add FIFO files

read_pointer.v

@@ -0,0 +1,21 @@
+module read_pointer(
+    output  [4:0]   rptr,
+    output          fifo_rd,
+    input           rd,
+    input           fifo_empty,
+    input           clk,
+    input           rst_n);  
+   
+    reg     [4:0]   rptr;  
+    
+    assign fifo_rd = (~fifo_empty)& rd;  
+
+    always @(posedge clk or negedge rst_n)  
+    begin  
+        if(~rst_n) rptr <= 'b0;  
+        else if(fifo_rd)  
+            rptr <= rptr + 'b1;  
+        else  
+            rptr <= rptr;  
+    end  
+endmodule