2 `define DSP_CORE_RX_BASE 160
5 input set_stb, input [7:0] set_addr, input [31:0] set_data,
7 input [13:0] adc_a, input adc_ovf_a,
8 input [13:0] adc_b, input adc_ovf_b,
16 wire [15:0] scale_i, scale_q;
17 wire [13:0] adc_a_ofs, adc_b_ofs;
18 reg [13:0] adc_i, adc_q;
19 wire [31:0] phase_inc;
22 wire [35:0] prod_i, prod_q;
23 wire [23:0] i_cordic, q_cordic;
24 wire [23:0] i_cic, q_cic;
25 wire [17:0] i_cic_scaled, q_cic_scaled;
26 wire [17:0] i_hb1, q_hb1;
27 wire [17:0] i_hb2, q_hb2;
28 wire [15:0] i_out, q_out;
30 wire strobe_cic, strobe_hb1, strobe_hb2;
31 wire enable_hb1, enable_hb2;
32 wire [7:0] cic_decim_rate;
34 setting_reg #(.my_addr(`DSP_CORE_RX_BASE+0)) sr_0
35 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
36 .in(set_data),.out(phase_inc),.changed());
38 setting_reg #(.my_addr(`DSP_CORE_RX_BASE+1)) sr_1
39 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
40 .in(set_data),.out({scale_i,scale_q}),.changed());
42 setting_reg #(.my_addr(`DSP_CORE_RX_BASE+2)) sr_2
43 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
44 .in(set_data),.out({enable_hb1, enable_hb2, cic_decim_rate}),.changed());
46 rx_dcoffset #(.WIDTH(14),.ADDR(`DSP_CORE_RX_BASE+6)) rx_dcoffset_a
47 (.clk(clk),.rst(rst),.set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
48 .adc_in(adc_a),.adc_out(adc_a_ofs));
50 rx_dcoffset #(.WIDTH(14),.ADDR(`DSP_CORE_RX_BASE+7)) rx_dcoffset_b
51 (.clk(clk),.rst(rst),.set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
52 .adc_in(adc_b),.adc_out(adc_b_ofs));
55 setting_reg #(.my_addr(`DSP_CORE_RX_BASE+8)) sr_8
56 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
57 .in(set_data),.out(muxctrl),.changed());
59 // The TVRX connects to what is called adc_b, thus A and B are
60 // swapped throughout the design.
62 // In the interest of expediency and keeping the s/w sane, we just remap them here.
63 // The I & Q fields are mapped the same:
64 // 0 -> "the real A" (as determined by the TVRX)
69 case(muxctrl[1:0]) // The I mapping
70 0: adc_i <= adc_b_ofs; // "the real A"
71 1: adc_i <= adc_a_ofs;
74 endcase // case(muxctrl[1:0])
77 case(muxctrl[3:2]) // The Q mapping
78 0: adc_q <= adc_b_ofs; // "the real A"
79 1: adc_q <= adc_a_ofs;
82 endcase // case(muxctrl[3:2])
88 phase <= phase + phase_inc;
91 (.P(prod_i), // 36-bit multiplier output
92 .A({{4{adc_i[13]}},adc_i} ), // 18-bit multiplier input
93 .B({{2{scale_i[15]}},scale_i}), // 18-bit multiplier input
94 .C(clk), // Clock input
95 .CE(1), // Clock enable input
96 .R(rst) // Synchronous reset input
100 (.P(prod_q), // 36-bit multiplier output
101 .A({{4{adc_q[13]}},adc_q} ), // 18-bit multiplier input
102 .B({{2{scale_q[15]}},scale_q}), // 18-bit multiplier input
103 .C(clk), // Clock input
104 .CE(1), // Clock enable input
105 .R(rst) // Synchronous reset input
108 cordic #(.bitwidth(24))
109 cordic(.clock(clk), .reset(rst), .enable(run),
110 .xi(prod_i[23:0]),. yi(prod_q[23:0]), .zi(phase[31:16]),
111 .xo(i_cordic),.yo(q_cordic),.zo() );
113 cic_strober cic_strober(.clock(clk),.reset(rst),.enable(run),.rate(cic_decim_rate),
114 .strobe_fast(1),.strobe_slow(strobe_cic) );
117 decim_i (.clock(clk),.reset(rst),.enable(run),
118 .rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic),
119 .signal_in(i_cordic),.signal_out(i_cic));
122 decim_q (.clock(clk),.reset(rst),.enable(run),
123 .rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic),
124 .signal_in(q_cordic),.signal_out(q_cic));
126 round_reg #(.bits_in(24),.bits_out(18)) round_icic (.clk(clk),.in(i_cic),.out(i_cic_scaled));
127 round_reg #(.bits_in(24),.bits_out(18)) round_qcic (.clk(clk),.in(q_cic),.out(q_cic_scaled));
129 always @(posedge clk) strobe_cic_d1 <= strobe_cic;
131 small_hb_dec #(.WIDTH(18)) small_hb_i
132 (.clk(clk),.rst(rst),.bypass(~enable_hb1),
133 .stb_in(strobe_cic_d1),.data_in(i_cic_scaled),.stb_out(strobe_hb1),.data_out(i_hb1));
135 small_hb_dec #(.WIDTH(18)) small_hb_q
136 (.clk(clk),.rst(rst),.bypass(~enable_hb1),
137 .stb_in(strobe_cic_d1),.data_in(q_cic_scaled),.stb_out(),.data_out(q_hb1));
139 wire [8:0] cpi_hb = enable_hb1 ? {cic_decim_rate,1'b0} : {1'b0,cic_decim_rate};
140 hb_dec #(.IWIDTH(18), .OWIDTH(18), .CWIDTH(18), .ACCWIDTH(24)) hb_i
141 (.clk(clk),.rst(rst),.bypass(~enable_hb2),.cpi(cpi_hb),
142 .stb_in(strobe_hb1),.data_in(i_hb1),.stb_out(strobe_hb2),.data_out(i_hb2));
144 hb_dec #(.IWIDTH(18), .OWIDTH(18), .CWIDTH(18), .ACCWIDTH(24)) hb_q
145 (.clk(clk),.rst(rst),.bypass(~enable_hb2),.cpi(cpi_hb),
146 .stb_in(strobe_hb1),.data_in(q_hb1),.stb_out(),.data_out(q_hb2));
148 round #(.bits_in(18),.bits_out(16)) round_iout (.in(i_hb2),.out(i_out));
149 round #(.bits_in(18),.bits_out(16)) round_qout (.in(q_hb2),.out(q_out));
151 assign sample = {i_out,q_out};
152 assign strobe = strobe_hb2;
153 assign debug = {enable_hb1, enable_hb2, run, strobe, strobe_cic, strobe_cic_d1, strobe_hb1, strobe_hb2};
155 endmodule // dsp_core_rx