X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/62940da0dd1b60db11e9861d6dd55a43c5756114..84dd189a0747b9528b80d2596856b41b1aa38630:/System.v diff --git a/System.v b/System.v index 8b8d613..37ca872 100644 --- a/System.v +++ b/System.v @@ -1,18 +1,165 @@ `timescale 1ns / 1ps -module ROM( +module SimROM( input [15:0] address, inout [7:0] data, input clk, input wr, rd); - reg [7:0] rom [2047:0]; + reg rdlatch = 0; + reg [7:0] odata; + + reg [7:0] rom [32767:0]; initial $readmemh("rom.hex", rom); wire decode = address[15:13] == 0; - wire [7:0] odata = rom[address[11:0]]; - assign data = (rd && decode) ? odata : 8'bzzzzzzzz; - //assign data = rd ? odata : 8'bzzzzzzzz; + always @(posedge clk) begin + rdlatch <= rd && decode; + odata <= rom[address[10:0]]; + end + assign data = rdlatch ? odata : 8'bzzzzzzzz; +endmodule + +module BootstrapROM( + input [15:0] address, + inout [7:0] data, + input clk, + input wr, rd); + + reg rdlatch = 0; + reg [7:0] addrlatch = 0; + reg romno = 0, romnotmp = 0; + reg [7:0] brom0 [255:0]; + reg [7:0] brom1 [255:0]; + + initial $readmemh("fpgaboot.hex", brom0); + initial $readmemh("gbboot.hex", brom1); + +`ifdef isim + initial romno <= 1; +`endif + + wire decode = address[15:8] == 0; + wire [7:0] odata = (romno == 0) ? brom0[addrlatch] : brom1[addrlatch]; + always @(posedge clk) begin + rdlatch <= rd && decode; + addrlatch <= address[7:0]; + if (wr && decode) romnotmp <= data[0]; + if (rd && address == 16'h0000) romno <= romnotmp; /* Latch when the program restarts. */ + end + assign data = rdlatch ? odata : 8'bzzzzzzzz; +endmodule + +module MiniRAM( + input [15:0] address, + inout [7:0] data, + input clk, + input wr, rd); + + reg [7:0] ram [127:0]; + + wire decode = (address >= 16'hFF80) && (address <= 16'hFFFE); + reg rdlatch = 0; + reg [7:0] odata; + assign data = rdlatch ? odata : 8'bzzzzzzzz; + + always @(posedge clk) + begin + rdlatch <= rd && decode; + if (decode) // This has to go this way. The only way XST knows how to do + begin // block ram is chip select, write enable, and always + if (wr) // reading. "else if rd" does not cut it ... + ram[address[6:0]] <= data; + odata <= ram[address[6:0]]; + end + end +endmodule + +module CellularRAM( + input clk, + input [15:0] address, + inout [7:0] data, + input wr, rd, + output wire cr_nADV, cr_nCE, cr_nOE, cr_nWE, cr_CRE, cr_nLB, cr_nUB, cr_CLK, + output wire [22:0] cr_A, + inout [15:0] cr_DQ); + + parameter ADDR_PROGADDRH = 16'hFF60; + parameter ADDR_PROGADDRM = 16'hFF61; + parameter ADDR_PROGADDRL = 16'hFF62; + parameter ADDR_PROGDATA = 16'hFF63; + parameter ADDR_MBC = 16'hFF64; + + reg rdlatch = 0, wrlatch = 0; + reg [15:0] addrlatch = 0; + reg [7:0] datalatch = 0; + + reg [7:0] progaddrh, progaddrm, progaddrl; + + reg [22:0] progaddr; + + reg [7:0] mbc_emul = 8'b00000101; // High bit is whether we're poking flash + // low 7 bits are the MBC that we are emulating + + assign cr_nADV = 0; /* Addresses are always valid! :D */ + assign cr_nCE = 0; /* The chip is enabled */ + assign cr_nLB = 0; /* Lower byte is enabled */ + assign cr_nUB = 0; /* Upper byte is enabled */ + assign cr_CRE = 0; /* Data writes, not config */ + assign cr_CLK = 0; /* Clock? I think not! */ + + wire decode = (addrlatch[15:14] == 2'b00) /* extrom */ || (addrlatch[15:13] == 3'b101) /* extram */ || (addrlatch == ADDR_PROGDATA); + + reg [3:0] rambank = 0; + reg [8:0] rombank = 1; + + assign cr_nOE = decode ? ~rdlatch : 1; + assign cr_nWE = (decode && ((addrlatch == ADDR_PROGDATA) || (mbc_emul[6:0] == 0))) ? ~wrlatch : 1; + + assign cr_DQ = (~cr_nOE) ? 