Subversion Repositories gpib_controller

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--This file is part of fpga_gpib_controller.
--
-- Fpga_gpib_controller 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.
--
-- Fpga_gpib_controller 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 Fpga_gpib_controller.  If not, see <http://www.gnu.org/licenses/>.
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-- Entity: SinglePulseGenerator
-- Date:2011-11-10  
-- Author: Andrzej Paluch
--
-- Description ${cursor}
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library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
 
use work.utilPkg.all;
 
 
entity SinglePulseGenerator is
	generic (
		WIDTH : integer := 3
	);
 
	port (
		reset : in std_logic;
		clk : in std_logic;
		t_in: in std_logic;
		t_out : out std_logic;
		pulse : out std_logic
	);
end SinglePulseGenerator;
 
architecture arch of SinglePulseGenerator is
 
	signal rcount : integer range 0 to WIDTH;
	signal i_t_out : std_logic;
 
begin
 
	pulse <= to_stdl(t_in /= i_t_out);
	t_out <= i_t_out;
 
	-- buffer reset generator
	process (reset, clk, t_in) begin
		if reset = '1' then
			i_t_out <= t_in;
			rcount <= 0;
		elsif rising_edge(clk) then
			if t_in /= i_t_out then
				rcount <= rcount + 1;
 
				if rcount = WIDTH then
					rcount <= 0;
					i_t_out <= t_in;
				end if;
			end if;
		end if;
	end process;
 
end arch;