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Amstrad.sv
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Amstrad.sv
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//============================================================================
// Amstrad CPC 6128
//
// Port to MiST/MiSTer.
// Copyright (C) 2018 Sorgelig
//
// 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 Amstrad
(
input SPI_DI,
input SPI_SCK,
input CONF_DATA0,
input SPI_SS2,
input SPI_SS3,
input [1:0] CLOCK_27,
output AUDIO_L,
output AUDIO_R,
output UART_TX,
input UART_RX,
output SDRAM_DQMH,
output SDRAM_DQML,
output SDRAM_CKE,
output SDRAM_nCS,
output SDRAM_nWE,
output SDRAM_nRAS,
output SDRAM_nCAS,
output SDRAM_CLK,
output LED,
output SPI_DO,
output VGA_HS,
output VGA_VS,
output [12:0] SDRAM_A,
output [1:0] SDRAM_BA,
inout [15:0] SDRAM_DQ,
output [5:0] VGA_B,
output [5:0] VGA_G,
output [5:0] VGA_R
);
//////////////////////////////////////////////////////////////////////////
assign LED = ~mf2_en & ~ioctl_download & ~(tape_motor & tape_motor_led);
`include "build_id.v"
localparam CONF_STR = {
"AMSTRAD;;",
"S0,DSK,Mount Disk A:;",
"S1,DSK,Mount Disk B:;",
"F,E??,Load expansion;",
"F,CDT,Load;",
"P1,Video & Audio;",
"P2,Controls;",
"P3,System;",
"P1O9A,Scandoubler Fx,None,CRT 25%,CRT 50%,CRT 75%;",
"P1OBD,Display,Color(GA),Color(ASIC),Green,Amber,Cyan,White;",
"P1O2,CRTC,Type 1,Type 0;",
"P1O3,Sync signals,Original,Filtered;",
"P1OK,Tape sound,Disabled,Enabled;",
"P1OL,Sound output,Stereo,Mono;",
"P1OO,Playcity,Disabled,Enabled;",
"P2OI,Joysticks swap,No,Yes;",
"P2OJ,Mouse,Disabled,Enabled;",
"P2OM,Right Shift,Backslash,Shift;",
"P2ON,Keypad,Numbers,Symbols;",
"P3OEF,Multiface 2,Enabled,Hidden,Disabled;",
"P3O6,CPU timings,Original,Fast;",
"P3OGH,FDC,Original,Fast,Disabled;",
"P3O5,Distributor,Amstrad,Schneider;",
"P3O4,Model,CPC 6128,CPC 664;",
"P3T0,Reset & apply model;",
"V,",`BUILD_DATE
};
wire [1:0] st_scanlines = status[10:9];
wire [2:0] st_palette = status[13:11];
wire st_sync_filter = status[3];
wire st_joyswap = status[18];
wire st_nowait = status[6];
wire st_cpc664 = status[4];
wire st_crtc = status[2];
wire st_distributor = status[5];
wire [1:0] st_fdc = status[17:16];
wire st_tape_sound = status[20];
wire st_stereo = ~status[21];
wire [1:0] st_mf2 = status[15:14];
wire st_mouse_en = status[19];
wire st_right_shift_mod = status[22];
wire st_keypad_mod = status[23];
wire st_playcity_ena = status[24];
//////////////////////////////////////////////////////////////////////////
wire clk_sys;
wire locked;
pll pll
(
.inclk0(CLOCK_27),
