eldo_user

Setting Up An Analysis
Saving and Restarting Transient Simulations
.RESTART test.sav file=test_previous.wdb
A new wdb file is created, restart.wdb, which is the concatenation of the previous results
and the current simulation results file.
In this example, Eldo will create the file restart.wdb as usual, but will first copy
test_previous.wdb into restart.wdb before adding new points in the restart.wdb file. To permit
the concatenation of the previous binary output file with the new binary output file, you have to
rename it.
If the file=test_previous.wdb string is omitted from the .RESTART command, then the first
point in the restart.wdb file will correspond to the time at which simulation actually restarts.
Save and Use Example
1. Run a simulation containing the following command to save DC analysis results to file
test.ddt:
.SAVE test.ddt dc
2. Relaunch Eldo with the following command in the netlist
.USE test.ddt ic
This specifies DC operating point values in test.ddt should be read as .IC values
Aborting Simulation and Saving Current State
If a transient simulation run is interrupted by the user with a Control-C, Eldo prompts the user,
inquiring if the simulation status should be saved. If the user answers in the affirmative, the
simulation data is saved in a file named .sav where cirname is the name of the circuit
description file with no extension.
To restart the simulation from this interrupted point, the circuit description file should be
modified to include the command:
.RESTART
The simulation will then be restarted automatically from the time it was interrupted. The .TRAN
command needs to be updated. Options and/or stimuli might be changed as well.
Related Commands
• .SAVE in the Eldo Reference Manual
• .USE in the Eldo Reference Manual
• .LOAD in the Eldo Reference Manual
• .RESTART in the Eldo Reference Manual
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Eldo® User's Manual, 15.3