I can't grasp the highest level operation of the system you are trying to describe.
Perhaps a master is reading data from several slaves and then consolidating all the answers into a single set of data for onward transmission to something else (what, how)?
Perhaps the master is generating data to be sent to several slaves? is it sending the data one slave at a time, or is it sending all the data at once and each slave has to identify the piece that is meant for it?
Or something else entirely? Please clarify.
A general description of the sort of data and the quantity of data in each transmission would also be useful.
...R