eldo_user

IBIS Models Support in Eldo
IBIS Buffers
• inv_pin="inverting_pin_name"
Specifies a pin name within the specified component; this is to be used with the pseudo/true
differential buffers. Pin name and inverting pin name must match a differential pins pair
under [Diff Pin] IBIS keyword.
• component="component_name"
Specifies a component name within the specified IBIS file. The component name is casesensitive.
Component name must be specified if pin name or inverting pin name is specified,
while it is optional if you specify a model name.
• device="type_name|type_number"
Specifies the desired buffer type to be used; this is to check the buffer type assignment in the
IBIS instance against the buffer type given in the IBIS file. A list with buffer types and
numbers are given in Table 17-2.
• limit_k_factors=POWER|NO|YES
POWER
Prevent current flow in the power terminals, a_puref and a_pdref, from being nonmonotonic.
This is the default.
NO
Keep the scaling factors as calculated.
YES
Limit the switching scaling factors between 0 and 1.
Switching scaling factors are extracted from the rising/falling waveforms, and used to
modulate the output current of the buffer while switching.
o
o
Scaling factor 0 indicates fully off for the working network.
Scaling factor 1 indicates fully on.
Sometimes these factor values exceed one or become negative, causing a negative slope,
that may lead to some convergence problems.
Note
The POWER setting helps to avoid non-convergence issues whilst keeping the
correct buffer behavior on the a_signal terminal.
• corner=TYP|MIN|MAX|FAST|SLOW
Specifies the IBIS corner to be used to extract the data from the IBIS file. The default is
corner=TYP—if any data is missing under the Min or Max columns in the IBIS file then
the Typ column value will be used instead. When corner=TYP, MIN, or MAX, simulation
will extract the data under the corresponding Typ, Min, and Max columns in the IBIS file.
When corner=FAST or SLOW, corner uses combinations from data under the Min and
Max columns; FAST is the same as MAX, and SLOW is the same as MIN except for
parameters listed in Table 17-5.
Eldo® User's Manual, 15.3 755