JP
authorJoshua Wise <joshua@rebirth.joshuawise.com>
Tue, 1 Apr 2008 05:26:45 +0000 (01:26 -0400)
committerJoshua Wise <joshua@rebirth.joshuawise.com>
Tue, 1 Apr 2008 05:26:45 +0000 (01:26 -0400)
FPGABoy.ise
GBZ80Core.v
System.v [new file with mode: 0644]
Uart.v
rom.hex

index 5cb2ab7..d10eca1 100644 (file)
Binary files a/FPGABoy.ise and b/FPGABoy.ise differ
index 3bc2b16..1bc8f78 100644 (file)
 `define INSN_RST                               8'b11xxx111
 `define INSN_RET                               8'b110x1001     // 1 = RETI, 0 = RET
 `define INSN_CALL                              8'b11001101
+`define INSN_JP_imm                    8'b11000011
+`define INSN_JPCC_imm          8'b110xx010
+
+`define INSN_cc_NZ                     2'b00
+`define INSN_cc_Z                              2'b01
+`define INSN_cc_NC                     2'b10
+`define INSN_cc_C                              2'b11
 
 `define INSN_reg_A             3'b111
 `define INSN_reg_B             3'b000
@@ -423,6 +430,34 @@ module GBZ80Core(
                                        end
                                endcase
                        end
+                       `INSN_JP_imm,`INSN_JPCC_imm: begin
+                               case (cycle)
+                               0:      begin
+                                               `EXEC_INC_PC;
+                                               `EXEC_NEXTADDR_PCINC;
+                                               rd <= 1;
+                                       end
+                               1:      begin
+                                               `EXEC_INC_PC;
+                                               `EXEC_NEXTADDR_PCINC;
+                                               rd <= 1;
+                                       end
+                               2:      begin
+                                               if (!opcode[0]) begin   // i.e., JP cc,nn
+                                                       /* We need to check the condition code to bail out. */
+                                                       case (opcode[4:3])
+                                                       `INSN_cc_NZ:    if (registers[`REG_F][7]) begin `EXEC_NEWCYCLE; end
+                                                       `INSN_cc_Z:             if (!registers[`REG_F][7]) begin `EXEC_NEWCYCLE; end
+                                                       `INSN_cc_NC:    if (registers[`REG_F][4]) begin `EXEC_NEWCYCLE; end
+                                                       `INSN_cc_C:             if (!registers[`REG_F][4]) begin `EXEC_NEWCYCLE; end
+                                                       endcase
+                                               end
+                                       end
+                               3:      begin
+                                               `EXEC_NEWCYCLE;
+                                       end
+                               endcase
+                       end
                        default:
                                $stop;
                        endcase
@@ -656,6 +691,15 @@ module GBZ80Core(
                                        end
                                endcase
                        end
+                       `INSN_JP_imm,`INSN_JPCC_imm: begin
+                               case (cycle)
+                               0:      begin /* type F */ end
+                               1:      tmp <= rdata;   // tmp contains newpcl
+                               2:      tmp2 <= rdata;  // tmp2 contains newpch
+                               3:      {registers[`REG_PCH],registers[`REG_PCL]} <=
+                                               {tmp2,tmp};
+                               endcase
+                       end
                        default:
                                $stop;
                        endcase
@@ -663,175 +707,3 @@ module GBZ80Core(
                end
                endcase
 endmodule
-
-`timescale 1ns / 1ps
-module ROM(
-       input [15:0] address,
