CART_N(CART_CART_N),
.DISK_N(0),
.WRL_N(GEN_WRL_N),
.WRH_N(GEN_WRH_N),
.OE_N(GEN_OE_N),
.TIME_N(GEN_PAGE_CE_N),
.TIME_DI(GEN_PAGE_DI),
.LOADING(rom_download),
.EXPORT(|region),
.PAL(PAL),
.EXT_SL(mcd_l),
.EXT_SR(mcd_r),
.EXT_EN(status[27]),
.DAC_LDATA(GEN_AUDL),
.DAC_RDATA(GEN_AUDR),
.RED(r),
.GREEN(g),
.BLUE(b),
.VS(vs),
.HS(hs),
.HBL(hblank),
.VBL(vblank),
.BORDER(status[29]),
.CRAM_DOTS(status[10]),
.CE_PIX(ce_pix),
.FIELD(VGA_F1),
.INTERLACE(interlace),
.RESOLUTION(resolution),
.EN_BGA(EN_VDP_BGA),
.EN_BGB(EN_VDP_BGB),
.EN_SPR(EN_VDP_SPR),
.J3BUT(~status[5]),
.JOY_1(status[4] ^ status[46] ? joystick_1 : joystick_0),
.JOY_2(status[4] ^ status[46] ? joystick_0 : joystick_1),
.JOY_3(joystick_2),
.JOY_4(joystick_3),
.JOY_5(joystick_4),
.MULTITAP(status[22:21]),
.MOUSE(ps2_mouse),
.MOUSE_OPT(status[20:18]),
.GUN_OPT(|gun_mode),
.GUN_TYPE(gun_type),
.GUN_SENSOR(lg_sensor),
.GUN_A(lg_a),
.GUN_B(lg_b),
.GUN_C(lg_c),
.GUN_START(lg_start),
.SERJOYSTICK_IN(SERJOYSTICK_IN),
.SERJOYSTICK_OUT(SERJOYSTICK_OUT),
.SER_OPT(SER_OPT),
.ENABLE_FM(EN_GEN_FM),
.ENABLE_PSG(EN_GEN_PSG),
.EN_HIFI_PCM(status[23]), // Option "N"
.LADDER(~status[8]),
.LPF_MODE(status[15:14]),
.OBJ_LIMIT_HIGH(status[31]),
.RAM_CE_N(GEN_RAM_CE_N),
.RAM_RDY(~GEN_MEM_BUSY),
.TRANSP_DETECT(TRANSP_DETECT),
.GG_RESET(code_download && ioctl_wr && !ioctl_addr),
.GG_EN(status[24]),
.GG_CODE({~gg_code[95] & gg_code[128], gg_code[127:0]}),
.GG_AVAILABLE(gg_available1)
);
wire TRANSP_DETECT;
wire cofi_enable = status[47] || (status[48] && TRANSP_DETECT);
assign GEN_VDI = !GEN_RAM_CE_N ? GEN_MEM_DO_R :
!CART_DTACK_N ? CART_DO :
MCD_DO;
assign GEN_DTACK_N = MCD_DTACK_N & CART_DTACK_N;
reg [15:0] GEN_MEM_DO_R;
always @(posedge clk_sys) begin
reg old_bsy;
old_bsy <= GEN_MEM_BUSY;
if(old_bsy & ~GEN_MEM_BUSY) GEN_MEM_DO_R <= GEN_MEM_DO;
end
// MCD
wire [15:0] MCD_DO;
wire MCD_DTACK_N;
wire [15:0] MCD_PCM_SL;
wire [15:0] MCD_PCM_SR;
wire [15:0] MCD_CDDA_SL;
wire [15:0] MCD_CDDA_SR;
wire MCD_CDDA_WR_READY;
wire [17:0] MCD_PRG_ADDR;
wire [15:0] MCD_PRG_DO;
wire [15:0] MCD_PRG_DI;
wire MCD_PRG_OE_N;
wire MCD_PRG_WRL_N;
wire MCD_PRG_WRH_N;
wire MCD_PRG_BUSY;
wire [13:1] MCD_BRAM_ADDR;
wire [7:0] MCD_BRAM_DO;
