LIBRARY IEEE; USE IEEE.std_logic_1164.ALL; USE IEEE.std_logic_unsigned.ALL; USE IEEE.std_logic_arith.ALL; ENTITY step_motor IS PORT( f, p, d: INSTD_LOGIC:='0'; speed : inSTD_LOGIC_VECTOR(1 downto 0); coil : OUTSTD_LOGIC_VECTOR(3 downto 0) ); END step_motor; ARCHITECTURE behavior OF s .. [查看全文]