Use 2147483647 instead of 2*31 - 1 to avoid Modelsim NATURAL overflow warning.

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

@@ -114,7 +114,7 @@ PACKAGE sdp_pkg is
   CONSTANT c_sdp_wg_subband_freq_unit    : REAL := c_diag_wg_freq_unit/REAL(c_sdp_N_fft);  -- subband freq = Fs/1024 = 200 MSps/1024 = 195312.5 Hz sinus
   CONSTANT c_sdp_N_clk_per_sync          : NATURAL := c_sdp_f_adc_MHz*10**6;  -- Default 200M clock cycles per second
   CONSTANT c_sdp_N_clk_sync_timeout      : NATURAL := c_sdp_f_adc_MHz*10**6 + c_sdp_f_adc_MHz*10**5;  -- 10% margin.
-  CONSTANT c_sdp_N_clk_sync_timeout_xsub : NATURAL := 2**31 - 1;  -- 10.7 seconds = largest value for NATURAL.
+  CONSTANT c_sdp_N_clk_sync_timeout_xsub : NATURAL := 2147483647;  -- = 2**31 - 1 = largest value for NATURAL for 10.7 seconds. Do not use 2*31 to avoid Modelsim NATURAL overflow warning.
   CONSTANT c_sdp_N_sync_jesd             : NATURAL := c_sdp_S_pn * c_sdp_N_sync_rcu / c_sdp_S_rcu; -- = 4, nof JESD IP sync outputs per PN
   CONSTANT c_sdp_f_sub_Hz                : REAL := REAL(c_sdp_f_adc_MHz * 10**6) / REAL(c_sdp_N_fft);
   CONSTANT c_sdp_N_int                   : NATURAL := c_sdp_f_adc_MHz * 10**6;  -- nof ADC sample periods per 1 s integration interval
@@ -494,6 +494,8 @@ PACKAGE sdp_pkg is
     step       : NATURAL;
   END RECORD;
 
+  CONSTANT c_sdp_crosslets_info_rst : t_sdp_crosslets_info := (offset_arr => (OTHERS => 0), step => 0);
+
   CONSTANT c_sdp_mm_reg_nof_crosslets  : t_c_mem := (latency  => 1,
                                                      adr_w    => 1,
                                                      dat_w    => ceil_log2(c_sdp_N_crosslets_max+1),