.if and .else

.if (condition_1)
 Statements
.elseif (condition_2)
 Statements
.else
 Statements
.endif

Description

Specifies the different conditions that determine the components that are instantiated by the Spectre FX simulator for a given simulation. The determining conditions are computed from the values of parameter expressions. You can specify these conditions with the structural .if/.else statement. These statements can be embedded.

Arguments

Name	Description
condition	Boolean-valued expressions where a non-zero value is considered as true.
statements	Contains one or more instance statements or .if statements. The .else or .elseif part of the statement is optional.

Example

The following example illustrates the use of the .if statement. There are additional .if statements in the statement1 and statement2 fields.

.param cvalue=1p 

.if (rseries == 0)

c1 a b cvalue

.if (gparallel != 0) 

rgp1 a b '1/gparallel'

.endif

.else  

r2 a x rseries 

c2 x b cvalue

.if (gparallel != 0) 

rgp2 x b '1/gparallel'

.endif

.endif

In the above example, the Spectre FX simulator adds different instance statements into the simulation depending on the values of the parameters, rseries and gparallel.

• If both rseries and gparallel are zero, the simulator includes the instance statement for capacitor c1. If rseries is zero and gparallel is a non-zero value, the simulator includes the instance statements for capacitor c1 and resistor rgp1.
• If rseries is non-zero and gparallel is zero, the simulator includes the instance statements for resistor r2 and capacitor c2.
• If neither rseries nor gparallel is zero, the simulator includes the instance statements for resistor r2, capacitor c2, and resistor rgp2.

Related Topics

Conditional Instances

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