X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/2854e3991ab66f6fb954aba96caf7875d049431e..4c90390a786b738c0dc0b8d55e7cc2d857f625de:/System.v diff --git a/System.v b/System.v index 1872e51..f89b2a6 100644 --- a/System.v +++ b/System.v @@ -1,21 +1,23 @@ `timescale 1ns / 1ps -module ROM( +module SimROM( input [15:0] address, inout [7:0] data, input clk, input wr, rd); + reg rdlatch = 0; reg [7:0] odata; - // synthesis attribute ram_style of rom is block - reg [7:0] rom [1023:0]; + reg [7:0] rom [32767:0]; initial $readmemh("rom.hex", rom); wire decode = address[15:13] == 0; - always @(posedge clk) + always @(posedge clk) begin + rdlatch <= rd && decode; odata <= rom[address[10:0]]; - assign data = (rd && decode) ? odata : 8'bzzzzzzzz; + end + assign data = rdlatch ? odata : 8'bzzzzzzzz; endmodule module BootstrapROM( @@ -24,12 +26,28 @@ module BootstrapROM( input clk, input wr, rd); - reg [7:0] brom [255:0]; - initial $readmemh("bootstrap.hex", brom); + 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 = brom[address[7:0]]; - assign data = (rd && decode) ? odata : 8'bzzzzzzzz; + 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( @@ -41,13 +59,15 @@ module MiniRAM( reg [7:0] ram [127:0]; wire decode = (address >= 16'hFF80) && (address <= 16'hFFFE); + reg rdlatch = 0; reg [7:0] odata; - assign data = (rd && decode) ? odata : 8'bzzzzzzzz; + assign data = rdlatch ? 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 + 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]]; @@ -55,6 +75,102 @@ module MiniRAM( 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 st_nCE, st_nRST, + 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_PROGFLASH = 16'hFF65; + 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 = ~(addrlatch != ADDR_PROGFLASH); /* 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! */ + + assign st_nRST = 1; /* Keep the strataflash out of reset. */ + assign st_nCE = ~(addrlatch == ADDR_PROGFLASH); + + wire decode = (addrlatch[15:14] == 2'b00) /* extrom */ || (addrlatch[15:13] == 3'b101) /* extram */ || (addrlatch == ADDR_PROGDATA) || (addrlatch == ADDR_PROGFLASH); + + reg [3:0] rambank = 0; + reg [8:0] rombank = 1; + + assign cr_nOE = decode ? ~rdlatch : 1; + assign cr_nWE = (decode && ((addrlatch == ADDR_PROGDATA) || (addrlatch == ADDR_PROGFLASH) || (mbc_emul[6:0] == 0) || (addrlatch[15:13] == 3'b101))) ? ~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) || (addrlatch == ADDR_PROGFLASH)) ? 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_PROGFLASH: 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( input [15:0] address, inout [7:0] data, @@ -64,14 +180,16 @@ module InternalRAM( // 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; - assign data = (rd && decode) ? odata : 8'bzzzzzzzz; + reg rdlatch = 0; + assign data = rdlatch ? 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 + 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]]; @@ -89,10 +207,12 @@ module Switches( 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 @(posedge clk) begin + rdlatch <= rd && decode; if (decode && rd) odata <= switches; else if (decode && wr) @@ -115,8 +235,13 @@ module CoreTop( input [3:0] buttons, output wire [7:0] leds, output serio, + input serin, output wire [3:0] digits, output wire [7:0] seven, + output wire cr_nADV, cr_nCE, cr_nOE, cr_nWE, cr_CRE, cr_nLB, cr_nUB, cr_CLK, st_nCE, st_nRST, + 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, @@ -131,6 +256,7 @@ module CoreTop( wire [7:0] leds; wire serio; + wire serin = 1; wire [3:0] digits; wire [7:0] seven; wire [7:0] switches = 8'b0; @@ -140,15 +266,17 @@ module CoreTop( 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; + wire irq, tmrirq, lcdcirq, vblankirq, btnirq; wire [7:0] jaddr; wire [1:0] state; + wire ack; GBZ80Core core( .clk(clk), @@ -161,6 +289,7 @@ module CoreTop( .bus1wr(wr[1]), .bus1rd(rd[1]), .irq(irq), + .irqack(ack), .jaddr(jaddr), .state(state)); @@ -171,12 +300,33 @@ module CoreTop( .wr(wr[1]), .rd(rd[1])); - ROM rom( +`ifdef isim + SimROM rom( .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[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), + .st_nCE(st_nCE), + .st_nRST(st_nRST)); +`endif wire lcdhs, lcdvs, lcdclk; wire [2:0] lcdr, lcdg; @@ -210,7 +360,47 @@ module CoreTop( .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), + .address(addr[0]), + .data(data[0]), + .wr(wr[0]), + .rd(rd[0]), + .ledout(sleds), + .switches(switches) + ); +`ifdef isim +`else + PS2Button ps2( + .clk(clk), + .inclk(ps2c), + .indata(ps2d), + .buttons(ps2buttons) + ); +`endif + + 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]), @@ -223,23 +413,14 @@ module CoreTop( (state == 2'b10) ? 4'b1000 : 4'b0100) ); - Switches sw( - .clk(clk), - .address(addr[0]), - .data(data[0]), - .wr(wr[0]), - .rd(rd[0]), - .ledout(leds), - .switches(switches) - ); - UART nouart ( /* no u */ .clk(clk), .addr(addr[0]), .data(data[0]), .wr(wr[0]), .rd(rd[0]), - .serial(serio) + .serial(serio), + .serialrx(serin) ); InternalRAM ram( @@ -277,8 +458,9 @@ module CoreTop( .lcdc(lcdcirq), .tovf(tmrirq), .serial(1'b0), - .buttons(1'b0), + .buttons(btnirq), .master(irq), + .ack(ack), .jaddr(jaddr)); Soundcore sound(