[SI-LIST] why no class-I/II in SSTL_1.8

Hi,
  Are there any ClassI/II type of interfaces in SSTL_1.8. I could see in SSTL_2 
there are class-I and II interfaces for unidirectional and bidirectional 
signalling. 
  For bidirectional interface in SSTL_1.8 are there any current drive 
differences, like in SSTL2, 8.1mA for Class-I and 16.2mA for class-II.
   
  Regards
  Canes
   
       
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