dataram.vhd

PIC源代码很不错

-- DATARAM.vhd (LPM version)
-- Data RAM of CQPIC (PIC16F84)
-- (1) Version 1.00a		Nov 1 1999
--
-- Copyright(c)1999-2002 Sumio Morioka
-- e-mail:[e-mail], URL:http://www02.so-net.ne.jp/~morioka/cqpic.htm

-- 拲堄丗偙偺僼傽僀儖偼ALTERA梡偱偡丏Xilinx偺応崌偼CoreGenerator偱儊儌儕傪惗惉偟偰巊偭偰偔偩偝偄丏
-- 偦偺偲偒丆弌椡懁偼儗僕僗僞晅偒偱擖椡懁偼儗僕僗僞側偟乮偮傑傝儗僀僥儞僔侾僋儘僢僋乯偲偟偰偔偩偝偄丏

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
library lpm;
use lpm.lpm_components.all;

entity dataram is
	port (
		addr	: in  std_logic_vector(8 downto 0);
		read	: in  std_logic;
		write	: in  std_logic;
		clk		: in  std_logic;
		datain	: in  std_logic_vector(7 downto 0);
		dataout	: out std_logic_vector(7 downto 0)
	);
end dataram;

architecture RTL of dataram is
begin
	RAM: lpm_ram_dq
		generic map (
--			LPM_WIDTHAD  => 9,			-- Full implementation of BANK3-0
			LPM_WIDTHAD  => 7,			-- BANK0 only
			LPM_WIDTH 	 => 8,
			LPM_INDATA 	 => "UNREGISTERED",
			LPM_ADDRESS_CONTROL => "UNREGISTERED",
			LPM_OUTDATA  => "REGISTERED"
		)
		port map (
			data    => datain,
--			address => addr,				-- Full implementation of BANK3-0
			address => addr(6 downto 0),	-- BANK0 only
--			inclock	=> clk,
			outclock=> clk,
			we      => write,
			q		=> dataout
		);
end RTL;