USB interrupt mode slower than what is programmed

  sarbezir 14:45 15 Feb 2005

I have programmed a USB device in interrupt mode for 1000 packets per second. But actually I give about 700 packets per second until I execute another copy of program, then the first one becomes 1000 packets per second and the second one becomes 700. Albeit sometimes even this also does not occure.
Some times I run 5 copy of programs and some of them are 1000 and some are 700, and when I re-execute all of programs to have 2 copy of each program then all become 1000.
Why I program the USB for 1000 packets per second in Interrupt mode but give 700 p.p.s some times ? Is the problem for USB IC on the motherboard or for WINDOWS ? I use Windows XP, tested on all service packs, and also tested on Windows Server 2003 ; All had the same problem.

Please answer me or notify me of any answer through
[email protected]

Thanks for any rapid response.

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