When the PCMCIA bus enumerator is called at its enumeration entry point, it will create a subtree that represents everything subordinate to the PCMCIA adapter. The following diagram shows the location and possible representation of a PCMCIA hardware tree:
The PCMCIA bus enumerator handles two levels of device nodes: the adapter device node and the card device node. The adapter device node contains the configuration information for the PCMCIA adapter. The card device node contains the configuration information for the PC card in the adapter's socket. These device nodes are created through the sequence of operations discussed in the following sections.