Complex sentence: The QPACE network co-processor is implemented on a Xilinx Virtex-5 FPGA, which is directly connected to the I/O interface of the PowerXCell 8i.
Split into simpler sentences: The QPACE network co-processors is implemented on a Xilinx Virtex-5 FPGA. The device is directly connected to the I/O interface of the PowerXCell 8i.