Hi, we have a task which requires downloading a file to a embedded device over USB. The transfer type is bulk and take can take several seconds. The device receiving requires a un interrupted download.

On System computer A I can download and operate the device, on
computer system B I can download but not control the device. If I download from system A, then switch to system B I can control the device system.


The type of failure is repeatable when downloading from system B. Both host system are identical hardware/software wise and were purchased at the same time. We also tried a new computer system same results.

I believe that the USB transfer may be interrupted using computer system B, causing the download to become corrupted.

The file were downloading is firmware to a dsp, The USB protocol handle by a cyc68013 (Fx2). With a 8051 core.

I checked the drivers for the device and Xp, they are the same for both computer. I tested system B in safe mode, same results


Could system B have a process which would interrupt the transfer? If so How to determine which one? Any Ideals?

thanks spencer