Merge branch 'main' into bus_wrapper

inputs/addu/addu-2.ref.txt

@@ -0,0 +1 @@
+0

inputs/addu/addu-2.txt

@@ -0,0 +1,4 @@
+3C041000
+3C05F000
+00000008
+00851021

inputs/bgezal/bgezal-2.ref.txt

@@ -0,0 +1 @@
+2

inputs/bgezal/bgezal-2.txt

@@ -0,0 +1,5 @@
+3C04FFFF
+04910004
+03E00008
+24420001
+00000008

inputs/jr/jr-3.ref.txt

@@ -0,0 +1 @@
+0

inputs/jr/jr-3.txt

@@ -0,0 +1,4 @@
+3C05BFC0
+34A50008
+00A00008
+00000008

reference/reference.txt

@@ -30,6 +30,20 @@ ADDU $2,$4,$5
 
 register_v0 = 8
 
+-Test not overflowing property
+
+lui $4,$0,0x1000
+lui $5,$0,0xF000
+JR $0
+ADDU $2,$4,$5
+
+3C041000
+3C05F000
+00000008
+00851021
+
+register_v0 = 0
+
 ==AND Bitwise and==
 
 LUI $5,0xCCCC
@@ -126,6 +140,22 @@ JR $31
 
 register_v0 = 2
 
+-Testing whether it would link if branch fails
+
+lui $4,0xFFFF
+BGEZAL $4,4
+JR $31
+ADDIU $2,$2,1
+JR $0
+
+3C04FFFF
+04910004
+03E00008
+24420001
+00000008
+
+register_v0 = 2
+
 ==BGTZ Branch on greater than zero==
 
 ORI $4,$0,3
@@ -363,6 +393,20 @@ ORI $2,$0,5
 
 register_v0 = 5
 
+-This broke testbench once due to log.txt weirdness
+
+LUI $5,0xBFC0  
+ORI $5,$5,0x0008
+JR $5  
+JR $0
+
+3C05BFC0
+34A50008
+00A00008
+00000008
+
+register_v0 = 0
+
 ==LB	Load byte==
 
 ORI $4,$0,0x1001

rtl/mips_cpu_alu.v

@@ -135,7 +135,6 @@ end
 
       SLL: begin
           ALURes = B << shamt;
-          $display("ALURES SLL: %h", ALURes);
       end
 
       SLLV: begin
@@ -169,7 +168,6 @@ end
       end
 
       LES: begin
-          $display("ALU A: %h B: %h", $signed(A), $signed(B));
           if ($signed(A) < $signed(B)) begin
             ALUCond = 1;
           end
@@ -248,7 +246,6 @@ end
       end
 
       DIVU: begin
-        $display("ALU A: %h B: %h", A, B);
           temp_Lo = A / B;
           temp_Hi = A % B;
       end

rtl/mips_cpu_control.v

@@ -89,35 +89,28 @@ always @(*) begin
     //CtrlRegDst logic
     if((op==ADDIU) || (op==ANDI) || (op==LB) || (op==LBU) || (op==LH) || (op==LHU) || (op==LUI) || (op==LW) || (op==LWL) || (op==LWR) || (op==ORI) || (op==SLTI) || (op==SLTIU) || (op==XORI))begin
         CtrlRegDst = 2'd0; //Write address comes from rt
-        $display("CTRLREGDST: Rt");
     end else if ((op==SPECIAL)&&((funct==ADDU) || (funct==AND) || (funct==JALR) || (funct==MFLO) || (funct==MFHI) || (funct==OR) || (funct==SLL) || (funct==SLLV) || (funct==SLT) || (funct==SLTU) || (funct==SRA) || (funct==SRAV) || (funct==SRL) || (funct==SRLV) || (funct==SUBU) || (funct==XOR)))begin
         CtrlRegDst = 2'd1; //Write address comes from rd
-        $display("CTRLREGDST: Rd");
     end else if ((op == JAL) || ((op==REGIMM)&&((rt==BGEZAL) || (rt==BLTZAL))))begin
         CtrlRegDst = 2'd2; //const reg 31, for writing to the link register
-        $display("CTRLREGDST: Link");
+    end else begin CtrlRegDst = 1'bx; end//Not all instructions are encompassed so, added incase for debug purposes
-    end else begin CtrlRegDst = 1'bx; $display("xxxxxxxxxxxxxx");end//Not all instructions are encompassed so, added incase for debug purposes
 
