Camera control interface extension bus

摘要

System, methods and apparatus are described that offer improved performance of a serial bus used for Inter-Integrated Circuit (I2C) and/or camera control interface (CCI) operations. CCI extension (CCIe) devices are described. CCIe devices may be configured as a bus master or as a slave. In one method, a CCIe transmitter may generate a transition number from a set of bits, convert the transition number into a sequence of symbols, and transmit the sequence of symbols in the signaling state of a two-wire serial bus. Timing information may be encoded in the transitions between symbols of consecutive pairs of symbols in the sequence of symbols. For example, each transition may cause a change in the signaling state of at least one wire of the two-wire serial bus. A CCIe receiver may derive a receive clock from the transitions in order to receive and decode the sequence of symbols.

主权项

1. A method of data communication comprising:
generating, at a first device, a transition number from a set of bits; converting, at the first device, the transition number into a sequence of symbols, wherein timing information is encoded in transitions between symbols in the sequence of symbols; and transmitting, from the first device, the sequence of symbols on a two-wire serial bus when the two-wire serial bus is operated in a first mode of operation, wherein each transition between consecutive symbols causes a change in a signaling state of the two-wire serial bus, wherein, while the two-wire serial bus is in the first mode of operation, the sequence of symbols is ignored by a second device coupled to the two-wire serial bus, and wherein the second device is configured for communicating on the two-wire serial bus using a second mode of operation of the two-wire serial bus.