ltrace - 2024.1 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

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2024.1 English

Turns on or off printing of file name and line number of the hdl statement being simulated


ltrace [‑quiet] [‑verbose] <value>


Name Description
[-quiet] Ignore command errors
[-verbose] Suspend message limits during command execution
<value> value: on, true, yes. Otherwise set to off, false, no



Enables line-level tracing for simulation debugging purposes.

During simulation the simulation source file and line number being evaluated is returned to the Tcl console.

Tip: Process tracing with the ptrace command provides more detailed information than is available with line tracing.

This feature can also be enabled using the LINE_TRACING property on the current simulation object:

set_property LINE_TRACING on [current_sim]

The command returns the state of line tracing, or returns an error if it fails.


-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.

<value> - (Required) Enables or disables line tracing during simulation. Specify a <value> of true to enable process tracing, or false to disable it.


The following example enables line tracing:

ltrace true