eldo_user

Simulator Compatibility
Compat Mode Flexibility
In this example, two analyses would be performed in standard compat mode, but if the
commands were inside a .COMPAT/.ENDCOMPAT block only one transient analysis
of 20n would be performed.
• Hybrid compat mode, with .COMPAT/.ENDCOMPAT blocks, impacts only model/
device parameters, not the way analyses are performed.
• In hybrid compat mode, the default temperature of devices inside .COMPAT/
.ENDCOMPAT blocks is 27°C, the same as the Eldo default mode. This temperature is
applied across the entire design. In compat mode, the default temperature is 25°C.
Tip
See “.COMPAT” in the Eldo Reference Manual.
Compat Mode Flexibility
Instead of using -compat (or .OPTION COMPAT) to read an HSPICE netlist, the -compmod
and -compnet arguments (or .OPTION COMPMOD and .OPTION COMPNET) can be set.
The effects of these arguments are:
• -compat — Interprets the netlist and the models as HSPICE format.
• -compmod — Triggers only the automatic conversion of models, not the netlist syntax.
Can alternatively be set with .OPTION COMPMOD. Only models referenced in the
topic “Devices in Compat Mode” on page 165 will be converted.
Note
-compmod only effects the model selection, not the parameters of a library. If you
have a HSPICE library that you want to be fully handled as such you should enclose
the .LIB command with .COMPAT and .ENDCOMPAT commands for “Hybrid
Compat Mode” on page 162. A library which contains no model, but only a subcircuit
with parameters will not be converted. -compnet must be used instead of -compmod in
this particular case.
• -compnet — Causes the netlist to be interpreted as compatible format, but the device
models are handled as Eldo SPICE models. This assumes the models are selected with
the Eldo model levels (for example, to select the BSIM3v3 model you must specify level
53, not 49). -compnet can alternatively be set with .OPTION COMPNET.
The -compnet and -compmod arguments apply to the entire netlist, including library files. For
example, when -compnet is set, even the statements in the library file, including those of model
library files, are interpreted in compat mode.
164
Eldo® User's Manual, 15.3