In datasheet rev. A VDDflash is in the range 1.7 V to 1.9 V, but in datasheet rev. D VDDflash is in the range 2.7 V to 3.6 V - this applies to all processor revisions?
No, this does not apply to all processor revisions. In early 2014 there was a change in FLASH die in the BF51x family, which required a change in VDD_FLASH from 1.8v nominal to 3.3v nominal. This did not change the processor revision, just the built in flash.
The "old" flash part numbers were labeled ADSP-BF518F, and the "new" 3.3v flash part numbers are labeled ADSP-BF518F16.
There is also an EE-Note associated with this flash die change and driver required to use it: http://www.analog.com/media/en/technical-documentation/application-notes/EE367.pdf
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