eldo_user

Eldo Control Language
Testbench Instantiation
Testbenches may be nested, or more precisely, it is possible to instantiate a testbench inside
another testbench. It is not permitted for a testbench to instantiate itself.
Limitation: SPICE parameters can be used to set values to testbench parameters when
instantiating a testbench in the netlist if they are declared before the testbench instantiation. For
example:
.param p1 = 1
Example
.tb_1(param1=p1)
.define_testbench tran_setup (duration=1n)
.option eps=1e-8 hmax=10p reltol=1e-7 gear
.tran 0 duration
.end_define_testbench
.define_testbench measure_tprop
+ (cload_val=1p, trise=10n, signal="out")
.tran_setup duration=100n
cload signal gnd cload_val
VD D gnd PULSE 0V 1.8V 0n trise trise 50n 100n
.extract tran label=tp xup(V(signal),1.8/2)-xup(V(D),1.8/2)
.extract tran label=avgivdd average(i(vdd))
.end_define_testbench
In the example above, the tran_setup testbench is instantiated inside the measure_tprop
testbench.
Note
It is not permitted to define a “local” testbench inside another testbench.
A special testbench is automatically defined during elaboration. It consists of the part of the
netlist that contains no task definition or testbench, and it is included by default in any
simulation run from a task.
Related Topics
Defining and Running Simulations
Rules for Testbench Location Resolution
812
Eldo® User's Manual, 15.3