eldo_user

Eldo Control Language
Testbench Instantiation
This measure_tprop example testbench is only partially parameterized. To be usable, the node
gnd must exist, and the circuit must have a D input and a VDD power supply. Otherwise all of
these elements would be dangling, or creating an error at simulation time. It is up to the designer
to parameterize any piece of the testbench that may potentially vary; nothing is imposed.
Here is another example, which is self-explanatory:
.define_testbench transient (vpulse=1)
.connect out inn ! follower connection
vinp inp 0 DC 0 PULSE 0 vpulse 0n 1n 1n 10n 20n
.tran 1n 50n
.extract tran label=overshoot max(V(out))-vpulse
.end_define_testbench
Related Topics
Testbench Instantiation
Rules for Testbench Location Resolution
Testbench Instantiation
A testbench definition will have no impact on the simulation of the netlist if the testbench is not
instantiated. It only creates a user-defined macro that can be reused elsewhere.
The testbench name must be prefixed with a “.” if it is instantiated directly in the netlist (but not
if it is used for a simulation inside a task). Testbench parameters may be given specific values
during instantiation; if not, their default value will be used.
Examples of instantiations of the testbenches defined above:
.tran_options
.measure_tprop trise=1n cload_val=2p
.transient
Note
The Eldo Control Language is case-sensitive; in the example above, trying to instantiate
.measure_tprop Trise=1n Cload_Val=2p will generate an error.
Give special consideration when choosing the names of testbench parameters. The substitution
of the occurrences of a testbench parameter name with its instantiation value is really text
replacement, everywhere a token matches the parameter name in the testbench definition. For
example, in the measure_tprop example above, it would have been wrong to call the cload_val
parameter cload because the name of the capacitor on the second line is also cload. If cload_val
had been called cload, instantiating the testbench would have included the line 1p out gnd 1p
but not cload out gnd 1p.
Eldo® User's Manual, 15.3 811