Advanced Configuration and Power Interface Specification

Device Configuration
Offset Field Name Definition
Byte 8 Address range minimum, For bridges that translate addresses, this is the address space on
_MIN, bits [7:0]
the secondary side of the bridge.
Byte 9
Byte 10
Byte 11
Byte 12
Address range minimum,
_MIN, bits [15:8]
Address range maximum,
_MAX, bits [7:0]
Address range maximum,
_MAX, bits [15:8]
Address Translation offset,
_TRA, bits [7:0]
For bridges that translate addresses, this is the address space on
the secondary side of the bridge.
For bridges that translate addresses across the bridge, this is the
offset that must be added to the address on the secondary side to
obtain the address on the primary side. Non-bridge devices must
list 0 for all Address Translation offset bits.
Byte 13 Address Translation offset,
_TRA, bits [15:8]
Byte 14 Address Length, _LEN, bits
[7:0]
Byte 15 Address Length, _LEN, bits
[15:8]
Byte 16 Resource Source Index (Optional) Only present if Resource Source (below) is present.
This field gives an index to the specific resource descriptor that
this device consumes from in the current resource template for
the device object pointed to in Resource Source.
String Resource Source (Optional) If present, the device that uses this descriptor
consumes its resources from the resources produced by the
named device object. If not present, the device consumes its
resources out of a global pool. If not present, the device
consumes this resource from its hierarchical parent.
See WordIO (page 903), WordBusNumber (page 901) and ASL_WordAddressSpace for a
description of the ASL macros that create a Word address descriptor.
6.4.3.5.4 Extended Address Space Descriptor
Type 1, Large Item Name 0xB
The Extended Address Space descriptor is used to report resource usage in the address space (like
memory and I/O).
Table 6-212 Extended Address Space Descriptor Definition
Offset Field Name Definition
Byte 0 Extended Address Space Value = 0x8B (10001011B) – Type = 1, Large item name = 0x0B
Descriptor
Byte 1 Length, bits[7:0] Value = 0x35 (53)
Byte 2 Length, bits[15:8] Value = 0x00
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