Decrease buffer to 1024 to save M20K RAM.

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

@@ -86,7 +86,7 @@ package sdp_pkg is
   constant c_sdp_S_sub_bf                  : natural := 488;
   constant c_sdp_R_os                      : natural := 2;  -- Oversampling factor of 2 for PFB.
   constant c_sdp_V_ring_pkt_len_max        : natural := 48;  -- for 16 nodes
-  constant c_sdp_V_sample_delay            : natural := 4096;
+  constant c_sdp_V_sample_delay            : natural := 1024;  -- 1024 uses 12 M20K, 2048 24 M20K and 4096 36 M20K
   constant c_sdp_V_si_db                   : natural := 1024;
   constant c_sdp_V_si_db_large             : natural := 131072;
   constant c_sdp_V_si_histogram            : natural := 512;