= Dual SPI Controller =
Software communication registers for dual SPI controller.

 * [[SDB Device ID]] 
   * 0xdd07b826 ads52j90 variant
   * 0xba3e71ca ad9249 variant

Reg 0x0 - SDB Device ID, 32 bits, RO

Reg 0x2 - ADC_CH_INFO, 16 bits, RO
   * [7:0] number of deserializers
   * [15:8] channels per chip

Reg 0x3 - ADC_BITS, 16 bits, RO

Reg 0x8 - SPI address, 16 bits, R/W

Reg 0x9 - SPI write data, 16 bits, R/W

Reg 0xa - SPI read data, 16 bits, RO

Reg 0xb - SPI slave device chip select mask, 16 bits, R/W

Reg 0xс - SPI current CS_B lines state, 16 bits, RO