mirror of
https://github.com/Klagarge/Cursor.git
synced 2024-11-23 09:53:29 +00:00
51 lines
1.7 KiB
VHDL
51 lines
1.7 KiB
VHDL
|
--------------------------------------------------------------------------------
|
||
|
|
-- Copyright 2014 HES-SO Valais Wallis (www.hevs.ch)
|
||
|
|
--
|
||
|
|
-- This program is free software: you can redistribute it and/or modify
|
||
|
|
-- it under the terms of the GNU General Public License as published by
|
||
|
|
-- the Free Software Foundation; either version 3 of the License, or
|
||
|
|
-- (at your option) any later version.
|
||
|
|
--
|
||
|
|
-- This program IS distributed in the hope that it will be useful,
|
||
|
|
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
-- GNU General Public License for more details.
|
||
|
|
-- You should have received a copy of the GNU General Public License along with
|
||
|
|
-- this program. If not, see <http://www.gnu.org/licenses/>
|
||
|
|
--------------------------------------------------------------------------------
|
||
|
|
-- EdgeDetector
|
||
|
|
-- Detect rising and falling edges of a signal.
|
||
|
|
--
|
||
|
|
-- Created on 2014-04-02
|
||
|
|
--
|
||
|
|
-- Version: 1.0
|
||
|
|
-- Author: Oliver A. Gubler (oliver.gubler@hevs.ch)
|
||
|
|
--------------------------------------------------------------------------------
|
||
|
|
ARCHITECTURE arch OF edgeDetector IS
|
||
|
|
|
||
|
|
SIGNAL signal_s : std_ulogic;
|
||
|
|
SIGNAL rising_detected_s : std_ulogic;
|
||
|
|
SIGNAL falling_detected_s : std_ulogic;
|
||
|
|
|
||
|
|
BEGIN
|
||
|
|
|
||
|
|
-- sync
|
||
|
|
reg : PROCESS (reset,clock)
|
||
|
|
BEGIN
|
||
|
|
IF reset = '1' THEN
|
||
|
|
signal_s <= '0';
|
||
|
|
ELSIF rising_edge(clock) THEN
|
||
|
|
signal_s <= input;
|
||
|
|
END IF;
|
||
|
|
END PROCESS reg ;
|
||
|
|
|
||
|
|
-- edge detection
|
||
|
|
rising_detected_s <= input AND NOT signal_s;
|
||
|
|
falling_detected_s <= NOT input AND signal_s;
|
||
|
|
|
||
|
|
-- output
|
||
|
|
rising_detected <= rising_detected_s;
|
||
|
|
falling_detected <= falling_detected_s;
|
||
|
|
|
||
|
|
END ARCHITECTURE arch;
|