Generating IBIS Models‌ - 2023.2 English

Vivado Design Suite User Guide: I/O and Clock Planning (UG899)

Document ID
UG899
Release Date
2023-10-18
Version
2023.2 English

The Input/Output Buffer Information Specification (IBIS) is a device modeling standard. IBIS allows for the development of behavioral models used to describe the signal behavior of device interconnects. These models preserve proprietary circuit information, unlike structural models such as those generated from Simulation Program with Integrated Circuit Emphasis (SPICE) simulations. IBIS buffer models are based on V/I curve data produced either by measurement or by circuit simulation.

IBIS models are constructed for each IOB standard, and an IBIS file is a collection of IBIS models for all I/O standards in the device. An IBIS file also contains a list of the used pins on a device that are bonded to IOBs configured to support a particular I/O standard that associates the pins with a particular IBIS buffer model.

The IBIS standard specifies the format of the output information file that contains a file header section and a component description section. The Golden Parser was developed by the IBIS Open Forum Group (www.ibis.org) to validate the resulting IBIS model file by verifying that the syntax conforms to the IBIS data format.

When you export an IBIS model in the AMD Vivado™ IDE, the tool outputs a .ibs file. This file comprises a list of pins used by your design, the signals internal to the device that connect to those pins, and the IBIS buffer models for the IOBs connected to the pins.