The Xilinx® Waveform Viewer displays a waveform diagram of selected signals in your System Generator design. Waveforms can be displayed in the Waveform Viewer after running a Simulink simulation. Inputs and outputs of blocks in the Xilinx Blockset can be displayed in the Waveform Viewer.
In your design, you can select the signals that will be monitored in the Waveform Viewer. As you develop and troubleshoot your design, the waveforms for the signals you are monitoring will be updated in the Waveform Viewer each time you simulate the model.
The Xilinx Waveform Viewer used with System Generator is also used by other tools in the Vivado® toolset. The Waveform Viewer is used to analyze a design and debug code in the Vivado simulator and to display data captured by the Integrated Logic Analyzer (ILA) for in-system debugging.
For information on using the Waveform Viewer to develop and troubleshoot your design, see this link in the Vivado Design Suite User Guide: Logic Simulation (UG900).