     //CtrlPC logic
     if(ALUCond && ((op==BEQ) || (op==BGTZ) || (op==BLEZ) || (op==BNE) || ((op==REGIMM)&&((rt==BGEZ) || (rt==BGEZAL) || (rt==BLTZ) || (rt==BLTZAL)))))begin
         CtrlPC = 2'd1; // Branches - Jumps relative to PC
     end else if((op==J) || (op==JAL))begin
         CtrlPC = 2'd2; // Jumps within 256MB Region using 26-bit immediate in J type instruction
-        $display("Jump PC Ctrl");
     end else if((op==SPECIAL)&&((funct==JR) || (funct==JALR)))begin
         CtrlPC = 2'd3; // Jumps using Register.
-        $display("Ctrl PC Jump Register");
+    end else begin CtrlPC = 2'd0; end // No jumps or branches, just increment to next word
-    end else begin CtrlPC = 2'd0; /*/$display("Ctrl PC No Jump/Branch");*/end // No jumps or branches, just increment to next word
     
     //CtrlMemRead and CtrlMemtoReg logic -- Interesting quirk that they have the same logic where both are concerned. Makes sense bc you'd only want to select the read data out when the memory itself is read enabled.
     if((op==LB) || (op==LBU) || (op==LH) || (op==LHU) || (op==LW) || (op==LWL) || (op==LWR))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==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");
     end else if ((op==JAL) || ((op==SPECIAL)&&(funct == JALR)) || ((op==REGIMM)&&((rt==BGEZAL) || (rt==BLTZAL))))begin
         CtrlMemtoReg = 3'd2;//write data port of regfile is fed from PC + 8
     end else if ((op==SPECIAL)&&(funct == MFHI))begin
@@ -127,11 +120,10 @@ always @(*) begin
     end else if ((op==SPECIAL)&&(funct == JR))begin
         CtrlMemRead = 0;//Read disabled during jump
     end else begin CtrlMemRead = 1'bx;end//Not all instructions are encompassed so, added incase for debug purposes
-    $display("OP: %d, Funct: %d", op, funct);
+
     //CtrlALUOp Logic
     if((op==ADDIU) || ((op==SPECIAL)&&(funct==ADDU)))begin
         CtrlALUOp = 5'd0; //ADD from ALUOps
-        $display("ALU OP = 0 (ADDU/ADDIU)");
     end else if((op==ANDI) || ((op==SPECIAL)&&(funct==AND)))begin
         CtrlALUOp = 5'd4;//AND from ALUOps
     end else if(op==BEQ) begin
@@ -148,12 +140,10 @@ always @(*) begin
         CtrlALUOp = 5'd18;//NEQ from ALUOps
     end else if((op==SPECIAL)&&(funct==DIV))begin
         CtrlALUOp = 5'd3;//DIV from ALUOps
-        $display("DIV CONTROL ALUOps");
     end else if((op==SPECIAL)&&(funct==DIVU))begin
         CtrlALUOp = 5'd23;//DIVU from ALUOps
     end else if((op==LB) || (op==LBU) || (op==LH) || (op==LHU) || (op==LW) || (op==LWL) || (op==LWR) || (op==SB) || (op==SH) || (op==SW))begin
         CtrlALUOp = 5'd0;//ADD from ALUOps
-        $display("LB IN CONTROL");
     end else if(op==LUI)begin
         CtrlALUOp = 5'd7;//SLL from ALUOps
     end else if((op==SPECIAL)&&((funct==MTHI)))begin
@@ -168,31 +158,24 @@ always @(*) begin
         CtrlALUOp = 5'd5;//OR from ALUOps
     end else if((op==SPECIAL)&&(funct==SLL))begin
         CtrlALUOp = 5'd7;//SLL from ALUOps
-        $display("ALU Op = 7 (SLL)");
     end else if((op==SPECIAL)&&(funct==SLLV))begin
         CtrlALUOp = 5'd8;//SLLV from ALUOps
-        $display("ALU Op = 9 (SLLV)");
     end else if((op==SPECIAL)&&(funct==SRA))begin
         CtrlALUOp = 5'd11;//SRA from ALUOps
-        $display("ALU Op = 11 (SRA)");
     end else if((op==SPECIAL)&&(funct==SRAV))begin
         CtrlALUOp = 5'd12;//SRAV from ALUOps
     end else if((op==SPECIAL)&&(funct==SRL))begin
-        $display("ALU Op = 7 (SRL)");
         CtrlALUOp = 5'd9;//SRL from ALUOps
     end else if((op==SPECIAL)&&(funct==SRLV))begin
         CtrlALUOp = 5'd10;//SRLV from ALUOps
     end else if((op==SLTI) || ((op==SPECIAL)&&(funct==SLT)))begin
         CtrlALUOp = 5'd20;//SLT from ALUOps
-        $display("ALU Op = 20 (SLT/SLTI)");
     end else if((op==SLTIU) || ((op==SPECIAL)&&(funct==SLTU)))begin
         CtrlALUOp = 5'd21;//SLTU from ALUOps
-        $display("ALU Op = 21 (SLTU/SLTIU)");
     end else if((op==SPECIAL)&&(funct==SUBU))begin
         CtrlALUOp = 5'd1;//SUB from ALUOps
     end else if((op==XORI) || ((op==SPECIAL)&&(funct==XOR)))begin
         CtrlALUOp = 5'd6;//XOR from ALUOps
-        $display("ALU Op = 6 (XOR)");
     end else begin
         CtrlALUOp = 5'bxxxxx;
     end
@@ -202,7 +185,6 @@ always @(*) begin
         Ctrlshamt = Instr[10:6];// Shift amount piped in from the instruction
     end else if(op == LUI)begin
         Ctrlshamt = 5'd16;//Used specifically to implement LUI as the instruction itslef does not include shamt
-        $display("LUI SHIFTING");
     end else begin Ctrlshamt = 5'bxxxxx;end
 
