Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Large Item Name
Extended IRQ Descriptor
QWORD Address Space Descriptor
Extended Address Space Descriptor
GPIO Connection Descriptor
Reserved
GenericSerialBus Connection Descriptor
Reserved
Value
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F – 0x7F
6.4.3.1 24-Bit Memory Range Descriptor
Type 1, Large Item Name 0x1
The 24-bit memory range descriptor describes a device’s memory range resources within a 24-bit
address space
Table 6-204 24-bit Memory Range Descriptor Definition.
Offset Field Name, ASL Field Definition
Name
Byte 0 24-bit Memory Range Value = 0x81 (10000001B) – Type = 1, Large item name = 0x01
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
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Byte 10
Range minimum base
address, _MIN, bits[7:0]
Range minimum base
address, _MIN, bits[15:8]
Range maximum base
address, _MAX, bits[7:0]
Range maximum base
address, _MAX, bits[15:8]
Base alignment, _ALN,
bits[7:0]
Base alignment, _ALN,
bits[15:8]
Range length, _LEN,
bits[7:0]
Address bits [15:8] of the minimum base memory address for
which the card may be configured.
Address bits [23:16] of the minimum base memory address for
which the card may be configured
Address bits [15:8] of the maximum base memory address for
which the card may be configured.
Address bits [23:16] of the maximum base memory address for
which the card may be configured
This field contains the lower eight bits of the base alignment. The
base alignment provides the increment for the minimum base
address. (0x0000 = 64 KB)
This field contains the upper eight bits of the base alignment. The
base alignment provides the increment for the minimum base
address. (0x0000 = 64 KB)
This field contains the lower eight bits of the memory range length.
The range length provides the length of the memory range in 256
byte blocks.
350 April, 2015 Version 6.0