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Optimize registers usage on xwb_fofb_shaper_filt.vhd #38

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Oct 25, 2024
Merged

Optimize registers usage on xwb_fofb_shaper_filt.vhd #38

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81 changes: 44 additions & 37 deletions hdl/modules/fofb_shaper_filt/xwb_fofb_shaper_filt.vhd
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Original file line number Diff line number Diff line change
Expand Up @@ -139,7 +139,7 @@ ARCHITECTURE behave OF xwb_fofb_shaper_filt IS
(OTHERS => c_WB_FOFB_SHAPER_FILT_REGS_COEFFS_O_IFC_0s);

SIGNAL coeffs : t_fofb_shaper_filt_coeffs(g_CHANNELS-1 DOWNTO 0)(
c_MAX_ABI_BIQUADS-1 DOWNTO 0)(
g_NUM_BIQUADS-1 DOWNTO 0)(
b0(g_COEFF_INT_WIDTH-1 DOWNTO -g_COEFF_FRAC_WIDTH),
b1(g_COEFF_INT_WIDTH-1 DOWNTO -g_COEFF_FRAC_WIDTH),
b2(g_COEFF_INT_WIDTH-1 DOWNTO -g_COEFF_FRAC_WIDTH),
Expand Down Expand Up @@ -187,47 +187,54 @@ BEGIN
-- RAM address 7 + 8*{biquad_idx} = unused
FOR ch IN 0 TO g_CHANNELS-1
LOOP
CASE coeff_idx IS
WHEN 0 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).b0), OTHERS => '0');
WHEN 1 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).b1), OTHERS => '0');
WHEN 2 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).b2), OTHERS => '0');
WHEN 3 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).a1), OTHERS => '0');
WHEN 4 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).a2), OTHERS => '0');
WHEN OTHERS =>
END CASE;
IF biquad_idx < g_NUM_BIQUADS THEN
CASE coeff_idx IS
WHEN 0 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).b0), OTHERS => '0');
WHEN 1 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).b1), OTHERS => '0');
WHEN 2 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).b2), OTHERS => '0');
WHEN 3 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).a1), OTHERS => '0');
WHEN 4 =>
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <=
(to_slv(coeffs(ch)(biquad_idx).a2), OTHERS => '0');
WHEN OTHERS =>
END CASE;
-- If trying to access biquads that aren't instatiated, return zeros
ELSE
wb_fofb_shaper_filt_regs_coeffs_i_ifc_arr(ch).data <= (OTHERS => '0');
END IF;

IF rising_edge(clk_i) THEN
IF rst_n_i = '0' THEN
ELSE
IF wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).wr = '1' THEN
CASE coeff_idx IS
WHEN 0 =>
coeffs(ch)(biquad_idx).b0 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 1 =>
coeffs(ch)(biquad_idx).b1 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 2 =>
coeffs(ch)(biquad_idx).b2 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 3 =>
coeffs(ch)(biquad_idx).a1 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 4 =>
coeffs(ch)(biquad_idx).a2 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN OTHERS =>
END CASE;
IF biquad_idx < g_NUM_BIQUADS THEN
CASE coeff_idx IS
WHEN 0 =>
coeffs(ch)(biquad_idx).b0 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 1 =>
coeffs(ch)(biquad_idx).b1 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 2 =>
coeffs(ch)(biquad_idx).b2 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 3 =>
coeffs(ch)(biquad_idx).a1 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN 4 =>
coeffs(ch)(biquad_idx).a2 <= f_parse_wb_coeff(
wb_fofb_shaper_filt_regs_coeffs_o_ifc_arr(ch).data);
WHEN OTHERS =>
END CASE;
END IF;
END IF;
END IF;
END IF;
Expand Down
24 changes: 12 additions & 12 deletions hdl/testbench/xwb_fofb_shaper_filt/fofb_shaper_filt_coeffs.dat
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,12 +1,12 @@
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
9.26728558e-03 1.85345712e-02 9.26728558e-03 -1.38777878e-16 9.70055654e-03 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.94289029e-16 9.20192105e-02 1.00000000e+00 2.00000000e+00 1.00000000e+00 -1.66533454e-16 2.85702154e-01 1.00000000e+00 2.00000000e+00 1.00000000e+00 -2.22044605e-16 6.73513678e-01 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
6 changes: 6 additions & 0 deletions hdl/testbench/xwb_fofb_shaper_filt/xwb_fofb_shaper_filt_tb.vhd
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,12 @@ BEGIN
-- Read back filter coefficients
read32_pl(clk, wb_slave_i, wb_slave_o, v_wb_addr, v_wb_dat);

-- If trying to access a non-instatiated biquad, the expected return
-- value for the coefficients is 0
IF biquad_idx >= g_NUM_BIQUADS THEN
v_wb_coeff := x"00000000";
END IF;

ASSERT v_wb_dat = v_wb_coeff
REPORT
"UNEXPECTED FILTER COEFFICIENT "
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