用VHDL设计一个四路数据选择器,具体功能为:输入四路数据a,b,c,d,根据片选信号s1,s2,选择其中一路作为输出y。用的EDA实验板为EP2C5T144C8
时间: 2024-09-17 17:08:52 浏览: 34
在VHDL设计中,我们可以创建一个名为`FourWaySelector`的数据选择器模块,它接收四个输入数据(a、b、c、d)和两个控制信号(s1和s2),然后根据这些信号的选择来生成输出y。对于EP2C5T144C8这样的FPGA平台,我们需要考虑它的IO资源限制和布线逻辑。
```vhdl
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity FourWaySelector is
Port ( a : in STD_LOGIC; -- Input A
b : in STD_LOGIC; -- Input B
c : in STD_LOGIC; -- Input C
d : in STD_LOGIC; -- Input D
s1 : in STD_LOGIC; -- Select line 1
s2 : in STD_LOGIC; -- Select line 2
y : out STD_LOGIC); -- Output Y
end FourWaySelector;
architecture Behavioral of FourWaySelector is
begin
process (s1, s2)
variable selected_data : STD_LOGIC := 'X'; -- Initialize with an unknown value
begin
if s1 = '1' and s2 = '0' then
selected_data <= a; -- If S1=1 & S2=0, select A
elsif s1 = '0' and s2 = '1' then
selected_data <= b; -- If S1=0 & S2=1, select B
elsif s1 = '0' and s2 = '0' then
selected_data <= c; -- If both S1 and S2 are low, select C
else
selected_data <= d; -- Default case, select D
end if;
y <= selected_data; -- Assign the selected data to output Y
end process;
end Behavioral;
--