rx_link4x_o(0) <= "0000";  -- 0
                      -- 1
rx_link4x_o(2) <= "0000";  -- 2
rx_link4x_o(3) <= "0000";  -- 3
                      -- 4
rx_link4x_o(5) <= "0000"; -- 5
rx_link4x_o(6) <= "0000"; -- 6
                      -- 7
rx_link4x_o(8) <= "0000"; -- 8
rx_link4x_o(9) <= "0000"; -- 9
                      --10
rx_link4x_o(11) <= "0000"; --11
rx_link4x_o(12) <= "0000"; --12
rx_link4x_o(13) <= "0000"; --13
rx_link4x_o(14) <= "0000"; --14
                      --15