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	new file:   checker.sv - changed class name because won't compile. checker_
	new file:   monitor.sv - moved endclass to end, added empty function push_back()
	new file:   stimulus.sv - multiple changes.  added function to drive a command byte,
				added function to write a register using the drive_byte function.
	modified:   top.sv - multiple changes. added monitor and checker instantiation.  added freq_det
				instantiations.  added function to display internal registers (white box).