![]() If there is no reset state, the state machine is initialized to the first state in the Type Declaration. The declaration of the type STATE_TYPE defines the states s0, s1, and s2 for state_machine.Īt startup, the state machine is initialized to the reset state. The signal state stores the current state of the state machine. Note: The Compiler also recognizes state machines with a synchronous reset. This state machine has an asynchronous reset, which the Compiler recognizes. This state machine includes a Process Statement that is activated on every positive edge of the clk control signal for the next-state logic, and a Process Statement that is activated on a change in the state variable. Output : OUT STD_LOGIC_VECTOR(1 downto 0)) ![]() The VHDL example shown below implements a 3-state state machine. ![]() To describe a state machine in Quartus II VHDL, you can declare an enumeration type for the states, and use a Process Statement for the state register and the next-state logic. A state machine is a sequential circuit that advances through a number of states.
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