1. A sequencer unit adapted for generating an output data stream, said sequencer unit comprising: a first instruction processing unit adapted for receiving and processing a stream of instructions, wherein in case data is required by a certain instruction, a corresponding data read request for fetching said data is issued; an instruction buffer adapted for buffering instructions that wait for requested data; and a second instruction processing unit adapted for receiving requested data that corresponds to one of the issued data read requests, for assigning the requested data to the corresponding instructions buffered in the instruction buffer, and for processing said instructions in order to generate the output data stream.