X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/179b434745a7b2da871d69c201dd1bda3e445f41..74610a872e3bead82589e6ea786e928f319540e4:/System.v diff --git a/System.v b/System.v index 00ee4ec..4d0ddbb 100644 --- a/System.v +++ b/System.v @@ -6,32 +6,123 @@ module ROM( input clk, input wr, rd); - reg [7:0] rom [2047:0]; + reg [7:0] odata; + + // synthesis attribute ram_style of rom is block + reg [7:0] rom [1023:0]; initial $readmemh("rom.hex", rom); wire decode = address[15:13] == 0; - wire [7:0] odata = rom[address[11:0]]; + always @(posedge clk) + odata <= rom[address[10:0]]; assign data = (rd && decode) ? odata : 8'bzzzzzzzz; - //assign data = rd ? odata : 8'bzzzzzzzz; endmodule -module InternalRAM( +module BootstrapROM( + input [15:0] address, + inout [7:0] data, + input clk, + input wr, rd); + + reg [7:0] brom [255:0]; + initial $readmemh("bootstrap.hex", brom); + + wire decode = address[15:8] == 0; + wire [7:0] odata = brom[address[7:0]]; + assign data = (rd && decode) ? odata : 8'bzzzzzzzz; +endmodule + +module MiniRAM( input [15:0] address, inout [7:0] data, input clk, input wr, rd); - // synthesis attribute ram_style of reg is block - reg [7:0] ram [8191:0]; + reg [7:0] ram [127:0]; - wire decode = address[15:13] == 3'b110; + wire decode = (address >= 16'hFF80) && (address <= 16'hFFFE); reg [7:0] odata; assign data = (rd && decode) ? 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 + 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; + + reg [7:0] progaddrh, progaddrm, progaddrl; + + 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 = (address[15:14] == 2'b00) /* extrom */ || (address[15:13] == 3'b101) /* extram */ || (address == ADDR_PROGDATA); + + assign cr_nOE = decode ? ~rd : 1; + assign cr_nWE = decode ? ~wr : 1; + + assign cr_DQ = (~cr_nOE) ? 16'bzzzzzzzzzzzzzzzz : {8'b0, data}; + assign cr_A = (address[15:14] == 2'b00) ? /* extrom */ {9'b0,address[13:0]} : + (address[15:13] == 3'b101) ? {1'b1, 9'b0, address[12:0]} : + (address == ADDR_PROGDATA) ? {progaddrh[6:0], progaddrm[7:0], progaddrl[7:0]} : + 23'b0; + + reg [7:0] regbuf; + + always @(posedge clk) + case (address) + ADDR_PROGADDRH: if (wr) progaddrh <= data; + ADDR_PROGADDRM: if (wr) progaddrm <= data; + ADDR_PROGADDRL: if (wr) progaddrl <= data; + endcase + + assign data = (rd && decode) ? + (address == ADDR_PROGADDRH) ? progaddrh : + (address == ADDR_PROGADDRM) ? progaddrm : + (address == ADDR_PROGADDRL) ? progaddrl : + cr_DQ + : 8'bzzzzzzzz; +endmodule + +module InternalRAM( + input [15:0] address, + inout [7:0] data, + input clk, + input wr, rd); + + // synthesis attribute ram_style of ram is block + reg [7:0] ram [8191:0]; + + wire decode = (address >= 16'hC000) && (address <= 16'hFDFF); /* This includes echo RAM. */ + reg [7:0] odata; + assign data = (rd && decode) ? odata : 8'bzzzzzzzz; + + 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 if (wr) // reading. "else if rd" does not cut it ... ram[address[12:0]] <= data; odata <= ram[address[12:0]]; @@ -51,7 +142,7 @@ module Switches( reg [7:0] odata; assign data = (rd && decode) ? odata : 8'bzzzzzzzz; - always @(negedge clk) + always @(posedge clk) begin if (decode && rd) odata <= switches; @@ -60,50 +151,142 @@ 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, output wire [3:0] digits, - output wire [7:0] seven); + 