State of the art processor systems, esp. in embedded systems, are not able to process data under real-time conditions especially with throughput rates near 10 Gbps. So, when using interfaces like PCI Express (PCIe) or Infiniband or 10G-Ethernet for 10 Gbps data throughput, special data-paths have to process the high throughput rate data. But tasks like connection management or time uncritical control messaging are better manageable by a processor. According to the invention it is proposed a kind of multiplexer architecture that is needed to split between control and data-path access for a PCI Express based architecture.