The pynq.pl module facilitates the bitstream class to be used on the Programmable Logic (PL). The Bitstream class manages downloading of bitstreams onto the PL. It converts the bit files into bin files and leverages the FPGA manager framework to download them onto the PL. It handles full bitstreams and partial bitstreams. It also manages the device tree segment associated with each full or partial bitstream.
pynq.bitstream