.c0(clk_sys),
.locked(locked)
);
reg ce_ref, ce_u765;
reg ce_boot;
reg ce_16;
always @(posedge clk_sys) begin
reg [3:0] div = 0;
div <= div + 1'd1;
ce_ref <= !div;
ce_boot <= !div;
ce_u765 <= !div[2:0]; //8 MHz
ce_16 <= !div[1:0]; //16 MHz
end
//////////////////////////////////////////////////////////////////////////
wire [31:0] sd_lba;
wire [1:0] sd_rd;
wire [1:0] sd_wr;
wire sd_ack;
wire [8:0] sd_buff_addr;
wire [7:0] sd_buff_dout;
wire [7:0] sd_buff_din;
wire sd_buff_wr;
wire [1:0] img_mounted;
wire [63:0] img_size;
wire img_readonly;
wire ioctl_wr;
wire [24:0] ioctl_addr;
wire [7:0] ioctl_dout;
wire ioctl_download;
wire [7:0] ioctl_index;
wire [23:0] ioctl_file_ext;
wire key_strobe;
wire key_pressed;
wire key_extended;
wire [7:0] key_code;
wire [8:0] mouse_x;
wire [8:0] mouse_y;
wire [7:0] mouse_flags;
wire mouse_strobe;
wire [24:0] ps2_mouse = { mouse_strobe_level, mouse_y[7:0], mouse_x[7:0], mouse_flags };
reg mouse_strobe_level;
always @(posedge clk_sys) if (mouse_strobe) mouse_strobe_level <= ~mouse_strobe_level;
wire [1:0] buttons;
wire [6:0] joy1;
wire [6:0] joy2;
wire [31:0] status;
wire scandoubler_disable;
wire ypbpr;
wire no_csync;
user_io #(.STRLEN($size(CONF_STR)>>3)) user_io
(
.clk_sys(clk_sys),
.clk_sd(clk_sys),
.conf_str(CONF_STR),
.SPI_CLK(SPI_SCK),
.SPI_SS_IO(CONF_DATA0),
.SPI_MOSI(SPI_DI),
.SPI_MISO(SPI_DO),
.img_mounted(img_mounted),
.img_size(img_size),
.sd_conf(0),
.sd_sdhc(1),
.sd_lba(sd_lba),
.sd_rd(sd_rd),
.sd_wr(sd_wr),
.sd_ack(sd_ack),
.sd_buff_addr(sd_buff_addr),
.sd_din(sd_buff_din),
.sd_dout(sd_buff_dout),
.sd_dout_strobe(sd_buff_wr),
.key_strobe(key_strobe),
.key_code(key_code),
.key_pressed(key_pressed),
.key_extended(key_extended),
.mouse_x(mouse_x),
.mouse_y(mouse_y),
.mouse_flags(mouse_flags),
.mouse_strobe(mouse_strobe),
.joystick_0(joy1),
.joystick_1(joy2),
.buttons(buttons),
.status(status),
.scandoubler_disable(scandoubler_disable),
.ypbpr(ypbpr),
.no_csync(no_csync)
);
data_io data_io
(
.clk_sys(clk_sys),
.SPI_SCK(SPI_SCK),
.SPI_SS2(SPI_SS2),
.SPI_DI(SPI_DI),
.clkref_n(~ce_boot),
.ioctl_wr(ioctl_wr),
.ioctl_addr(ioctl_addr),
.ioctl_dout(ioctl_dout),
.ioctl_download(ioctl_download),
.ioctl_index(ioctl_index),
.ioctl_fileext(ioctl_file_ext)
);
wire rom_download = ioctl_download && (ioctl_index == 8'd0);
wire ext_download = ioctl_download && (ioctl_index == 8'd3);
wire tape_download = ioctl_download && (ioctl_index == 8'd4);
reg boot_wr = 0;
reg [22:0] boot_a;
reg [1:0] boot_bank;
reg [7:0] boot_dout;
reg [22:0] tape_addr;
reg tape_wr = 0;
reg tape_ack;
reg [255:0] rom_map = 0;
reg [8:0] page = 0;
