connect_debug_port - 2022.1 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

Document ID
Release Date
2022.1 English

Connect nets and pins to debug port channels


connect_debug_port [‑channel_start_index <arg>] [‑quiet] [‑verbose] <port>


Name Description
[-channel_start_index] Connect nets starting at channel index
[-quiet] Ignore command errors
[-verbose] Suspend message limits during command execution
<port> Debug port name
<nets> List of nets or pins


Debug, XDC


Connects a signal from the netlist design to a port on an ILA debug core that was added to the design using the create_debug_core command. The signal can either be connected to a specific channel index on the port, or simply connected to an available channel on the port.

If you try to connect too many signals to a port, or there are not enough channels to support the connection, the tool will return an error.

Additional ports can be added to a debug core through the use of the create_debug_port command, and you can increase the available channels on an existing port with the set_property port_width command. See the examples below.

You can disconnect signals from ports using the disconnect_debug_port command.

When the debug core has been defined and connected, you can implement the debug core as a block for inclusion in the netlist design. Use the implement_debug_core command to implement the core.


-channel_start_index <arg> - (Optional) The channel index to use for the connection. If more than one signal has been specified, this is the channel index where connections will start to be added. Channel indexes are numbered starting at 0.
Note: If this argument is not specified, the tool will place connections on the first available channel index.
-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.

<port> - (Required) The name of the port to connect signals to. The port must be referenced by the core_name/port_name.

<nets> - (Required) A list of one or more net names from the netlist design to connect to the specified debug port.


The following example creates a new PROBE port on the myCore debug core, increases the PORT_WIDTH property of the port in order to prepare it to receive the number of signals to be connected, and connects signals to the port starting at the third channel position (index 2).
create_debug_port myCore PROBE
set_property PORT_WIDTH 8 [get_debug_ports myCore/PROBE1]
connect_debug_port myCore/PROBE1 [get_nets [list m0_ack_o m0_cyc_i \
   m0_err_o m0_rty_o m0_stb_i m0_we_i ]] -channel_start_index 2
Note: If you specify too many nets to connect to the available channels on the port, the tool will return an error and will not connect the ports.