A method and an apparatus of mapping a resource unit is provided. The protective cover can be attached to a connector so as to be fitted with a through-lock portion of the connector and the cover portion is then closed. Active customers can include customers with portable devices, customers with hand-held devices, customers who are viewers of a pay-per-view system and customers who are viewers of a web site. Adjacent-indexed data values are acquired substantially simultaneously from even- and odd-indexed tables with the first-indexed value extracted from the even-indexed table when an integral portion of a memory address is even and from the odd-indexed table when the integral portion is odd. User information is updated to reflect any changes. In one example, a programmable logic device includes a plurality of programmable logic blocks and a plurality of logic cells within at least one of the PLBs, where each logic cell includes a four input lookup table configured to provide a 4-LUT output signal to associated carry logic.