always @(posedge clk_sys) begin
reg combo = 0;
reg old_download;
reg old_wr;
reg old_tape_ack;
old_wr <= ioctl_wr;
if((rom_download | ext_download) & old_wr & ~ioctl_wr) begin
if(boot_a[22]) rom_map[boot_a[21:14]] <= 1;
if(combo && &boot_a[13:0]) begin
combo <= 0;
page <= 9'h1FF;
end
end
old_download <= ioctl_download;
if(~old_download & ioctl_download & ext_download) begin
page <= 9'h1EE; // some unused page for malformed file extension
combo <= 0;
if(ioctl_file_ext[15:8] >= "0" && ioctl_file_ext[15:8] <= "9") page[7:4] <= ioctl_file_ext[11:8];
if(ioctl_file_ext[15:8] >= "A" && ioctl_file_ext[15:8] <= "F") page[7:4] <= ioctl_file_ext[11:8]+4'd9;
if(ioctl_file_ext[7:0] >= "0" && ioctl_file_ext[7:0] <= "9") page[3:0] <= ioctl_file_ext[3:0];
if(ioctl_file_ext[7:0] >= "A" && ioctl_file_ext[7:0] <= "F") page[3:0] <= ioctl_file_ext[3:0] +4'd9;
if(ioctl_file_ext[15:0] == "ZZ") page <= 0;
if(ioctl_file_ext[15:0] == "Z0") begin page <= 0; combo <= 1; end
end
old_tape_ack <= tape_ack;
if(tape_download) begin
if(old_tape_ack ^ tape_ack) tape_wr <= 0;
if(~old_wr & ioctl_wr) tape_wr <= 1'b1;
end
end
// A 8MB bank is split to 2 halves
// Fist 4 MB is OS ROM + RAM pages + MF2 ROM
// Second 4 MB is max. 256 pages of HI rom
always_comb begin
boot_wr = (rom_download | ext_download) & ioctl_wr;
boot_dout = ioctl_dout;
boot_a[13:0] = ioctl_addr[13:0];
boot_a[22:14] = '1;
boot_bank = 0;
tape_addr = tape_play_addr;
if (tape_download) begin
tape_addr = ioctl_addr[22:0];
end
else if(ext_download) begin
boot_a[22] = page[8];
boot_a[21:14] = page[7:0] + ioctl_addr[21:14];
boot_bank = { 1'b0, model };
end
else begin
case(ioctl_addr[24:14])
0,4: boot_a[22:14] = 9'h000; //OS
1,5: boot_a[22:14] = 9'h100; //BASIC
2,6: boot_a[22:14] = 9'h107; //AMSDOS
3,7: boot_a[22:14] = 9'h0ff; //MF2
default: boot_wr = 0;
endcase
case(ioctl_addr[24:14])
0,1,2,3: boot_bank = 0; //CPC6128
4,5,6,7: boot_bank = 1; //CPC664
default: boot_bank = 0;
endcase
end
end
//////////////////////////////////////////////////////////////////////////
wire mem_wr;
wire mem_rd;
wire [22:0] ram_a;
wire [7:0] ram_dout;
wire [15:0] vram_dout;
wire [14:0] vram_addr;
assign SDRAM_CLK = clk_sys;
sdram sdram
(
.*,
.init(~locked),
.clk(clk_sys),
.clkref(ce_ref),
.oe (reset ? 1'b0 : mem_rd & ~mf2_ram_en),
.we (reset ? boot_wr : mem_wr & ~mf2_ram_en & ~mf2_rom_en),
.addr(reset ? boot_a : mf2_rom_en ? { 9'h0ff, cpu_addr[13:0] }: ram_a),
.bank(reset ? boot_bank : { 1'b0, model } ),
.din (reset ? boot_dout : cpu_dout),
.dout(ram_dout),
.vram_addr({2'b10,vram_addr,1'b0}),
.vram_dout(vram_dout),
