update JT12

rtl/sound/jt12/jt12_sh.v

@@ -18,13 +18,12 @@
 	Date: 1-31-2017
 	*/
 
-`timescale 1ns / 1ps
 
 // stages must be greater than 2
 module jt12_sh #(parameter width=5, stages=24 )
 (
 	input 				clk,
-	input				clk_en,
+	input				clk_en /* synthesis direct_enable */,
 	input	[width-1:0]	din,
    	output	[width-1:0]	drop
 );