IBIS model included differential value for AM3505

Hi.
My customer needs the IBIS model included differential value for AM3505,
because the current IBIS model; sprm451.ibs does not include the differential value.

Can TI provide the IBIS model included differential value ?

If not, the vdiff value is "Vinh - Vinl =  xxx mV" for Input,
and the vdiff value  is "0mV" for output.
Is my understanding right? 

[Example]
[Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max
 A13         B13      0         0                NA             NA

Any comments would be appreciated.

Regards,

Kanae