AXI, Out of order

SystemVerilog
1

I have some doubts in AXI

->In AXI, Out of order is with respect to transactions or it is with respect of master/slave?

->Out of order can occur in single master/single slave system ot it can occur only in multi master system?

2

It is in the context of AXI Req<->Rsp.

In-order AXI transaction means: A master must receive its AXI Responses from the slave in the order it issued the AXI Requests.

Out-of-order AXI transaction means: A master could receive its AXI Responses from the slave in any order.

It is topology agnostic: p2p (single master/slave), crossbar, mesh, etc.