| AMD Confidential |
User Manual | November 21st, 2008 |
7.25 Plug and Play Monitor Device
The Plug and Play Monitor device (PnP Monitor) conforms to the VESA Plug and Play Monitor specification and therefore supports the DDC2B standard. DDC (Display Data Channel) is the Plug and Play standard for monitors. DDC monitors are designed to meet the VESA (Video Electronic Standards Association) standard that defines the DDC implementation. If the video card also supports the DDC standard it gets from the PnP monitor device all the information about its features and makes consequently an automatic configuration for the best refresh values depending on the selected resolution.
The Plug and Play monitor device supports the DDC1 and DDC2B standards. DDC1 is primitive and a point to point interface. The monitor is always put at
Interface
The Plug and Play Monitor device model has a VGA and DVI interface connection. Connections can be only made to the VGA or DVI interface. It can be connected to the VGA or DVI connection of a video card device.
Contents of a BSD
The current state of all internal registers and any internal state variables are saved in the BSD.
Initialization and Reset State
When first initialized or reset the Plug and Play Monitors DDC registers are set to their default state. After initialization the monitor device will operate in DDC1 mode. The device will remain in the DDC1 mode until there is a valid HIGH to LOW transition on the SCL pin, when it will switch to DDC2B mode.
Differences from Real Hardware
The model attempts to match the functionality of the physical devices from a programmer's perspective. Upon
The Page Write, Acknowedge Polling, and the Write Protection feature are currently not supported.
Configuration Options
The Plug and Play Monitor device gives you the opportunity to choose from different Plug and Play Monitor device models, as shown in Figure
130 | Chapter 7: Device Configuration |