On Tuesday 07 April 2009, Grant Likely wrote: > Phy address 0 is the broadcast address. All phys will usually respond > to address 0 accesses. Not all. Some (e.g. LXT971) can be used at this address. But you're correct, it's definitely a bad idea to use 0 as an PHY address. Not sure how the Micrel reacts here. The datasheet could help... Best regards, Stefan