1 /*********************************************************************************
2 * Company :
3 * Engineer : 空气微凉
4 *
5 * Create Date : 00:00:00 22/03/2013
6 * Design Name :
7 * Module Name :
8 * Project Name :
9 * Target Devices :
10 * Tool versions :
11 * Description :
12 * http://www.cnblogs.com/kongqiweiliang/
13 * Dependencies :
14 *
15 * Revision :
16 * Revision : 0.01 - File Created
17 * Additional Comments : 基础实验_10_移位寄存器 ：常见普通移位寄存器
18 ********************************************************************************/
19 `timescale 1ns/1ps
20 `define UD #1
21 /*******************************************************************************/
22 module SHIFT_REG
23 (
24 //system interface
25 input iCLK_50 ,//50MHz
26 input iRESET ,//system interface
27 //Interface package
28 input iDAT_EN ,//
29 input iDAT ,//
30 output oDAT //
31 );
32 //-------------------------------------------------------------------------------
33 reg [7:0] SHIFT_REG;
34 reg [7:0] SHIFT_REG_N;
35 always@(posedge iCLK_50 or negedge iRESET)begin
36 if(!iRESET)
37 SHIFT_REG <= 8\'h0;
38 else
39 SHIFT_REG <= SHIFT_REG_N;
40 end
41 always@(*)begin
42 if(iDAT_EN == 1\'h1)
43 SHIFT_REG_N = {SHIFT_REG[7:1],iDAT};
44 else
45 SHIFT_REG_N = SHIFT_REG;
46 end
47
48 assign oDAT = SHIFT_REG[7];
49 //-------------------------------------------------------------------------------
50 endmodule