New Backend Processor Card for the Pipelined Readout System at Belle II

The Belle II experiment at the Super KEKB storage ring at KEK will search New Physics beyond the Standard Model, with 40 times higher luminosity than at KEKB. Much higher event rates are accounted for by moving all front-end digitizers inside or near the detector, and the resulting data received by a common pipeline readout platform developed in KEK. There are about 200 such platforms in the Belle II experiment. We have developed a new Intel Atom based processor card to handle the data and send it to the event building system in three steps. We fully utilize the PCI bus bandwidth and meet the high data rate requirement. In this report, we describe this processor card and the results from testing it in a realistic setup.