Clarified word_align field.

applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd

@@ -187,7 +187,7 @@ PACKAGE sdp_pkg is
   CONSTANT c_sdp_stat_ip_dst_addr       : STD_LOGIC_VECTOR(31 DOWNTO 0) := x"0A6300FE";  -- 0A6300FE = '10.99.0.254' = DOP36-enp2s0
   CONSTANT c_sdp_stat_ip_src_addr_31_16 : STD_LOGIC_VECTOR(15 DOWNTO 0) := x"0A63";    -- 10.99.xx.yy
   CONSTANT c_sdp_stat_udp_dst_port      : STD_LOGIC_VECTOR(15 DOWNTO 0) := TO_UVEC(5001, 16);
-  CONSTANT c_sdp_sst_udp_src_port_15_8  : STD_LOGIC_VECTOR( 7 DOWNTO 0) := x"D0";  -- TBC
+  CONSTANT c_sdp_sst_udp_src_port_15_8  : STD_LOGIC_VECTOR( 7 DOWNTO 0) := x"D0";  -- TBC, 7:0 = gn_id (= ID[7:0] = backplane[5:0] & node[1:0])
   CONSTANT c_sdp_bst_udp_src_port_15_8  : STD_LOGIC_VECTOR( 7 DOWNTO 0) := x"D1";  -- TBC
   CONSTANT c_sdp_xst_udp_src_port_15_8  : STD_LOGIC_VECTOR( 7 DOWNTO 0) := x"D2";  -- TBC
 
@@ -198,7 +198,7 @@ PACKAGE sdp_pkg is
 --CONSTANT c_sdp_stat_hdr_field_sel     : STD_LOGIC_VECTOR(c_sdp_stat_nof_hdr_fields-1 DOWNTO 0) := "0"&"100"&"000000010001"&"0100"&"0100"&"000000010"&"1000000"&"0";  -- 0=data path, 1=MM controlled TODO
 
   CONSTANT c_sdp_stat_hdr_field_arr : t_common_field_arr(c_sdp_stat_nof_hdr_fields-1 DOWNTO 0) := (
-      ( field_name_pad("word_align"                              ), "RW", 16, field_default(0) ),
+      ( field_name_pad("word_align"                              ), "RW", 16, field_default(0) ),  -- Tx TSE IP will strip these 2 padding bytes
       ( field_name_pad("eth_dst_mac"                             ), "RW", 48, field_default(c_sdp_stat_eth_dst_mac) ),
       ( field_name_pad("eth_src_mac"                             ), "RW", 48, field_default(0) ),
       ( field_name_pad("eth_type"                                ), "RW", 16, field_default(x"0800") ),
@@ -301,7 +301,7 @@ PACKAGE sdp_pkg is
   CONSTANT c_sdp_cep_ip_total_length   : STD_LOGIC_VECTOR(15 DOWNTO 0) := TO_UVEC(7868, 16);  -- see ICD STAT-CEP
   CONSTANT c_sdp_cep_udp_total_length  : STD_LOGIC_VECTOR(15 DOWNTO 0) := TO_UVEC(7848, 16);  -- see ICD STAT-CEP
   CONSTANT c_sdp_cep_udp_dst_port      : STD_LOGIC_VECTOR(15 DOWNTO 0) := TO_UVEC(5000, 16);
-  CONSTANT c_sdp_cep_udp_src_port_15_8 : STD_LOGIC_VECTOR(7 DOWNTO 0)  := x"D0";        -- 15:8, 7:0 = gn_id (= ID[7:0] = backplane[5:0] & node[1:0])
+  CONSTANT c_sdp_cep_udp_src_port_15_8 : STD_LOGIC_VECTOR( 7 DOWNTO 0) := x"D0";        -- 15:8, 7:0 = gn_id (= ID[7:0] = backplane[5:0] & node[1:0])
 
   CONSTANT c_sdp_cep_app_header_len    : NATURAL := 32;