This module is a way for controlling the different modules by going through three different states - 2'b00 for getting the password, 2'b01 for attempting to unlock the lock, and 2'b10 for verification of the entered password. you will pass the strobe from the scankey module as the clk, the corresponding reset, the comparative expression "keycode =5b1" as the enable (since it implies that pb[16] or w is being pressed) and connect the output state to left [1: 0]. toggling w should cause the state machine to go from 0 to 1, and another toggle should make it go from 1 to 2, where further toggling of w will not cause any more changes. instantiate this module as follows: wire [1: 0] state; dcl_controller dcl1 (.clk(strobe), .reset(reset), .enable(keycode = 5'b1), .state (state); assign right[1: 0] = state;