Terminal Attributes

A terminal allows a net to be connected to another net at the next level up in the hierarchy.

Attribute	Modify	Type	Description
include Generic Object Attributes.
assocTextDisplays	no	l_objId	List of text displays with this terminal object as their associate
connRoutes	no	l_objId	A list of all routes that connected to the terminal.
direction	yes	string	`"input"`input terminal
			`"inputOutput"`both input and output terminal
			`"jumper"`jumper terminal
			`"output"`output terminal
			`"switch"`terminal is a switch
			`"unused"`terminal is not used
groupMembers	no	l_objId	List of all group members for this terminal.
isInterface	no	boolean	Indicates whether this terminal is an interface terminal. See isInterface Attribute.
markers	no	l_objId	List of all markers for this terminal
mustJoinTerms	no	l_objId	Indicates that terminals on different nets must be connected. See Soft Connect Terminal Functions for a description of pin modeling. Value values are `nil` (not a mustJoinTerm) or a list of mustJoin terminals in that mustJoin group.
name	yes	string	Name of this terminal.
net	no	objId	Net associated with this terminal.
numBits	no	integer	Width of this terminal in bits.
objType	no	string	Type of object, in this case “term”.
pinCount	no	integer	Number of pins connected to the terminal.
pinConnectedMethod	yes	string	Sets and gets the pin connection method for this terminal.
physOnly	no	boolean	When `t`, the terminal is physical rather than physical and logical. When a cellview is written from SoCE, the cellview contains EMH data and is physical and logical. Terminals inherit this `physOnly` status from the cellview.
pins	no	l_objId	List of all pins on the terminal.
routeMethod	yes	string	Describes the route method. `"geometric" "symbolic"`
textDisplays	no	l_objId	List of text displays owned by the terminal object.

isInterface Attribute

isInterface is a flag on a terminal in a design that specifies whether this terminal is part of the original interface specification of the design. Its value is independent of whether the terminal is implicit or explicit. It is primarily used by the oa2verilog translators and by the OpenAcess interface into Innovus.

Let’s consider a schematic pin A<0:1> in Layout XL.

The Generate All From Source or Update Components And Nets command creates two explicit layout terminals A<0> and A<1>. Additionally, when the createImplicitBusTerminals option is enabled (default value), Layout XL creates an implicit bus terminal A<0:1>. Being implicit, this bus terminal does not show up in the Navigator or the cv~>terminals SKILL API.

Layout XL also sets the isInterface flag of the implicit bus terminal A<0:1> to true and the isInterface flag of the explicit bit terminals A<0> and A<1> to false. This maintains the information of the original schematic design, where the A<0:1> terminal was the interface and the bit terminals were no-interface.

If the createImplicitBusTerminals option is disabled, layout only has the A<0> and A<1> explicit terminals and the isInterface flag on both the terminals is set to true.

Virtuoso Studio Design Environment SKILL Reference
Product Version IC23.1, November 2023