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22 Feb 2012 Finite State Machines. ? Thus far, sequential circuit (counter and register) outputs limited to state variables. ? In general, sequential circuits (or Finite State. Machines, FSM's) have outputs in addition to the state variables. ? For example, vending machine controllers generate output signals to dispense
Moore Machines. 0 A Moore machine is a collection of 5 things: 1. a finite set of states q. 0. ,q. 1. ,q. 2. ,, where q. 0 is designated the start state Example states = {q. 0. ,q. 1. ,q. 2. ,q. 3. } ?={a,b}. ?={0,1}. Old state Output by the. New state old state. After input a After input b. –q. 0. 1 q. 1 q. 3 q. 1. 0 q. 3 q. 1 q. 2. 0 q. 0 q. 3 q.
output out; parameter zero = 2'b00; parameter one1 = 2'b01; parameter two1s = 2'b10; reg out; reg [2:1] state;. // state variables reg [2:1] next_state; always @(posedge clk) if (reset) state = zero; else state = next_state; state assignment. (easy to change, if in one place). Verilog FSM - Reduce 1s example. Moore machine. 1.
Summer 2007. Page 2 of 8. Example: Design a simple sequence detector for the sequence 011. Include three outputs that indicate how many bits have been received in the correct sequence. (For example, each output could be connected to an LED.) 1) Draw a State Diagram (Moore) and then assign binary State Identifiers.
1. C. C. 0. 0. 0. D. E. 1. 0. 1. D. C. 1. 0. 0. E. B. 1. 0. 1. E. D. 1. Specifying Outputs for a Moore Machine. ? Output is only function of state. ? Specify in state bubble in state diagram. ? Example: sequence detector for 01 or 10. CS 150 - Fall 2005 – Lec #7: Sequential Implementation – 4 current next reset input state state output.
Moore machine with no output decoding outputs computed on transition to next state rather than after entering view outputs as expanded state vector. Inputs. Outputs. Current State output logic next state logic. Vending. Machine. FSM. N. D. Reset. Clock. Open. Coin. Sensor. Release. Mechanism. Example: vending machine.
The state transition arrows of Moore machine are labeled with the input value that triggers such transition. Since a Mealy machine associates outputs with transitions, an output sequence can be generated in fewer states using Mealy machine as compared to Moore machine. This was illustrated in the previous example. 2
Determine the number of different output associated with qi in the next state column. 2.> we split qi into different states according to different output associated with it. for ex. suppose in the next state column of the above sample transition table of mealy machine, the output associated with q1 is "0" in the first next state column
Mealy machine. • Sequential system where output depends on current input and state. • Moore machine. • Sequential system where output depends only on .. FSM EXAMPLES. EXAMPLE #1. FINITE STATE MACHINES. •SEQUENTIAL CIRCUITS. •FSM EXAMPLES. -EXAMPLE #1. • Now draw a circle with each state. S.
Mealy and Moore Machines. (excerpted from www.cs.umd.edu/class/spring2003/cmsc311/Notes/Seq/fsm.html) and web.njit.edu/~marvin/cis341/chap08.pdf ). The output from a Mealy machine is labelled on the state transitions, and depends on both the state and the input. The output from a Moore machine is
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