  In the ALICE read-out and trigger system, the present GBT and CRU based
solution will also serve for Run4 without major modifications. By now, the GBT
protocol has been superseded by lpGBT. Extensions of the ALICE system (e.g. the
planned FoCal and ITS3 detector) will therefore require to use lpGBT while
keeping the compatibility with the existing system. In this paper we show the
implementation and testing of a possible integration of the lpGBT-FPGA IP into
the CRU firmware, allowing the extension of the present system, keeping it more
versatile and future-proof.
