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Serial Digital Video Out (SDVO) is a proprietary Intel technology introduced with their 9xx-series of motherboard chipsets. SDVO makes it possible to use a 16-lane PCI express slot to add additional video signalling interfaces such as VGA and DVI monitor outputs, SDTV and HDTV television outputs, or TV tuner inputs to a system board containing an integrated Intel 9xx-series graphics processor. SDVO adaptor cards are variously designated as ADD2 (advanced digital display, second generation) or the more feature-rich MEC (media expansion card). MEC is sometimes designated as ADD2+ in Intel documents. Intel often refers to SDVO as Serial DVO to distinguish it from other forms of digital video out associated with prior product generations, such as the AGP implementation of DVO and older AGP-style ADD expansion cards which are not SDVO compatible. ==Proprietary status== Intel's non-standard extension of the PCI express interface is subject to a patent application ''Mapping SDVO functions from PCI express interface'' ((United States Application 20050172037 )) filed on 12 December 2003. According to the Intel patent application, the PCI Express standard lacks a "mechanism to make use of a digital display codec using the PCI Express connector." This limitation is attributed to PCI Express defining only a fixed-frequency interface with significant packet encoding overheads, whereas "digital displays need to have variable clocking and transfer rates and need very little overhead for the transfer of video data". The patent relates a "presence detect" mechanism to detect SDVO-type expansion cards and enable a pin-remapping of the PCI Express socket to convey SDVO signals. As of January 2007, Intel has not publicly documented an intent to promote SDVO as an industry standard, despite its potential applicability to any PCI express platform with an Integrated Graphics Processor (IGP), or the desirability from the consumer perspective that SDVO adaptor cards be compatible and freely interchangeable among all such systems. Instead, Intel is actively promoting the development of SDVO drivers across the broad range of operating systems which run on the Intel 9xx platform. In particular, Intel has established the website (intellinuxgraphics.org ) to promote fully open sourced drivers supporting all video technologies embodied in their 9xx-series platform. The upshot is that SDVO cards are compatible with a narrow range of Intel-only hardware platforms, but a broad range of software environments within that platform. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Serial Digital Video Out」の詳細全文を読む スポンサード リンク
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