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IP-XACT addressBlock vs SystemRDL addrmap/regfile

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Sorry, but this question is related to SystemRDL, but there is no discussion board for that, so I post here that is the closest.

IP-XACT addressBlock has a range attribute that I can define and leave some space at the end of the addressBlock.  I would like to do something similar in SystemRDL.  I tried defining a regfile (no associated a top-level RTL), but I cannot see an equivalent range attribute.  Then I thought about using an addrmap (although it has an associated RTL view), but again that one does not have a range attribute either!

How do I leave some reserved space at the end of an addrmap or a regfile?  If I had an element after the last register, I could leave some space.  But not sure what to do at the end?  Note that this regfile is meant to be instantiated in various other addrmaps and need to have a specific range.  Is there such a thing as a null register?  Maybe I should declare a register array with no access "sw = na" attribute?

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