Libusb-win32 with Xilinx Platform USB Cable II behavior

Hi,

I am using libusb-win32 'on top of' (in addition to) the Xilinx Platform USB
Cable II drivers. This is needed to perform JTAG interface support on a
Gaisler-Aeroflex Sparc Development board. I only use this for a SW JTAG
debugging i/f. I installed the xilinx drivers (together with there minimum
footprint FPGA dev environment - required to get the xilinx drivers to
install and work). I then (per Gaisler instructions / support documents)
installed libusb-win32. This worked perfect just as advertised ... until i
unpluged the usb programmer cable. When i plugged it back in, it seems to
reinstall (per windows 7 device manager), but does NOT work (i get errors
about iniitiazlation issues, or problems with the JTAG chain, etc) or my
gasiler i/f sw (grmon) crashes. I reinstalled libusb and was able to get it
working again, but i could not unplug and then replug the usb programming
cable without ALSO having to reinstall libusb-win32?

i discovered (later) that if i reboot the PC with usb programming cable
plugged in, it seems to resolve the issue? but this is not the most
desireable behavior (limitation). 

any help / opinions / suggestions will be much appreciated!

Thanks,
Dave



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