Advanced Configuration and Power Interface Specification

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ACPI Source Language (ASL)Reference 19.5.118 SPISerialBus (SPI Serial Bus Connection Resource Descriptor Macro) Syntax SPISerialBus (DeviceSelection, DeviceSelectionPolarity, WireMode, DataBitLength, SlaveMode, ConnectionSpeed, ClockPolarity, ClockPhase, ResourceSource, ResourceSourceIndex, ResourceUsage, DescriptorName, VendorData) Arguments DeviceSelection is the device selection value. This value may refer to a chip-select line, GPIO line or other line selection mechanism. _ADR is automatically created to refer to this portion of the resource descriptor. DeviceSelectionPolarity is an optional argument and can be either PolarityHigh or PolarityLow to indicate that the device is active. PolarityLow is the default. The bit field _DPL is automatically created to refer to this portion of the resource descriptor. WireMode is an optional argument and can be either ThreeWireMode or FourWireMode. FourWireMode is the default. The bit field name _MOD is automatically created to refer to this portion of the resource descriptor. DataBitLength is the size, in bits, of the smallest transfer unit for this connection. _LEN is automatically created to refer to this portion of the resource descriptor. SlaveMode is an optional argument and can be either ControllerInitiated or DeviceInitiated. ControllerInitiated is the default. The bit field name _SLV is automatically created to refer to this portion of the resource descriptor. ConnectionSpeed is the maximum connection speed supported by this connection, in hertz. The bit field name _SPE is automatically created to refer to this portion of the resource descriptor. ClockPolarity can be either ClockPolarityLow or ClockPolarityHigh. _POL is automatically created to refer to this portion of the resource descriptor. ClockPhase can be either ClockPhaseFirst or ClockPhaseSecond. _PHA is automatically created to refer to this portion of the resource descriptor. ResourceSource is a string which uniquely identifies the SPI bus controller referred to by this descriptor. ResourceSource can be a fully-qualified name, a relative name or a name segment that utilizes the namespace search rules. ResourceSourceIndex is an optional argument and is assumed to be 0 for this revision. ResourceUsage is an optional argument and is assumed to be ResourceConsumer for this revision.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. VendorData is an optional argument that specifies an object to be decoded by the OS driver. It is a RawDataBuffer. The bit field name _VEN is automatically created to refer to this portion of the resource descriptor. 798 Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba
Advanced Configuration and Power Interface Specification Description The SPISerialBus macro evaluates to a buffer that contains a SPI Serial Bus resource descriptor. The macro is designed to be used inside of a ResourceTemplate (see Section 19.2.3). 19.5.119 Stall (Stall for a Short Time) Syntax Stall (MicroSeconds) Arguments The Stall term is used to implement short-term timing requirements. Execution is delayed for at least the required number of microseconds. Description The implementation of Stall is OS-specific, but must not relinquish control of the processor. Because of this, delays longer than 100 microseconds must use Sleep instead of Stall. 19.5.120 StartDependentFn (Start Dependent Function Resource Descriptor Macro) Syntax StartDependentFn (CompatibilityPriority, PerformancePriority) {ResourceList} Arguments CompatibilityPriority indicates the relative compatibility of the configuration specified by ResourceList relative to the PC/AT. 0 = Good, 1 = Acceptable, 2 = Sub-optimal. PerformancePriority indicates the relative performance of the configuration specified by ResourceList relative to the other configurations. 0 = Good, 1 = Acceptable, 2 = Sub-optimal. ResourceList is a list of resources descriptors which must be selected together for this configuration. Description The StartDependentFn macro evaluates to a buffer which contains a start dependent function resource descriptor, which describes a group of resources which must be selected together. Each subsequent StartDependentFn or StartDependentFnNoPri resource descriptor introduces a new choice of resources for configuring the device, with the last choice terminated with an EndDependentFn resource descriptor. The format of the start dependent function resource descriptor can be found in “Start Dependent Functions Descriptor” (page 312). This macro generates the twobyte form of the resource descriptor. The macro is designed to be used inside of a ResourceTemplate (page 794). Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba 799
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definition 20 events 20 registers 2
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