DisplayPort - Overview General A Video Electronics Standards Association (VESA) Standard. DisplayPort is a digital display interface standard (approved May 2006, current version approved in April of 2007). Defines a new license-free, royalty-free, state-of-the-art digital audio/video interconnect. Envisioned to replace both DVI and VGA interface. Applications Connecting a computer and its display. Connects PCs, computer monitors, graphic cards. Can be used for internal display panels. TV displays. Projectors. 第1页/共20页 DisplayPort - Architecture 第2页/共20页 DisplayPort – Aux Channel Operation Aux Channel provides Device services (Content Protection & EDID) Device services over I2C emulation Content Protection (HDCP) EDID Link services (link training) - Negotiates how DisplayPort devices communicate during link training, including: Number of Lanes (1, 2, 4) Lane Rate ( or ) Equalization Levels Aux Channel Operation AUX CH of DisplayPort is a half-duplex, bi-directional channel Source device is the master - AUX CH Requester Sink device is the slave - AUX CH Replier Source device initiates request transactions Sink device responds with a reply transaction 第3页/共20页 DisplayPort – Two Hot Plug Types IRQ (interrupt request) pulse - to 1ms Source Device must read the link / sink status field of the DPCD and take corrective action. Hot plug event pulse - longer than 2ms Source must read the receiver capability field and link / sink status field of the DPCD and take corrective action. 第4页/共20页 DisplayPort – Test Requirements Physical layer testing (main link and aux channel) Pattern testing – Timings and test patterns Link layer testing – Compliance and debug tools HDCP testing – Compliance and production Functional testing – Signal analysis, EDID, etc. DDC/CI (MCCS) 第5页/共20页 Quantum Data’s DisplayPort Test Solutions Pattern testing Supports VESA timings up to 268MHz pixel rates (higher pixel rates supported soon). Over 300 test
