A digitalizing board for the prototype array of LHAASO WCDA

In this paper, a digitalizing board for readout of PMT signals in the prototype array of WCDA （water Cerenkov detector array） for LHAASO （Large high altitude air shower observatory） is designed. The prototype array is composed of 9 PMTs, including the pulse time and charge measurement from the PMTs, and clock generation and trigger decision. In the digitalizing board, FPGA reconfiguration and data readout via VME bus are implemented. Test results show that the performances meet well with the requirements of readout electronics. It has been installed in Yangbajing and tests with the prototype array and DAQ is ongoing.