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In this paper, we present and analyze a sophisticated communication architecture that allows to integrate many different modules into a system by FPGA reconfiguration at runtime. Furthermore, we examine how this architecture can be implemented on low-cost Spartan-3 devices. It will be demonstrated that modules can be exchanged in a system without disturbing the communication architecture. The paper points out, that the capabilities of Spartan-3 FPGAs are sufficient to build complex reconfigurable systems.