Re: How to step through an enumerated type?


I have not checked out how XST handles enumeration attributes. You may
have some luck using the 'val and 'pos attributes to replicate 'succ:

next_enum_value :=
enum_value_type'val(enum_value_type'pos(current_enum_val)+1);

You will have to ensure you don't attempt to index past the end of the
enum.

If you're iterating over a fixed sequence of elements in the
enumeration type you should try using the 'range attribute in a loop or
a for-generate:

for i in enum_value_type'range loop
...
end for;

With Synplify this works provided the enum has a binary encoding. If
you only want to iterate over a subset of the enum then you can create
a subtype with the necessary bounds and use its 'range attribute for
the loop boundy condition.

.

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