wire [7:0] MCD_BRAM_DI;
wire MCD_BRAM_WE;
wire MCD_LED_RED;
wire MCD_LED_GREEN;
wire MCD_RST_N;
wire gg_available2;
MCD MCD
(
.RST_N(~(reset|rom_download)),
.CLK(clk_sys),
.ENABLE(1),
.MCD_RST_N(MCD_RST_N),
.PALSW(PAL),
.EXT_VA(GEN_VA[17:1]),
.EXT_VDI(GEN_VDO),
.EXT_VDO(MCD_DO),
.EXT_AS_N(GEN_AS_N),
.EXT_RNW(GEN_RNW),
.EXT_LDS_N(GEN_LDS_N),
.EXT_UDS_N(GEN_UDS_N),
.EXT_DTACK_N(MCD_DTACK_N),
.EXT_ASEL_N(GEN_ASEL_N),
.EXT_VCLK_CE(GEN_VCLK_CE),
.EXT_RAS2_N(GEN_RAS2_N),
.EXT_ROM_N(EXT_ROM_N),
.EXT_FDC_N(EXT_FDC_N),
.PRG_A(MCD_PRG_ADDR),
.PRG_DI(MCD_PRG_DI),
.PRG_DO(MCD_PRG_DO),
.PRG_WRL_N(MCD_PRG_WRL_N),
.PRG_WRH_N(MCD_PRG_WRH_N),
.PRG_OE_N(MCD_PRG_OE_N),
.PRG_RDY(~MCD_PRG_BUSY),
.ROM_DI(GEN_MEM_DO),
.ROM_CE_N(GEN_ROM_CE_N),
.ROM_RDY(~GEN_MEM_BUSY),
.BRAM_A(MCD_BRAM_ADDR),
.BRAM_DI(MCD_BRAM_DI),
.BRAM_DO(MCD_BRAM_DO),
.BRAM_WE(MCD_BRAM_WE),
.CDD_STAT(scd_cdd_stat),
.CDD_COMM(scd_cdd_comm),
.CDD_SEND(scd_cdd_send),
.CDD_REC(scd_cdd_rec),
.CDD_DM(scd_cdd_dm),
.CDC_DATA(cdc_d),
.CDC_DAT_WR(cdc_wr & (cdc_dat_download | cdc_cdda_download)),
.CDC_SC_WR(cdc_wr & cdc_sub_download),
.CDC_CDDA_WR(cdc_wr & cdc_cdda_download),
.CDDA_WR_READY(MCD_CDDA_WR_READY),
.PCM_SL(MCD_PCM_SL),
.PCM_SR(MCD_PCM_SR),
.CDDA_SL(MCD_CDDA_SL),
.CDDA_SR(MCD_CDDA_SR),
.LED_RED(MCD_LED_RED),
.LED_GREEN(MCD_LED_GREEN),
.GG_RESET(code_download && ioctl_wr && !ioctl_addr),
.GG_EN(status[24]),
.GG_CODE({gg_code[95] & gg_code[128], gg_code[127:0]}),
.GG_AVAILABLE(gg_available2)
);
localparam [3:0] comp_f1 = 4;
localparam [3:0] comp_a1 = 2;
localparam comp_x1 = ((32767 * (comp_f1 - 1)) / ((comp_f1 * comp_a1) - 1)) + 1; // +1 to make sure it won't overflow
localparam comp_b1 = comp_x1 * comp_a1;
localparam [3:0] comp_f2 = 8;
localparam [3:0] comp_a2 = 4;
localparam comp_x2 = ((32767 * (comp_f2 - 1)) / ((comp_f2 * comp_a2) - 1)) + 1; // +1 to make sure it won't overflow
localparam comp_b2 = comp_x2 * comp_a2;
function [15:0] compr; input [15:0] inp;
reg [15:0] v, v1, v2;
begin
v = inp[15] ? (~inp) + 1'd1 : inp;
v1 = (v < comp_x1[15:0]) ? (v * comp_a1) : (((v - comp_x1[15:0])/comp_f1) + comp_b1[15:0]);
v2 = (v < comp_x2[15:0]) ? (v * comp_a2) : (((v - comp_x2[15:0])/comp_f2) + comp_b2[15:0]);
