add autoreset of gear shift and enable counters

IP_wrappers/PLL_integration_layer.v

@@ -111,13 +111,14 @@ always @(posedge ref_clk or negedge resetn) begin
             if (gear_shift_counter>16'h3E88) begin
                 gear_shift_counter = 16'h0000;
             end
-        end else begin
-            if(((enp_reg==1'b0)||(enr_reg==1'b0))&&(pll_rst==1'b1)) begin
+        end else if(((enp_reg==1'b0)||(enr_reg==1'b0))&&(pll_rst==1'b1)) begin
                 enable_counter = enable_counter+1;
                 if(enable_counter>16'h2718) begin
                     enable_counter = 16'h0000;
                 end
-            end
+        end else begin 
+            gear_shift_counter = 16'd0;
+            enable_counter = 16'd0;
         end
     end    
 end
@@ -202,20 +203,10 @@ always @(*) begin
                     end
                 end
                 10'h001: begin
-                    if(PSTRB[0]==1'b1) begin
-                        gear_shift_counter[7:0] = PWDATA[7:0]; 
-                    end 
-                    if(PSTRB[1]==1'b1) begin 
-                        gear_shift_counter[15:8] = PWDATA[15:8];
-                    end   
+                    PSLVERR_reg=1'b1;
                 end
                 10'h002: begin
-                    if(PSTRB[0]==1'b1) begin
-                        enable_counter[7:0] = PWDATA[7:0]; 
-                    end 
-                    if(PSTRB[1]==1'b1) begin 
-                        enable_counter[15:8] = PWDATA[15:8];
-                    end   
+                    PSLVERR_reg=1'b1;
                 end
                 10'h003: begin
                     if(PSTRB[0]==1'b1)