So if you buy an architecture license to design your own core and you want to use AMBA in your design, you have to pay extra? I find that very surprising, but

So if you buy an architecture license to design your own core and you want to use AMBA in your design, you have to pay extra? I find that very surprising, but having never worked for an architecture licensee, I don’t have any information to contradict it. Can you share a sense of how expensive the bus license is relative to the architecture license?