create_group

create_group 
{-set d_setObj | -net {s_netName…}} 
[-name s_groupName] 
[-type {net_pair | net_bundle | net_match | net_symmetry | group 
| cross_talk | net_strand | global_bundle}]

Description

Creates an object group.

Arguments

`-name` s_groupName
	Specifies the name for the object group. If this argument is not given, the object group is assigned a name whose prefix identifies the group type, followed by an integer value. For example, for unnamed `net_match` groups, the first group is named `netMatch0`, the second is named `netMatch1`, and so on. The group type/default name prefix pairs are listed below:
	`cross_talk`	`crossTalk`
	`global_bundle`	`globalBundle`
	`group`	`group`
	`net_bundle`	`netBundle`
	`net_match`	`netMatch`
	`net_pair`	`netPair`
	`net_strand`	`netStrand`
	`net_symmetry`	`netSymmetry`
`-net` {s_netName…}
	Assigns nets in the list to the group.
`-set` d_setObj
	Assigns the nets in the set to the group.
`-type` s_groupType
	Specifies the type of group to create. Some Space-based Router and Chip Optimizer features operate on groups of a specific type.
	`cross_talk`	Creates a group of nets. Net groups are used by assign_group_group for group-level constraints. For `cross_talk`, neighbor nets are classified as good neighbors, bad neighbors, or neutral for routing purposes by setting the `crosstalkNeighborIndex` constraint.
	`global_bundle`	Creates a group of nets that the global router (global_route) will attempt to route together in common channels.
	`group`	Creates a group of nets. Net groups are used by assign_group_group for group-level constraints. This is primarily used to specify a minimum spacing between two groups of nets.
	`net_bundle`	Creates a net bundle for bus routing (bus_route).
	`net_match`	Creates a group of nets for matching lengths (fix_length).
	`net_pair`	Creates a net pair for pair routing (Preparing for Pair Routing)
	`net_strand`	Identifies nets for strand routing.
	`net_symmetry`	Creates a net pair for symmetry routing.

Examples

Creates two net groups which can be used by assign_group_group to set group-level constraints, such as minimum spacing, between the two groups of nets.

create_group -set $signalNets -name signal_nets -type group
create_group -set $powerNets -name power_nets -type group

Creates a group of selected nets. During global route, these nets will be routed together in common channels.

create_group -name bundlegroup -type global_bundle -set [get_selection_set]global_route

Virtuoso Space-based Router Constraint Reference
Product Version IC23.1, June 2023

create_group

Description

Arguments

Examples

Related Topics

Virtuoso Space-based Router Constraint ReferenceProduct Version IC23.1, June 2023

create_group

Description

Arguments

Examples

Related Topics

Virtuoso Space-based Router Constraint Reference
Product Version IC23.1, June 2023