xianshi.vhd

利用FPGA编写的键盘译码程序

             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1101111100000000";
             when "1011"=>q<="1101101100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1111101100000000";
             when "1110"=>q<="1111101100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00010011"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="0000000000000000";
             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1101101100000000";
             when "1011"=>q<="1101101100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00010100"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="0000000000000000";
             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1111100000000000";
             when "1011"=>q<="1111100000000000";
             when "1100"=>q<="0001100000000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00010101"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="0000000000000000";
             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1111101100000000";
             when "1011"=>q<="1111101100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1101111100000000";
             when "1110"=>q<="1101111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;

when "00010110"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="0000000000000000";
             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1111111100000000";
             when "1011"=>q<="1111111100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1101101100000000";
             when "1110"=>q<="1101111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00010111"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="0000000000000000";
             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1100000000000000";
             when "1011"=>q<="1100000000000000";
             when "1100"=>q<="1100000000000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00011000"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="0000000000000000";
             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1111111100000000";
             when "1011"=>q<="1111111100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
  when "00011001"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="0000000000000000";
             when "0110"=>q<="0000000000000000";
             when "0111"=>q<="0000000000000000";
             when "1000"=>q<="1111111100000000";
             when "1001"=>q<="1111111100000000";

             when "1010"=>q<="1111101100000000";
             when "1011"=>q<="1111101100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00100000"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="1101111100000000";
             when "0110"=>q<="1101101100000000";
             when "0111"=>q<="1101101100000000";
             when "1000"=>q<="1101101100000000";
             when "1001"=>q<="1111101100000000";

             when "1010"=>q<="1111111100000000";
             when "1011"=>q<="1111111100000000";
             when "1100"=>q<="1100001100000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00100001"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="1101111100000000";
             when "0110"=>q<="1101101100000000";
             when "0111"=>q<="1101101100000000";
             when "1000"=>q<="1101101100000000";
             when "1001"=>q<="1111101100000000";

             when "1010"=>q<="0000000000000000";
             when "1011"=>q<="0000000000000000";
             when "1100"=>q<="0000000000000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00100010"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="1101111100000000";
             when "0110"=>q<="1101101100000000";
             when "0111"=>q<="1101101100000000";
             when "1000"=>q<="1101101100000000";
             when "1001"=>q<="1111101100000000";

             when "1010"=>q<="1101111100000000";
             when "1011"=>q<="1101101100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1111101100000000";
             when "1110"=>q<="1111101100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00100011"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="1101111100000000";
             when "0110"=>q<="1101101100000000";
             when "0111"=>q<="1101101100000000";
             when "1000"=>q<="1101101100000000";
             when "1001"=>q<="1111101100000000";

             when "1010"=>q<="1101101100000000";
             when "1011"=>q<="1101101100000000";
             when "1100"=>q<="1101101100000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
when "00100100"=>
           case sel is
             when "0000"=>q<="0000000000000000";
             when "0001"=>q<="0000000000000000";
             when "0010"=>q<="0000000000000000";
             when "0011"=>q<="0000000000000000";
             when "0100"=>q<="0000000000000000";

             when "0101"=>q<="1101111100000000";
             when "0110"=>q<="1101101100000000";
             when "0111"=>q<="1101101100000000";
             when "1000"=>q<="1101101100000000";
             when "1001"=>q<="1111101100000000";

             when "1010"=>q<="1111100000000000";
             when "1011"=>q<="1111100000000000";
             when "1100"=>q<="0001100000000000";
             when "1101"=>q<="1111111100000000";
             when "1110"=>q<="1111111100000000";

             when "1111"=>q<="0000000000000000";
             when others=>null;
          end case;
     when others=>null;
    end case;
 end process;
end rt1;