16'bzzzzzzzzzzzzzzzz : {8'b0, datalatch}; + assign cr_A = (addrlatch[15:14] == 2'b00) ? /* extrom, home bank */ {9'b0,addrlatch[13:0]} : + (addrlatch[15:14] == 2'b01) ? /* extrom, paged bank */ {rombank, addrlatch[13:0]} : + (addrlatch[15:13] == 3'b101) ? /* extram */ {1'b1, 5'b0, rambank, addrlatch[12:0]} : + (addrlatch == ADDR_PROGDATA) ? progaddr : + 23'b0; + + always @(posedge clk) begin + case (address) + ADDR_PROGADDRH: if (wr) progaddrh <= data; + ADDR_PROGADDRM: if (wr) progaddrm <= data; + ADDR_PROGADDRL: if (wr) progaddrl <= data; + ADDR_PROGDATA: if (rd || wr) begin + progaddr <= {progaddrh[6:0], progaddrm[7:0], progaddrl[7:0]}; + {progaddrh[6:0], progaddrm[7:0], progaddrl[7:0]} <= {progaddrh[6:0], progaddrm[7:0], progaddrl[7:0]} + 23'b1; + end + ADDR_MBC: begin + mbc_emul <= data; + rambank <= 0; + rombank <= 1; + end + endcase + + if (mbc_emul[6:0] == 5) begin + if ((address[15:12] == 4'h2) && wr) + rombank <= {rombank[8], data}; + else if ((address[15:12] == 4'h3) && wr) + rombank <= {data[0], rombank[7:0]}; + else if ((address[15:12] == 4'h4) && wr) + rambank <= data[3:0]; + end + + rdlatch <= rd; + wrlatch <= wr; + addrlatch <= address; + datalatch <= data; + end + + assign data = (rdlatch && decode) ? + (addrlatch == ADDR_PROGADDRH) ? progaddrh : + (addrlatch == ADDR_PROGADDRM) ? progaddrm : + (addrlatch == ADDR_PROGADDRL) ? progaddrl : + cr_DQ + : 8'bzzzzzzzz; endmodule module InternalRAM( @@ -21,18 +168,19 @@ module InternalRAM( input clk, input wr, rd); - // synthesis attribute ram_style of reg is block + // synthesis attribute ram_style of ram is block reg [7:0] ram [8191:0]; - wire decode = address[15:13] == 3'b110; + wire decode = (address >= 16'hC000) && (address <= 16'hFDFF); /* This includes echo RAM. */ reg [7:0] odata; - wire idata = data; - assign data = (rd && decode) ? odata : 8'bzzzzzzzz; + reg rdlatch = 0; + assign data = rdlatch ? odata : 8'bzzzzzzzz; - always @(negedge clk) + always @(posedge clk) begin - if (decode) // This has to go this way. The only way XST knows how to do - begin // block ram is chip select, write enable, and always + rdlatch <= rd && decode; + if (decode) // This has to go this way. The only way XST knows how to do + begin // block ram is chip select, write enable, and always if (wr) // reading. "else if rd" does not cut it ... ram[address[12:0]] <= data; odata <= ram[address[12:0]]; @@ -46,14 +194,16 @@ module Switches( input clk, input wr, rd, input [7:0] switches, - output reg [7:0] ledout); + output reg [7:0] ledout = 0); wire decode = address == 16'hFF51; reg [7:0] odata; - assign data = (rd && decode) ? odata : 8'bzzzzzzzz; + reg rdlatch = 0; + assign data = rdlatch ? odata : 8'bzzzzzzzz; - always @(negedge clk) + always @(posedge clk) begin + rdlatch <= rd && decode; if (decode && rd) odata <= switches; else if (decode && wr) @@ -61,165 +211,253 @@ module Switches( end endmodule +`ifdef isim +module Dumpable(input [2:0] r, g, input [1:0] b, input hs, vs, vgaclk); +endmodule +`endif + module CoreTop( +`ifdef isim + output reg vgaclk = 0, + output reg clk = 0, +`else input xtal, input [7:0] switches, input [3:0] buttons, output wire [7:0] leds, output serio, + input serin, output wire [3:0] digits, - output wire [7:0] seven); - - wire clk; - CPUDCM dcm (.CLKIN_IN(xtal), .CLKFX_OUT(clk)); + output wire [7:0] seven, + output wire cr_nADV, cr_nCE, cr_nOE, cr_nWE, cr_CRE, cr_nLB, cr_nUB, cr_CLK, + output wire [22:0] cr_A, + inout [15:0] cr_DQ, + input ps2c, ps2d, +`endif + output wire hs, vs, + output wire [2:0] r, g, + output wire [1:0] b, + output wire soundl, soundr); - wire [15:0] addr; - wire [7:0] data; - wire wr, rd; +`ifdef isim + always #62 clk <= ~clk; + always #100 vgaclk <= ~vgaclk; + + Dumpable dump(r,g,b,hs,vs,vgaclk); + + wire [7:0] leds; + wire serio; + wire serin = 1; + wire [3:0] digits; + wire [7:0] seven; + wire [7:0] switches = 8'b0; + wire [3:0] buttons = 4'b0; +`else + wire xtalb, clk, vgaclk; + IBUFG iclkbuf(.O(xtalb), .I(xtal)); + CPUDCM dcm (.CLKIN_IN(xtalb), .CLKFX_OUT(clk)); + pixDCM pixdcm (.CLKIN_IN(xtalb), .CLKFX_OUT(vgaclk)); + wire [7:0] ps2buttons; +`endif + wire [15:0] addr [1:0]; + wire [7:0] data [1:0]; + wire wr [1:0], rd [1:0]; + + wire irq, tmrirq, lcdcirq, vblankirq, btnirq; + wire [7:0] jaddr; + wire [1:0] state; + wire ack; + GBZ80Core core( .clk(clk), - .busaddress(addr), - .busdata(data), - .buswr(wr), - .busrd(rd)); - - ROM rom( - .address(addr), - .data(data), - .clk(clk), - .wr(wr), - .rd(rd)); + .bus0address(addr[0]), + .bus0data(data[0]), + .bus0wr(wr[0]), + .bus0rd(rd[0]), + .bus1address(addr[1]), + .bus1data(data[1]), + .bus1wr(wr[1]), + .bus1rd(rd[1]), + .irq(irq), + .irqack(ack), + .jaddr(jaddr), + .state(state)); - AddrMon amon( - .addr(addr), - .clk(clk), - .digit(digits), - .out(seven), - .freeze(buttons[0]) - ); - - Switches sw( - .address(addr), - .data(data), + BootstrapROM brom( + .address(addr[1]), + .data(data[1]), .clk(clk), - .wr(wr), - .rd(rd), - .ledout(leds), - .switches(switches) - ); - - UART nouart ( /* no u */ - .clk(clk), - .wr(wr), - .rd(rd), - .addr(addr), - .data(data), - .serial(serio) - ); - - InternalRAM ram( - .address(addr), - .data(data), + .wr(wr[1]), + .rd(rd[1])); + +`ifdef isim + SimROM rom( + .address(addr[0]), + .data(data[0]), .clk(clk), - .wr(wr), - .rd(rd)); - - wire irq, tmrirq; - wire [7:0] jaddr; - Timer tmr( + .wr(wr[0]), + .rd(rd[0])); +`else + CellularRAM cellram( + .address(addr[0]), + .data(data[0]), .clk(clk), - .wr(wr), - .rd(rd), - .addr(addr), - .data(data), - .irq(tmrirq)); + .wr(wr[0]), + .rd(rd[0]), + .cr_nADV(cr_nADV), + .cr_nCE(cr_nCE), + .cr_nOE(cr_nOE), + .cr_nWE(cr_nWE), + .cr_CRE(cr_CRE), + .cr_nLB(cr_nLB), + .cr_nUB(cr_nUB), + .cr_CLK(cr_CLK), + .cr_A(cr_A), + .cr_DQ(cr_DQ)); +`endif - Interrupt