In an exemplary computer system having one or more masters configured to the same slave memory using a protocol, such as the AMBA AXI protocol, a master provides an ID field to the memory as part of a data request, where the ID field has a line ID sub-field that represents a line ID value that uniquely identifies a particular cache line (or subset of cache lines) in the master, where the memory returns the line ID value back to the master along with the retrieved data. The master uses the line ID value to identify the cache line into which the retrieved data is to be stored. In this way, the master does not need to maintain a queue of address buffers to retain the addresses for data requests currently being processed, where the size of the queue limits the number of parallel in-service data requests by the master.