Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
‘1’. For bridge devices which translate addresses, this is the address on the secondary bus. The 64-bit
field DescriptorName._MIN is automatically created to refer to this portion of the resource
descriptor.
AddressMaximum evaluates to a 64-bit integer that specifies the highest possible base address of the
I/O range. The value must have ‘0’ in all bits where the corresponding bit in AddressGranularity is
‘1’. For bridge devices which translate addresses, this is the address on the secondary bus. The 64-bit
field DescriptorName._MAX is automatically created to refer to this portion of the resource
descriptor.
AddressTranslation evaluates to a 64-bit integer that specifies the offset to be added to a secondary
bus I/O address which results in the corresponding primary bus I/O address. For all non-bridge
devices or bridges which do not perform translation, this must be ‘0’. The 64-bit field
DescriptorName._TRA is automatically created to refer to this portion of the resource descriptor.
RangeLength evaluates to a 64-bit integer that specifies the total number of bytes decoded in the I/O
range. The 64-bit field DescriptorName._LEN is automatically created to refer to this portion of the
resource descriptor.
TranslationType is an optional argument that specifies whether the resource type on the secondary
side of the bus is different (TypeTranslation) from that on the primary side of the bus or the same
(TypeStatic). If TypeTranslation is specified, then the secondary side of the bus is Memory. If
TypeStatic is specified, then the secondary side of the bus is I/O. If nothing is specified, then
TypeStatic is assumed. The 1-bit field DescriptorName. _TTP is automatically created to refer to
this portion of the resource descriptor, where ‘1’ is TypeTranslation and ‘0’ is TypeStatic. See _TTP
(page 333) for more information
TranslationDensity is an optional argument that specifies whether or not the translation from the
primary to secondary bus is sparse (SparseTranslation) or dense (DenseTranslation). It is only
used when TranslationType is TypeTranslation. If nothing is specified, then DenseTranslation is
assumed. The 1-bit field DescriptorName._TRS is automatically created to refer to this portion of
the resource descriptor, where ‘1’ is SparseTranslation and ‘0’ is DenseTranslation. See _TRS
(page 333) for more information.
TypeSpecificAttributes is an optional argument that specifies attributes specific to this resource type.
See Section 6.4.3.5.4.1,”Type Specific Attributes”.
DescriptorName is an optional argument that specifies a name for an integer constant that will be
created in the current scope that contains the offset of this resource descriptor within the current
resource template buffer. The predefined descriptor field names may be appended to this name to
access individual fields within the descriptor via the Buffer Field operatorsDescription
The ExtendedIO macro evaluates to a buffer which contains a 64-bit I/O resource descriptor, which
describes a range of I/O addresses. The format of the 64-bit I/O resource descriptor can be found in
“Extended Address Space Descriptor” (page 316). The macro is designed to be used inside of a
ResourceTemplate (page 794).
746 Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba