verilog ASM

Verilog ASM (Asynchronous State Machine) refers to the use of Verilog hardware description language to describe and implement asynchronous state machines. In Verilog, an asynchronous state machine is typically defined using combinational logic and flip-flops to represent different states and transitions.

To implement an asynchronous state machine in Verilog, you would define a module that includes the state register and combinational logic to determine the next state based on the current state and inputs. Here's an example of a simple Verilog ASM:

module ASM_example (
  input wire clk,
  input wire reset,
  input wire inputA,
  input wire inputB,
  output wire output
);

  reg [1:0] state;

  always @(posedge clk or posedge reset) begin
    if (reset)
      state <= 2'b00;
    else begin
      case (state)
        2'b00: begin
          if (inputA && inputB)
            state <= 2'b01;
          else if (inputA)
            state <= 2'b10;
          else
            state <= 2'b00;
        end
        2'b01: begin
          state <= 2'b11;
        end
        2'b10: begin
          state <= 2'b00;
        end
        2'b11: begin
          state <= 2'b00;
        end
      endcase
    end
  end

  assign output = (state == 2'b01);

endmodule

In this example, we have a 2-bit state register (`state`) that represents four different states: `00`, `01`, `10`, and `11`. The combinational logic inside the `always` block determines the next state based on the current state and inputs (`inputA` and `inputB`). The `output` wire is assigned based on the current state, in this case, it is `1` when the state is `01`.

Please note that this is just a simple example, and Verilog ASM can become more complex depending on the specific requirements of your design.