Fullfledged mode uses all the register maps of deinterlacer only, scaler only, 420-422 chroma resampling, and 422-444 chroma resampling only registers mentioned above. Letterbox is also included in fullfledge mode. In this FullFledged mode there are two AXI GPIO IPs in the VPSS. One AXI GPIO, that is, reset_sel_axis is configured with width 2. This resets the subcores like v_csc, v_vcresampler, v_hcresampler, v_letterbox, v_hscaler and v_vscaler through the upper bit of its 2-bit width output and the lower bit of its 2 bit output is connected to the VPSS output signal, that is, arestn_io_axis[0:0]. The second AXI GPIO, that is, reset_sel_axi_mm is configured with width 1 to reset the v_deinterlacer and VDMA IPs.
For more information, AXI GPIO LogiCORE IP Product Guide (PG144) [Ref 11]
The Letterbox register map is described below.