The wishbone specification refers to signals being qualified by other signals:
The strobe output [STB_O] indicates a valid data transfer cycle. It is used to qualify various other signals on the interface such as [SEL_O()].
What does this mean exactly? I can only assume that they meant that
[SEL_O()] may be invalid while
[STB_O] is not asserted.
I have not been able to find any definition for this term online. I would appreciate any references to textbooks or other reliable sources.