Draft node_sdp_transient_buffer.vhd with reg_tbuf and reg_io_ddr_core.

...far2/libraries/sdp/src/vhdl/node_sdp_transient_buffer.vhd

applications/lofar2/libraries/sdp/src/vhdl/sdp_station.vhd

applications/lofar2/libraries/sdp/src/vhdl/sdp_tbuf_pkg.vhd