.tape_addr(tape_addr),
.tape_din(boot_dout),
.tape_dout(tape_dout),
.tape_wr(tape_wr),
.tape_rd(tape_rd),
.tape_ack(tape_ack)
);
reg model = 0;
reg reset;
always @(posedge clk_sys) begin
if(reset) model <= st_cpc664;
reset <= status[0] | buttons[1] | rom_download | ext_download;
end
////////////////////// CDT playback ///////////////////////////////
wire tape_read;
wire tape_data_req;
reg tape_data_ack;
reg tape_reset;
reg tape_rd;
reg [7:0] tape_dout;
reg [22:0] tape_play_addr;
reg [22:0] tape_last_addr;
always @(posedge clk_sys) begin
reg old_tape_ack;
if (reset) begin
tape_play_addr <= 1;
tape_last_addr <= 0;
tape_rd <= 0;
tape_reset <= 1;
end else begin
old_tape_ack <= tape_ack;
tape_reset <= 0;
if (tape_download) begin
tape_play_addr <= 0;
tape_last_addr <= tape_addr;
tape_reset <= 1;
end
if (!ioctl_download && tape_rd && tape_ack ^ old_tape_ack) begin
tape_data_ack <= tape_data_req;
tape_rd <= 0;
tape_play_addr <= tape_play_addr + 1'd1;
end else if (!ioctl_download && tape_play_addr <= tape_last_addr && !tape_rd && (tape_data_req ^ tape_data_ack)) begin
tape_rd <= 1;
end
end
end
reg [24:0] tape_motor_cnt;
wire tape_motor_led = tape_motor_cnt[24] ? tape_motor_cnt[23:16] > tape_motor_cnt[7:0] : tape_motor_cnt[23:16] <= tape_motor_cnt[7:0];
always @(posedge clk_sys) tape_motor_cnt <= tape_motor_cnt + 1'd1;
tzxplayer tzxplayer
(
.clk(clk_sys),
.ce(1),
.restart_tape(tape_reset),
.host_tap_in(tape_dout),
.tzx_req(tape_data_req),
.tzx_ack(tape_data_ack),
.cass_read(tape_read),
.cass_motor(tape_motor)
);
//////////////////////////////////////////////////////////////////////////
wire [3:0] fdc_sel = {cpu_addr[10],cpu_addr[8],cpu_addr[7],cpu_addr[0]};
wire [7:0] fdc_dout = (u765_sel & io_rd) ? u765_dout : 8'hFF;
reg motor = 0;
always @(posedge clk_sys) begin
reg old_wr;
old_wr <= io_wr;
if(~old_wr && io_wr && !fdc_sel[3:1]) begin
motor <= cpu_dout[0];
end
end
wire [7:0] u765_dout;
wire u765_sel = (fdc_sel[3:1] == 'b010) & ~st_fdc[1];
reg [1:0] u765_ready = 0;
always @(posedge clk_sys) if(img_mounted[0]) u765_ready[0] <= |img_size;
always @(posedge clk_sys) if(img_mounted[1]) u765_ready[1] <= |img_size;
u765 u765
(
.reset(status[0]),
.clk_sys(clk_sys),
.ce(ce_u765),
.fast(st_fdc[0]),
.a0(fdc_sel[0]),
.ready(u765_ready),
.motor({ motor, motor }),
.available(2'b11),
.nRD(~(u765_sel & io_rd)),
.nWR(~(u765_sel & io_wr)),
.din(cpu_dout),
.dout(u765_dout),
.img_mounted(img_mounted),
.img_size(img_size[31:0]),
.img_wp(0),
.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)
);
/////////////////////////////////////////////////////////////////////////
