@ inside always blocks

• Nested @ can halt execution

  • Says “wait for a trigger”
  • Can use for simple state machines
    • When next state doesn’t depend on input

always @(posedge clk) begin state = 4’b0001;

@(posedge clk)

state = 4’b0010;

@(posedge clk)

state = 4’b0100;

@(posedge clk)

state = 4’b1000;

end

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