remove_net - 2023.2 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

Document ID

UG835

Release Date

2023-10-18

Version

2023.2 English

Remove nets from the current design

Syntax

remove_net [‑prune] [‑quiet] [‑verbose] <nets>...

Usage

Name	Description
`[-prune]`	When performing net removal, remove pins and ports which are left unconnected as a result of the remove_net operation.
`[-quiet]`	Ignore command errors
`[-verbose]`	Suspend message limits during command execution
`<nets>`	List of nets to remove

Description

Remove the specified net from the netlist of an open Synthesized or Implemented Design.

Note: You cannot remove nets from library macros, also called macro-primitives.

To remove a bus, you must specify the primary bus name, and not specify a bus index. This ensures that the entire bus is removed, and not just a portion of the bits associated with the bus. You can resize a bus, eliminating bits of the bus, using the resize_net_bus command.

Netlist editing changes the in-memory view of the netlist in the current design. It does not change the files in the source fileset, or change the persistent design on the disk. Changes made to the netlist may be saved to a design checkpoint using the write_checkpoint command, or may be exported to a netlist file such as Verilog, VHDL, or EDIF, using the appropriate write_* command.

Note: Netlist editing is not allowed on the elaborated RTL design.

Arguments

-prune - (Optional) Prune, or remove, any unconnected hierarchical pins, ports, or nets, as a result of removing the specified net.

-quiet - (Optional) Execute the command quietly, returning no messages from the command. The command also returns TCL_OK regardless of any errors encountered during execution.

Note: Any errors encountered on the command-line, while launching the command, will be returned. Only errors occurring inside the command will be trapped.

-verbose - (Optional) Temporarily override any message limits and return all messages from this command.

Note: Message limits can be defined with the set_msg_config command.

<nets> - (Required) The list of nets to remove from the netlist of the current design.

Example

Using the following connection network:

leaf_cell1/pin1 > net1 > block1/pin1 >
   topnet
< block2/pin1 < net2 < leaf_cell2/pin1

This example will remove block1/pin1, block2/pin1, net1, and net2, but will not prune the pins on the leaf cells:

remove_net topnet -prune

The following example illustrates the warning returned when trying to remove one bit of a bus net, and then removes the entire bus by specifying the root name:

remove_net DataIn_pad_1_i[0]
WARNING: [Coretcl-82] No nets matched 'DataIn_pad_1_i[0]'.
remove_net DataIn_pad_1_i