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From a manufacturer's point of view, releasing a PSICE model of their component has some risks. Competitors may be able to work out confidential circuit implementations from the netlist. IBIS, or the "Input/Output Buffer Information Specification," is a device modeling standard that was developed in 1993 by a consortium of companies from within the electronic design industry. IBIS allows the development of device models that preserve the proprietary nature of IC chip designs, while at the same time providing information-rich models for signal integrity and EMC analysis.
IBIS models do not model the functionality of the device as SPICE models do. They simply model how the inputs and outputs switch, their inductance, capacitance, and voltage and current characteristics. However, this has the advantage that models can be created for devices that it would be completely impractical to develop a SPICE model for - for example, the AMD K6 microprocessor!
Although IBIS models will not work directly in a SPICE simulation, there is a tool available for translating IBIS models into SPICE models.
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