input clk,
input wr, rd);
+ 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[10:0]];
+ always @(posedge clk)
+ odata <= rom[address[10:0]];
+ assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
+endmodule
+
+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;
- //assign data = rd ? odata : 8'bzzzzzzzz;
endmodule
-module MiniRAM( /* XXX will need to go INSIDE the CPU for when we do DMA */
+module MiniRAM(
input [15:0] address,
inout [7:0] data,
input clk,
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
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,
// 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;
- 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 (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]];
reg [7:0] odata;
assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
- always @(negedge clk)
+ always @(posedge clk)
begin
if (decode && rd)
odata <= switches;
output serio,
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,
+ output wire [22:0] cr_A,
+ inout [15:0] cr_DQ,
`endif
output wire hs, vs,
output wire [2:0] r, g,
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, lcdcirq, vblankirq;
wire [7:0] jaddr;
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),
- .rd(rd));
+ .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_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(
- .addr(addr),
- .data(data),
.clk(clk),
- .wr(wr),
- .rd(rd),
+ .addr(addr[0]),
+ .data(data[0]),
+ .wr(wr[0]),
+ .rd(rd[0]),
.lcdcirq(lcdcirq),
.vblankirq(vblankirq),
.lcdclk(lcdclk),
.vgab(b));
AddrMon amon(
- .addr(addr),
.clk(clk),
+ .addr(addr[0]),
.digit(digits),
.out(seven),
.freeze(buttons[0]),
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)
);
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)
+ .address(addr[0]),
+ .data(data[0]),
+ .wr(wr[0]),
+ .rd(rd[0])
);
MiniRAM mram(
- .address(addr),
- .data(data),
.clk(clk),
- .wr(wr),
- .rd(rd)
+ .address(addr[1]),
+ .data(data[1]),
+ .wr(wr[1]),
+ .rd(rd[1])
);
Timer tmr(
.clk(clk),
- .wr(wr),
- .rd(rd),
- .addr(addr),
- .data(data),
+ .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),
+ .addr(addr[0]),
+ .data(data[0]),
+ .wr(wr[0]),
+ .rd(rd[0]),
.vblank(vblankirq),
.lcdc(lcdcirq),
.tovf(tmrirq),
Soundcore sound(
.core_clk(clk),
- .rd(rd),
- .wr(wr),
- .addr(addr),
- .data(data),
+ .addr(addr[0]),
+ .data(data[0]),
+ .rd(rd[0]),
+ .wr(wr[0]),
.snd_data_l(soundl),
.snd_data_r(soundr));
endmodule
-
-`ifdef verilator
-`else
-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));
-
- 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));
-
- 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));
-
- Switches sw(
- .clk(clk),
- .address(addr),
- .data(data),
- .wr(wr),
- .rd(rd),
- .switches(switches),
- .ledout(leds));
-endmodule
-`endif
git.joshuawise.com / fpgaboy.git / blobdiff