v = status[58] ? v2 : v1;
compr = inp[15] ? ~(v-1'd1) : v;
end
endfunction
reg [15:0] aud_l, aud_r;
reg [15:0] cmp_l, cmp_r;
reg [15:0] mcd_l, mcd_r;
always @(posedge clk_sys) begin
mcd_l <= ({16{EN_MCD_PCM}} & {MCD_PCM_SL[15],MCD_PCM_SL[15:1]}) + ({16{EN_MCD_CDDA}} & {MCD_CDDA_SL[15],MCD_CDDA_SL[15:1]});
mcd_r <= ({16{EN_MCD_PCM}} & {MCD_PCM_SR[15],MCD_PCM_SR[15:1]}) + ({16{EN_MCD_CDDA}} & {MCD_CDDA_SR[15],MCD_CDDA_SR[15:1]});
if(~status[27]) begin
aud_l <= {GEN_AUDL[15],GEN_AUDL[15:1]} + {mcd_l[15],mcd_l[15:1]};
aud_r <= {GEN_AUDR[15],GEN_AUDR[15:1]} + {mcd_r[15],mcd_r[15:1]};
end
else begin
aud_l <= GEN_AUDL;
aud_r <= GEN_AUDR;
end
cmp_l <= compr(aud_l);
cmp_r <= compr(aud_r);
end
assign AUDIO_L = status[58:57] ? cmp_l : aud_l;
assign AUDIO_R = status[58:57] ? cmp_r : aud_r;
//ROM/RAM Cart
wire [15:0] CART_DO;
wire CART_DTACK_N;
wire CART_CART_N;
wire CART_ROM_CE_N;
wire CART_RAM_CE_N;
wire [15:0] CART_ROM_DO;
wire CART_ROM_BUSY;
wire CART_EN = status[3];
CART CART
(
.RST_N(~reset),
.CLK(clk_sys),
.ENABLE(1),
.ROM_MODE(rom_cart_mode),
.RAM_ID(CART_EN ? 8'd6 : 8'd255), //backup ram size = (1<<n)*8192, n=0..6, when n=255 ram is not present
.VA(GEN_VA),
.VDI(GEN_VDO),
.VDO(CART_DO),
.AS_N(GEN_AS_N),
.RNW(GEN_RNW),
.LDS_N(GEN_LDS_N),
.UDS_N(GEN_UDS_N),
.DTACK_N(CART_DTACK_N),
.ASEL_N(GEN_ASEL_N),
.VCLK_CE(GEN_VCLK_CE),
.CE0_N(GEN_CE0_N),
.CART_N(CART_CART_N),
.ROM_CE_N(CART_ROM_CE_N),
.ROM_DI(PIER_HOOK ? PIER_DATA : GEN_MEM_DO),
.ROM_RDY(~GEN_MEM_BUSY),
.RAM_CE_N(CART_RAM_CE_N),
.RAM_DI(GEN_MEM_DO),
.RAM_RDY(~GEN_MEM_BUSY)
);
always @(posedge clk_sys) begin
reg old_busy;
old_busy <= tmpram_busy;
if(rom_download & ioctl_wr) ioctl_wait <= 1;
if(old_busy & ~tmpram_busy) ioctl_wait <= 0;
end
wire use_sdr = 1;
assign MCD_PRG_BUSY = use_sdr ? sdr_busy : ddr_busy;
assign MCD_PRG_DI = use_sdr ? sdr_do : ddr_do;
wire ddr_busy;
wire [15:0] ddr_do;
assign DDRAM_CLK = clk_ram & ~use_sdr;
ddram ddram
(
.*,
.cache_rst(reset),
.mem_addr(MCD_PRG_ADDR),
.mem_dout(ddr_do),
.mem_din(MCD_PRG_DO),
.mem_rd(~use_sdr & ~MCD_PRG_OE_N),
.mem_wrl(~use_sdr & ~MCD_PRG_WRL_N),
.mem_wrh(~use_sdr & ~MCD_PRG_WRH_N),
.mem_busy(ddr_busy)
);
//MCD PRGRAM, GEN ROM/RAM/CART RAM
