FPIX2 Project Zhou & JC

Using the Default Firmware 4 Connector (A,B,C,D) on the PMC board A & B SAMTEC Connector in the firmware Only A connector on the PMC board could be used (talking to FPGA), this is set by detector type So we change the I/O pins of the cable connecting A connector and SAMTEC A

Modify DAQ code DAQ send command the change Vth0 C 5 C 4 C 3 C 2 C 1 R 5 R 4 R 3 R 2 R 1 I 3 I 2 I 1 Shift Control BCO Shift In Chip IDRegister #Instruction 1 Code Write (followed by 2, 8, or 2816 bits of data) 001 Set (all bits in register = 1) 010 Read100 Reset (all bits in register = 0) 101 Default (set register to default value) 110

We can observe the waveform of shift_in and shift_ctrl using oscilloscope. PMC FPGA FPIX shift_in shift_ctrl shift_out

Conclusion Either FPIX is not responding or DAQ could not find the correct FPIX (chip address is set to BROADCAST=10) JC suspected the amplitude of signal sent to FPIX is too small