eldo_user

IBIS Models Support in Eldo
IBIS Buffers
The default behavior is to use the first two waveforms if more than one waveform is
specified in the IBIS model, use one waveform if only one is specified, and to use ramp if no
waveforms are specified.
• k_pulldown="node", k_pullup="node"
The purpose of these keywords is to display the values of the pull-up and pull-down
coefficients of the device as a function of time as the device goes through rising or falling
transitions.
• msel_mode=value
The value indicates a model order under the [Model Selector] keyword in the IBIS file. If
the value given is greater than the model selector list, then the first model will be selected.
The default is 1.
• model_selector='mod_sel1=mod_name1 [, mod_sel2=mod_name2 ,...]'
Used to select models for some or all model selectors in the given IBIS file. model_selector
has a higher precedence over msel_mode.
• package=0|1|2|3|OFF|CMPNT|PIN|PKGMOD
Specifies the package modeling type to be used for package parasitics.
0 or OFF
No package is added.
1 or CMPNT
RLC components defined under [Package] keyword are added, this is the default
when specifying model name.
2 or PIN
RLC components defined under [Pin] are added, this is the default when specifying
pin name.
3 or PKGMOD
A package model will be used. This is the default.
Note
For a single buffer and package=PKGMOD; if the package model is defined in
matrix form Eldo issues a warning and sets package=PIN.
If no data is available for the selected packaging type, then the data in the lower type
will be used.
• ss_state=ON|OFF
For Series Switch buffers, if ss_state=ON, then Eldo will use the data under the [On]
keyword: setting it to OFF, the data under [Off] keyword will be used. The default is ON.
Eldo® User's Manual, 15.3 757