URL https://opencores.org/ocsvn/i2c_to_wb/i2c_to_wb/trunk

Subversion Repositories i2c_to_wb

[/] [i2c_to_wb/] [trunk/] [src/] [glitch_filter.v] - Blame information for rev 2

Line No.	Rev	Author	Line
1	2	qaztronic	`// --------------------------------------------------------------------`
2			`//`
3			`// --------------------------------------------------------------------`
4
5
6			`include "timescale.v"
7
8
9			`module`
10			`glitch_filter`
11			`#(`
12			`parameter SIZE = 3`
13			`)`
14			`(`
15			`input in,`
16			`output reg out,`
17
18			`output rise,`
19			`output fall,`
20
21			`input clk,`
22			`input rst`
23			`);`
24
25
26			`// --------------------------------------------------------------------`
27			`// in sync flop`
28			`reg in_reg;`
29			`always @(posedge clk)`
30			`in_reg <= in;`
31
32
33			`// --------------------------------------------------------------------`
34			`// glitch filter`
35			`reg [(SIZE-1):0] buffer;`
36			`always @(posedge clk)`
37			`buffer <= { buffer[(SIZE-2):0], in_reg };`
38
39			`wire all_hi = &{in_reg, buffer};`
40			`wire all_lo = ~\|{in_reg, buffer};`
41
42			`wire out_en = (all_hi & in_reg) \| (all_lo & ~in_reg);`
43
44			`always @(posedge clk)`
45			`if( out_en )`
46			`out <= buffer[(SIZE-1)];`
47
48
49			`// --------------------------------------------------------------------`
50			`// outputs`
51			`assign fall = all_lo & out;`
52			`assign rise = all_hi & ~out;`
53
54
55			`endmodule`
56