///////////////////////////// Multiface Two /////////////////////////////
/////////////////////////////////////////////////////////////////////////
wire [7:0] mf2_dout = (mf2_ram_en & mem_rd) ? mf2_ram_out : 8'hFF;
reg mf2_nmi = 0;
reg mf2_en = 0;
reg mf2_hidden = 0;
reg [7:0] mf2_ram[8192];
wire mf2_ram_en = mf2_en & cpu_addr[15:13] == 3'b001;
wire mf2_rom_en = mf2_en & cpu_addr[15:13] == 3'b000;
reg [4:0] mf2_pen_index;
reg [3:0] mf2_crtc_register;
wire [12:0] mf2_store_addr;
reg [12:0] mf2_ram_a;
reg mf2_ram_we;
reg [7:0] mf2_ram_in, mf2_ram_out;
always_comb begin
casex({ cpu_addr[15:8], cpu_dout[7:6] })
{ 8'h7f, 2'b00 }: mf2_store_addr = 13'h1fcf; // pen index
{ 8'h7f, 2'b01 }: mf2_store_addr = mf2_pen_index[4] ? 13'h1fdf : { 9'h1f9, mf2_pen_index[3:0] }; // border/pen color
{ 8'h7f, 2'b10 }: mf2_store_addr = 13'h1fef; // screen mode
{ 8'h7f, 2'b11 }: mf2_store_addr = 13'h1fff; // banking
{ 8'hbc, 2'bXX }: mf2_store_addr = 13'h1cff; // CRTC register select
{ 8'hbd, 2'bXX }: mf2_store_addr = { 9'h1db, mf2_crtc_register[3:0] }; // CRTC register value
{ 8'hf7, 2'bXX }: mf2_store_addr = 13'h17ff; //8255
{ 8'hdf, 2'bXX }: mf2_store_addr = 13'h1aac; //upper rom
default: mf2_store_addr = 0;
endcase
end
always @(posedge clk_sys) begin
if (mf2_ram_we) begin
mf2_ram[mf2_ram_a] <= mf2_ram_in;
mf2_ram_out <= mf2_ram_in;
end else
mf2_ram_out <= mf2_ram[mf2_ram_a];
end
always @(posedge clk_sys) begin
reg old_key_nmi, old_m1, old_io_wr;
old_key_nmi <= key_nmi;
old_m1 <= m1;
old_io_wr <= io_wr;
if (reset) begin
mf2_en <= 0;
mf2_hidden <= |st_mf2;
mf2_nmi <= 0;
end
if(~old_key_nmi & key_nmi & ~mf2_en & ~st_mf2[1]) mf2_nmi <= 1;
if (mf2_nmi & ~old_m1 & m1 & (cpu_addr == 'h66)) begin
mf2_en <= 1;
mf2_hidden <= 0;
mf2_nmi <= 0;
end
if (mf2_en & ~old_m1 & m1 & cpu_addr == 'h65) begin
mf2_hidden <= 1;
end
if (~old_io_wr & io_wr & cpu_addr[15:2] == 14'b11111110111010) begin //fee8/feea
mf2_en <= ~cpu_addr[1] & ~mf2_hidden & ~st_mf2[1];
end else if (~old_io_wr & io_wr & |mf2_store_addr[12:0]) begin //store hw register in MF2 RAM
if (cpu_addr[15:8] == 8'h7f & cpu_dout[7:6] == 2'b00) mf2_pen_index <= cpu_dout[4:0];
if (cpu_addr[15:8] == 8'hbc) mf2_crtc_register <= cpu_dout[3:0];
mf2_ram_a <= mf2_store_addr;
mf2_ram_in <= cpu_dout;
mf2_ram_we <= 1;
end else if (mem_wr & mf2_ram_en) begin //normal MF2 RAM write
mf2_ram_a <= ram_a[12:0];
mf2_ram_in <= cpu_dout;
mf2_ram_we <= 1;
end else begin //MF2 RAM read
mf2_ram_a <= ram_a[12:0];
mf2_ram_we <=0;
end
end
//////////////////////////////////////////////////////////////////////
wire [7:0] playcity_dout;
