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Dear All, I am having problem communication with Pcam 5C from Genesys-2 board. There is also FMC Pcam Adapter in between. I can set I2C switch, enable A and B channels, attach logic analyzer to channel B and Pcam 5C on channel B. Pcam 5C is inserted properly - I can measurem VCC3V3 on pin 15. There is Microblaze in FPGA controlling Xilinx AXI IIC (2.0) with following code: sendData= 0x31; sendData= 0x00; SentByteCount = XIic_Send(IIC_BASE_ADDRESS, CAM_ID, sendData, 2, XIIC_STOP); ReceivedByteCount = XIic_Recv(IIC_BASE_ADDRESS, CAM_ID, rxBuffer, 1, XIIC_STOP); I want to read register 0x3100 of the camera on I2C address 0x78, but it fails , there is no ACK (as in attached picture). Same functions work well controlling I2C switch, so I assume there should be ACK problem. Must Pcam 5C send ACK back or it is completely ignored in Serial Camera Control Bus protocol causing I2C core failure? Thanks Linas