     //CtrlMemWrite logic
@@ -213,7 +195,6 @@ always @(*) begin
     //CtrlSpcRegWriteEn logic
     if((op==SPECIAL)&&((funct==MTHI) || (funct==MTLO) || (funct==MULT) || (funct==MULTU) || (funct==DIV) || (funct==DIVU)))begin
         CtrlSpcRegWriteEn = 1;//Special register Hi and Lo are write enabled
-        $display("Temp being written");
     end else begin CtrlSpcRegWriteEn = 0;end//default is 0 to ensure no accidental overwriting.
     
     //CtrlALUSrc logic
@@ -228,7 +209,6 @@ always @(*) begin
     //CtrlRegWrite logic
     if((op==ADDIU) || (op==ANDI) || (op==LB) || (op==LBU) || (op==LH) || (op==LHU) || (op==LUI) || (op==LW) || (op==LWL) || (op==LWR) || (op==ORI) || (op==JAL) || (op==SLTI) || (op==XORI) || ((op==REGIMM)&&((rt==BGEZAL) || (rt==BLTZAL))) || ((op==SPECIAL)&&((funct==ADDU) || (funct==AND) || (funct==MFLO) || (funct==MFHI) || (funct==OR) || (funct==SLL) || (funct==SLLV) || (funct==SLT) || (funct==SLTU) || (funct==SRA) || (funct==SRAV) || (funct==SRL) || (funct==SRLV) || (funct==SUBU) || (funct==JALR) || (funct==XOR)))) begin
         CtrlRegWrite = 1;//The Registers are Write Enabled
-        $display("OPcode mflo: %h", op);
     end else begin CtrlRegWrite = 0;end // The Registers are Write Disabled
 end
 endmodule

rtl/mips_cpu_harvard.v

@@ -61,7 +61,6 @@ always @(*) begin
         end
         3'd2:begin
             in_writedata = (out_pc_out + 32'd8);//Output from PC +8.
-            $display("LINKING-----------<: %h", in_writedata);
         end
         3'd3:begin
             in_writedata = (out_ALUHi);

rtl/mips_cpu_regfile.v

@@ -29,7 +29,6 @@ always_ff @(negedge clk) begin
 	if (writereg == 5'b00000) begin
 		// skip writing if rd is $0
 	end else if (regwrite) begin
-		$display("%b", opcode);
 		case (opcode)
 			6'b100000: begin //lb, load byte
 				case (readdata1[1:0])	
@@ -38,8 +37,6 @@ always_ff @(negedge clk) begin
 					2'b10: memory[writereg] <= {{24{writedata[23]}}, writedata[23:16]};
 					2'b11: memory[writereg] <= {{24{writedata[31]}}, writedata[31:24]};
 				endcase // readdata1[1:0]
-				$display("writedata %h", writedata);
-				$display("memory writereg %h", memory[writereg]);
 			end
 			6'b100100: begin //lbu, load byte unsigned
 				case (readdata1[1:0])
@@ -79,7 +76,6 @@ always_ff @(negedge clk) begin
 			end
 			default: begin 
 				memory[writereg] <= writedata; //most instructions
-				$display("Write %d in regfile", writedata);
 			end
 		endcase // opcode
 	end

