The log_wave command logs simulation output for viewing specified
HDL objects with the Vivado simulator waveform viewer. Unlike
add_wave, the log_wave command does not add
the HDL object to the waveform viewer (that is, the Waveform Configuration). It
simply enables the logging of output to the Vivado simulator Waveform Database
(WDB).
Tip: To display object
values prior to the insertion time, you must restart the simulation. To avoid
restarting the simulation because of missing value changes, run the Tcl command
log_wave -r / at the start of a simulation.
This captures value changes for all displayable HDL objects in your design.Syntax:
log_wave [-recursive] [-r] [-quiet] [-verbose] <hdl_objects>...Example log_wave Tcl Command Usage
To log the waveform output for:
- All signals in the design (excluding those of alternate top modules):
log_wave -r / - All signals in a scope: /tb:
log_wave /tb/* - Those objects having names that start with a and end in b and have digits in
between:
log_wave [get_objects -regexp {^a[0-9]+b$}] - All objects in the current scope and all child scopes, recursively:
log_wave -r * - Temporarily overriding any message limits and return all messages from the
following command:
log_wave -v - The objects in the current scope:
log_wave * - Only the ports of the scope
/tb/UUT, use the command:log_wave [get_objects -filter {type == in_port || type == out_port || type == inout_port || type == port} /tb/UUT/*] - Only the internal signals of the scope
/tb/UUT, use the command:log_wave [get_objects -filter {type == signal} /tb/UUT/*]
The wave configuration settings, which include the signal order, name style, radix, and color are saved to the wave configuration (WCFG) file upon demand. See Analyzing Simulation Waveforms with Vivado Simulator.