create program counter

memory/counter/pc.sv

@@ -0,0 +1,27 @@
+import d_flipflop::*;
+
+`include "not16.v"
+
+package pc (
+    input [15:0]in;
+    input load;
+    input inc;
+    input reset;
+    input clk;
+    output [15:0]out;
+);
+
+wire [15:0] zero16 = 15'b0000000000000000;
+wire [15:0] one16 =  15'b0000000000000001;
+
+if (reset == 1)
+    out = zero16;
+else if (load == 1)
+    out = in;
+else if (inc == 1)
+    out = out + one16;
+else
+    out = out;
+end
+
+endpackage