Pin Properties Dialog Box

You open this dialog box by right-clicking a pin in a Block Design File (.bdf) Definition and then clicking Properties.

Allows you to specify properties for the selected pin.

General tab

Pin Name(s)— Allows you to specify the pin name.
Default value— Allows you to set the default value of the pin to VCC or GND.

Default values are used when the port is not driven by a node or entity. That is, when an input port is not driven, the underlying input pin will drive all its fan-outs with the default value on the pin.

For example, when a port is not driven, it means that a pin X exists in an entity foo, and the entity foo is instantiated in another design module. However, the port X on the instantiation of foo does not have a signal feeding it in the design. Therefore, the port X is considered unused and the default value of pin X is used to drive the fanouts of pin X.

Default pin values are used only for lower-level pins. Top-level pins that are usually converted to I/O cells do not have these default pin values.

Format tab