跪求啊！！用VHDL如何编译一个256*8的ROM，急用啊！望大虾们多多帮忙啊~~最好有程序的！

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解决时间 2021-04-27 22:37

提问者网友：浩歌待明月
2021-04-27 08:12

最佳答案

五星知识达人网友：神也偏爱
2021-04-27 09:27

xilinx还是altera的，一般RAM/ROM都是自带IP的，你生成256*8的ROM就自动生成代码了。

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1楼网友：十鸦
2021-04-27 10:43

(刚刚复习考试，在老师ppt上看的，给你作参考容量稍微改下吧，)
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity rams_21a is
port (clk : in std_logic;
en : in std_logic;
addr : in std_logic_vector(5 downto 0);
data : out std_logic_vector(19 downto 0));
end rams_21a;
architecture syn of rams_21a is
type rom_type is array (63 downto 0) of std_logic_vector (19 downto 0);
signal ROM : rom_type:= (X"0200A", X"00300", X"08101", X"04000",
X"08601", X"0233A",X"00300", X"08602", X"02310", X"0203B", X"08300",
X"04002",X"08201", X"00500", X"04001", X"02500", X"00340",X"00241",X"04002",
X"08300", X"08201", X"00500", X"08101", X"00602",X"04003", X"0241E",
X“00301”, X"00102", X"02122", X"02021",X"00301", X"00102", X"02222",
X"04001", X"00342", X"0232B",X"00900", X"00302", X"00102", X"04002",
X"00900", X"08201",X"02023", X"00303", X"02433", X"00301", X"04004",
X"00301",X"00102", X"02137",X"02036", X"00301", X"00102", X"02237",
X"04004", X"00304", X"04040", X"02500", X"02500", X"02500",X"0030D",
X"02341", X"08201", X"0400D");
begin
process (clk)
begin
　if rising_edge(clk) then
　　if (en = '1') then
　　　data <= ROM(conv_integer(addr));
　　end if;
　end if;
end process;
end syn;

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