rom.vhd

来自「清华大学Altera FPGA工程师成长手册（光盘视频）」· VHDL 代码 · 共 61 行

LIBRARY ieee;												//使用标准库文件
USE ieee.std_logic_1164.all;
LIBRARY altera_mf;
USE altera_mf.all;
ENTITY ROM IS												//定义主体
	PORT													//定义端口
	(
		address	: IN STD_LOGIC_VECTOR (4 DOWNTO 0);
		clock		: IN STD_LOGIC ;
		q		: OUT STD_LOGIC_VECTOR (7 DOWNTO 0)
	);
END ROM;
ARCHITECTURE SYN OF rom IS
	SIGNAL sub_wire0	: STD_LOGIC_VECTOR (7 DOWNTO 0);
	COMPONENT altsyncram
	GENERIC (
		clock_enable_input_a		: STRING;
		clock_enable_output_a		: STRING;
		init_file		: STRING;
		intended_device_family		: STRING;
		lpm_hint		: STRING;
		lpm_type		: STRING;
		numwords_a		: NATURAL;
		operation_mode		: STRING;
		outdata_aclr_a		: STRING;
		outdata_reg_a		: STRING;
		widthad_a		: NATURAL;
		width_a		: NATURAL;
		width_byteena_a		: NATURAL
	);
	PORT (													//端口定义
			clock0	: IN STD_LOGIC ;
			address_a: IN STD_LOGIC_VECTOR (4 DOWNTO 0);
			q_a	: OUT STD_LOGIC_VECTOR (7 DOWNTO 0)
	);
	END COMPONENT;
BEGIN
	q    <= sub_wire0(7 DOWNTO 0);
	altsyncram_component : altsyncram
	GENERIC MAP (
		clock_enable_input_a => "BYPASS",
		clock_enable_output_a => "BYPASS",
		init_file => "D:/ASHU/VHDL程序库/宏模块及IP核的使用/RAM/lpm_ram.mif",
		intended_device_family => "Cyclone II",
		lpm_hint => "ENABLE_RUNTIME_MOD=YES, INSTANCE_NAME=ROM1",
		lpm_type => "altsyncram",
		numwords_a => 32,
		operation_mode => "ROM",
		outdata_aclr_a => "NONE",
		outdata_reg_a => "CLOCK0",
		widthad_a => 5,
		width_a => 8,
		width_byteena_a => 1
	);
	PORT MAP (												//端口映射
		clock0 => clock,
		address_a => address,
		q_a => sub_wire0
	);
END SYN;