intr( - .clk(clk), - .rd(rd), - .wr(wr), - .addr(addr), - .data(data), - .vblank(0), - .lcdc(0), - .tovf(tmrirq), - .serial(0), - .buttons(0), - .master(irq), - .jaddr(jaddr)); -endmodule - -module TestBench(); - reg clk = 1; - wire [15:0] addr; - wire [7:0] data; - wire wr, rd; + wire lcdhs, lcdvs, lcdclk; + wire [2:0] lcdr, lcdg; + wire [1:0] lcdb; -// wire [7:0] leds; -// wire [7:0] switches; + LCDC lcdc( + .clk(clk), + .addr(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), + .lcdcirq(lcdcirq), + .vblankirq(vblankirq), + .lcdclk(lcdclk), + .lcdhs(lcdhs), + .lcdvs(lcdvs), + .lcdr(lcdr), + .lcdg(lcdg), + .lcdb(lcdb)); - always #10 clk <= ~clk; - GBZ80Core core( + Framebuffer fb( + .lcdclk(lcdclk), + .lcdhs(lcdhs), + .lcdvs(lcdvs), + .lcdr(lcdr), + .lcdg(lcdg), + .lcdb(lcdb), + .vgaclk(vgaclk), + .vgahs(hs), + .vgavs(vs), + .vgar(r), + .vgag(g), + .vgab(b)); + + wire [7:0] sleds; +`ifdef isim + assign leds = sleds; +`else + assign leds = sleds | ps2buttons; +`endif + Switches sw( .clk(clk), - .busaddress(addr), - .busdata(data), - .buswr(wr), - .busrd(rd)); + .address(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), + .ledout(sleds), + .switches(switches) + ); - ROM rom( +`ifdef isim +`else + PS2Button ps2( .clk(clk), - .address(addr), - .data(data), - .wr(wr), - .rd(rd)); + .inclk(ps2c), + .indata(ps2d), + .buttons(ps2buttons) + ); +`endif - InternalRAM ram( - .address(addr), - .data(data), + Buttons ass( + .core_clk(clk), + .addr(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), + .int(btnirq), + `ifdef isim + .buttons(switches) + `else + .buttons(ps2buttons) + `endif + ); + + AddrMon amon( + .clk(clk), + .addr(addr[0]), + .digit(digits), + .out(seven), + .freeze(buttons[0]), + .periods( + (state == 2'b00) ? 4'b0010 : + (state == 2'b01) ? 4'b0001 : + (state == 2'b10) ? 4'b1000 : + 4'b0100) ); + + UART nouart ( /* no u */ .clk(clk), - .wr(wr), - .rd(rd)); + .addr(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), + .serial(serio), + .serialrx(serin) + ); - wire serio; - UART uart( - .addr(addr), - .data(data), + InternalRAM ram( .clk(clk), - .wr(wr), - .rd(rd), - .serial(serio)); + .address(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]) + ); - wire irq, tmrirq; - wire [7:0] jaddr; + MiniRAM mram( + .clk(clk), + .address(addr[1]), + .data(data[1]), + .wr(wr[1]), + .rd(rd[1]) + ); + Timer tmr( .clk(clk), - .wr(wr), - .rd(rd), - .addr(addr), - .data(data), - .irq(tmrirq)); + .addr(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), + .irq(tmrirq) + ); Interrupt intr( .clk(clk), - .rd(rd), - .wr(wr), - .addr(addr), - .data(data), - .vblank(0), - .lcdc(0), + .addr(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), + .vblank(vblankirq), + .lcdc(lcdcirq), .tovf(tmrirq), - .serial(0), - .buttons(0), + .serial(1'b0), + .buttons(btnirq), .master(irq), + .ack(ack), .jaddr(jaddr)); -// Switches sw( -// .clk(clk), -// .address(addr), -// .data(data), -// .wr(wr), -// .rd(rd), -// .switches(switches), -// .leds(leds)); + Soundcore sound( + .core_clk(clk), + .addr(addr[0]), + .data(data[0]), + .rd(rd[0]), + .wr(wr[0]), + .snd_data_l(soundl), + .snd_data_r(soundr)); endmodule