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.
RESOLUTION
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 is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows XP service pack that contains this hotfix.
To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:
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.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