{HEAD ~ An AMBA AHB} couples the cores and {TAIL ~ most other functional units} on the IC 
couples
{ HEAD ~ An AMBA AHB } couples the cores and { TAIL ~ most other functional units } on the IC
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH