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AR# 15365

IBIS/SPICE Models - How do these models account for the speed grade of a device?

Description

General Description:

How do Xilinx IBIS and SPICE models take the speed grade of a device into account?

Solution

Speed grades have no impact on IBIS and SPICE models. Because I/O transistors are considerably larger than core transistors, I/O switching speed is not considered when a device is labeled with a particular speed grade. Instead, both IBIS and SPICE models offer Min, Typical, and Max models in order to account for process, voltage, and temperature variation.

AR# 15365
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article