FIxed PC!

inputs/beq/beq-2.ref.txt

@@ -1 +1 @@
-4
+15

rtl/mips_cpu_control.v

@@ -114,7 +114,7 @@ always @(*) begin
         CtrlMemRead = 1;//Memory is read enabled
         CtrlMemtoReg = 3'd1;//write data port of regfile is fed from data memory
         $display("Memory read enabled");
-    end else if ((op==ADDIU) || (op==ANDI) || (op==ORI) || (op==SLTI) || (op==SLTIU) || (op==XORI) || ((op==SPECIAL)&&((funct==ADDU) || (funct==AND) ||  (funct==OR) ||  (funct==SLL) ||  (funct==SLLV) ||  (funct==SLT) ||  (funct==SLTU) ||  (funct==SRA) ||  (funct==SRAV) ||  (funct==SRL) || (funct==SRLV) ||  (funct==SUBU) ||  (funct==XOR))))begin
+    end else if ((op==ADDIU) || (op==ANDI) || (op==ORI) || (op==LUI) || (op==SLTI) || (op==SLTIU) || (op==XORI) || ((op==SPECIAL)&&((funct==ADDU) || (funct==AND) ||  (funct==OR) ||  (funct==SLL) ||  (funct==SLLV) ||  (funct==SLT) ||  (funct==SLTU) ||  (funct==SRA) ||  (funct==SRAV) ||  (funct==SRL) || (funct==SRLV) ||  (funct==SUBU) ||  (funct==XOR))))begin
         CtrlMemRead = 0;//Memory is read disabled
         CtrlMemtoReg = 3'd0;//write data port of regfile is fed from ALURes
         $display("Memory read disabled");

rtl/mips_cpu_cpc.v

@@ -0,0 +1,35 @@
+module mips_cpu_cpc(
+input logic clk,
+input logic rst,
+input logic[31:0] cpc_in,
+output logic[31:0] cpc_out,
+output logic active
+);
+
+reg[31:0] cpc_curr;
+reg is_active;
+
+initial begin
+	cpc_curr = 32'hBFC00000;
+end // initial
+
+always_comb begin
+	if (rst) begin
+		cpc_curr = 32'hBFC00000;
+		is_active = 1;
+	end else begin
+		cpc_curr = cpc_in;
+	end
+
+	if(cpc_in == 32'd0)begin
+		is_active = 0;
+	end
+	
+end
+
+always_ff @(posedge clk) begin
+	cpc_out <= cpc_curr;
+	active <= is_active;
+end
+
+endmodule // pc

rtl/mips_cpu_harvard.v

@@ -88,8 +88,8 @@ mips_cpu_pc pc(
 //PC inputs
     .clk(clk),//clk taken from the Standard signals
     .rst(reset),//clk taken from the Standard signals
-    .instr(instr_readdata), //needed for branches and jumps
+    .Instr(instr_readdata), //needed for branches and jumps
-    .reg_readdata(out_readdata1), //needed for jump register
+    .JumpReg(out_readdata1), //needed for jump register
     .pc_ctrl(out_PC),
 //PC outputs
     .pc_out(out_pc_out),//What the pc outputs at every clock edge that goes into the 'Read address' port of Instruction Memory.

rtl/mips_cpu_npc.v

@@ -0,0 +1,27 @@
+module mips_cpu_npc(
+input logic clk,
+input logic rst,
+input logic[31:0] npc_in,
+output logic[31:0] npc_out
+);
+
+reg[31:0] npc_curr;
+
+initial begin
+	npc_curr = (32'hBFC00000 + 32'd4);
+end // initial
+
+always_comb begin
+	if (rst) begin
+		npc_curr = (32'hBFC00000 + 32'd4);
+	end else begin
+		npc_curr = npc_in;
+	end
+	
+end
+
+always_ff @(posedge clk) begin
+	npc_out <= npc_curr;
+end
+
+endmodule // pc

rtl/mips_cpu_pc.v

@@ -1,56 +1,53 @@
 module mips_cpu_pc(
-	input logic clk,
+input logic clk,
-	input logic rst,
+input logic rst,
-	input logic[1:0] pc_ctrl,
+input logic[31:0] Instr,
-	input logic[31:0] instr,
+input logic[31:0] JumpReg,
-	input logic[31:0] reg_readdata,
+input logic[1:0] pc_ctrl,
-	output logic[31:0] pc_out,
+output logic[31:0] pc_out,
-	output logic active
+output logic active
 );
 
-reg [31:0] pc_next, pc_lit_next, pc_next_next;
+logic[31:0] out_cpc_out;
+logic[31:0] out_npc_out;
+logic[31:0] in_npc_in;
 
-initial begin
+assign pc_out = out_cpc_out;
-	pc_out = 32'hBFC00000;
-	pc_next = pc_out + 32'd4;
-
-end
-
-assign pc_lit_next = pc_out + 32'd4;
-
-always_ff @(posedge clk) begin
-	if (rst) begin
-		active <= 1;
-		pc_out <= 32'hBFC00000;
-	end else begin
-		if(pc_out == 32'd0) begin
-			active <= 0;
-		end
-		pc_out <= pc_next;
-		pc_next <= pc_next_next;
-	end
-end
 
 always @(*) begin
-		case(pc_ctrl)
+    case(pc_ctrl)
-			2'd1: begin // Branch
+        2'd0: begin
-				pc_next_next = pc_out + 32'd4 + {{14{instr[15]}},instr[15:0],2'b00};
+            in_npc_in = out_npc_out + 32'd4;//No branch or jump or load.
-			end
+        end
-			2'd2: begin // Jump
+        2'd1: begin
-				pc_next_next = {pc_lit_next[31:28], instr[25:0], 2'b00};
+            in_npc_in = out_npc_out + {{14{Instr[15]}}, Instr[15:0], 2'b00};
-				$display("JUMPING");
+        end
-				$display("pc_lit_next: %h", pc_lit_next[31:28]);
+        2'd2: begin
-				$display("instr: %b", instr[25:0]);
+            in_npc_in = {out_npc_out[31:28], Instr[25:0], 2'b00};
-				$display("%h",pc_next);
+        end
-			end
+        2'd3: begin
-			2'd3: begin // Jump using Register
+            in_npc_in = JumpReg;
-				pc_next_next = reg_readdata;
+        end
-				$display("REGREADEADTAATATAT %h", reg_readdata);
+    endcase	
-			end
-			default: begin
-				pc_next_next = pc_out + 32'd4;
-			end
-		endcase
 end
 
-endmodule // pc
+mips_cpu_cpc cpc(
+//Inputs for cpc
+	.clk(clk),
+	.rst(rst),
+	.cpc_in(out_npc_out),
+//Outputs for cpc
+	.cpc_out(out_cpc_out),
+    .active(active)
+);
+
+mips_cpu_npc npc(
+//Inputs for npc
+	.clk(clk),
+	.rst(rst),
+	.npc_in(in_npc_in),
+//Outputs for npc
+	.npc_out(out_npc_out)
+);
+
+endmodule