When using Virtex-II SPICE models, how do I account for worst, typical, and best cases in my simulation?
Xilinx SPICE models are available for download at:
(Please note that you must to register and request access to this area, and that it may take up to two business days for your access to be granted.)
I/O performance is affected by three distinct parameters: process, voltage, and temperature.
Each I/O standard has a stimulus (.sp) file associated with it. The name of this file reflects the I/O standard (e.g., lvcmos_15_2_fast = LVCMOS, 1.5V, 2mA drive strength, fast slew rate). Within this file, voltage and temperature can be directly manipulated by the user.
You may account for the best/typical/worst-case process by changing the models directory to which the stimulus file refers:
.options search='../models/modtt' (This points to the typical models.)