SSTL-15

Hello everyone,

     I get a problem about SSTL-15 interface circuit.As it's established by JEDEC,I search for this standard in JEDEC.But what I get are SSTL-2 and SSTL-18.They are working for DDR1 and DDR2.There is no SSTL-15 in JEDEC.So I need your help !
Best regards

Lich_Wang