According to the datasheet you just posted:
Although the ADIS16400/ADIS16405 produce data independently, these operate as SPI slave devices that communicate with system (master) processors using the 16-bit segments displayed in Figure 11.
The device operates as a slave, and thus there is no requirement to jump between master/slave for each communication. Have you read my page?
A simple yes/no will suffice.
Have you read the datasheet?