Update LIFOstack to support 32 memory slots

Also fixed typo on line 15, previous version had a pointer for 16 slots but the memory register only had 4 slots

LIFOstack.v

@@ -10,18 +10,18 @@ output reg [15:0] Dout; // Data being pulled from stack
 output reg empty; // goes high to indicate SP is at 0
 output reg full; // goes high to indicate SP is at (slots)
 
-reg [4:0] SP; // Points to slot to save next value to
+reg [5:0] SP; // Points to slot to save next value to
 integer i;
-reg [15:0] mem [3:0];
+reg [15:0] mem [31:0];
 
 always @ (posedge clk) begin
 		if (!en); // if not enabled, ignore this cycle
 		else begin
 				if (rst) begin // if rst is high, clear memory and reset pointers/outputs
 						Dout = 16'h0000;
-						SP = 4'b0000;
+						SP = 6'b000000;
 						empty = 1'b1;
-						for (i = 0; i < 16; i = i + 1) begin
+						for (i = 0; i < 32; i = i + 1) begin
 							mem[i] = 16'h0000;
 							end
 					end
@@ -29,7 +29,7 @@ always @ (posedge clk) begin
 						if (!full && rw) begin // Write when NOT full & Writing
 								mem[SP] = Din; // Store data into current slot
 								SP = SP + 1'b1; // Increment stack pointer to next empty slot
-								full = (SP == 5'b10000) ? 1 : 0; // Stack is full if SP is (slots)
+								full = (SP == 6'b100000) ? 1 : 0; // Stack is full if SP is (slots)
 								empty = 1'b0; // Stack is never empty after a push
 							end
 						else if (!empty && !rw) begin // Read when NOT empty & reading
@@ -37,7 +37,7 @@ always @ (posedge clk) begin
 								Dout = mem[SP]; // Output data from last filled slot
 								mem[SP] = 16'h0000; // Clear slot after setting output
 								full = 1'b0; // Stack is never full after a pop
-								empty = (SP == 5'b00000) ? 1 : 0; // Stack is empty if SP is 0
+								empty = (SP == 6'b000000) ? 1 : 0; // Stack is empty if SP is 0
 							end
 					end
 			end