wire [9:0] playcity_audio_l, playcity_audio_r;
wire playcity_int_n, playcity_nmi;
playcity playcity
(
.clock(clk_sys),
.reset(reset),
.ena(st_playcity_ena),
.phi_n(phi_n),
.phi_en(phi_en_n),
.addr(cpu_addr),
.din(cpu_dout),
.dout(playcity_dout),
.cpu_di(cpu_din),
.m1_n(~m1),
.iorq_n(~iorq),
.rd_n(~rd),
.wr_n(~wr),
.int_n(playcity_int_n),
.nmi(playcity_nmi),
.cursor(cursor),
.audio_l(playcity_audio_l),
.audio_r(playcity_audio_r)
);
//////////////////////////////////////////////////////////////////////
wire mouse_rd = io_rd & st_mouse_en;
wire [7:0] kmouse_dout;
kempston_mouse kmouse
(
.clk_sys(clk_sys),
.reset(reset),
.ps2_mouse(ps2_mouse),
.addr({cpu_addr[0], ~cpu_addr[4] & ~cpu_addr[10] & mouse_rd, cpu_addr[8]}),
.dout(kmouse_dout)
);
wire [7:0] smouse_dout;
symbiface_mouse smouse
(
.clk_sys(clk_sys),
.reset(reset),
.ps2_mouse(ps2_mouse),
.sel((cpu_addr == 16'hFD10) & mouse_rd),
.dout(smouse_dout)
);
wire [7:0] mmouse_dout;
multiplay_mouse mmouse
(
.clk_sys(clk_sys),
.reset(reset),
.ps2_mouse(ps2_mouse),
.sel((cpu_addr[15:4] == 12'hF99) & ~cpu_addr[3] & mouse_rd),
.addr(cpu_addr[2:0]),
.dout(mmouse_dout)
);
/////////////////////////////////////////////////////////////////////////
wire [15:0] cpu_addr;
wire [7:0] cpu_dout;
wire phi_n, phi_en_n;
wire m1, key_nmi;
wire rd, wr, iorq;
wire field;
wire cursor;
wire [9:0] Fn;
wire tape_rec;
wire [1:0] b, g, r;
wire hs, vs, hbl, vbl;
wire [9:0] audio_l, audio_r;
wire [7:0] cpu_din = ram_dout & mf2_dout & fdc_dout & kmouse_dout & smouse_dout & mmouse_dout & playcity_dout;
wire NMI = playcity_nmi | mf2_nmi;
wire IRQ = ~playcity_int_n;
wire io_rd = rd & iorq;
wire io_wr = wr & iorq;
Amstrad_motherboard motherboard
(
.reset(reset),
.clk(clk_sys),
.ce_16(ce_16),
.key_strobe(key_strobe),
.key_pressed(key_pressed),
.key_extended(key_extended),
.key_code(key_code),
.right_shift_mod(st_right_shift_mod),
.keypad_mod(st_keypad_mod),
.Fn(Fn),
.no_wait(st_nowait & ~tape_motor),
.ppi_jumpers({2'b11, ~st_distributor, 1'b1}),
.crtc_type(~st_crtc),
.sync_filter(st_sync_filter),
.joy1(st_joyswap ? joy2 : joy1),
.joy2(st_joyswap ? joy1 : joy2),
.tape_in(tape_play),
.tape_out(tape_rec),
.tape_motor(tape_motor),
.stereo(st_stereo),
.audio_l(audio_l),
.audio_r(audio_r),
.hblank(hbl),
.vblank(vbl),
.hsync(hs),
.vsync(vs),
.red(r),
.green(g),
.blue(b),
.field(field),
.vram_din(vram_dout),
.vram_addr(vram_addr),
.rom_map(rom_map),
.ram64k(model),
.mem_rd(mem_rd),
.mem_wr(mem_wr),
.mem_addr(ram_a),
.phi_n(phi_n),
.phi_en_n(phi_en_n),
.cpu_addr(cpu_addr),
.cpu_dout(cpu_dout),
.cpu_din(cpu_din),
