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ADIN1110 SPI clarification (Turn around field, SPI Packet clarification)

Hi, colleagues!

While evaluating ADIN1110 we need to clarify:

  1. Pls advise what is the purpose of the turn around (TA) field in the generic SPI protocol reading package? In the documentation, this term occurs exactly once, and clarification is not obvious.
  2. The documentation says that SPI packets should be multiples of four bytes, however, for example, only 55 bits are described in Table 19. Apparently, the exchange will still consist of 64 bits, 32 of which represent a command, and 32 - the response of the chip. Then we must assume that bits 63 to 56 are reserved. Apparently, they need to be set to zero. Is it a correct understanding?