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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Support for External Models and Interfaces >
IBIS Library Support >
IBIS File Support

IBIS File Support

Designer can parse IBIS^® input files, but not all features of the IBIS specification are supported. Some IBIS buffers are available as built-in Nexxim components.

Designer IBIS Support

Designer supports the following features of the IBIS specification:

• Import IBIS library files (.ibs); see IBIS Library Import Procedure.

• Import IBIS Electrical Board Description files (.ebd); see Importing IBIS EBD Files.

• Convert models for single-ended (not differential) driver and receiver pins to SPICE circuits.

• Extract IV curves from the following and translate into equivalent piece-wise linear devices for SPICE: Pull-up, Pull-down, power and ground clamp devices.

• Extract rise/fall-time information from the IBIS file in order to sequence the pull-up/down devices.

• Read in pin parasitics (RLC elements) and incorporate into models.

• Electrical board description (EBD) files.

The following features of the IBIS specification are not supported:

• Series switch groups

• Submodels of type Bus_hold and Fall_back. Dynamic_clamp IS supported.

• Power/ground pulse tables

• Package models (.pkg files)

• Programmable logic buffers.
These are buffers with different user-selectable driver strengths (corresponding to different IV curve models). IBIS models that currently use this feature will not import correctly, but are available as Nexxim built-in elements.

Nexxim IBIS Support

The Nexxim simulator offers the following IBIS buffers as built-in components:

• Input

• Output

• Tristate

• Input/Output

• Open Drain, Open Sink, Open Source

• I/O Open Drain, I/O Open Sink, I/O Open Source

• Input ECL

• Output ECL

• Tristate ECL

• Input/Output ECL