There is only one PERST# pin ( pin_perst_n) on the R-tile. Therefore, toggling pin_perst_n will affect the entire R-tile. This pin also resets the EMIB interface. If the R-tile x16 port is bifurcated into multiple ports, toggling pin_perst_n will affect all the ports . To reset each port individually, use the pin_perst_n in conjunction with the individual lane resets (lnX_pipe_direct_pld_pcs_rst_n_i).
The lnX_pipe_direct_pld_pcs_rst_n_i signals reset the per-lane TX/RX interfaces.
In PIPE mode, the per-lane lnX_pipe_direct_pld_pcs_rst_n_i signals must be gated by the per-lane lnX_pipe_direct_tx_transfer_en_o signal.
For more details, refer to PIPE Direct Mode.