Interface system and method with backward compatability

摘要

An interface including first (126) and second (128) transport protocol circuitry, a memory (302) and a mode controller (124). The interface includes first (401) and second (411) physical interface types which are both selectively enabled to interface a set of pads (202). The first transport protocol circuitry is operative with the first type physical interface in a first mode (702 STD) and the second transport protocol circuitry is operative with the second type physical interface in a second mode (708 HS). The memory stores a mode value (MODE_HS) indicative of the operating mode. The mode controller enables one of the physical interface types and a corresponding transport protocol based on the mode value. The first mode is the default mode, and the mode controller enables dynamic transition to the second mode. An escape indication (ESC) may be enabled during the second mode for dynamic transition back to the first mode. Programmable timing values (TIMER 1, TIMER 2) may be used to facilitate mode transitions.