填空完成下面的程序,该case语句实现了控制一个7段共阴极数码管的显示功能,输入信号a从“0000”到“1111”共16种组合,对应着要显示的字符为0-9,A-F. case a (3 downto 0 ) is when "0000"=> led7s<= "0111111"; when "0001"=> led7s<= 1 ____ ; when "0010"=> led7s<= "1011011"; when "0011"=> led7s<= "1001111"; when "0100"=> led7s<= "1100110"; when "0101"=> led7s<= "1101101"; when "0110"=> led7s<= "1111101"; when "0111"=> led7s<= "0000111"; when "1000"=> led7s<= 2 ; when "1001"=> led7s<= "1101111"; when "1010"=> led7s<= "1110111"; when "1011"=> led7s<= "1111100"; when "1100"=> led7s<= "0111001"; when "1101"=> led7s<= "1011110"; when "1110"=> led7s<= "1111001"; when "1111"=> led7s<= 3 ; when others=> nulL; end case;
时间: 2023-10-16 10:06:30 浏览: 32
case a(3 downto 0) is
when "0000" => led7s <= "0111111";
when "0001" => led7s <= "0000110";
when "0010" => led7s <= "1011011";
when "0011" => led7s <= "1001111";
when "0100" => led7s <= "1100110";
when "0101" => led7s <= "1101101";
when "0110" => led7s <= "1111101";
when "0111" => led7s <= "0000111";
when "1000" => led7s <= "1111111";
when "1001" => led7s <= "1101111";
when "1010" => led7s <= "1110111";
when "1011" => led7s <= "1111100";
when "1100" => led7s <= "0111001";
when "1101" => led7s <= "1011110";
when "1110" => led7s <= "1111001";
when "1111" => led7s <= "1110001";
when others => null;
end case;
在这个程序中,第2个和第16个when语句需要填空。
第2个when语句中,输入信号a为"0001"时,需要显示数字1,对应的7段共阴极数码管的段码为"0000110"。
第16个when语句中,输入信号a为"1111"时,需要显示字符E,对应的7段共阴极数码管的段码为"1110001"。
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