Added instruction counter and register file

asm/src/ELEC4720-2026s2-Ass-02-Demo.bin

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+//      $File: NewcastleUniversity/ELEC4720/2026s2/src/Code/Assignment/Ass-02-Demo.txt $
+//      $Date: 2026-10-07 01:48:03 +1100 (Wed, 07 Oct 2026) $
+//  $Revision: 2523 $
+//    $Author: Peter $
+//
+//     Course: ELEC4720(2026s2) Programmable Logic Design
+//     School: Engineering
+// University: The University of Newcastle
+//    Address: CALLAGHAN NSW 2308 Australia
+//
+//     Author: Dr Peter Stepien
+//      Email: peter.stepien@newcastle.edu.au
+//  Copyright: 2026
+	
+// Assignment 2 Demonstration Program (all instructions)
+
+// main:
+// Initialise some registers
+01084023 // subu $t0, $t0, $t0
+25090007 // addiu $t1, $t0, 7
+
+// Memory operations
+ad090000 // sw $t1, 0x0000($t0)
+8d0a0000 // lw $t2, 0x0000($t0)
+
+// Remaining arithmetic
+012a5821 // addu $t3, $t1, $t2
+012b6022 // sub $t4, $t1, $t3
+212d0003 // addi $t5, $t1, 3
+018d7020 // add $t6, $t4, $t5 
+
+// Logical
+012d8024 // and $s0, $t1, $t5
+012d8825 // or $s1, $t1, $t5 
+012d9026 // xor $s2, $t1, $t5
+012d9827 // nor $s3, $t1, $t5
+
+// Comparison
+018ea02a // slt $s4, $t4, $t6 
+018ea82b // sltu $s5, $t4, $t6
+
+// Loop to test branch
+// loop:
+25080001 // addiu $t0, $t0, 1 
+010db02b // sltu $s6, $t0, $t5
+12d4fffd // beq $s6, $s4, loop
+
+// Endless loop at end of program (FPGA)
+// finish:
+12d6ffff // beq $s6, $s6, finish
+

asm/src/ELEC4720-2026s2-Ass-02-Demo.s

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+#      $File: NewcastleUniversity/ELEC4720/2026s2/src/Code/Assignment/Ass-02-Demo.s $
+#      $Date: 2026-10-07 01:54:03 +1100 (Wed, 07 Oct 2026) $
+#  $Revision: 2525 $
+#    $Author: Peter $
+#
+#     Course: ELEC4720(2026s2) Programmable Logic Design
+#     School: Engineering
+# University: The University of Newcastle
+#    Address: CALLAGHAN NSW 2308 Australia
+#
+#     Author: Dr Peter Stepien
+#      Email: peter.stepien@newcastle.edu.au
+#  Copyright: 2026
+	
+# Assignment 2 Demonstration Program (all instructions)
+
+	.text
+	.globl main
+	.globl loop
+	.globl finish
+
+main:
+	# Initialise some registers
+	subu $t0, $t0, $t0 # Set t0 = 0 (R8, modified below)
+	addiu $t1, $t0, 7  # Set t1 = 7 (R9)
+
+	# Memory operations
+	sw $t1, 0x10000000($t0) # Save t1 to memory (change to 0x0000 for FPGA)
+	lw $t2, 0x10000000($t0) # Load t2 from memory (change to 0x0000 for FPGA) (R10)
+	
+	# Remaining arithmetic
+	addu $t3, $t1, $t2 # Unsigned t3 = t1 + t2 = 14 (R11)
+	sub $t4, $t1, $t3  # Signed   t4 = t1 - t3 = -7 (R12)
+	addi $t5, $t1, 3   # Signed   t5 = t1 +  3 = 10 (R13)
+	add $t6, $t4, $t5  # Signed   t6 = t4 + t5 =  3 (R14)
+
+	# Logical (t1 = 0000..0111, t5 = 0000..1010)
+	and $s0, $t1, $t5  # s0 = t1 and t5 =   2 (0000..0010) (R16)
+	or $s1, $t1, $t5   # s1 = t1 or  t5 =  15 (0000..1111) (R17)
+	xor $s2, $t1, $t5  # s2 = t1 xor t5 =  13 (0000..1101) (R18)
+	nor $s3, $t1, $t5  # s3 = t1 nor t5 = -16 (1111..0000) (R19)
+
+	# Comparison
+	slt $s4, $t4, $t6  # Signed   s4 = t4 < t6 = 1 (true)  (R20)
+	sltu $s5, $t4, $t6 # Unsigned s5 = t4 < t6 = 0 (false) (R21)
+
+	# Loop to test branch
+loop:
+	addiu $t0, $t0, 1  # Increment counter
+	sltu $s6, $t0, $t5 # Unsigned s6 = t0 < t5 (Last 0) (R22)
+	beq $s6, $s4, loop # Loop if s6 == s4
+
+    # Endless loop at end of program (FPGA)
+finish:
+    # beq $s6, $s6, finish # Endless loop
+    
+    # Alternative system call to exit program (spim)
+	li $v0, 10
+	syscall
+
+# END OF FILE

modules/instruction_counter.sv

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+`ifndef INSTRUCTION_COUNTER_H
+`define INSTRUCTION_COUNTER_H
+
+module instruction_counter #(parameter width=5)(
+    input logic [0:0] clk, input logic [0:0] we,
+    input logic [2**width-1:0] W,
+    output logic [2**width-1:0] addr
+);
+
+    logic [2**width-1:0] pc;
+    always_ff (@posedge clk) begin
+        if (we) begin
+            pc <= W
+        else
+            pc <= pc + 4;
+        end
+    end
+
+    assign addr = pc;
+endmodule
+`endif

modules/register_file.sv

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+`ifndef REGISTER_FILE_H
+`define REGISTER_FILE_H
+
+module register_file #(parameter width=5, parameter nregs=16)(
+    input logic [0:0] clk, input logic[0:0] we,
+    input logic [$clog(nregs)-1:0] A_W1, input logic [2**width-1:0] W1,
+    input logic [$clog(nregs)-1:0] A_R1, output logic [2**width-1:0] R1,
+    input logic [$clog(nregs)-1:0] A_R2, output logic [2**width-1:0] R2
+);
+    localparam BW = 2**width;
+    logic [2**width-1:0] regs[nregs];
+
+    always_ff @(posedge clk) begin
+        if (we & (A_W1 != {(2**width){1'b0}} )) begin
+            regs[A_W1] <= W1;
+        end
+    end
+
+    assign R1 = regs[A_R1];
+    assign R2 = regs[A_R2];
+endmodule
+`endif