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:
How to obtain the latest Windows XP service pack
A supported hotfix is 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 software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note
If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note
The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.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
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.
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:
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:
Description of the standard terminology that is used to describe Microsoft software updates