AR# 1432: HARDWARE DEBUGGER: Many internal signals cannot be selected
HARDWARE DEBUGGER: Many internal signals cannot be selected
When running the Hardware debugger, several internal signals cannot be selected although they are present in the .lca and .xtf files
Not all siganls can be selected by hardware debugger. Only the signal names that show up in the <design>.ll file are available. The .ll file lists all internal nodes that corespond to a probe point such as CLB outputs.
If the name is not on the list then there is no way to force it to be on the list without re-implementing the design. If you would like to Re-implement the design for this purpose, you can force the net to be external to a CLB by placing an X attribute on the net. This should put the net name at a probable location and makebits will enter the proper names into the .ll file