1)AMBA protocols have any modes,like simplex,full duplex or half duplex?
Not really.
The various AMBA protocols all work with specified timings, there aren't any modes to switch between in each protocol.
Probably best reading the protocol documents and you will quickly see the bus timings and how data traffic appears.
Perhaps just my lack of understanding, but to me terms like simplex, duplex and half duplex are all serial protocol type flows, controlling when data is sent and received and whether this happens at the same time in both directions, or one following the other. So not really what I would expect to see on AMBA protocols.