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-------------------------------------------------------------------------------
-- Module : de1_cntdn
-------------------------------------------------------------------------------
-- Author : Johann Faerber
-- Company : University of Applied Sciences Augsburg
-------------------------------------------------------------------------------
-- Description: test the module cntdn on a DE1 prototype board
-- connecting device under test (DUT) cntdn
-- to input/output signals of the DE1 prototype board
-------------------------------------------------------------------------------
-- Revisions : see end of file
-------------------------------------------------------------------------------
LIBRARY IEEE;
USE IEEE.std_logic_1164.ALL;
ENTITY de1_cntdn IS
PORT (
CLOCK_50 : IN std_ulogic; -- 50 MHz Clock
KEY : IN std_ulogic_vector(1 DOWNTO 0); -- KEY[1:0]
-- KEY[0] = rst_ni
-- KEY[1] = en_pi
GPO_1 : OUT std_ulogic_vector(5 DOWNTO 0) -- Output Connector GPIO_1
-- GPO_1[3:0] = count_o
-- GPO_1[4] = tc_o
-- GPO_1[5] = clk_i
);
END de1_cntdn;
ARCHITECTURE structure OF de1_cntdn IS
COMPONENT cntdn
PORT (
clk_i : IN std_ulogic;
rst_ni : IN std_ulogic;
en_pi : IN std_ulogic;
count_o : OUT std_ulogic_vector(3 DOWNTO 0);
tc_o : OUT std_ulogic);
END COMPONENT;
SIGNAL clk_i : std_ulogic;
SIGNAL rst_ni : std_ulogic;
SIGNAL en_pi : std_ulogic;
SIGNAL count_o : std_ulogic_vector(3 DOWNTO 0);
SIGNAL tc_o : std_ulogic;
BEGIN
-- connecting clock generator master clock of synchronous system
clk_i <= CLOCK_50;
GPO_1(5) <= clk_i; -- to measure clk signal
-- connecting asynchronous system reset to digital system
rst_ni <= KEY(0);
-- count enable input is high-active, KEY(1) ist low-aktive, therefore ...
-- ... if KEY1 is released, high signal is produced
en_pi <= KEY(1);
-- connecting device under test with peripheral elements
DUT : ENTITY work.cntdn(rtl)
PORT MAP (
clk_i => clk_i,
rst_ni => rst_ni,
en_pi => en_pi,
count_o => count_o,
tc_o => tc_o);
-- connecting count value to GPIO1
GPO_1(3 DOWNTO 0) <= count_o;
GPO_1(4) <= tc_o;
END structure;
-------------------------------------------------------------------------------
-- Revisions:
-- ----------
-- $Id:$
-------------------------------------------------------------------------------
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