?? counter32b.vhd
字號:
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY COUNTER32B IS
PORT (CLK:IN STD_LOGIC;
CLR:IN STD_LOGIC;
ENA:IN STD_LOGIC;
CQ:OUT INTEGER RANGE 0 TO 15;
CARRY_OUT:OUT STD_LOGIC);
END COUNTER32B;
ARCHITECTURE behav OF COUNTER32B IS
SIGNAL CQI:INTEGER RANGE 0 TO 15;
BEGIN
PROCESS(CLK,CLR,ENA)
BEGIN
IF CLR='1'THEN CQI<=0;
ELSIF CLK'EVENT AND CLK='1'THEN
IF ENA='1'THEN
IF CQI<9 THEN CQI<=CQI+1;
ELSE CQI<=0; END IF;
END IF;
END IF;
END PROCESS;
PROCESS(CQI)
BEGIN
IF CQI=9 THEN CARRY_OUT<='1';
ELSE CARRY_OUT<='0';END IF;
END PROCESS;
CQ<=CQI;
END behav;
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