Advanced Configuration and Power Interface Specification

Device Configuration
Offset Field Name Definition
Byte 33 Address Translation
offset, _TRA bits[31:24]
Byte 34 Address Translation
offset, _TRA bits[39:32]
Byte 35 Address Translation
offset, _TRA bits[47:40]
Byte 36 Address Translation
offset, _TRA bits[55:48]
Byte 37 Address Translation
offset, _TRA bits[63:56]
Byte 38 Address length, _LEN
bits[7:0]
Byte 39 Address length, _LEN,
bits[15:8]
Byte 40 Address length, _LEN
bits[23:16]
Byte 41 Address length, _LEN
bits[31:24]
Byte 42 Address length, _LEN
bits[39:32]
Byte 43 Address length, _LEN
bits[47:40]
Byte 44 Address length, _LEN
bits[55:48]
Byte 45 Address length, _LEN
bits[63:56]
Byte 46 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 QWordIO (page 875), QWordMemory (page 876) and ASL_QWordAddressSpace for a
description of the ASL macros that creates a QWORD Address Space descriptor.
6.4.3.5.2 DWord Address Space Descriptor
Type 1, Large Item Name 0x7
The DWORD address space descriptor is used to report resource usage in a 32-bit address space
(like memory and I/O).
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