IDT74SSTU32864D can be configured into 3 Device Modes namely the 1:2 14-bit to
28-bit Type A and Type B modes and 1:1 25-bit to 25-bit Type C mode

This zip file contains IBIS models for TYPE A, B, and C modes with output load 
treated just as a discrete RC load and as a transmission line plus discrete 
RC load. 

When treated as a transmission line plus discrete RC load, the output model was
created with the output load treated as part of the output circuit with nominal
10 Gig load treated as an external load. 

The IBIS file each output load are as follows

Discrete RC Load
----------------
4pw864dy_ab_n.ibs

Transmission line plus Discrete RC Load
---------------------------------------
4pw864dy_ab_t.ibs

Discrete RC Load
----------------
4pw864dy_c_n.ibs

Transmission line plus Discrete RC Load
---------------------------------------
4pw864dy_c_t.ibs