The Side-Band Interface(SBI) is a basic 3-wire interface that consists of the DATA, CLK and SHFT_LD# pins. The SBI is used to shift data into a 20-bit long shift register. When the SHFT_LD# pin is high, the rising edge of CLK can shift DATA into the shift register. After shifting data, the falling edge of SHFT_LD# clocks the shift register contents to the SBI output register.

While SBI is enabled by the SBEN pin, OE[7:9, 11, 12]# pins are disabled and DATA, CLK and SHFT_LD# are enabled on the OE5#, OE6# and OE10# pins, respectively.

When power has been applied, and SBEN = 1, the SBI is active regardless of the CKPWRGD_PD# pin state. This characteristic allows loading the shift register and transferring the contents to the SBI output register before the first assertion of the CKPWRGD_PD# pin.