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

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

Reg 0x0 - SPI address, 16 bits, R/W

Reg 0x1 - SPI write data, 16 bits, R/W

Reg 0x2 - SPI read data, 16 bits, RO

Reg 0x3 - unused, reserved for SPI status/control, 16 bits, R/W

Reg 0x4 - SPI slave device chip select, 16 bits, R/W