22/09/2008 : V1.0  - Initial release
24/11/2008 : v1.1  - spwr_ip.vhd can compile below quartus6.1 and Precision RTL Synthesis 2005 	
09/01/2009 : v1.2  - First release with report of conformance tester.
06/04/2009 : v1.3  - Improvement of component Tx.(shutdown and start-up link)
		     All inout or buffer is removed.
		     Component Tx can to send an EEP code.
		      