title: How to make startup process in VHDL
body: <p>How to make a process that executes only once on powering up?<br>
  It is easy to make a process that executes when reset button is pressed, but how to make it run when you plug in the power supply without touching the reset button?<br>
  In my example I want to initialize the LCD on startup and I need to send some commands to it in the beginning, but I don't need it in the process that is dependent on some signal like reset(just let's suppose there is no reset button at all).</p>