Readout system with 2-channel 8-bit 1GHz FADC based on RAIN1000Z1 ZYNQ module for crystal detector

RAIN1000Z1 is a high performance readout module we developed last two years. It is based on the ZYNQ architecture SOC chip from Xilinx and ZYNQ is the new architecture of FPGA with dual high performance ARM Cortex-A9 processors and high capacity programmable logic. We developed a series of readout system with the RAIN1000Z1 module based on ZYNQ architecture. For the crystal scintillator detectors, such as BC-501A liquid scintillator in a Teflon vessel we used for neutron background measurement in CJPL (China JinPing under-ground Lab) experiment, we developed a two channels 8-Bit 1GHz FADC readout system with RAIN1000Z1 module. With the two R1250 PMTs in the dual end of detector, the analog signals are send to FADC and the digital results is triggered and anticoincidence in the FPGA logic, the final triggered data is send to computer by gigabits Ethernet with ARM processor running Embedded Linux. HMCAD1511 from ADI is used for 8-Bit 1GSPS analog data converter, and the high speed, low jitter 1GHz clock is generated by LMK04803B from TI. With the benefit of high bandwidth and high performance inter connected HP bus between ARM processor (PS) and FPGA logic (PL), the FADC's data gathered by FPGA logic is buffered and transferred to the ARM processor's DDR3 SDRAM running at 1066MHz with CDMA function without many CPU time. The readout interface's data throughput can reach more than 600Mbps with gigabits Ethernet. In this paper, details of the hardware design and HDL design will be introduced.