diff options
Diffstat (limited to 'usrp2')
| -rw-r--r-- | usrp2/sdr_lib/dsp_core_rx.v | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/usrp2/sdr_lib/dsp_core_rx.v b/usrp2/sdr_lib/dsp_core_rx.v index 19215c777..ac8fbc6eb 100644 --- a/usrp2/sdr_lib/dsp_core_rx.v +++ b/usrp2/sdr_lib/dsp_core_rx.v @@ -35,7 +35,8 @@ module dsp_core_rx reg [31:0] phase; wire [35:0] prod_i, prod_q; - wire [23:0] i_cordic, q_cordic; + wire [24:0] i_cordic, q_cordic; + wire [23:0] i_cordic_clip, q_cordic_clip; wire [23:0] i_cic, q_cic; wire [17:0] i_cic_scaled, q_cic_scaled; wire [17:0] i_hb1, q_hb1; @@ -85,23 +86,26 @@ module dsp_core_rx else phase <= phase + phase_inc; - cordic_z24 #(.bitwidth(24)) + cordic_z24 #(.bitwidth(25)) cordic(.clock(clk), .reset(rst), .enable(run), - .xi({adc_i_mux,6'd0}),. yi({adc_q_mux,6'd0}), .zi(phase[31:8]), + .xi({adc_i_mux[17],adc_i_mux,6'd0}),. yi({adc_q_mux[17],adc_q_mux,6'd0}), .zi(phase[31:8]), .xo(i_cordic),.yo(q_cordic),.zo() ); + clip_reg #(.bits_in(25), .bits_out(24)) clip_i (.clk(clk), .in(i_cordic), .out(i_cordic_clip)); + clip_reg #(.bits_in(25), .bits_out(24)) clip_q (.clk(clk), .in(q_cordic), .out(q_cordic_clip)); + cic_strober cic_strober(.clock(clk),.reset(rst),.enable(run),.rate(cic_decim_rate), .strobe_fast(1),.strobe_slow(strobe_cic) ); cic_decim #(.bw(24)) decim_i (.clock(clk),.reset(rst),.enable(run), .rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic), - .signal_in(i_cordic),.signal_out(i_cic)); + .signal_in(i_cordic_clip),.signal_out(i_cic)); cic_decim #(.bw(24)) decim_q (.clock(clk),.reset(rst),.enable(run), .rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic), - .signal_in(q_cordic),.signal_out(q_cic)); + .signal_in(q_cordic_clip),.signal_out(q_cic)); wire strobe_cic_d1; round_sd #(.WIDTH_IN(24),.WIDTH_OUT(18)) round_icic |