Added stage3 and input/output devices

Author: scopeInfinity

emulator/chipset.v

@@ -12,7 +12,8 @@ module CHIPSET(
     );
 
     reg is_powered_on;
-    reg execute_from_ram;
+    reg flag_execute_from_ram;
+    reg flag_last_zero;
     reg[15:0] pc, pc_next;
 
     // Clock
@@ -79,7 +80,7 @@ module CHIPSET(
         .ram_value(ram_value),
         .brom_value(brom_value),
         .pc(pc),
-        .execute_from_ram(execute_from_ram));
+        .execute_from_ram(flag_execute_from_ram));
 
     // STAGE1
     wire[31:0] instruction_binary;

emulator/com/decoder.v

@@ -1,22 +1,12 @@
-// module DECODER_4_2(
-//     output[3:0] out,
-//     input[1:0] in);
-
-//     assign out[0] = (~in[1] & ~in[0]);
-//     assign out[1] = (~in[1] &  in[0]);
-//     assign out[2] = ( in[1] & ~in[0]);
-//     assign out[3] = ( in[1] &  in[0]);
-// endmodule
-
-
-// module DECODER_8_3(
-//     output[7:0] out,
-//     input[2:0] in);
-
-//     wire [3:0] _out;
-//     DECODER_4_2 d(_out[3:0], in[1:0]);
-
-//     wire not_in2 = ~in[2];
-//     assign out[3:0] = _out[3:0] & {not_in2, not_in2, not_in2, not_in2};
-//     assign out[7:4] = _out[3:0] & {in[2], in[2], in[2], in[2]};
-// endmodule
+module DECODER_3(
+    output[7:0] out,
+    input[2:0] in);
+    assign out[0] = (in==0);
+    assign out[1] = (in==1);
+    assign out[2] = (in==2);
+    assign out[3] = (in==3);
+    assign out[4] = (in==4);
+    assign out[5] = (in==5);
+    assign out[6] = (in==6);
+    assign out[7] = (in==7);
+endmodule

emulator/com/decoder_test.v

@@ -1,61 +1,30 @@
-// `include "emulator/lib/decoder.v"
-
-module decoder_4_2_test;
-//     reg [1:0] in;
-//     wire [3:0] out;
-
-//     DECODER_4_2 dut(.out(out), .in(in));
-
-//     initial begin
-//         in = 2'b00;
-//         # 10
-//         $display("DECODER_TEST: in=%b out=%b", in, out);
-//         if (out != 4'b0001) begin
-//             $error("decoder failed");
-//         end
-//         in = 2'b01;
-//         # 10
-//         $display("DECODER_TEST: in=%b out=%b", in, out);
-//         if (out != 4'b0010) begin
-//             $error("decoder failed");
-//         end
-//         in = 2'b10;
-//         # 10
-//         $display("DECODER_TEST: in=%b out=%b", in, out);
-//         if (out != 4'b0100) begin
-//             $error("decoder failed");
-//         end
-//         in = 2'b11;
-//         # 10
-//         $display("DECODER_TEST: in=%b out=%b", in, out);
-//         if (out != 4'b1000) begin
-//             $error("decoder failed");
-//         end
-
-//     end
+`include "emulator/com/decoder.v"
+
+module decoder_3_test;
+    reg [2:0] in;
+    wire [7:0] out;
+
+    DECODER_3 dut(.out(out), .in(in));
+
+    initial begin
+        in = 3'b010;
+        # 10
+        $display("DECODER_TEST: in=%b out=%b", in, out);
+        if (out !== 8'b00000100) begin
+            $error("decoder failed");
+        end
+        in = 3'b101;
+        # 10
+        $display("DECODER_TEST: in=%b out=%b", in, out);
+        if (out !== 8'b00100000) begin
+            $error("decoder failed");
+        end
+        in = 3'b111;
+        # 10
+        $display("DECODER_TEST: in=%b out=%b", in, out);
+        if (out !== 8'b10000000) begin
+            $error("decoder failed");
+        end
+
+    end
 endmodule
-
-
-// module decoder_8_3_test;
-//     reg [2:0] in;
-//     wire [7:0] out;
-
-//     DECODER_8_3 dut(.out(out), .in(in));
-
-//     initial begin
-//         in = 3'b010;
-//         # 10
-//         $display("DECODER_TEST: in=%b out=%b", in, out);
-//         if (out != 8'b00000100) begin
-//             $error("decoder failed");
-//             $fatal(1);
-//         end
-//         in = 3'b101;
-//         # 10
-//         $display("DECODER_TEST: in=%b out=%b", in, out);
-//         if (out != 8'b00100000) begin
-//             $error("decoder failed");
-//             $fatal(1);
-//         end
-//     end
-// endmodule

emulator/com/flipflop.v

@@ -0,0 +1,15 @@
+module InputDevices(
+    output[31:0] value,
+    input[15:0] address,
+    input[31:0] device0_values,
+    input[31:0] device1_values);
+
+    reg[31:0] _value;
+    always @(address) begin
+        case (address)
+            0: _value = device0_values;
+            1: _value = device1_values;
+        endcase
+    end
+    assign value = _value;
+endmodule

emulator/com/flipflop_test.v

@@ -0,0 +1,35 @@
+`include "emulator/com/input_devices.v"
+
+module InputDevices_test;
+    localparam [31:0] INPUT1 = 32'b11100101111110000100101010110001;
+    localparam [31:0] INPUT2 = 32'b01011100100011000110101000000001;
+
+    reg[31:0] device0_values = INPUT1;
+    reg[31:0] device1_values = INPUT2;
+    reg[15:0] address;
+
+    wire[31:0] value;
+
+    InputDevices dut(
+        .value(value),
+        .address(address),
+        .device0_values(device0_values),
+        .device1_values(device1_values));
+
+    initial begin
+        address = 0;
+        # 10
+        $display("INPUT_DEVICES_TEST: address=%b value=%b", address, value);
+        if (value !== INPUT1) begin
+            $error("in failed");
+            $fatal(1);
+        end
+        address = 1;
+        # 10
+        $display("INPUT_DEVICES_TEST: address=%b value=%b", address, value);
+        if (value !== INPUT2) begin
+            $error("in failed");
+            $fatal(1);
+        end
+    end
+endmodule