test/test_mips_cpu_custom.sh

@@ -1,67 +0,0 @@
-#!/bin/bash
-
-# arithmetic
-./test/test_mips_cpu_harvard.sh rtl addu             #Pass
-./test/test_mips_cpu_harvard.sh rtl addiu            #Pass
-./test/test_mips_cpu_harvard.sh rtl subu             #Pass
-./test/test_mips_cpu_harvard.sh rtl and              #Pass
-./test/test_mips_cpu_harvard.sh rtl andi             #Pass
-./test/test_mips_cpu_harvard.sh rtl or               #Pass
-./test/test_mips_cpu_harvard.sh rtl ori              #Pass
-./test/test_mips_cpu_harvard.sh rtl xor              #Pass
-./test/test_mips_cpu_harvard.sh rtl xori             #Pass
-./test/test_mips_cpu_harvard.sh rtl div              #Pass
-./test/test_mips_cpu_harvard.sh rtl divu             #pass
-./test/test_mips_cpu_harvard.sh rtl mthi             #Pass
-./test/test_mips_cpu_harvard.sh rtl mtlo             #Pass
-./test/test_mips_cpu_harvard.sh rtl mult             #Pass
-./test/test_mips_cpu_harvard.sh rtl multu            #Pass
-
-
-# branches
-./test/test_mips_cpu_harvard.sh rtl beq              #Pass
-./test/test_mips_cpu_harvard.sh rtl bgez             #Pass
-./test/test_mips_cpu_harvard.sh rtl bgezal           #Pass
-./test/test_mips_cpu_harvard.sh rtl bgtz             #Pass
-./test/test_mips_cpu_harvard.sh rtl blez             #Pass
-./test/test_mips_cpu_harvard.sh rtl bltz             #Pass
-./test/test_mips_cpu_harvard.sh rtl bltzal           #Pass
-./test/test_mips_cpu_harvard.sh rtl bne              #Pass
-
-# jumps
-./test/test_mips_cpu_harvard.sh rtl j                #Pass
-./test/test_mips_cpu_harvard.sh rtl jalr             #Pass
-./test/test_mips_cpu_harvard.sh rtl jal              #Pass
-./test/test_mips_cpu_harvard.sh rtl jr               #Pass
-
-# shift
-./test/test_mips_cpu_harvard.sh rtl sll              #Pass
-./test/test_mips_cpu_harvard.sh rtl srl              #Pass
-./test/test_mips_cpu_harvard.sh rtl sra              #Pass
-./test/test_mips_cpu_harvard.sh rtl srav             #Pass
-./test/test_mips_cpu_harvard.sh rtl sllv             #Pass
-./test/test_mips_cpu_harvard.sh rtl srlv             #Pass
-
-
-
-# load & store
-./test/test_mips_cpu_harvard.sh rtl lw               #Pass
-./test/test_mips_cpu_harvard.sh rtl lb               #Pass
-./test/test_mips_cpu_harvard.sh rtl lbu              #Pass
-./test/test_mips_cpu_harvard.sh rtl lh               #Pass
-./test/test_mips_cpu_harvard.sh rtl lhu              #Pass
-./test/test_mips_cpu_harvard.sh rtl lui              #Pass
-./test/test_mips_cpu_harvard.sh rtl lwl              #Pass
-./test/test_mips_cpu_harvard.sh rtl lwr              #Pass
-./test/test_mips_cpu_harvard.sh rtl sw               #Pass
-#./test/test_mips_cpu_harvard.sh rtl sb              #Once switched to bus
-#./test/test_mips_cpu_harvard.sh rtl sh              #Once switched to bus
-
-
-# set on less than **Branch delay slots dont work on these...
-./test/test_mips_cpu_harvard.sh rtl slti             #Pass
-./test/test_mips_cpu_harvard.sh rtl sltiu            #Pass
-./test/test_mips_cpu_harvard.sh rtl slt              #Pass
-./test/test_mips_cpu_harvard.sh rtl sltu             #Pass
-
-

testbench/mips_cpu_harvard_tb.v

@@ -59,14 +59,7 @@ module mips_cpu_harvard_tb;
         else $display("TB: CPU did not set active=1 after reset.");
 
         while (active) begin
-            //$display("Clk: %d", clk);
             @(posedge clk);
-            //$display("Register v0: %d", register_v0);
-            //$display("Reg File Write data: %d", cpuInst.in_writedata);
-            $display("Reg File Out Read data: %h", cpuInst.out_readdata1);
-            $display("Reg File opcode: %b", cpuInst.regfile.opcode);
-            //$display("ALU output: %h", cpuInst.out_ALURes);
-            //$display("ALU input B: %h", cpuInst.alu.B);
         end
         @(posedge clk);
         $display("TB: CPU Halt; active=0");

testbench/mips_cpu_memory.v

@@ -56,16 +56,9 @@ module mips_cpu_memory(
 
     //Synchronous write path
     always_ff @(posedge clk) begin
-        //$display("Instruction: %h", instr_readdata);
-        //$display("RAM : INFO : data_read=%h, data_address = %h, mem=%h", data_read, data_address, memory[data_address]);
         if (data_write) begin              //cannot read and write to memory in the same cycle
             if (instr_address != data_address) begin    //cannot modify the instruction being read
                 data_memory[(data_address-32'h00001000)>>2] <= data_writedata;    
-                $display("Store in memory");     
-                $display(data_writedata);      
-            end
-            for (integer k = 0; k<$size(data_memory); k++) begin
-            $display("byte +%h: %h", 32'h00001000+k*4, data_memory[k]);
             end
         end