Memory devices and methods are described and shown that are capable of being configured in a chain. In one configuration, a single data input port and a single data output port are utilized at a host to communicate with the chain of memory devices. Methods for assigning identifiers to memory devices in the chain are described that include detection of a presence or absence of downstream memory devices. In selected examples, identifiers are assigned sequentially to memory devices in the chain until no additional downstream memory devices are detected.