IBIS Modeling(3)

The Origins of IBIS

• In 1991/2 PCI bus signal integrity simulations were ramping up at Intel, but no one had a PCI buffer designed yet
• SPICE models were very difficult to get in general
• We needed an easy way to do "what-if" analysis to come up with the PCI buffer specification
• Developed a behavioral buffer model in HSPICE to be able to simulate various buffer characteristics (strength, edge rate)
• The behavioral model was so successful that Intel decided to supply these to customers
  However, not all customers used HSPICE, so a tool independent model format was desirable
• Several EDA tool vendors showed interest in a common modeling format
  The IBIS open forum was formed and the first IBIS specification was written
  [From IBIS_class_2004_04_26.pdf, by Arpad, Muranyi, Intel]~