FreeLists / si-list / [SI-LIST] Diff Tight vs Loosely coupled

[Rajan HS <rajan_hs@xxxxxxxxxxx>]

Hi experts,
   
  Could any one throw some light on when would be a differential signal needs 
to be routed as tightly coupled or loosely coupled ? also why does some of the 
differential signals needs to meet both single ended and differential impedance 
requirements ?
   
  thanks in advance
   
  Rajan
                                
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