diff --git a/applications/apertif/designs/apertif_unb1_correlator/tb/vhdl/tb_apertif_unb1_correlator.vhd b/applications/apertif/designs/apertif_unb1_correlator/tb/vhdl/tb_apertif_unb1_correlator.vhd
index 633e438aa549b41700a6f75fe7dc54e38d39546a..cd1f937417372c2822f7b4cf770bb80243d4d4e4 100644
--- a/applications/apertif/designs/apertif_unb1_correlator/tb/vhdl/tb_apertif_unb1_correlator.vhd
+++ b/applications/apertif/designs/apertif_unb1_correlator/tb/vhdl/tb_apertif_unb1_correlator.vhd
@@ -47,13 +47,16 @@ ARCHITECTURE tb OF tb_apertif_unb1_correlator IS
 
   CONSTANT c_cable_delay     : TIME := 12 ns;
   CONSTANT c_eth_clk_period  : TIME := 40 ns;  -- 25 MHz XO on UniBoard
+  CONSTANT c_sa_clk_period   : TIME := 6.4 ns;  
   CONSTANT c_clk_period      : TIME := 5 ns; 
   CONSTANT c_pps_period      : NATURAL := 1000; 
 
+
   -- DUT
   SIGNAL clk                 : STD_LOGIC := '0';
   SIGNAL pps                 : STD_LOGIC := '0';
   SIGNAL pps_rst             : STD_LOGIC := '0';
+  SIGNAL sa_clk              : STD_LOGIC := '1';
 
   SIGNAL WDI                 : STD_LOGIC;
   SIGNAL INTA                : STD_LOGIC;
@@ -69,6 +72,7 @@ ARCHITECTURE tb OF tb_apertif_unb1_correlator IS
 
   SIGNAL sens_scl            : STD_LOGIC;
   SIGNAL sens_sda            : STD_LOGIC;
+  SIGNAL si_fn_0_tx          : STD_LOGIC_VECTOR(c_unb1_board_ci.tr.bus_w-1 DOWNTO 0) := (OTHERS => '0');  
 
 BEGIN
 
@@ -77,6 +81,7 @@ BEGIN
   ----------------------------------------------------------------------------
   clk     <= NOT clk AFTER c_clk_period/2;        -- External clock (200 MHz)
   eth_clk <= NOT eth_clk AFTER c_eth_clk_period/2;  -- Ethernet ref clock (25 MHz)
+  sa_clk  <= NOT sa_clk  AFTER c_sa_clk_period/2;
   
   INTA <= 'H';  -- pull up
   INTB <= 'H';  -- pull up
@@ -117,7 +122,16 @@ BEGIN
       -- 1GbE Control Interface
       ETH_clk     => eth_clk,
       ETH_SGIN    => eth_rxp,
-      ETH_SGOUT   => eth_txp
+      ETH_SGOUT   => eth_txp,
+      
+      -- Transceiver clocks
+      SA_CLK      => sa_clk,  --  : IN  STD_LOGIC; -- SerDes Clock BN-BI / SI_FN
+  
+      -- Serial I/O
+      SI_FN_0_RX  => si_fn_0_tx, --  : IN    STD_LOGIC_VECTOR(c_unb1_board_ci.tr.bus_w-1 DOWNTO 0);
+      SI_FN_1_RX  => si_fn_0_tx, --  : IN    STD_LOGIC_VECTOR(c_unb1_board_ci.tr.bus_w-1 DOWNTO 0);
+      SI_FN_2_RX  => si_fn_0_tx, --  : IN    STD_LOGIC_VECTOR(c_unb1_board_ci.tr.bus_w-1 DOWNTO 0);
+      SI_FN_3_RX  => si_fn_0_tx  --  : IN    STD_LOGIC_VECTOR(c_unb1_board_ci.tr.bus_w-1 DOWNTO 0);
     );
 
 END tb;