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IBIS Models Support in Eldo
IBIS Support in Eldo
IBIS Support in Eldo
Eldo uses the latest IBIS parser to support IBIS files up to and including IBIS version 5.0.
Eldo can simulate IBIS devices either individually or in the overall component. See “Supported
Keywords and Sub-Parameters” on page 780 for further information.
Backward Compatibility
Beginning the AMS2010.1 release, an improved algorithm is available for over-clocking
switching and uses default values for IBIS instance keywords, c_fixture=yes and
keep_monotonic=no, which provides results with better matching to transistor level results.
For backward compatibility use the Eldo option or IBIS instance keyword IEVER, which may
be used to switch back to older Eldo IBIS behavior as follows:
• IEVER=1
Switch back to the behavior prior to AMS2007.2. In this implementation most IBIS v2.1
features are supported, but it uses different algorithms and components than the current
implementation.
• IEVER=2
Switch back to the behavior prior to, and including, AMS2009.2. This implementation is
the same as the current one, but an alternate algorithm is used for over-clocking
switching, with default values c_fixture=no and keep_monotonic=yes.
Note
The backward compatibility option IEVER does not affect the parser version used. In all
cases the latest parser version is used to parse IBIS files.
Analysis Types
IBIS specifications provide data about the large signal behavior of the I/O buffers and their
switching characteristics. However, no data about the frequency domain behavior is provided.
Therefore, IBIS simulation can be performed in either the DC or Transient domain.
IBIS simulation is supported in Eldo using:
• DC analysis
• Transient analysis
Eldo® User's Manual, 15.3 749