Abstract: An apparatus for linking a hot-plug device to a host includes a slave interface circuit for connection to the host; a master interface circuit for connection to the hot-plug device; and direction, data, and clock lines that link the master and slave interface circuits. A control logic circuit detects a Presence Detect signal on the direction line. A method of determining a connection between a host and a hot-plug device includes asserting a direction signal on a direction line to control a direction of a flow of data between the host and the hot-plug device; toggling the direction signal to indicate a presence of the hot-plug device; and indicating a disconnect after a given period of inactivity in the toggling. A method of linking a host and a hot-plug device interface circuit for connection to a hot-plug device includes asserting a Presence Detect signal on the direction line.

Abstract: An apparatus for linking a hot-plug device to a host includes a slave interface circuit for connection to the host; a master interface circuit for connection to the hot-plug device; and direction, data, and clock lines that link the master and slave interface circuits. A control logic circuit detects a Presence Detect signal on the direction line. A method of determining a connection between a host and a hot-plug device includes asserting a direction signal on a direction line to control a direction of a flow of data between the host and the hot-plug device; toggling the direction signal to indicate a presence of the hot-plug device; and indicating a disconnect after a given period of inactivity in the toggling. A method of linking a host and a hot-plug device interface circuit for connection to a hot-plug device includes asserting a Presence Detect signal on the direction line.

Abstract: A method for controlling hot-plug behavior includes identifying a hot-plug event caused by a hot-plug device; generating hot-plug threads that execute a hot-plug operation; executing a finite state machine state sequence to regulate hot-plug threads involved in the hot-plug operation; and completing the hot-plug operation at the end of the finite state machine state sequence. A computer usable medium has computer readable program code embodied therein for causing a computer system to execute the method for controlling hot-plug behavior. A hot-plug control system for a computer system includes a hot-plug device; a set of hot-plug threads that regulate operations in the hot-plug device; and a finite state machine that controls execution of instructions using the set of threads.