Dynamic logical mapping provides a virtual layer interposed between a host and a data storage library. The feedback data can include battery charging current, battery voltage, or power requirements of the portable device. The slot-size selection information aligns the communication packet structure of the short-ranged TDD system and the uplinkdownlink boundary of the TDD frame configuration. , Federal Express\xae, Airborne\xae, United Parcel Service\xae, DHL\xae, etc. In summer the spots on the older leaves lighten to cream and pink. The dividing circuit and the comparator form a feedback loop so that the response speed of the comparator can be increased and the ripples of the high voltage outputted from the charge pump can be decreased.