eldo_user

Eldo Premier
Enabling Eldo Premier
Enabling Eldo Premier
To activate Eldo Premier, use either of the following methods:
• Specify .OPTION PREMIER inside the netlist.
• Use the -premier command line argument when invoking Eldo.
Eldo Premier supports most of the same SPICE netlists and commands as Eldo Classic. Eldo
Premier is available for DC and transient simulations. When activated, the entire circuit is
simulated by the Eldo Premier kernel; nothing is solved by the Eldo Classic or ADiT kernels.
Some simulations (AC and noise for example) cause Eldo Classic to be activated (see
“Supported Commands” on page 74).
The command line flag, -use_proc, activates multi-threaded simulation on multi-core machines.
You can request a specific number of cores, half of those available, or all of them. The number
of cores is limited to 16.
The Eldo Premier simulator runs DC and transient analysis, including the save and restart
capabilities (frequency based analyses perform well in Eldo Classic).
Automatic Activation of Eldo Premier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Using Eldo Classic DC Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Handling Matrix-Like Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Solver Generation Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Automatic Activation of Eldo Premier
You can set Eldo (or Questa ADMS) to automatically choose the most appropriate and efficient
simulation kernel between Eldo Classic and Eldo Premier, based on the characteristics of the
netlist (number of nodes, number of devices, connectivity, commands).
To enable automatic Eldo Premier activation, use either of the following methods:
• Specify .OPTION AUTO[_SELECT] inside the netlist.
• Specify the -auto[_select] command line argument when invoking Eldo.
The weight of the following criteria is evaluated to decide which kernel to select automatically:
• Number of nodes
The more nodes the netlist contains, the more likely it is that Eldo Premier is selected. If
the netlist contains more than 1 million nodes, then Eldo Premier is always selected; if
the netlist contains less than 500 nodes, then Eldo Classic is always selected.
• Number of devices
64
Eldo® User's Manual, 15.3