Advanced Configuration and Power Interface Specification

Device Configuration
Offset Field Name Definition
Byte
18
Byte
19
Range length, _LEN bits [23:16]
Range length, _LEN bits [31:24]
This field contains Bits [23:16] of the memory range length.
The range length provides the length of the memory range in
1-byte blocks.
This field contains Bits [31:24] of the memory range length.
The range length provides the length of the memory range in
1-byte blocks.
Note: Mixing of 24-bit and 32-bit memory descriptors on the same device is not allowed.
See Section 19.6.80, “Memory32 (Memory Resource Descriptor Macro),” for a description of the
ASL macro that creates a 32-bit Memory descriptor.
6.4.3.4 32-Bit Fixed Memory Range Descriptor
Type 1, Large Item Name 0x6
This memory range descriptor describes a device’s memory resources within a 32-bit address space.
Table 6-207 32-bit Fixed-Location Memory Range Descriptor Definition
Offset Field Name Definition
Byte 0 32-bit Fixed Memory Value = 0x86 (10000110B) – Type = 1, Large item name = 0x06
Range Descriptor
Byte 1 Length, bits [7:0] Value = 0x09 (9)
Byte 2 Length, bits [15:8] Value = 0x00
Byte 3 Information This field provides extra information about this memory.
Bit [7:1] Ignored
Bit [0] Write status, _RW
1 writeable (read/write)
0 non-writeable (read-only))
Byte 4 Range base address,
_BAS bits [7:0]
Address bits [7:0] of the base memory address for which the card may
be configured.
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Byte
10
Byte
11
Range base address,
_BAS bits [15:8]
Range base address,
_BAS bits [23:16]
Range base address,
_BAS bits [31:24]
Range length, _LEN bits
[7:0]
Range length, _LEN
bits[15:8]
Range length, _LEN bits
[23:16]
Range length, _LEN bits
[31:24]
Address bits [15:8] of the base memory address for which the card may
be configured.
Address bits [23:16] of the base memory address for which the card
may be configured.
Address bits [31:24] of the base memory address for which the card
may be configured.
This field contains bits [7:0] of the memory range length. The range
length provides the length of the memory range in 1-byte blocks.
This field contains bits [15:8] of the memory range length. The range
length provides the length of the memory range in 1-byte blocks.
This field contains bits [23:16] of the memory range length. The range
length provides the length of the memory range in 1-byte blocks.
This field contains bits [31:24] of the memory range length. The range
length provides the length of the memory range in 1-byte blocks.
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