An apparatus and system for retaining and installing rivets into a belt fastener includes a collated rivet strip comprising connected upper and lower strips and retaining a predetermined configuration of rivet heads therebetween. This structure solves difficulties of mini-motors such as difficulties of handling the motor, difficulties of mating those elements each other, and time-consuming bonding action. The sources of window swap operations and the register management logic are configured to cooperate according to an arbitration scheme to arbitrate between conflicting window swap operations to be performed using the interface. In the event it is determined that the first request can be interleaved with the second request, the first request is interleaved with the second request.