.iorq(iorq),
.rd(rd),
.wr(wr),
.m1(m1),
.nmi(NMI),
.irq(IRQ),
.cursor(cursor),
.key_nmi(key_nmi)
);
//////////////////////////////////////////////////////////////////////
wire [7:0] B, G, R;
wire HSync, VSync, HBlank, VBlank;
wire blank = HBlank | VBlank;
color_mix color_mix
(
.clk_vid(clk_sys),
.ce_pix(ce_16),
.mix(st_palette),
.HSync_in(hs),
.VSync_in(vs),
.HBlank_in(hbl),
.VBlank_in(vbl),
.B_in(b),
.G_in(g),
.R_in(r),
.HSync_out(HSync),
.VSync_out(VSync),
.HBlank_out(HBlank),
.VBlank_out(VBlank),
.B_out(B),
.G_out(G),
.R_out(R)
);
mist_video #(.SD_HCNT_WIDTH(10), .OSD_X_OFFSET(10'd18)) mist_video (
.clk_sys ( clk_sys ),
// OSD SPI interface
.SPI_SCK ( SPI_SCK ),
.SPI_SS3 ( SPI_SS3 ),
.SPI_DI ( SPI_DI ),
// scanlines (00-none 01-25% 10-50% 11-75%)
.scanlines ( st_scanlines ),
// non-scandoubled pixel clock divider 0 - clk_sys/4, 1 - clk_sys/2
.ce_divider ( 1'b0 ),
// 0 = HVSync 31KHz, 1 = CSync 15KHz
.scandoubler_disable ( scandoubler_disable ),
// disable csync without scandoubler
.no_csync ( no_csync ),
// YPbPr always uses composite sync
.ypbpr ( ypbpr ),
// Rotate OSD [0] - rotate [1] - left or right
.rotate ( 2'b00 ),
// composite-like blending
.blend ( 1'b0 ),
// video in
.R ( blank ? 6'd0 : R[7:2] ),
.G ( blank ? 6'd0 : G[7:2] ),
.B ( blank ? 6'd0 : B[7:2] ),
.HSync ( ~HSync ),
.VSync ( ~VSync ),
// MiST video output signals
.VGA_R ( VGA_R ),
.VGA_G ( VGA_G ),
.VGA_B ( VGA_B ),
.VGA_VS ( VGA_VS ),
.VGA_HS ( VGA_HS )
);
//////////////////////////////////////////////////////////////////////
sigma_delta_dac #(10) dac_l
(
.CLK(clk_sys),
.RESET(reset),
.DACin({1'b0, audio_l} + {1'b0, playcity_audio_l} + (st_tape_sound ? {tape_rec, tape_play, 6'd0} : 0)),
.DACout(AUDIO_L)
);
sigma_delta_dac #(10) dac_r
(
.CLK(clk_sys),
.RESET(reset),
.DACin({1'b0, audio_r} + {1'b0, playcity_audio_r} + (st_tape_sound ? {tape_rec, tape_play, 6'd0} : 0)),
.DACout(AUDIO_R)
);
//////////////////////////////////////////////////////////////////////
localparam ear_autostop_time = 5 * 64000000; // 5 sec
reg ear_input_detected;
integer ear_autostop_cnt = 0;
reg UART_RXd, UART_RXd2, tape_in;
reg tape_play;
wire tape_motor;
assign UART_TX = tape_motor;
// detect tape input from UART, switch to external tape input for 5 secs
// if signal transition detected
always @(posedge clk_sys) begin
UART_RXd <= UART_RX;
UART_RXd2 <= UART_RXd;
tape_in <= UART_RXd2;
if (ear_autostop_cnt != 0) ear_autostop_cnt <= ear_autostop_cnt - 1'd1;
if (tape_in ^ UART_RXd2) ear_autostop_cnt <= ear_autostop_time;
tape_play <= (ear_autostop_cnt != 0) ? tape_in : tape_read;
end
endmodule