diff --git a/libraries/base/diag/src/vhdl/diag_pkg.vhd b/libraries/base/diag/src/vhdl/diag_pkg.vhd
index 39cd81d6ccdabd6b821cfce7af4618b5b8aa6809..e0a6ac4f122bfa0f08410394890257945499fb23 100644
--- a/libraries/base/diag/src/vhdl/diag_pkg.vhd
+++ b/libraries/base/diag/src/vhdl/diag_pkg.vhd
@@ -158,7 +158,13 @@ PACKAGE diag_pkg IS
     e_real,
     e_imag
   );        
-  
+
+  -----------------------------------------------------------------------------
+  -- Data buffer dev
+  -----------------------------------------------------------------------------
+  CONSTANT c_diag_db_dev_reg_nof_dat : NATURAL := 8;
+  CONSTANT c_diag_db_dev_reg_adr_w   : NATURAL := ceil_log2(c_diag_db_dev_reg_nof_dat);
+ 
   -----------------------------------------------------------------------------
   -- CNTR / PSRG sequence test data
   -----------------------------------------------------------------------------