lpm_latch2.vhd

CPLD的例子程序1,EPM7128芯片,ISA总线

LIBRARY ieee;
USE ieee.std_logic_1164.all;

LIBRARY lpm;
USE lpm.lpm_components.all;

ENTITY lpm_latch2 IS
	PORT
	(
		data		: IN STD_LOGIC ;
		gate		: IN STD_LOGIC ;
		aclr		: IN STD_LOGIC ;
		q		: OUT STD_LOGIC 
	);
END lpm_latch2;


ARCHITECTURE SYN OF lpm_latch2 IS

	SIGNAL sub_wire0	: STD_LOGIC_VECTOR (0 DOWNTO 0);
	SIGNAL sub_wire1	: STD_LOGIC ;
	SIGNAL sub_wire2	: STD_LOGIC ;
	SIGNAL sub_wire3	: STD_LOGIC_VECTOR (0 DOWNTO 0);



	COMPONENT lpm_latch
	GENERIC (
		lpm_width		: NATURAL;
		lpm_type		: STRING
	);
	PORT (
			aclr	: IN STD_LOGIC ;
			q	: OUT STD_LOGIC_VECTOR (0 DOWNTO 0);
			data	: IN STD_LOGIC_VECTOR (0 DOWNTO 0);
			gate	: IN STD_LOGIC 
	);
	END COMPONENT;

BEGIN
	sub_wire1    <= sub_wire0(0);
	q    <= sub_wire1;
	sub_wire2    <= data;
	sub_wire3(0)    <= sub_wire2;

	lpm_latch_component : lpm_latch
	GENERIC MAP (
		lpm_width => 1,
		lpm_type => "LPM_LATCH"
	)
	PORT MAP (
		aclr => aclr,
		data => sub_wire3,
		gate => gate,
		q => sub_wire0
	);



END SYN;