diff --git a/.gitignore b/.gitignore
index 397b4a7..dc313db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 *.log
+*.jed
diff --git a/src/ft2004_top.v b/src/ft2004_top.v
index c2aaa80..a12b13c 100644
--- a/src/ft2004_top.v
+++ b/src/ft2004_top.v
@@ -194,6 +194,8 @@ always @(posedge clk_1k) begin
 end
 
 // enable various votage groups.
+// if `time_en == 1'b0, msclk_count always equal to `0`
+// so power pins will stable.
 always @(posedge clk_1k) begin
     if (!power_on) begin
         case(msclk_count)
@@ -213,7 +215,7 @@ always @(posedge clk_1k) begin
                 power_on <= 1; 
             end
         endcase
-    end else if (power_on == 1) begin
+    end else begin
         case (msclk_count)
             16'd10: begin
                 pcierst     <= 4'h0;
@@ -229,7 +231,6 @@ always @(posedge clk_1k) begin
             16'd310: pwr_3v3_en <= 1'b0;
             16'd1000: power_on  <= 1'b0;
         endcase
-    end else begin
     end
 end