Microsoft KB Archive/819109

= FIX: Isochronous packets incorrectly end up in asynchronous packets =

Article ID: 819109

Article Last Modified on 10/25/2005

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows XP Professional

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SYMPTOMS
Certain NEC 1394 host controllers have a hardware limitation that causes asychronous direct memory access (DMA) corruption when isochronous streaming occurs.



CAUSE
When isochronous streaming occurs on a NEC 1394 controller, an isochronous packet can occasionally end up in an asynchronous DMA request/response packet.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
No prerequisites are required.

Restart requirement
You do not have to restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Windows 2000
 Date        Time   Version        Size    File name ---  21-May-2003  00:38  5.0.2195.6747  37,872  Ohci1394.sys 15-Jan-2003 19:46  5.0.2195.6655  22,064  Sonydcam.sys

Windows XP Service Pack 1 (SP1)
 Date        Time   Version       Size    File name --  12-Jun-2003  17:55  5.1.2600.115  55,680  Ohci1394.sys

Windows XP SP2
 Date        Time   Version        Size    File name ---  12-Jun-2003  17:38  5.1.2600.1234  55,808  Ohci1394.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.

This problem was first corrected in Microsoft Windows XP Service Pack 2.



MORE INFORMATION
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbtshoot kbbug kbfix kbqfe kbwinxpsp2fix kbwinxppresp2fix kbwin2000presp5fix kbwinserv2003presp1fix kbhotfixserver KB819109

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