CAMERA CONTROL INTERFACE EXTENSION WITH IN-BAND INTERRUPT

摘要

Master and slave devices may be coupled to a control data bus. A method includes controlling data transmissions over a bus from a master device, where data bits are transcoded into symbols for transmission across two lines of the bus and a clock signal is embedded within symbol transitions of the data transmissions, and providing an interrupt period, during which one or more slave devices coupled to the bus can assert an interrupt request on a first line of the bus, within part of a heartbeat transmission by the master device over the first line and a second tine of the bus. The interrupt request may be an indicator that the asserting slave device wishes to request some action by the master device.

主权项

1. A method operational on a master device, comprising:
controlling data transmissions over a bus coupling the master device and one or more slave devices, wherein data bits are transcoded into symbols for transmission across two lines of the bus and a clock signal is embedded within symbol transitions of the data transmissions; and monitoring the bus during an interrupt period associated with transmission of a heartbeat word by the master device over a first line and a second line of the bus, wherein the one or more slave devices are enabled to assert an interrupt request using the first line of the bus in response to the transmission of the heartbeat word, wherein the transmission of the heartbeat word produces a pulse on a receive clock generated from signaling state of the first line and the second line.