-       inout [7:0] data,
-       input clk,
-       input wr, rd);
-
-       reg [7:0] rom [2047:0];
-       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;
-endmodule
-
-module InternalRAM(
-       input [15:0] address,
-       inout [7:0] data,
-       input clk,
-       input wr, rd);
-       
-       reg [7:0] ram [8191:0];
-       
-       wire decode = (address >= 16'hC000) && (address < 16'hFE00);
-       reg [7:0] odata;
-       wire idata = data;
-       assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
-       
-       always @(negedge clk)
-       begin
-               if (decode && rd)
-                       odata <= ram[address[12:0]];
-               else if (decode && wr)
-                       ram[address[12:0]] <= data;
-       end
-endmodule
-
-module Switches(
-       input [15:0] address,
-       inout [7:0] data,
-       input clk,
-       input wr, rd,
-       input [7:0] switches,
-       output reg [7:0] ledout);
-       
-       wire decode = address == 16'hFF51;
-       reg [7:0] odata;
-       wire idata = data;
-       assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
-       
-       always @(negedge clk)
-       begin
-               if (decode && rd)
-                       odata <= switches;
-               else if (decode && wr)
-                       ledout <= data;
-       end
-endmodule
-
-module CoreTop(
-       input xtal,
-       input [1:0] switches,
-       output wire [7:0] leds,
-       output serio,
-       output wire [3:0] digits,
-       output wire [7:0] seven);
-       
-       wire clk;
-       //IBUFG ibuf (.O(clk), .I(iclk));
-       
-       CPUDCM dcm (.CLKIN_IN(xtal), .CLKFX_OUT(clk));
-
-       wire [15:0] addr;
-       wire [7:0] data;
-       wire wr, rd;
-       
-       wire [7:0] ledout;
-       assign leds = switches[1] ? (switches[0]?{rd,wr,addr[5:0]}:data[7:0])
-                                               : ledout;
-
-       GBZ80Core core(
-               .clk(clk),
-               .busaddress(addr),
-               .busdata(data),
-               .buswr(wr),
-               .busrd(rd));
-       
-       ROM rom(
-               .address(addr),
-               .data(data),
-               .clk(clk),
-               .wr(wr),
-               .rd(rd));
-       
-       AddrMon amon(
-    .addr(addr), 
-    .clk(clk), 
-    .digit(digits), 
-    .out(seven)
-    );
-        
-       Switches sw(
-               .address(addr),
-               .data(data),
-               .clk(clk),
-               .wr(wr),
-               .rd(rd),
-               .ledout(ledout),
-               .switches(0)
-               );
-
-       UART nouart (
-    .clk(clk), 
-    .wr(wr), 
-    .rd(rd), 
-    .addr(addr), 
-    .data(data), 
-    .serial(serio)
-    );
-endmodule
-
-module TestBench();
-       reg clk = 0;
-       wire [15:0] addr;
-       wire [7:0] data;
-       wire wr, rd;
-       
-//     wire [7:0] leds;
-//     wire [7:0] switches;
-       
-       always #10 clk <= ~clk;
-       GBZ80Core core(
-               .clk(clk),
-               .busaddress(addr),
-               .busdata(data),
-               .buswr(wr),
-               .busrd(rd));
-       
-       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));
-       
-//     Switches sw(
-//             .clk(clk),
-//             .address(addr),
-//             .data(data),
-//             .wr(wr),
-//             .rd(rd),
-//             .switches(switches),
-//             .leds(leds));
-endmodule
diff --git a/System.v b/System.v
new file mode 100644 (file)
index 0000000..53e6257
--- /dev/null
+++ b/System.v
@@ -0,0 +1,167 @@
+
+`timescale 1ns / 1ps
+module ROM(
+       input [15:0] address,
+       inout [7:0] data,
+       input clk,
+       input wr, rd);
+
+       reg [7:0] rom [2047:0];
+       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;
+endmodule
+
+module InternalRAM(
+       input [15:0] address,
+       inout [7:0] data,
+       input clk,
+       input wr, rd);
+       
+       reg [7:0] ram [8191:0];
