The DataMover MM2S soft shutdown is initiated by the active-High assertion of the input signal mm2s_halt . During a soft shutdown, DataMover gracefully completes the existing transactions on the AXI4 side. You will find data on the streaming side sometime while its exiting gracefully. The m_axis_mm2s_tdata data output is then driven with invalid data values. The MM2S completes all committed memory map requests presented on the MM2S Memory Map Address Channel. Input data from the Memory Map Data Channel received during the cleanup operations are discarded.
When the soft halt operations are completed, the MM2S asserts the mm2s_halt_cmplt output. This output remains asserted until the MM2S is reset through the hard reset input m_axi_mm2s_aresetn (or m_axis_mm2s_cmdsts_aresetn if asynchronous command interface is in use).