fix some bugs

Crop/crop.v

@@ -11,16 +11,16 @@ module crop #(
     input reset,
 
     input in_en,
-    output reg in_que,
+    output in_que,
     input [3 * COLOR_DEPTH - 1:0] data_in,
 
-    output reg out_en,
+    output out_en,
     input out_que,
     output reg [3 * COLOR_DEPTH - 1:0] data_out
 );
-    wire fifo_en;
     wire fifo_full, fifo_empty;
     reg [11:0] cnt_x, cnt_y;
+    reg fifo_en;
 
     async_fifo #(
         .DSIZE(3 * COLOR_DEPTH),
@@ -34,10 +34,12 @@ module crop #(
         .winc(fifo_en),
         .wdata(data_in),
         .wfull(fifo_full),
+        .awfull(),
 
         .rinc(out_en),
         .rdata(data_out),
-        .rempty(fifo_empty)
+        .rempty(fifo_empty),
+        .arempty()
     );
 
     assign in_que = !fifo_full;
@@ -45,10 +47,7 @@ module crop #(
 
     always @(posedge clk or posedge reset) begin
         if (reset) begin
-            in_que <= 0;
-            out_en <= 0;
-            data_out <= 0;
-
+            fifo_en <= 0;
             cnt_x <= 0;
             cnt_y <= 0;