Added missing fil_backoff_w to t_wpfb local c_wpfb constant definition.

applications/apertif/designs/apertif_unb1_correlator/src/vhdl/apertif_unb1_correlator.vhd

@@ -178,6 +178,7 @@ ARCHITECTURE str OF apertif_unb1_correlator IS
   CONSTANT c_wpfb_nof_points            : NATURAL := 64;                   -- = 1024, N point FFT
   CONSTANT c_wpfb_nof_taps              : NATURAL := 8;                    -- = 8 nof taps n the filter
   CONSTANT c_wpfb_coef_w                : NATURAL := 9;                    --FIXME: 9b does not work; needs updated coefficient files.
+  CONSTANT c_wpfb_in_backoff_w          : natural := 0;                    -- = 0, number of bits for input backoff to avoid output overflow
   CONSTANT c_wpfb_in_dat_w              : NATURAL := 8;                    --FIXME: should be 6b at some point
   CONSTANT c_wpfb_fft_in_dat_w          : NATURAL := sel_a_b(c_use_prefilter, 16, 8);  
   CONSTANT c_wpfb_out_dat_w             : NATURAL := 12;                   --FIXME: Could be wider but is currently 9b to avoid the need for quantization: 9b -> mult -> 18b -> accu -> 32b at the corr output.
@@ -188,7 +189,7 @@ ARCHITECTURE str OF apertif_unb1_correlator IS
   CONSTANT c_wpfb_use_fft_shift         : BOOLEAN := FALSE;
 
   CONSTANT c_wpfb : t_wpfb  := (c_wpfb_wb_factor, c_wpfb_nof_points, c_wpfb_nof_chan, c_wpfb_nof_wb_streams,
-                                c_wpfb_nof_taps, c_wpfb_in_dat_w, 16, c_wpfb_coef_w,
+                                c_wpfb_nof_taps, c_wpfb_in_backoff_w, c_wpfb_in_dat_w, 16, c_wpfb_coef_w,
                                 c_wpfb_use_reorder, c_wpfb_use_fft_shift, c_wpfb_use_separate, c_wpfb_fft_in_dat_w, c_wpfb_out_dat_w, c_wpfb_out_gain_w, 18, 2, true, 56, 2,
                                 c_fft_pipeline, c_fft_pipeline, c_fil_ppf_pipeline);
 --  type t_wpfb is record  
@@ -200,6 +201,7 @@ ARCHITECTURE str OF apertif_unb1_correlator IS
 --    
 --    -- Parameters for the poly phase filter
 --    nof_taps          : natural;        -- = 16, the number of FIR taps per subband
+--    fil_backoff_w     : natural;        -- = 0, number of bits for input backoff to avoid output overflow
 --    fil_in_dat_w      : natural;        -- = 8, number of input bits
 --    fil_out_dat_w     : natural;        -- = 16, number of output bits
 --    coef_dat_w        : natural;        -- = 16, data width of the FIR coefficients

applications/apertif/designs/apertif_unb1_correlator/src/vhdl/node_apertif_unb1_correlator_processing.vhd

@@ -155,6 +155,7 @@ ARCHITECTURE str OF node_apertif_unb1_correlator_processing IS
   CONSTANT c_wpfb_nof_points            : NATURAL := c_nof_channels;                   -- = 1024, N point FFT
   CONSTANT c_wpfb_nof_taps              : NATURAL := 8;                    -- = 8 nof taps n the filter
   CONSTANT c_wpfb_coef_w                : NATURAL := 9;                    --FIXME: 9b does not work; needs updated coefficient files.
+  CONSTANT c_wpfb_in_backoff_w          : natural := 0;                    -- = 0, number of bits for input backoff to avoid output overflow
   CONSTANT c_wpfb_in_dat_w              : NATURAL := 8;                    --FIXME: In simulation there are 6bit values used in the BG.
   CONSTANT c_wpfb_fft_in_dat_w          : NATURAL := sel_a_b(c_use_prefilter, 16, 8);
   CONSTANT c_wpfb_out_dat_w             : NATURAL := 12;                   --FIXME: Could be wider but is currently 9b to avoid the need for quantization: 9b -> mult -> 18b -> accu -> 32b at the corr output.
@@ -165,7 +166,7 @@ ARCHITECTURE str OF node_apertif_unb1_correlator_processing IS
   CONSTANT c_wpfb_use_fft_shift         : BOOLEAN := FALSE;
 
   CONSTANT c_wpfb : t_wpfb  := (c_wpfb_wb_factor, c_wpfb_nof_points, c_wpfb_nof_chan, c_wpfb_nof_wb_streams,
-                                c_wpfb_nof_taps, c_wpfb_in_dat_w, 16, c_wpfb_coef_w,
+                                c_wpfb_nof_taps, c_wpfb_in_backoff_w, c_wpfb_in_dat_w, 16, c_wpfb_coef_w,
                                 c_wpfb_use_reorder, c_wpfb_use_fft_shift, c_wpfb_use_separate, c_wpfb_fft_in_dat_w, c_wpfb_out_dat_w, c_wpfb_out_gain_w, 18, 2, true, 56, 2,
                                 c_fft_pipeline, c_fft_pipeline, c_fil_ppf_pipeline);
 --  type t_wpfb is record  
@@ -177,6 +178,7 @@ ARCHITECTURE str OF node_apertif_unb1_correlator_processing IS
 --    
 --    -- Parameters for the poly phase filter
 --    nof_taps          : natural;        -- = 16, the number of FIR taps per subband
+--    fil_backoff_w     : natural;        -- = 0, number of bits for input backoff to avoid output overflow
 --    fil_in_dat_w      : natural;        -- = 8, number of input bits
 --    fil_out_dat_w     : natural;        -- = 16, number of output bits
 --    coef_dat_w        : natural;        -- = 16, data width of the FIR coefficients