diff --git a/libraries/base/ring/src/vhdl/ring_lane_info.vhd b/libraries/base/ring/src/vhdl/ring_lane_info.vhd
new file mode 100644
index 0000000000000000000000000000000000000000..869ce43cb9d03ca03c07c94ca6a22876ade6ff8b
--- /dev/null
+++ b/libraries/base/ring/src/vhdl/ring_lane_info.vhd
@@ -0,0 +1,85 @@
+-------------------------------------------------------------------------------
+--
+-- Copyright 2021
+-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
+-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+-- http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+--
+-- Author: R. van der Walle
+
+-- Purpose:
+-- . Ring lane info register
+-- Description:
+--
+-- Remark:
+-- .
+-------------------------------------------------------------------------------
+
+LIBRARY IEEE, common_lib, mm_lib;
+USE IEEE.STD_LOGIC_1164.ALL;
+USE common_lib.common_pkg.ALL;
+USE common_lib.common_mem_pkg.ALL;
+USE common_lib.common_field_pkg.ALL;
+
+ENTITY ring_lane_info IS
+ PORT (
+ -- Clocks and reset
+ mm_rst : IN STD_LOGIC; -- reset synchronous with mm_clk
+ mm_clk : IN STD_LOGIC; -- memory-mapped bus clock
+
+ dp_clk : IN STD_LOGIC;
+ dp_rst : IN STD_LOGIC;
+
+ reg_mosi : IN t_mem_mosi;
+ reg_miso : OUT t_mem_miso;
+
+ -- inputs from other blocks
+ lane_direction : IN STD_LOGIC;
+
+ -- sdp info
+ lane_info : OUT t_lane_info
+ );
+END ring_lane_info;
+
+
+ARCHITECTURE str OF ring_lane_info IS
+
+ SIGNAL lane_info_ro: t_lane_info; -- ro = read only
+
+BEGIN
+
+ u_mm_fields: ENTITY work.ring_lane_info_reg
+ PORT MAP (
+
+ mm_clk => mm_clk,
+ mm_rst => mm_rst,
+
+ dp_clk => dp_clk,
+ dp_rst => dp_rst,
+
+ reg_mosi => reg_mosi,
+ reg_miso => reg_miso,
+
+ lane_info_ro => lane_info_ro,
+ lane_info => lane_info
+ );
+
+
+ lane_info_ro.lane_direction <= lane_direction;
+
+END str;
diff --git a/libraries/base/ring/src/vhdl/ring_lane_info_reg.vhd b/libraries/base/ring/src/vhdl/ring_lane_info_reg.vhd
new file mode 100644
index 0000000000000000000000000000000000000000..1ed8937b5aafd3907b6feb3131b70d88620d9e74
--- /dev/null
+++ b/libraries/base/ring/src/vhdl/ring_lane_info_reg.vhd
@@ -0,0 +1,110 @@
+-------------------------------------------------------------------------------
+--
+-- Copyright 2021
+-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
+-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+-- http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+--
+-- Author: R. Donker
+
+-- Purpose:
+-- . Ring lane info register
+-- Description:
+--
+-- Remark:
+-- .
+-------------------------------------------------------------------------------
+
+LIBRARY IEEE, common_lib, mm_lib;
+USE IEEE.STD_LOGIC_1164.ALL;
+USE common_lib.common_pkg.ALL;
+USE common_lib.common_mem_pkg.ALL;
+USE common_lib.common_field_pkg.ALL;
+USE work.ring_pkg.ALL;
+
+ENTITY ring_lane_info_reg IS
+ PORT (
+ -- Clocks and reset
+ mm_rst : IN STD_LOGIC; -- reset synchronous with mm_clk
+ mm_clk : IN STD_LOGIC; -- memory-mapped bus clock
+
+ dp_clk : IN STD_LOGIC;
+ dp_rst : IN STD_LOGIC;
+
+ reg_mosi : IN t_mem_mosi;
+ reg_miso : OUT t_mem_miso;
+
+ -- sdp info
+ lane_info_ro : IN t_lane_info; -- ro = read only
+ lane_info : OUT t_lane_info
+ );
+END ring_lane_info_reg;
+
+
+ARCHITECTURE str OF lane_info_reg IS
+
+ SIGNAL mm_fields_in : STD_LOGIC_VECTOR(field_slv_in_len(c_lane_info_field_arr)-1 DOWNTO 0);
+ SIGNAL mm_fields_out : STD_LOGIC_VECTOR(field_slv_out_len(c_lane_info_field_arr)-1 DOWNTO 0);
+
+ SIGNAL lane_info_rd : t_lane_info;
+ SIGNAL lane_info_wr : t_lane_info;
+
+BEGIN
+
+ lane_info <= lane_info_rd;
+
+ p_lane_info_rd : PROCESS(lane_info_wr, lane_info_ro)
+ BEGIN
+ -- default write assign all fields
+ lane_info_rd <= lane_info_wr;
+
+ -- overrule the read only fields
+ lane_info_rd.lane_direction <= lane_info_ro.lane_direction;
+ END PROCESS;
+
+
+ u_mm_fields: ENTITY mm_lib.mm_fields
+ GENERIC MAP(
+ g_use_slv_in_val => FALSE, -- use FALSE to save logic when always slv_in_val='1'
+ g_field_arr => c_lane_info_field_arr
+ )
+ PORT MAP (
+ mm_clk => mm_clk,
+ mm_rst => mm_rst,
+
+ mm_mosi => reg_mosi,
+ mm_miso => reg_miso,
+
+ slv_clk => dp_clk,
+ slv_rst => dp_rst,
+
+ slv_in => mm_fields_in,
+ slv_in_val => '1',
+
+ slv_out => mm_fields_out
+ );
+
+ -- add "RO" fields to mm_fields
+ mm_fields_in(field_hi(c_lane_info_field_arr, "lane_direction") DOWNTO field_lo(c_lane_info_field_arr, "lane_direction")) <= slv(lane_info_rd.lane_direction);
+
+ -- get "RW" fields from mm_fields
+ lane_info_wr.transport_nof_hops <= mm_fields_out(field_hi(c_lane_info_field_arr, "transport_nof_hops") DOWNTO field_lo(c_lane_info_field_arr, "transport_nof_hops"));
