HP Dc7900 An Overview of Current Display Interfaces - Page 13

Display Interface Comparison Table VGA DVI HDMI DisplayPort Connector type 15-pin highdensity Dsubminiature; often with thumbscrews for latching. Unique 24-pin, 3row main field plus 4 pin MicroCross section if DVI-I Unique 19-pin dual-row connector (HDMI-A) Unique 20-pin dual-row connector with latch. Capacity/ bandwidth Indef.; usually OK to about 150+ MHz pixel rates. 4.8 Gbit/sec. (single-link); 9.6 Gbit/sec. (duallink) 4.8 Gbit/sec. through HDMI 1.2; HDMI 1.3 spec to ~9.6 Gbit/sec. Up to 10.8 Gbit/sec. if all four lanes used. Electrical layer 0.7 Vp-p analog video with separate TTL syncs. Silicon Image TMDS*, 3 or 6 data pairs plus clock pair. Silicon Image TMDS*, 3 data pairs plus clock pair. PCI-Express, 1, 2, or 4 data pairs ("lanes") with embedded clock. Audio No support No support Yes; effectively mandatory on HDMI-A Optional Content protection None HDCP** (opt.) HDCP** (opt.) HDCP** (opt.) Other channels VESA Display Data Channel (DDC) VESA DDC VESA DDC, Consumer Electronics Control (CEO) AUX channel (1Mbit/sec., bidirectional gen. purpose) Controlling authority None; DDC version was established by VESA. Digital Display Working Group (defunct) HDMI Founders; HDMI Licensing, LLC Video Elect. Standards Association (VESA) * - TMDS - Transition Minimized Differential Signaling, a Silicon Image trademark for their proprietary differentialdrive electrical layer. ** - HDCP - High Definition Content Protection, referring to a system developed by Intel and licensed by Digital Content Protection, LLC, see http://www.digital-cp.com/home for more information. NOTE: DisplayPort also supports DPCP, a content protection system developed for the interface by Philips Semiconductor. Neither HDCP or DPCP are mandated by the DisplayPort standard, and both specifications are separate and maintained by their respective originators. At this point, HDCP is expected to be the content-protection system of choice on all DisplayPort implementations. 13