《CEC_White_Paper》.pdf

CEC is coming to HDMI. quantum data white paper Designing CEC into your next HDMI Product There is a little-known one-wire bus snaking its way through your HDMI products. The bus, known as the consumer electronics control (CEC) bus, is the basis for a new level of automatic control in HDMI-interfaced systems. With the recent release of a CEC compli- ance test specification and commercial CEC test equipment, consumer electronic com- panies are now poised to implement CEC in their products. In fact, new CEC-enabled products are expected to begin shipping in April 2006. The CEC bus allows all products in the system The basic technology of the CEC bus originated in Europe, on the SCART interface, to potentially discover and communicate with where it’s been used with great success for many years. HDMI borrows and improves on each other the basic SCART technology, allowing AV products to discover and communicate with one another across a system. CEC makes possible global controls, which build on exist- ing point-to-point E-DDC-based “plug play” automation to minimize the number of IR remotes and key-presses required for basic operation of a system. CEC enables global sim- plified (single remote) system control in HDMI- CEC assumes that all AV source products in a system are directly or indirectly connected interfaced systems to a “root” display. HDMI connections form an up-side-down tree, with a display as the “root”, switches as “branches”, and various source products as “leaf” nodes. For example, CEC allows users to connect a mix of AV products as shown in Figure 1, pl