+ lane_info_wr.tx_select <= mm_fields_out(field_hi(c_lane_info_field_arr, "tx_select") DOWNTO field_lo(c_lane_info_field_arr, "tx_select"));
+ lane_info_wr.rx_select <= mm_fields_out(field_hi(c_lane_info_field_arr, "rx_select") DOWNTO field_lo(c_lane_info_field_arr, "rx_select"));
+
+END str;
diff --git a/libraries/base/ring/src/vhdl/ring_pkg.vhd b/libraries/base/ring/src/vhdl/ring_pkg.vhd
new file mode 100644
index 0000000000000000000000000000000000000000..c3e01e265639b8e75b3c10f8cd0dc24e44eca613
--- /dev/null
+++ b/libraries/base/ring/src/vhdl/ring_pkg.vhd
@@ -0,0 +1,87 @@
+-------------------------------------------------------------------------------
+--
+-- Copyright 2021
+-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
+-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+-- http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+--
+-- Author: R. van der Walle
+-- Purpose:
+-- . This package contains ring specific constants.
+-- Description:
+-- Remark:
+-------------------------------------------------------------------------------
+LIBRARY ieee, common_lib;
+USE IEEE.std_logic_1164.ALL;
+USE common_lib.common_pkg.ALL;
+USE common_lib.common_mem_pkg.ALL;
+USE common_lib.common_field_pkg.ALL;
+
+PACKAGE sdp_pkg is
+-- lane info, see https://support.astron.nl/confluence/x/jyu7Ag
+-- +====================+========+==============================================================================+===========================+
+-- | Field | Access | Description | Remark |
+-- +====================+========+==============================================================================+===========================+
+-- | transport_nof_hops | RW | Number of hops (N_transport_hops) to transport a packet. The RN will remove | Same setting for all RN |
+-- | | | packets that have traveled N_transport_hops hops. If | |
+-- | | | N_transport_hops >= N_rn, then the ring cannot remove the packet, because | |
+-- | | | then it cannot distinguish between a packet that just starts or that has | |
+-- | | | has already been transported along the entire ring, so then the application | |
+-- | | | has to take care of removing the packet from the ring (or let it cycle along | |
+-- | | | the ring 'forever'). | |
+-- +--------------------+--------+------------------------------------------------------------------------------+---------------------------+
+-- | lane_direction | RO | 1 = transport in positive RN index direction on lanes with even lane index. 0| Same setting for all RN |
+-- | | | = transport in negative RN index direction on lanes with odd lane index. | |
+-- | | | Hence for N_lanes = 8, lanes 0, 2, 4, and 6 will transport in positive | |
+-- | | | direction, and lanes 1, 3, 5, 7 will transport in opposite (= negative) | |
+-- | | | direction. The lane direction is fixed per lane and therefore read only. | |
+-- +--------------------+--------+------------------------------------------------------------------------------+---------------------------+
+-- | tx_select | RW | 0 = transmit via on board port, 1 = transmit via cable (QSFP) port. Default | Individual setting per RN |
+-- | | | in firmware assume cable between RN on different UniBoard2 and assume cable | |
+-- | | | to close the ring defined by ring_info. The programmable tx_select allows | |
+-- | | | using cables between other RN in the ring. | |
+-- +--------------------+--------+------------------------------------------------------------------------------+---------------------------+
+-- | rx_select | RW | 0 = receive via on board port, 1 = receive via cable (QSFP) port. Default in | Individual setting per RN |
+-- | | | firmware assume cable between RN on different UniBoard2 and assume cable to | |
+-- | | | close the ring defined by ring_info. The programmable rx_select allows using | |
+-- | | | cables between other RN in the ring. | |
+-- +--------------------+--------+------------------------------------------------------------------------------+---------------------------+
+
+ TYPE t_lane_info IS RECORD
+ transport_nof_hops : STD_LOGIC_VECTOR(c_word_w-1 DOWNTO 0);
+ lane_direction : STD_LOGIC;
+ tx_select : STD_LOGIC;
+ rx_select : STD_LOGIC;
+ END RECORD;
+
+ CONSTANT c_lane_info_rst : t_lane_info :=
+ ( (OTHERS => '0'), '0', '0', '0' );
+
+ CONSTANT c_lane_info_field_arr : t_common_field_arr(3 DOWNTO 0) :=
+ ( (field_name_pad("transport_nof_hops"), "RW", 32, field_default(0)),
+ (field_name_pad("lane_direction"), "RO", 1, field_default(0)),
+ (field_name_pad("tx_select"), "RW", 1, field_default(0)),
+ (field_name_pad("rx_select"), "RW", 1, field_default(0)) );
+
+ END PACKAGE sdp_pkg;
+
+PACKAGE BODY sdp_pkg IS
+
+
+END sdp_pkg;
+