diff --git a/libraries/base/dp/tb/vhdl/tb_dp_bsn_sync_interval.vhd b/libraries/base/dp/tb/vhdl/tb_dp_bsn_sync_interval.vhd
index 7d44e0bea5ed09d1207417ac662ad38268edde1e..0e976dc16e0f0cf91c572b36a38b8e7030bf46ed 100644
--- a/libraries/base/dp/tb/vhdl/tb_dp_bsn_sync_interval.vhd
+++ b/libraries/base/dp/tb/vhdl/tb_dp_bsn_sync_interval.vhd
@@ -114,7 +114,7 @@ ARCHITECTURE tb OF tb_dp_bsn_sync_interval IS
   SIGNAL ctrl_enable           : STD_LOGIC := '0';
   SIGNAL ctrl_enable_evt       : STD_LOGIC := '0';
   SIGNAL ctrl_interval_size    : NATURAL := c_nof_samples_per_output_sync;
-  SIGNAL ctrl_start_bsn        : STD_LOGIC_VECTOR(c_bsn_w-1 DOWNTO 0);
+  SIGNAL ctrl_start_bsn        : STD_LOGIC_VECTOR(c_bsn_w-1 DOWNTO 0) := (OTHERS=>'0');
   SIGNAL mon_input_current_bsn : STD_LOGIC_VECTOR(c_bsn_w-1 DOWNTO 0);
   SIGNAL mon_input_bsn_at_sync : STD_LOGIC_VECTOR(c_bsn_w-1 DOWNTO 0);
   SIGNAL mon_output_enable     : STD_LOGIC;
@@ -146,10 +146,15 @@ ARCHITECTURE tb OF tb_dp_bsn_sync_interval IS
   SIGNAL pending_out_disable   : STD_LOGIC := '0';
   SIGNAL expected_out_enable   : STD_LOGIC := '0';
   SIGNAL expecting_out_start   : STD_LOGIC := '0';
-  SIGNAL dbg_nof_blk           : NATURAL   := 0;
-  SIGNAL dbg_extra             : NATURAL   := 0;
-  SIGNAL dbg_expected_bsn      : NATURAL   := 0;
 
+  SIGNAL dbg_out_sosi_sync     : STD_LOGIC;
+  SIGNAL dbg_out_sosi_sop      : STD_LOGIC;
+  SIGNAL dbg_out_sosi_bsn      : NATURAL;
+  SIGNAL dbg_expected_bsn      : NATURAL := 0;
+  SIGNAL dbg_nof_blk           : NATURAL := 0;
+  SIGNAL dbg_extra             : NATURAL := 0;
+
+  -- Local procedures
   PROCEDURE proc_output_enable(SIGNAL clk                   : IN STD_LOGIC;
                                SIGNAL cnt                   : IN INTEGER;
                                SIGNAL mon_input_bsn_at_sync : IN STD_LOGIC_VECTOR(c_bsn_w-1 DOWNTO 0);
@@ -438,6 +443,10 @@ BEGIN
                               dbg_extra,
                               dbg_expected_bsn);
 
+  dbg_out_sosi_sync <= out_sosi.sync;
+  dbg_out_sosi_sop  <= out_sosi.sop;
+  dbg_out_sosi_bsn  <= TO_UINT(out_sosi.bsn);
+
   -----------------------------------------------------------------------------
   -- . Verify mon_output_sync_bsn
   -----------------------------------------------------------------------------