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Chapter D Attribute List

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PKGTYPE The physical carrier type to be used for the part. (Examples:

DIP14, LCC20, DIP8). If the package definition for the part has

only one available package type defined, then the

PKGTYPE

attribute will be assigned this value. You can manually assign

the package type by editing or creating this attribute, or you

may have the

PKGTYPE attribute assigned during packaging.

REFDES The Reference Designator of a part. The value of the

REFDES

attribute is a combination of the Package Reference Designator

(

PKGREF) and the gate (GATE) attributes. For example, if your

PKGREF is U1 and your GATE is A, then your REFDES will be U1A

(and will appear as such on your schematic).The

REFDES cannot

be edited directly in the schematic editor. You must edit the

PKGREF or the GATE, or both attributes instead. When you

double-click the

REFDES of a part within the schematic editor, the

dialog that appears has two edit controls: one for the Package

Reference Designator and one for the Gate.

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The

REFDES of a part is defined in the symbol editor. The default

REFDES is U?. In the schematic editor, the ‘?’ portion of the REFDES

is replaced by a number when the part is placed on the

schematic, or when you select Annotate from the Tools menu.

The number assigned gives each part instance a unique

reference designator within a level of hierarchy.

SIMULATION-

ONLY

If present, this attribute indicates that the part only has meaning

for simulation. There will be a netlist entry for parts with this

attribute, but no layout netlist entry. The

SIMULATIONONLY

attribute identifies parts such as voltage and current sources,

breakout devices (found in breakout.slb) and special symbols

(found in special.slb).

Table 1 Reserved Attributes (continued)

Attribute Description See Notes