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WMI Libraly > Win32_DMAChannel Class

Win32_DMAChannel Class

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.
Namespace value is root/CIMV2.
WMI Provider value is CIMWin32.


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

  • Availability
  • The Availability property indicates the availability of the DMA.

  • BurstMode
  • Indicate whether the DMA channel supports burst mode

  • ByteMode
  • 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.

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

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

  • CreationClassName
  • 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
  • The scoping computer system's creation class name.

  • CSName
  • The scoping computer system's name.

  • Description
  • The Description property provides a textual description of the object.

  • DMAChannel
  • A part of the object's key value, the DMA channel number.

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

  • Name
  • 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.

  • Port
  • The Port property specifies the DMA port used by the host bus adapter. This is meaningful for MCA-type buses.
    Example: 12

  • Status
  • 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.

  • TransferWidths
  • 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.

  • TypeCTiming
  • 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.

  • WordMode
  • 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.


    Method not found.

    Example WQL

    SELECT * FROM Win32_DMAChannel
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