wire sdr_busy;
wire [15:0] sdr_do;
sdram sdram
(
.*,
.init(~locked),
.clk(clk_ram),
//MCD: banks 2,3
.addr0({(MCD_BANK23 ? 6'b100000 : 6'b011111),MCD_PRG_ADDR}), // 1000000-107FFFF / 0F80000-0FFFFFF
.din0(MCD_PRG_DO),
.dout0(sdr_do),
.rd0(use_sdr & ~MCD_PRG_OE_N),
.wrl0(use_sdr & ~MCD_PRG_WRL_N),
.wrh0(use_sdr & ~MCD_PRG_WRH_N),
.busy0(sdr_busy),
//Genesis: banks 0,1
.addr1(!GEN_RAM_CE_N ? {9'b010000000,GEN_VA[15:1]} : //WORK RAM 800000-80FFFF
!CART_RAM_CE_N ? {5'b01110,GEN_VA[19:1]} : //CART RAM E00000-EFFFFF
!CART_ROM_CE_N ? {2'b00,ROM_VA[22:1]} : //CART ROM 000000-7FFFFF
{8'b01111000,GEN_VA[16:1]} ), //BIOS ROM F00000-F1FFFF
.din1(GEN_VDO),
.dout1(GEN_MEM_DO),
.rd1((~GEN_RAM_CE_N | ~GEN_ROM_CE_N | ~CART_RAM_CE_N | ~CART_ROM_CE_N) & ~GEN_OE_N),
.wrl1((~GEN_RAM_CE_N | ~CART_RAM_CE_N) & ~GEN_WRL_N),
.wrh1((~GEN_RAM_CE_N | ~CART_RAM_CE_N) & ~GEN_WRH_N),
.busy1(GEN_MEM_BUSY),
//Load/Save: banks 0,1
.addr2( rom_download ? (rom_cart_mode ? {2'b00,ioctl_addr[22:1]} : {6'b011110,ioctl_addr[18:1]}) : //ROM 000000-7FFFFF/F00000-F7FFFF
{5'b01110,tmpram_lba[9:0],tmpram_addr}), //CART RAM E00000-EFFFFF for sd_*
.din2(rom_download ? {ioctl_data[7:0],ioctl_data[15:8]} : {tmpram_dout,tmpram_dout}),
.dout2(tmpram_din),
.rd2(~rom_download & tmpram_req & ~bk_loading),
.wrl2(rom_download ? ioctl_wait : (tmpram_req & bk_loading)),
.wrh2(rom_download ? ioctl_wait : (tmpram_req & bk_loading)),
.busy2(tmpram_busy)
);
wire [15:0] bram_sd_buff_data;
dpram_dif #(13,8,12,16) bram
(
.clock(clk_sys),
.address_a(PIER_QUIRK ? m95_addr : MCD_BRAM_ADDR),
.data_a(PIER_QUIRK ? m95_di : MCD_BRAM_DO),
.wren_a(PIER_QUIRK ? m95_we : MCD_BRAM_WE),
.q_a(MCD_BRAM_DI),
.address_b({sd_lba[0][3:0],sd_buff_addr}),
.data_b(sd_buff_dout),
.wren_b(sd_buff_wr & sd_ack & !sd_lba[0][10:4]),
.q_b(bram_sd_buff_data)
);
wire [7:0] tmpram_dout;
wire [7:0] tmpram_din;
wire tmpram_busy;
wire [15:0] tmpram_sd_buff_data;
dpram_dif #(9,8,8,16) tmpram
(
.clock(clk_sys),
.address_a(tmpram_addr),
.wren_a(~bk_loading & tmpram_busy_d & ~tmpram_busy),
.data_a(tmpram_din),
.q_a(tmpram_dout),
.address_b(sd_buff_addr),
.wren_b(sd_buff_wr & sd_ack & |sd_lba[0][10:4]),
.data_b(sd_buff_dout),
.q_b(tmpram_sd_buff_data)
);