AR# 1382: PPR/Foundation: Duplicate name errors when guiding designs entered in Foundation
PPR/Foundation: Duplicate name errors when guiding designs entered in Foundation
Duplicate names may get generated by Foundation in designs that have more than one schematic sheet on the top level.
If you have two schematic sheets in your design, both of which contain symbols called U1 and U2, Foundation will rename the U1 and U2 symbols in the hierarchical schematics to unique names. The Increment field in the Options -> Annotate popup window allows you to specify the increment between hierarchical schematics of the renamed symbol names.
For example, if you select an Increment of 100, the the U1 and U2 symbols are named U100 and U101 on one sheet, and U200 and U201 on another sheet. The default value is 0, and if you use numerical suffixes at the end of signal and symbol names (for example, fg_carry1, fg_carry2), and also have symbols with similar names but without a numerical suffix (for example fg_carry), Foundation may generate a symbol name that duplicates an existing name.
Change the Increment value to a number that reduces the possibility of name overlap, and re-annotate the design.
For example, as long as the numerical suffixes in your user-defined net and symbol names never exceed 99, increasing the Increment value to 100 will prevent duplicate names from being generated.