---实现的部分VHDL 程序如下。 　　--- elsif clk1x event and clk1x = 1 then ---if std_logic_vector(length_no) >= “0001” and std_logic_vector(length_no) <= “1001” then -----数据帧数据由接收串行数据端移位入接收移位寄存器---rsr(0) <= rxda --- rsr(7 downto 1) <= rsr(6 down

library ieee use ieee.std_logic_1164.all entity decoder is port (clk:in std_logic clr:in std_logic data_in:in std_logic --待解码信元输入端； data_out:out std_logic) --解码信元输出端； end decoder architecture behave of decoder is component dff2