A single rotator successively connects a set of access ports to a set of memory devices and a multi-port controller and connects the set of memory devices and the multi-port controller to the set of access ports. The rotator has a set of inlets and a set of outlets and cyclically connects each inlet to each outlet during a rotation cycle. A set of inlet selectors connecting to the inlets of the rotator and a set of outlet selectors connecting to the outlets of the rotator are coordinated to concurrently connect the access ports to the memory devices and to the master controller through the rotator, and concurrently connect the memory devices and the master controller to the access ports. Each memory device connects to an inlet selector and a corresponding transposed outlet selector.