AD7691 SDO status on Power Up

We are using 2 AD7691 in 4 wire CS mode with 4 flash memory ICs using the same SPI bus, these 2 are connected to a TI TPS430 u Controller.  The power to the ADCs/flash is controlled by a FET and the TPS430.  The SDO pin on the ADCs is tied low after power up, SDI does go high right after power up, but CNV stays low.  What is should the status of SDO be right after power up?

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