eldo_user

Scalar Design Objectives
Optimization
Specifying Design Objectives Using .EXTRACT
The general syntax of the .EXTRACT command for scalar objectives is:
Syntax
.EXTRACT
+ [EXTRACT_INFO] [LABEL=NAME] [FILE=FILE_NAME]
+ [VECT] [CATVECT] $MACRO|FUNCTION
+ [OPTIMIZER_INFO]
Parameters
• [EXTRACT_INFO] [LABEL=NAME] [FILE=FILE_NAME] [VECT] [CATVECT]
$MACRO|FUNCTION
Refer to .EXTRACT in the Eldo Reference Manual for more information.
• OPTIMIZER_INFO:=
GOAL=MINIMIZE|MAXIMIZE [WEIGHT=RVALUE]
| GOAL=RVALUE [WEIGHT=RVALUE]
| GOAL=OPMODE_VALUE
| EQUAL=RVALUE
| {LBOUND=RVALUE | UBOUND=RVALUE}
| LBOUND=RVALUE UBOUND=RVALUE
The OPTIMIZER_INFO parameter describes the optimization. It is ignored if the
.OPTIMIZE command is not specified in the netlist.
A MINIMIZE or MAXIMIZE objective specifies that the extracted measure is to be
minimized or maximized.
The optional WEIGHT parameter is a positive value attached to the design objective and
weights objectives with respect to their relative importance.
The parameter GOAL=RVALUE defines a soft constraint on the measure. The default value
is 0. This does not apply to the passfail method.
The parameter GOAL=OPMODE_VALUE defines a set of hard constraints on the
operating mode of a given device. This “goal” must be specified when the extract function is
defined as OPMODE(DEVICE_NAME).
The LBOUND, UBOUND and EQUAL parameters define hard constraints on the measure.
Note
The additional parameters (GOAL, EQUAL, LBOUND, UBOUND and WEIGHT)
have no effect when the .OPTIMIZE command is not specified in the netlist. The
specification of at least one of the parameters GOAL, EQUAL, LBOUND and/or
UBOUND is mandatory for optimization.
Related Topics
Vector Design Objectives
Eldo® User's Manual, 15.3 605