Flight time

This item analyzes and check the time it takes for the signal to pass from the driver to the receiver.

This item checks following:
  • The time it takes for the signal to pass from the driver to the receiver.
  • Two types of measurement standard - Pin to Pin, Die to Die.
  • Flight time is used interchangeably with propagation delay.
  • It used to limit the trace length considering losses.


Figure 1.
  • Item: Sub item name. User can enter arbitrary.
  • Net Group: Select target net group to be tested. Allow multiple net groups.
  • Except Component: Select the component to exclude from timing measurement, for example, a test point.
  • Frequency (MHz): Setup operating frequency.
  • Vth (Threshold Voltage): Voltage reference for measurement purpose.
    • When default voltage is selected, the following priority is used to determine the simulation model parameter.
      1. Vref (Vmeasure)
      2. (Vih + Vil)/2
      3. (Min/Max of waveform)/2
    • Use user defined voltage: Enter the threshold voltage directly from user.
  • Flight Time (ps): Enter allowable max Flight time.
  • Tolerance (%): Enter allowable tolerance of maximum Flight time.
  • Analyze Options Dialog: You can assign driver/receiver buffer simulation model, driving strength of driver and other simulation parameters.
    • Use pre-defined buffer model: The buffer model set in the electrical pin part of UPE is used as default. The user cannot change the buffer model here.
    • Use user defined buffer model: You can assign simulation buffer model.
  • Transient Analysis Parameters:
    • Analysis Type: Click the desired analysis type. Editable setting parameters will be shown.
    • Simulation time: End time of the SPICE transient analysis.
    • Signaling time: Input Signal having pulse period (2ns) will be excited to the net until the time assigned here.
  • Default Device Models: Use the default device model embedded in PollEx.
  • Measure Base:
    • Die to Die: Perform normal waveform analysis. Measure the time difference between the driver and the receiver waveform in the result.
    • Pin to Pin: Add probes to the driver/receiver pins in the topology and perform waveform analysis. Measure the time difference between the probes at the driver end and the probes at the receiver end in the result.