Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
IsMinFixed specifies whether the minimum address of this bus number range is fixed (MinFixed) or
can be changed (MinNotFixed). If nothing is specified, then MinNotFixed is assumed. The 1-bit
field DescriptorName. _MIF is automatically created to refer to this portion of the resource
descriptor, where ‘1’ is MinFixed and ‘0’ is MinNotFixed.
IsMaxFixed specifies whether the maximum address of this bus number range is fixed (MaxFixed)
or can be changed (MaxNotFixed). If nothing is specified, then MaxNotFixed is assumed. The 1-bit
field DescriptorName. _MAF is automatically created to refer to this portion of the resource
descriptor, where ‘1’ is MaxFixed and ‘0’ is MaxNotFixed.
Decode specifies whether or not the device decodes the bus number range using positive
(PosDecode) or subtractive (SubDecode) decode. If nothing is specified, then PosDecode is
assumed. The 1-bit field DescriptorName. _DEC is automatically created to refer to this portion of
the resource descriptor, where ‘1’ is SubDecode and ‘0’ is PosDecode.
AddressGranularity evaluates to a 16-bit integer that specifies the power-of-two boundary (- 1) on
which the bus number range must be aligned. The 16-bit field DescriptorName. _GRA is
automatically created to refer to this portion of the resource descriptor.
AddressMinimum evaluates to a 16-bit integer that specifies the lowest possible bus number for the
bus number 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 16-bit field DescriptorName._MIN is automatically created to refer to this
portion of the resource descriptor.
AddressMaximum evaluates to a 16-bit integer that specifies the highest possible bus number for the
bus number 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 16-bit field DescriptorName._MAX is automatically created to refer to this
portion of the resource descriptor.
AddressTranslation evaluates to a 16-bit integer that specifies the offset to be added to a secondary
bus bus number which results in the corresponding primary bus bus number. For all non-bridge
devices or bridges which do not perform translation, this must be ‘0’. The 16-bit field
DescriptorName._TRA is automatically created to refer to this portion of the resource descriptor.
RangeLength evaluates to a 16-bit integer that specifies the total number of bus numbers decoded in
the bus number range. The 16-bit field DescriptorName. _LEN is automatically created to refer to
this portion of the resource descriptor.
ResourceSourceIndex is an optional argument which evaluates to an 8-bit integer that specifies the
resource descriptor within the object specified by ResourceSource. If this argument is specified, the
ResourceSource argument must also be specified.
ResourceSource is an optional argument which evaluates to a string containing the path of a device
which produces the pool of resources from which this I/O range is allocated. If this argument is
specified, but the ResourceSourceIndex argument is not specified, a zero value is assumed.
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 operators.
902 April, 2015 Version 6.0