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此文件采用了verilog语言在cpld中怎样实现波形发生器

# Reading C:/Modeltech_6.1b/tcl/vsim/pref.tcl 
# Licensing checkout error with feature vsim-viewer. (Error code -2.)
# The license file is corrupt.  Please verify that
# the file you are specifying is actually the license
# file and that it has not been modified accidentally.
# ** Error: Failure to license for viewer.
# Unable to checkout a viewer license necessary for use of the ModelSim graphical user interface.  Vsim is closing.