?? ftctrl.vhd
字號:
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY FTCTRL IS
PORT (CLK:IN STD_LOGIC;
TSTEN:OUT STD_LOGIC;
CLR_CNT:OUT STD_LOGIC;
LOAD:OUT STD_LOGIC );
END FTCTRL;
ARCHITECTURE behav OF FTCTRL IS
SIGNAL Div2CLK :STD_LOGIC;
BEGIN
PROCESS(CLK)
BEGIN
IF CLK'EVENT AND CLK='1'THEN
Div2CLK<=NOT Div2CLK;
END IF;
END PROCESS;
PROCESS (CLK,Div2CLK)
BEGIN
IF CLK='0' AND Div2CLK='0' THEN CLR_CNT<='1';
ELSE CLR_CNT<='0';END IF;
END PROCESS;
LOAD <= NOT Div2CLK; TSTEN<=Div2CLK;
END behav;
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