PPT Slide

architecture a of control_alt is

-- FFs for Finite State Machine

signal q, d : std_logic_vector(5 downto 0);

constant S0: std_logic_vector(5 downto 0) := "000001";

constant S1: std_logic_vector(5 downto 0) := "000010";

constant S2: std_logic_vector(5 downto 0) := "000100";

constant S3: std_logic_vector(5 downto 0) := "001000";

constant S4: std_logic_vector(5 downto 0) := "010000";

constant S5: std_logic_vector(5 downto 0) := "100000";

begin

-- State Flip Flops

stateff: process (clk,reset)

begin

if (reset = '1') then

q <= S0;

elsif (clk'event and clk='1') then

q <= d;

end if;

end process stateff;

Will define symbolic names for the states.

To use new state encoding, only have to change definition of symbolic names!

This uses one-hot encoding.