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对usb设备控制的ip核进行了重新设计并进一步优化

# Reading C:/Modeltech_6.1f/tcl/vsim/pref.tcl 
# ** Error: License checkout has been disallowed because
# only one session is allowed to run on an uncounted nodelock
# license and an instance of ModelSim is already running with a
# nodelocked license on this machine
# Unable to checkout a viewer license necessary for use of the ModelSim graphical user interface.  Vsim is closing.