diff options
Diffstat (limited to 'fpga/usrp3/lib/dsp/ddc_chain.v')
| -rw-r--r-- | fpga/usrp3/lib/dsp/ddc_chain.v | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/fpga/usrp3/lib/dsp/ddc_chain.v b/fpga/usrp3/lib/dsp/ddc_chain.v index 365175bf1..ccddc24e0 100644 --- a/fpga/usrp3/lib/dsp/ddc_chain.v +++ b/fpga/usrp3/lib/dsp/ddc_chain.v @@ -1,5 +1,5 @@ // -// Copyright 2011-2013 Ettus Research LLC +// Copyright 2011-2014 Ettus Research LLC // @@ -37,7 +37,7 @@ module ddc_chain wire [WIDTH-1:0] i_cic, q_cic; wire [WIDTH-1:0] i_hb1, q_hb1; wire [WIDTH-1:0] i_hb2, q_hb2; - + wire strobe_cic, strobe_hb1, strobe_hb2; wire enable_hb1, enable_hb2; wire [7:0] cic_decim_rate; @@ -45,7 +45,9 @@ module ddc_chain reg [WIDTH-1:0] rx_fe_i_mux, rx_fe_q_mux; wire realmode; wire swap_iq; - + wire invert_i; + wire invert_q; + setting_reg #(.my_addr(BASE+0)) sr_0 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), .in(set_data),.out(phase_inc),.changed()); @@ -58,22 +60,22 @@ module ddc_chain (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), .in(set_data),.out({enable_hb1, enable_hb2, cic_decim_rate}),.changed()); - setting_reg #(.my_addr(BASE+3), .width(2)) sr_3 + setting_reg #(.my_addr(BASE+3), .width(4)) sr_3 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), - .in(set_data),.out({realmode,swap_iq}),.changed()); + .in(set_data),.out({invert_i,inver_q,realmode,swap_iq}),.changed()); // MUX so we can do realmode signals on either input - + always @(posedge clk) if(swap_iq) begin - rx_fe_i_mux <= rx_fe_q; - rx_fe_q_mux <= realmode ? 0 : rx_fe_i; + rx_fe_i_mux <= invert_i ? ~rx_fe_q + 1 : rx_fe_q; + rx_fe_q_mux <= realmode ? 0 : invert_q ? ~rx_fe_i + 1 : rx_fe_i; end else begin - rx_fe_i_mux <= rx_fe_i; - rx_fe_q_mux <= realmode ? 0 : rx_fe_q; + rx_fe_i_mux <= invert_i ? ~rx_fe_i + 1 : rx_fe_i; + rx_fe_q_mux <= realmode ? 0 : invert_i ? ~rx_fe_q + 1 : rx_fe_q; end // NCO @@ -109,7 +111,7 @@ module ddc_chain decim_i (.clock(clk),.reset(rst),.enable(run), .rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic), .signal_in(i_cordic_clip),.signal_out(i_cic)); - + cic_decim #(.bw(WIDTH)) decim_q (.clock(clk),.reset(rst),.enable(run), .rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic), @@ -119,7 +121,7 @@ module ddc_chain small_hb_dec #(.WIDTH(WIDTH)) small_hb_i (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(run), .stb_in(strobe_cic),.data_in(i_cic),.stb_out(strobe_hb1),.data_out(i_hb1)); - + small_hb_dec #(.WIDTH(WIDTH)) small_hb_q (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(run), .stb_in(strobe_cic),.data_in(q_cic),.stb_out(),.data_out(q_hb1)); |