Microsoft KB Archive/837371

= High-speed periodic USB isochronous transfers with periods of 2 or 4 do not work correctly =

Article ID: 837371

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
During isochronous transfers, isochronous endpoints that specify the following periods work correctly:
 * 1 (one transfer every microframe)
 * 8 (one transfer every eight microframes)

However, isochronous endpoints that specify the following periods do not work correctly:
 * 2 (one transfer every two microframes)
 * 4 (one transfer every four microframes)

Isochronous transfers with these endpoints may not be completed successfully, or may complete with incorrect data.



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. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

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

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.   Date         Time   Version        Size     File name ---  10-Jan-2004  12:25  5.1.2600.1331    5,632  Hccoin.dll 10-Jan-2004 12:26  5.1.2600.1331   30,464  Usbccgp.sys 02-Mar-2004 01:40  5.1.2600.1359   25,216  Usbehci.sys 10-Jan-2004 12:26  5.1.2600.1331   53,120  Usbhub.sys 10-Jan-2004 12:26  5.1.2600.1331   16,000  Usbohci.sys 10-Jan-2004 12:26  5.1.2600.1331  138,752  Usbport.sys 10-Jan-2004 12:26  5.1.2600.1331   19,328  Usbuhci.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Microsoft Windows XP Service Pack 2.



MORE INFORMATION
For additional information about the USB 1.1 and 2.0 update for Windows XP SP1, click the following article number to view the article in the Microsoft Knowledge Base:

822603 Availability of the Windows XP S about the USB 1.1 and 2.0 update for Windows XP SP1 USB 1.1 and 2.0 update

For additional information about the terminology that is used in this article, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbhotfixserver kbqfe kbwinxpsp2fix kbqfe kbwinxppresp2fix kbfix kbbug KB837371

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