In our current setup please find the hardware pin connections in the slave side (948 Deserializer EVL board) • PDB pin – HIGH • BISTC pin – LOW • BISTEN pin – LOW • IDx pin – 0x58 alone HIGH • MODE_SEL0 - pin 5 HIGH,MODE_SEL1 – pin 1 HIGH • JP12 – VDDIO&VDD33 (connected via jumper) • JP5 – VDD_I2C & VDD33 (connected via jumber) • Clock frequency 400KHz • I2C established between Atmel SAMV71(Master) to Atmel SAMV71(Slave) when I used Atmel Master&Slave example code from Atmel studio. But when I try with 948 Deserializer and change to our slave address in the Atmel Master example code to 0x58/0x2C (Both I tried) the result i am getting is (0x58 NAK / 0x2C NAK ) from I2C analyser. Even after i am giving correct slave address and clock frequency in the fast mode range (400KHz) i am getting NAK. Using Analog Launch Pad when I checked the Deserializer Dev_Id register i am getting register value as 58.