178 - The voltage ranges in the IBIS model files typically extend beyond the limits specified in the device datasheets. Can these voltages be applied to the device?

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• 176 - In IBIS models, the drive high, or "[pullup]" section lists strange voltage ranges and appears to be inverted. Why is this?

  The IBIS specification uses voltages relative to ground for drive-low (pulldown), but voltages relative to the appropriate supply rail for drive-high (pullup). To convert to ground-relative voltages, take the nominal I/O supply voltage and subtract ...

• 729 - IBIS Model: How do I find the output resistance of an I/O?

  An IBIS Model is a mapping of voltage to current values for a given I/O standard, slew rate, and drive strength. User can estimate the output resistance by using a simple slope formula, in relative to the flow of current. Using Ohm's law: Resistance ...

• 1561 - LatticeECP3: Why are the LVDS input terminations modeled as resistors to 1.25v in the IBIS model file?

  The LatticeECP3 LVDS input terminations on die include a midpoint connection to the bank VTT pins on the device. This is why it is recommended in the LatticeECP3 data sheet to leave the bank VTT pins floating when using LVDS input terminations and to ...

• 432 - How to get IBIS model for differential LVPECL IO when the generated model from ispLEVER is a single ended model?

  The low voltage positive emitter couple logic (LVPECL) interface uses two separate single ended buffers, plus on-board resistors to emulate a differential pair. The input output buffer information standard (IBIS) requires that the models be ...

• 6144 - ECP5: Does the ECP5 IBIS model support Keysight's ADS tool?

  Yes, the device supports Keysight's ADS for the ECP5 IBIS model.