Win32_DMAChannel

The Win32_DMAChannel class represents a direct memory access (DMA) channel on a Win32 computer system. DMA is a method of moving data from a device to memory (or vice versa) without the help of the microprocessor. The system board uses a DMA controller to handle a fixed number of channels, each of which can be used by one (and only one) device at a time.

Quick Start

Properties

In this WMI class, all WMI properties are read-only. You can only read values but not change them.

AddressSize

Data type UInt16

An integer indicating the DMA channel address size in bits. Permissible values are 8, 16, 32 or 64 bits. If unknown, enter 0.

$AddressSize_ReturnValue = 
@{
    0=
    8='(unknown)'
   16='(unknown)'
   32='(unknown)'
   64='(unknown)'
}

Availability

Data type UInt16

The Availability property indicates the availability of the DMA.

$Availability_ReturnValue = 
@{
    1='Other'
    2='Unknown'
    3='Available'
    4='In Use/Not Available'
    5='In Use and Available/Shareable'
}

BurstMode

Data type Boolean

Indicate whether the DMA channel supports burst mode

ByteMode

Data type UInt16

Indicates whether DMA may execute in ‘count by byte’ mode (value=4) or not (value=3). Also, “Other” (1) and “Unknown” (2) may be defined.

$ByteMode_ReturnValue = 
@{
    1='Other'
    2='Unknown'
    3='Not execute in 'count by byte' mode'
    4='Execute in 'count by byte' mode'
}

Caption

Data type String

The Caption property is a short textual description (one-line string) of the object.

ChannelTiming

Data type UInt16

DMA channel timing. For example, “Type A” (value =4) or “Type F” (6) could be specified.

$ChannelTiming_ReturnValue = 
@{
    1='Other'
    2='Unknown'
    3='ISA Compatible'
    4='Type A'
    5='Type B'
    6='Type F'
}

CreationClassName

Data type String

CreationClassName indicates the name of the class or the subclass used in the creation of an instance. When used with the other key properties of this class, this property allows all instances of this class and its subclasses to be uniquely identified.

CSCreationClassName

Data type String

The scoping computer system’s creation class name.

CSName

Data type String

The scoping computer system’s name.

Description

Data type String

The Description property provides a textual description of the object.

DMAChannel

Data type UInt32

A part of the object’s key value, the DMA channel number.

InstallDate

Data type DateTime

The InstallDate property is datetime value indicating when the object was installed. A lack of a value does not indicate that the object is not installed.

MaxTransferSize

Data type UInt32

The maximum number of bytes that can be transferred by this DMA channel. If unknown, enter 0.

Name

Data type String

The Name property defines the label by which the object is known. When subclassed, the Name property can be overridden to be a Key property.

Option

Data type UInt32

The Option input parameter specifies the actual security permission to be modified. Change_Owner_Security_Information – Change the owner of the logical file. Change_Group_Security_Information – Change the group of the logical file. Change_Dacl_Security_Information – Change the Access Control List of the logical file. Change_Sacl_Security_Information – Change the System Access Control List of the logical file.

$Change_Owner_Security_Information=1
$Change_Group_Security_Information=2
$Change_Dacl_Security_Information=4
$Change_Sacl_Security_Information=8

$Option = $Change_Group_Security_Information + $Change_Owner_Security_Information

Port

Data type UInt32

The Port property specifies the DMA port used by the host bus adapter. This is meaningful for MCA-type buses.

Example: 12

Recursive

Data type Boolean

The Recursive input parameter is a boolean that indicates whether the security permissions will be applied recursively to files and directories within the directory specified by the CIM_LogicalFile instance.Note for file instances the Recursive input parameter is ignored.

SecurityDescriptor

Data type Object

The SecurityDescriptor input parameter specifies the security information.

StartFileName

Data type String

The StartFileName input parameter is a string representing the child file/directory to use as a starting point for ChangeSecurityPermissionsEx.The StartFileName property typically, is the StopFileName parameter specifying the file or directory at which anerror occurred from the previous method call. If this parameter is NULL, the operation is performed on the file ordirectory specified in the ExecMethod call.

Status

Data type String

The Status property is a string indicating the current status of the object. Various operational and non-operational statuses can be defined. Operational statuses are “OK”, “Degraded” and “Pred Fail”. “Pred Fail” indicates that an element may be functioning properly but predicting a failure in the near future. An example is a SMART-enabled hard drive. Non-operational statuses can also be specified. These are “Error”, “Starting”, “Stopping” and “Service”. The latter, “Service”, could apply during mirror-resilvering of a disk, reload of a user permissions list, or other administrative work. Not all such work is on-line, yet the managed element is neither “OK” nor in one of the other states.

'OK','Error','Degraded','Unknown','Pred Fail','Starting','Stopping','Service','Stressed','NonRecover','No Contact','Lost Comm'

TransferWidths

Data type UInt16

An array indicating all the transfer widths (in bits) supported by this DMA Channel. Permissible values are 8, 16, 32, 64 or 128 bits. If unknown, enter 0.

$TransferWidths_ReturnValue = 
@{
    0=
    8='(unknown)'
   16='(unknown)'
   32='(unknown)'
   64='(unknown)'
  128='(unknown)'
}

TypeCTiming

Data type UInt16

Indicates whether C type (burst) timing is supported (value=5) or not (value=4). Also, “Other” (1), “Unknown” (2) and “ISA Compatible” (3) are defined.

$TypeCTiming_ReturnValue = 
@{
    1='Other'
    2='Unknown'
    3='ISA Compatible'
    4='Not Supported'
    5='Supported'
}

WordMode

Data type UInt16

Indicates whether DMA may execute in ‘count by word’ mode (value=4) or not (value=3). Also, “Other” (1) and “Unknown” (2) may be defined.

$WordMode_ReturnValue = 
@{
    1='Other'
    2='Unknown'
    3='Not execute in 'count by word' mode'
    4='Execute in 'count by word' mode'
}

Methods

Examples

Help and Questions

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Content last updated: 2013-12-27 12:21:59 (UTC).

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