Advanced Configuration and Power Interface Specification

Device Configuration
Name Definition DWORD Bit Offset
(DWORD)
Horizontal
Offset
Offset of Shape Origin from Panel Origin
(in mm). A value of 0xFFFFFFFF
indicates that this field is not supplied.
Bit
Offset
(Buffer)
2 144 16
Length
(bits)
Note: All additional buffer entries returned may contain OEM-specific data, but must begin in a {GUID,
data} pair. These additional data may provide complimentary physical location information specific
to certain systems or class of machines.
Figure 6-35 Default Shape Definitions
Shape = Round/Oval
Shape = Square/
Vertical Rectangle/
Horizontal Rectangle/
Unknown
Shape = Trapezoid
Height
Height
Height
Origin: Lower, Left
Width
Origin: Lower, Left
Width
Origin: Lower, Left
Width
The Origin of a shape is always in
the in lower left corner.
Shape = Chamfered
Height
Width
Origin: Lower, Left
Rotation = 0 for all
displayed reference
shapes
Buffers 1 – N Return Value (Optional):
Buffer 1 Bit [127:0] – GUID 1
Buffer 2 Bit [127:0] – Data 1
Buffer 3 Bit [127:0] – GUID 2
Buffer 4 Bit [127:0] – Data 2
……
Figure 6-36 provides an example of a rendering of the external device connection points that may be
conveyed to the user by _PLD information. Note that three _PLDs (System Back Panel, Power
Supply, and Motherboard (MB) Connector Area) that are associated with the System Bus tree (_SB)
object. Their Reference flag is set indicating that are used to provide the user with visual queues for
identifying the relative locations of the other device connection points.
The connection points (C1 through C16) are defined by _PLD objects found in the System bus tree.
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