Fixed BGEZAL

inputs/bltz/bltz-1.txt

@@ -1,5 +1,4 @@
 3C04FFFF
-00000000
 04800003
 00000000
 00000008

inputs/jalr/jalr-1.txt

@@ -1,4 +1,4 @@
-3C05BCF0
+3C05BFC0
 34A5001C
 00A02009
 00000000

rtl/mips_cpu_control.v

@@ -93,7 +93,7 @@ always @(*) begin
     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)begin
+    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; $display("xxxxxxxxxxxxxx");end//Not all instructions are encompassed so, added incase for debug purposes
@@ -118,7 +118,7 @@ always @(*) 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)))begin
+    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
         CtrlMemtoReg = 3'd3;//write data port of regfile is fed from ALUHi
@@ -224,7 +224,7 @@ always @(*) begin
     end else begin CtrlALUSrc = 1'bx;end
        
     //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==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
+    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

rtl/mips_cpu_harvard.v

@@ -13,11 +13,11 @@ module mips_cpu_harvard(
     input logic[31:0] instr_readdata,//port from instruction memory out, going to various inputs.
 
     /* Combinatorial read and single-cycle write access to instructions */
-    output logic[31:0] data_address,//Port from ALURes going into Data Memory 'Address' port
+    output logic[31:0] data_address,
-    output logic data_write,//Control line from 'control' CtrlMemWrite enabling/disabling write access for Data Memory.
+    output logic data_write,
-    output logic data_read,//Control line from 'control' CtrlMemRead enabling/disabling read access for Data Memory.
+    output logic data_read,
-    output logic[31:0] data_writedata,//Data from Register file 'Read data 2' port, aka rt's data, going to 'Write data' port on Data Memory.
+    output logic[31:0] data_writedata,
-    input logic[31:0] data_readdata//port from data memory out, going to the 'Write Register' port in regfile.
+    input logic[31:0] data_readdata
 );
 
 assign instr_address = out_pc_out;
@@ -61,6 +61,7 @@ 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_memory.v

@@ -16,7 +16,7 @@ module mips_cpu_memory(
     parameter INSTR_INIT_FILE = "";
     parameter DATA_INIT_FILE = "";
     reg [31:0] data_memory [0:31];
-    reg [31:0] instr_memory [0:31];
+    reg [31:0] instr_memory [0:63];
 
     initial begin
         integer i;