SDATAC BE wide: SDATAC BE narrow: ID BE Wide: ID BE B1: ID BE B2: ID BE B3 Here's a reproduction of the last with the bit order changed. I understand what the spec says the transfers are, but in the absence of data, I've pretty much tried all the permutations. This is MSB first, SPI1. The library in use is part of a proprietary SDK for the arm we are using, not a very vetted os, but "trustworthy" with single byte transfers, I'll have to write a lower level replacement to handle 16 bit transfers or better byte to byte transfer timings if needed.
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