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, +`endif + output wire hs, vs, + output wire [2:0] r, g, + output wire [1:0] b, + output wire soundl, soundr); + +`ifdef isim + always #62 clk <= ~clk; + always #100 vgaclk <= ~vgaclk; - wire clk; - CPUDCM dcm (.CLKIN_IN(xtal), .CLKFX_OUT(clk)); + Dumpable dump(r,g,b,hs,vs,vgaclk); - wire cclk; -// IBUFG ibuf (.O(cclk), .I(switches[0] & clk)); - assign cclk = clk; + wire [7:0] leds; + wire serio; + 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)); +`endif - wire [15:0] addr; - wire [7:0] data; - wire wr, rd; + wire [15:0] addr [1:0]; + wire [7:0] data [1:0]; + wire wr [1:0], rd [1:0]; - wire irq, tmrirq; + wire irq, tmrirq, lcdcirq, vblankirq; wire [7:0] jaddr; wire [1:0] state; GBZ80Core core( .clk(clk), - .busaddress(addr), - .busdata(data), - .buswr(wr), - .busrd(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), .jaddr(jaddr), .state(state)); + BootstrapROM brom( + .address(addr[1]), + .data(data[1]), + .clk(clk), + .wr(wr[1]), + .rd(rd[1])); + +`ifdef isim ROM rom( - .address(addr), - .data(data), + .address(addr[0]), + .data(data[0]), + .clk(clk), + .wr(wr[0]), + .rd(rd[0])); +`else + CellularRAM cellram( + .address(addr[0]), + .data(data[0]), .clk(clk), - .wr(wr), - .rd(rd)); + .wr(wr[0]), + .rd(rd[0]) + .cr_nADV(cr_nADV), + .cr_nCE(cr_nCE), + .cr_nOE(cr_nOE), + .cr_nWR(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 + + wire lcdhs, lcdvs, lcdclk; + wire [2:0] lcdr, lcdg; + wire [1:0] lcdb; + + 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)); + + 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)); AddrMon amon( - .addr(addr), .clk(clk), + .addr(addr[0]), .digit(digits), .out(seven), .freeze(buttons[0]), @@ -114,129 +297,69 @@ module CoreTop( 4'b0100) ); Switches sw( - .address(addr), - .data(data), .clk(clk), - .wr(wr), - .rd(rd), + .address(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), .ledout(leds), - .switches({switches[7:1],1'b0}) + .switches(switches) ); UART nouart ( /* no u */ - .clk(clk), - .wr(wr), - .rd(rd), - .addr(addr), - .data(data), + .clk(clk), + .addr(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), .serial(serio) ); InternalRAM ram( - .address(addr), - .data(data), .clk(clk), - .wr(wr), - .rd(rd) - ); - - Timer tmr( - .clk(clk), - .wr(wr), - .rd(rd), - .addr(addr), - .data(data), - .irq(tmrirq) + .address(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]) ); - Interrupt intr( + MiniRAM mram( .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 irq, tmrirq; - wire [7:0] jaddr; - - wire [7:0] leds; - wire [7:0] switches; - - always #62 clk <= ~clk; - GBZ80Core core( - .clk(clk), - .busaddress(addr), - .busdata(data), - .buswr(wr), - .busrd(rd), - .irq(irq), - .jaddr(jaddr)); - - ROM rom( - .clk(clk), - .address(addr), - .data(data), - .wr(wr), - .rd(rd)); - - InternalRAM ram( - .address(addr), - .data(data), - .clk(clk), - .wr(wr), - .rd(rd)); + .address(addr[1]), + .data(data[1]), + .wr(wr[1]), + .rd(rd[1]) + ); - wire serio; - UART uart( - .addr(addr), - .data(data), - .clk(clk), - .wr(wr), - .rd(rd), - .serial(serio)); - 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(1'b0), .master(irq), .jaddr(jaddr)); - Switches sw( - .clk(clk), - .address(addr), - .data(data), - .wr(wr), - .rd(rd), - .switches(switches), - .ledout(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