The VPSS in the scaler only mode has two resets. One of them can be driven from an external
source which resets the complete VPSS. The other reset is internal to the VPSS subsystem
in the scaler only mode and can be controlled by programming the GPIO. The internal
reset controls the resetting of vscaler, hscaler, stream FIFOs, and the outgoing
aresetn_io_axis
pin.
For more information, see AXI GPIO LogiCORE IP Product Guide (PG144).