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In recent years more and more applications are built on FPGA technology supported by additional analog-digital and digital-analog circuits like video processors or RAM-DAC modules. Configuring of reprogrammable circuits is made by special bitstream loading. Additional circuits in most cases are controlled by a two-wire I/sup 2/C bus. In this paper an in-system reconfiguring and I/sup 2/C control concept without extra hardware is described.