Default value for a wire port. Describes a driven clock port. Indicates the name of the cllock. If not specified the name is assumed to be the name of the containing port. Describes a driven one-shot port. Time in nanoseconds until start of one-shot. Value of port after first edge of one-shot. Duration in nanoseconds of the one shot. Specifies if a port requires a driver. Default is false. The attribute driverType can further qualify what type of driver is required. Undefined behaviour if direction is not input or inout. Driver type any indicates that any unspecified type of driver must be connected Defines the type of driver that is required. The default is any type of driver. The 2 other options are a clock type driver or a singleshot type driver. Wire port driver type. Wire port driver element. Clock period in units defined by the units attribute. Default is nanoseconds. Time until first pulse. Units are defined by the units attribute. Default is nanoseconds. Value of port after first clock edge. Duration of first state in cycle. Units are defined by the units attribute. Default is nanoseconds. Describes a clock not directly associated with an input port. The clockSource attribute can be used on these clocks to indicate the actual clock source (e.g. an output port of a clock generator cell). Indicates the name of the clock. Indicates the name of the actual clock source (e.g. an output pin of a clock generator cell).