eldo_user

Specifying Simulation Output
Extraction Mode
The functions listed below can be used in DC and are useful to check design settings:
• EVAL
• MAXGMVT
• MODPAR
• OPMODE
• POW and POWER
• PVAL
Related Topics
Tip
See “.EXTRACT” in the Eldo Reference Manual.
Extracting Information
Extract Examples
Extraction Mode
To activate extraction mode, to perform measurements using waves stored in .wdb files, run
Eldo with the -extract argument. Eldo only performs the .EXTRACT and .MEAS commands,
without performing the simulations. Eldo will decorrelate the simulation from the extraction.
The extractions in the netlist will be solved using the corresponding waves contained in the
specified file. This functionality can also be specified with the netlist command .EXTMOD.
Multiple levels of extraction (a combination of .STEP, .ALTER, .DC SWEEP, and so on) are
not supported with the extraction mode.
The extraction mode is driven by the input waveform file. This means:
• The SPICE input file can contain .EXTRACT/.MEAS commands only, to reduce the
parsing time for large designs.
• All multiple-run commands specified in the netlist are ignored: .STEP, .MC, .TEMP,
.ALTER, and so on.
• Eldo loads the data from the input file, one analysis after another.
• The main purpose of the extract mode is to calculate extracts as fast as possible,
therefore Eldo does not save them in a new .wdb file by default; specify option
EXTMOD_GENWAVE to enable the saving.
• Eldo loads varying parameters (if available) from the input file and recreates a .STEPlike
structure. SWEEP extracts are not replayed because Eldo does not know how the
.STEP commands were ordered.
Eldo® User's Manual, 15.3 327