The IBUFDS_DIFF_OUT_INTERMDISABLE primitive shown in the following figure is available in the HD I/O banks. It has complementary differential outputs and an INTERMDISABLE port that can be used to manually disable the optional on-die receiver termination features (uncalibrated). See Uncalibrated Input Termination in HP and HD I/O Banks for more details.
Figure 1. Differential Input Buffer with Complementary Outputs, Input
Path Disable, and On-Die Input Termination Disable
(IBUFDS_DIFF_OUT_INTERMDISABLE)
If the I/O is using any on-die receiver termination features (uncalibrated), this primitive disables the termination legs whenever the INTERMDISABLE signal is asserted High.