The SDI input data word is 32 (or 24) bits long and consists of the following format:

• 7 address bits, A6-A0
• 1 read or write bit, W0. W0 = 0b for write command and W0 = 1b for read command.
• 16 data bits, D15-D0
• 8-bit CRC if SPI_CRC_EN = 1b.

The SDO output data word is 32 (or 24) bits long and consists of the following format.

• 1 fault status bit, F. This bit is identical to IC_STAT1 FAULT register bit.
• 7 read back bits, A6-A0. This is the read back of incoming 7 address bits of SDI in the same SPI frame. The device captures SDI at the rising edge of SCLK and pushes it out on falling edge of SCLK.
• 16 data bits, D15-D0. This is read data of the addressed register. For write command, it is the data previously stored in the addressed register.
• 8-bit CRC if SPI_CRC_EN = 1b.