eldo_user

Post-Layout Simulation
Parameters Controlling the Reduction Process
or cut-off frequency for the reduction process. Default settings for these parameters usually
suitable for either analog or digital-like circuits may be selected using the optional
ANALOG=YES|NO parameter.
By default the Eldo generic .REDUCE command automatically activates a combination of
reduction methods expected to be well suited for the circuit being reduced according to its
topology. However, this automatic selection may induce some CPU and memory overhead, and
it is highly recommended that for large-sized backannotations, the type of (parasitic) network to
be reduced be specified using the REDUCE_NETWORK_TYPE option.
A third-party netlist reduction library, provided by EdXact SA (http://www.edxact.com), can be
selected with the optional ENGINE=JIVARO parameter. The integration of the netlist reduction
technology enables speeding up simulations with a large number of netlist parasitics, which are
mainly resistors and capacitors. The library is capable of reducing resistors, capacitors and
coupled capacitors. It has been derived from Jivaro , EdXact’s Model Order Reduction based
netlist reduction technology, using a subset of the available options and a dedicated direct
interface. The integration with Eldo is very tight, enabling a very easy integration for members
of CAD departments and a very simple usage for designers.
The Jivaro dynamic library and license to activate it is only provided by EdXact, and must be
purchased from EdXact; not from Mentor Graphics. If you are interested in using the Jivaro
reduction library with Eldo, please contact EdXact. Mentor Graphics does not ship the Jivaro
library, the license must be purchased solely from EdXact. There is no need for any additional
Mentor Graphics license to activate the library, only a license from EdXact is necessary.
Advanced Reduction
In addition to the .REDUCE [ANALOG=YES|NO] command, some specific reduction
commands for RLC or RC (.REDUCE TICER command), resistive-only reduction (.REDUCE
RONLY command) or coupling-capacitance reduction (.REDUCE CC command) are available.
Together with the available reduction options they provide full control of the reduction process.
See Also
• .REDUCE in the Eldo Reference Manual
• .REDUCE TICER in the Eldo Reference Manual
• .REDUCE RONLY in the Eldo Reference Manual
• .REDUCE CC in the Eldo Reference Manual
Parameters Controlling the Reduction Process
There are three main reduction parameters controlling the reduction methods activated by a
.REDUCE command, or more advanced specific reduction commands, described in the
dedicated sections of this chapter.
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Eldo® User's Manual, 15.3