There might be a discrepancy with the DSDO enable/disable setting in the datasheet.
According to Table 7 (page 31) SDO is enabled (e.g. for daisy chain) with DSDO = 1 (default)
But according to chapter "8.5.3.2. Asynchronous Update" (page 28) "daisy-chain" needs DSDO=0 (which would mean disabled SDO)
Is there a bug in the datasheet or do I misunderstand these points?