Update files to remove random Quartus errors

rtl/mips_cpu_alu.sv

@@ -223,6 +223,8 @@ end
         temp_Lo = Lo_in;
       end
 		
+		default: begin
+		end
     endcase
   end
 

rtl/mips_cpu_cpc.sv

@@ -19,12 +19,12 @@ always_comb begin
 		is_active = 1;
 	end else begin
 		cpc_curr = cpc_in;
-	end
-
 		if(cpc_in == 32'd0)begin
 			is_active = 0;
+		end else begin
+			is_active = 1;
+		end
 	end	
-	
 end
 
 always_ff @(posedge clk) begin

rtl/mips_cpu_harvard.sv

@@ -50,6 +50,9 @@ always @(*) begin
         2'd2: begin
             in_writereg = 5'd31;//Link Register 31.
         end
+		  default: begin
+				in_writereg = 5'bxxxxx;
+		  end
     endcase
 
     //Picking which output should be written to regfile.
@@ -69,6 +72,9 @@ always @(*) begin
         3'd4:begin
             in_writedata = (out_ALULo);
         end
+		  default: begin
+				in_writedata = 32'hxxxxxxxx;
+		  end
     endcase
 
     //Picking which output should be taken as the second operand for ALU.

rtl/mips_cpu_regfile.sv

@@ -13,7 +13,7 @@ input logic[1:0] vaddr, //partial read offset from ALUout
 output logic[31:0] regv0 //debug output of $v0 or $2 (third register in file/ first register for returning function results)
 );
 
-reg[31:0] memory [31:0]; //32 register slots, 32-bits wide
+logic[31:0] memory [0:31]; //32 register slots, 32-bits wide
 
 initial begin
 	integer i; //Initialise to zero by default
@@ -27,14 +27,13 @@ assign regv0 = memory[2]; //assigning debug $v0 line to $2 of memory
 assign readdata1 = memory[readreg1]; //combinatorially output register value based on read port 1 selector
 assign readdata2 = memory[readreg2]; //combinatorially output register value based on read port 2 selector
 
-always_ff @(posedge rst) begin
+always_ff @(posedge rst or negedge clk) begin
+	if(rst) begin
 		integer i; //Initialise to zero when reset
 		for (i = 0; i < 32; i++) begin
 			memory[i] = 0;
 		end
-end
-
-always_ff @(negedge clk) begin
+	end else begin
 		if (writereg == 5'b00000) begin
 			// skip writing if rd is $0
 		end else if (regwrite) begin
@@ -89,5 +88,6 @@ always_ff @(negedge clk) begin
 			endcase // opcode
 		end
 	end
+end
 
 endmodule

testbench/mips_cpu_harvard_tb.sv

@@ -1,10 +1,13 @@
-module mips_cpu_harvard_tb;
+module mips_cpu_harvard_tb(
+input logic clk,
+input logic reset
+);
 
     parameter INSTR_INIT_FILE = "inputs/lw/lw-1.instr.txt";
     parameter DATA_INIT_FILE = "inputs/lw/lw-1.data.txt";
     parameter TIMEOUT_CYCLES = 100;
 
-    logic clk, clk_enable, reset, active, data_read, data_write;
+    logic clk_enable, active, data_read, data_write;
     logic[31:0] register_v0, instr_address, instr_readdata, data_readdata, data_writedata, data_address;
 
     mips_cpu_harvard_memory #(INSTR_INIT_FILE, DATA_INIT_FILE) ramInst(
@@ -33,6 +36,7 @@ module mips_cpu_harvard_tb;
     );
 
     // Generate clock
+	 /*
     initial begin
         $dumpfile("mips_cpu_harvard.vcd");
         $dumpvars(0,mips_cpu_harvard_tb);
@@ -68,4 +72,5 @@ module mips_cpu_harvard_tb;
         $finish;
 
     end
+	 */
 endmodule