eldo_user

Specifying Simulation Output
Plotting Safe Operating Area Limits
Note
There is a shift between the x values printed in the .chi file (or saved SOA file) and the .wdb
output because in the .chi file they are interpolated, but in the .wdb the events/data points are
synchronized with time steps.
Modifying the SOA Identifier Format
It may be difficult to identify the .SETSOA command in EZwave using the default naming
convention for SOA identifiers, option SOA_WAVE_FORMAT="value" can be used to control
the format of the identifier. The value of the option is a string, composed of several predefined
tokens identifying an element of a .SETSOA command:
• %label provides the LABEL specification of the .SETSOA.
• %code provides the SOACODE specification of the .SETSOA.
• %file provides the filename where the .SETSOA command is defined.
• %line provides the line in the file where the .SETSOA command is defined.
The complete waveform name is built using the instance/device name together with a VHDL
extended syntax suffix. For example, with the following:
.option SOA_WAVE_FORMAT="%code%file%line%label"
.setsoa tran SOACODE=1011 LABEL=foo ...
EZwave displays: SOA(XM7.M1\code:1011\\file:test.cir\\:line:12\\label:foo\)
A token may be specified more than once. For the following example:
.option SOA_WAVE_FORMAT="%code%code"
.setsoa tran SOACODE=1011 LABEL=foo ...
EZwave displays: SOA(XM7.M1\code:1011\\code:1011\)
TSMC SOA Support in Eldo
Eldo supports the TSMC Safe Operating Area check functionality. Parameters are provided in
the .MODEL statements for MOSFET, BJT, and Diode devices, and in both .MODEL
statements and instances for Resistor and Capacitor devices. The .CHECKSOA command
enables the TSMC SOA checks, unless option SWARN=0 is set. Alternatively, if there is no
.CHECKSOA option but option SWARN=1, then only the TSMC SOA are checked, not the
.SETSOA statements. (See option “SWARN” in the Eldo Reference Manual.)
Eldo supports TSMC SOA versions v0.4 and v0.5. TSMC SOA is different to the TMI SOA,
which is the SOA of the TSMC Modeling Interface (TMI). For further information, refer to the
TSMC SOA specification document.
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Eldo® User's Manual, 15.3