bcd_mux.vhd

来自「包含若干个VHDL小例子」· VHDL 代码 · 共 19 行

--bcd_mux.vhd multiplexer of bcd-selection
library ieee ;
use ieee.std_logic_1164.all;

entity bcd_mux is
port(
  com_clk : in std_logic_vector(1 downto 0);--input count
  bcd_data : in std_logic_vector(15 downto 0);--input display data
  bcd_led : out std_logic_vector(3 downto 0));--output to 7 segment
end bcd_mux;
architecture behavior of bcd_mux is 
begin 
  bcd_led<=bcd_data(3 downto 0) when com_clk="00" else
           bcd_data(7 downto 4) when com_clk="01" else
           bcd_data(11 downto 8) when com_clk="10" else
           bcd_data(15 downto 12);
end behavior;