1. A method of designating a least recently used entry in a content addressable memory comprising: storing a plurality of resource values in entries of the content addressable memory with respective count values indicating a time sequence in which the resource values were stored; changing selected count values to higher count values in response to access requests for corresponding resource values; and after each access request, searching the content addressable memory to find one of the entries having a lowest count value, and writing the resource value of the entry having the lowest count value to a least recently used register.