+       
+       wire decode = (address >= 16'hC000) && (address < 16'hFE00);
+       reg [7:0] odata;
+       wire idata = data;
+       assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
+       
+       always @(negedge clk)
+       begin
+               if (decode && rd)
+                       odata <= ram[address[12:0]];
+               else if (decode && wr)
+                       ram[address[12:0]] <= data;
+       end
+endmodule
+
+module Switches(
+       input [15:0] address,
+       inout [7:0] data,
+       input clk,
+       input wr, rd,
+       input [7:0] switches,
+       output reg [7:0] ledout);
+       
+       wire decode = address == 16'hFF51;
+       reg [7:0] odata;
+       assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
+       
+       always @(negedge clk)
+       begin
+               if (decode && rd)
+                       odata <= switches;
+               else if (decode && wr)
+                       ledout <= data;
+       end
+endmodule
+
+module CoreTop(
+       input xtal,
+       input [7:0] switches,
+       output wire [7:0] leds,
+       output serio,
+       output wire [3:0] digits,
+       output wire [7:0] seven);
+       
+       wire clk;
+       //IBUFG ibuf (.O(clk), .I(iclk));
+       
+       CPUDCM dcm (.CLKIN_IN(xtal), .CLKFX_OUT(clk));
+
+       wire [15:0] addr;       
+       wire [7:0] data;
+       wire wr, rd;
+
+       GBZ80Core core(
+               .clk(clk),
+               .busaddress(addr),
+               .busdata(data),
+               .buswr(wr),
+               .busrd(rd));
+       
+       ROM rom(
+               .address(addr),
+               .data(data),
+               .clk(clk),
+               .wr(wr),
+               .rd(rd));
+       
+       AddrMon amon(
+    .addr(addr), 
+    .clk(clk), 
+    .digit(digits), 
+    .out(seven)
+    );
+        
+       Switches sw(
+               .address(addr),
+               .data(data),
+               .clk(clk),
+               .wr(wr),
+               .rd(rd),
+               .ledout(leds),
+               .switches(switches)
+               );
+
+       UART nouart (
+    .clk(clk), 
+    .wr(wr), 
+    .rd(rd), 
+    .addr(addr), 
+    .data(data), 
+    .serial(serio)
+    );
+endmodule
+
+module TestBench();
+       reg clk = 0;
+       wire [15:0] addr;
+       wire [7:0] data;
+       wire wr, rd;
+       
+//     wire [7:0] leds;
+//     wire [7:0] switches;
+       
+       always #10 clk <= ~clk;
+       GBZ80Core core(
+               .clk(clk),
+               .busaddress(addr),
+               .busdata(data),
+               .buswr(wr),
+               .busrd(rd));
+       
+       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));
+       
+//     Switches sw(
+//             .clk(clk),
+//             .address(addr),
+//             .data(data),
+//             .wr(wr),
+//             .rd(rd),
+//             .switches(switches),
+//             .leds(leds));
+endmodule
diff --git a/Uart.v b/Uart.v
index f8ee27b..a036c64 100644 (file)
--- a/Uart.v
+++ b/Uart.v
@@ -8,8 +8,13 @@ module UART(
        input wr,
        input rd,
        input [15:0] addr,
-       input [7:0] data,
+       inout [7:0] data,
        output reg serial);
+       
+       wire decode = (addr == `MMAP_ADDR);
+       
+       wire [7:0] odata;
+       assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
 
        reg [7:0] data_stor = 0;
        reg [15:0] clkdiv = 0;
@@ -17,7 +22,9 @@ module UART(
        reg data_end = 0;
        reg [3:0] diqing = 4'b0000;
        
-       wire new = (wr) && (!have_data) && (addr == `MMAP_ADDR);
+       wire new = (wr) && (!have_data) && decode;
+       
+       assign odata = have_data ? 8'b1 : 8'b0;
 
        always @ (negedge clk)
        begin
diff --git a/rom.hex b/rom.hex
index 82a8f25..850cf0d 100644 (file)
--- a/rom.hex
+++ b/rom.hex
@@ -2,6 +2,10 @@
 05
 DF
 0E
+51
+F2
+E2
+0E
 50
 3E
 41
@@ -2042,7 +2046,3 @@ C7
 00
 00
 00
-00
-00
-00
-00
This page took 0.041119 seconds and 4 git commands to generate.