You may want to take a look at this post. It’s an attempt to fill in the gaps in the poor documentation.
The DW1000 user manual wasn’t perfect but was as good as you can reasonably expect for a complex part. The DW3000 one is a mess with whole sections missing.
My personal favourite was where manual said to refer to the device driver source code for details of how to do something. And then the source code (before it became closed source) then modified registers that weren’t listed in the manual or changed fields that the manual either didn’t mention or listed as reserved, do not change.
If we weren’t already using the DW1000 I wouldn’t have touched the DW3000 purely due to the poor documentation.