User`s guide

Understanding the IBIS Model
i.MX53 System Development User’s Guide, Rev. 1
3-4 Freescale Semiconductor
3.4 Model Information
The [Model Selector] keyword provides a simple means by which several buffers can be made optionally
available for simulation at the same physical pin of the component, as shown in Example 3-3.
Example 3-3. Model Selector Keyword Example
[Pin] signal_name model_name R_pin L_pin C_pin
AA4 JTAG_TDI gpio 0.307112 5.51128nH 0.40126pF
…
[Model Selector] gpio
gpio_iods0hvf GPIO, 2.7V, Low Drive, Fast SR
gpio_iods0hvs GPIO, 2.7V, Low Drive, Slow SR
……
The [Model] keyword starts the description of the data for a particular buffer. While a buffer model can
appear quite complex, most buffers can be described using the following parameters and keywords:
• Parameters section
• Reference information
• IV keywords (see Figure 3-1)
• Vt keywords
Figure 3-1. Model IV Keywords’ Structure