title: Need help in modelling a delay element in Simulink
body: <p>I need to generate a pulse which steps from 0 to 1 after an initial predetermined time has elapsed. When the new predetermined time is available, the pulse should again step from 1 to 0. It should step from 0 to 1 after that time has elapsed. This model has to be implemented in Simulink.</p>
  
  <p>Thanks.</p>