diff --git a/libraries/technology/ddr/tech_ddr_pkg.vhd b/libraries/technology/ddr/tech_ddr_pkg.vhd
index 53bf6710ae420869381a7494d22f2f548aff9c5f..7ab2fe199dfec053f51a4609db7f92637815f175 100644
--- a/libraries/technology/ddr/tech_ddr_pkg.vhd
+++ b/libraries/technology/ddr/tech_ddr_pkg.vhd
@@ -99,9 +99,10 @@ PACKAGE tech_ddr_pkg IS
   END RECORD;
   
   TYPE t_tech_ddr4_phy_in IS RECORD                                                                 -- DDR4 Description
-    evt                        : STD_LOGIC;                                                         -- event signal
+    --evt                      : STD_LOGIC;                                                         -- event signal
     alert_n                    : STD_LOGIC;                                                         -- alert signal
     oct_rzqin                  : STD_LOGIC;                                                         -- PHY has On Chip Termination OCT inputs
+    ref_clk                    : STD_LOGIC;                                                         -- reference clock input
   END RECORD;
 
   TYPE t_tech_ddr3_phy_io IS RECORD                                                                 -- DDR3 Description