Added func_tech_ddr_module_size() to determine the module memory size in GBytes.

libraries/technology/ddr/tech_ddr_pkg.vhd

@@ -37,7 +37,7 @@ PACKAGE tech_ddr_pkg IS
     a_col_w                           : NATURAL;  -- = 10    <= a_w, col address width, via a_w lines
     ba_w                              : NATURAL;  -- = 3
     dq_w                              : NATURAL;  -- = 64
-    dqs_w                             : NATURAL;  -- = 8      = dq_w / nof_dq_per_dqs;
+    dqs_w                             : NATURAL;  -- = 8      = dq_w / nof_dq_per_dqs
     dm_w                              : NATURAL;  -- = 8
     cs_w                              : NATURAL;  -- = 2
     clk_w                             : NATURAL;  -- = 2
@@ -56,6 +56,8 @@ PACKAGE tech_ddr_pkg IS
   CONSTANT c_tech_ddr_4g_800m         : t_c_tech_ddr := ( 800,  TRUE,   15, 15, 10, 3, 64, 8, 8, 2, 2,   14,   4, 2, 32, 256, 64, 7);
   CONSTANT c_tech_ddr_4g_800m_slave   : t_c_tech_ddr := ( 800, FALSE,   15, 15, 10, 3, 64, 8, 8, 2, 2,   14,   4, 2, 32, 256, 64, 7);
 
+  FUNCTION func_tech_ddr_module_size(c_ddr : t_c_tech_ddr) RETURN NATURAL;  -- return DDR module size in GByte
+    
   -- PHY in, inout and out signal records
   TYPE t_tech_ddr_phy_in IS RECORD  
     evt                        : STD_LOGIC;                                                          -- event signal is Not Connected to DDR3 PHY
@@ -134,5 +136,16 @@ PACKAGE tech_ddr_pkg IS
 END tech_ddr_pkg;
 
 PACKAGE BODY tech_ddr_pkg IS
+
+  FUNCTION func_tech_ddr_module_size(c_ddr : t_c_tech_ddr) RETURN NATURAL IS
+    CONSTANT c_chip_addr_w        : NATURAL := ceil_log2(c_ddr.cs_w);  -- Chip sel lines converted to logical address
+    CONSTANT c_dq_address_w       : NATURAL := c_chip_addr_w + c_ddr.ba_w + c_ddr.a_w + c_ddr.a_col_w;
+    CONSTANT c_dq_nof_bytes_w     : NATURAL := 8;  -- both dw_q = 64 and 72 are regarded as having 8 bytes (either with 8 or 9 bits per byte)
+    CONSTANT c_module_nof_bytes_w : NATURAL := c_dq_address_w + c_dq_nof_bytes_w;
+    CONSTANT c_1GB_w              : NATURAL := 30;
+  BEGIN
+    RETURN 2**(c_module_nof_bytes_w-c_1GB_w);
+  END;
+  
 END tech_ddr_pkg;