From 8b377a9d6d0ad281474a8dbff49ea3b093178b28 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Fri, 22 Jan 2010 16:00:45 -0800
Subject: moved into subdir
---
usrp2/sdr_lib/dsp_core_rx.v | 179 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 179 insertions(+)
create mode 100644 usrp2/sdr_lib/dsp_core_rx.v
(limited to 'usrp2/sdr_lib/dsp_core_rx.v')
diff --git a/usrp2/sdr_lib/dsp_core_rx.v b/usrp2/sdr_lib/dsp_core_rx.v
new file mode 100644
index 000000000..2ac429630
--- /dev/null
+++ b/usrp2/sdr_lib/dsp_core_rx.v
@@ -0,0 +1,179 @@
+
+module dsp_core_rx
+ #(parameter BASE = 160)
+ (input clk, input rst,
+ input set_stb, input [7:0] set_addr, input [31:0] set_data,
+
+ input [13:0] adc_a, input adc_ovf_a,
+ input [13:0] adc_b, input adc_ovf_b,
+
+ input [15:0] io_rx,
+
+ output [31:0] sample,
+ input run,
+ output strobe,
+ output [31:0] debug
+ );
+
+ wire [15:0] scale_i, scale_q;
+ wire [13:0] adc_a_ofs, adc_b_ofs;
+ reg [13:0] adc_i, adc_q;
+ wire [31:0] phase_inc;
+ reg [31:0] phase;
+
+ wire [35:0] prod_i, prod_q;
+ wire [23:0] i_cordic, q_cordic;
+ wire [23:0] i_cic, q_cic;
+ wire [17:0] i_cic_scaled, q_cic_scaled;
+ wire [17:0] i_hb1, q_hb1;
+ wire [17:0] i_hb2, q_hb2;
+ wire [15:0] i_out, q_out;
+
+ wire strobe_cic, strobe_hb1, strobe_hb2;
+ wire enable_hb1, enable_hb2;
+ wire [7:0] cic_decim_rate;
+
+ 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());
+
+ setting_reg #(.my_addr(BASE+1)) sr_1
+ (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out({scale_i,scale_q}),.changed());
+
+ setting_reg #(.my_addr(BASE+2)) sr_2
+ (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out({enable_hb1, enable_hb2, cic_decim_rate}),.changed());
+
+ rx_dcoffset #(.WIDTH(14),.ADDR(BASE+3)) rx_dcoffset_a
+ (.clk(clk),.rst(rst),.set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
+ .adc_in(adc_a),.adc_out(adc_a_ofs));
+
+ rx_dcoffset #(.WIDTH(14),.ADDR(BASE+4)) rx_dcoffset_b
+ (.clk(clk),.rst(rst),.set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
+ .adc_in(adc_b),.adc_out(adc_b_ofs));
+
+ wire [3:0] muxctrl;
+ setting_reg #(.my_addr(BASE+5)) sr_8
+ (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(muxctrl),.changed());
+
+ wire [1:0] gpio_ena;
+ setting_reg #(.my_addr(BASE+6)) sr_9
+ (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(gpio_ena),.changed());
+
+ // The TVRX connects to what is called adc_b, thus A and B are
+ // swapped throughout the design.
+ //
+ // In the interest of expediency and keeping the s/w sane, we just remap them here.
+ // The I & Q fields are mapped the same:
+ // 0 -> "the real A" (as determined by the TVRX)
+ // 1 -> "the real B"
+ // 2 -> const zero
+
+ always @(posedge clk)
+ case(muxctrl[1:0]) // The I mapping
+ 0: adc_i <= adc_b_ofs; // "the real A"
+ 1: adc_i <= adc_a_ofs;
+ 2: adc_i <= 0;
+ default: adc_i <= 0;
+ endcase // case(muxctrl[1:0])
+
+ always @(posedge clk)
+ case(muxctrl[3:2]) // The Q mapping
+ 0: adc_q <= adc_b_ofs; // "the real A"
+ 1: adc_q <= adc_a_ofs;
+ 2: adc_q <= 0;
+ default: adc_q <= 0;
+ endcase // case(muxctrl[3:2])
+
+ always @(posedge clk)
+ if(rst)
+ phase <= 0;
+ else if(~run)
+ phase <= 0;
+ else
+ phase <= phase + phase_inc;
+
+ MULT18X18S mult_i
+ (.P(prod_i), // 36-bit multiplier output
+ .A({{4{adc_i[13]}},adc_i} ), // 18-bit multiplier input
+ .B({{2{scale_i[15]}},scale_i}), // 18-bit multiplier input
+ .C(clk), // Clock input
+ .CE(1), // Clock enable input
+ .R(rst) // Synchronous reset input
+ );
+
+ MULT18X18S mult_q
+ (.P(prod_q), // 36-bit multiplier output
+ .A({{4{adc_q[13]}},adc_q} ), // 18-bit multiplier input
+ .B({{2{scale_q[15]}},scale_q}), // 18-bit multiplier input
+ .C(clk), // Clock input
+ .CE(1), // Clock enable input
+ .R(rst) // Synchronous reset input
+ );
+
+
+ cordic_z24 #(.bitwidth(24))
+ cordic(.clock(clk), .reset(rst), .enable(run),
+ .xi(prod_i[23:0]),. yi(prod_q[23:0]), .zi(phase[31:8]),
+ .xo(i_cordic),.yo(q_cordic),.zo() );
+
+ 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));
+
+ 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));
+
+ round_reg #(.bits_in(24),.bits_out(18)) round_icic (.clk(clk),.in(i_cic),.out(i_cic_scaled));
+ round_reg #(.bits_in(24),.bits_out(18)) round_qcic (.clk(clk),.in(q_cic),.out(q_cic_scaled));
+ reg strobe_cic_d1;
+ always @(posedge clk) strobe_cic_d1 <= strobe_cic;
+
+ small_hb_dec #(.WIDTH(18)) small_hb_i
+ (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(run),
+ .stb_in(strobe_cic_d1),.data_in(i_cic_scaled),.stb_out(strobe_hb1),.data_out(i_hb1));
+
+ small_hb_dec #(.WIDTH(18)) small_hb_q
+ (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(run),
+ .stb_in(strobe_cic_d1),.data_in(q_cic_scaled),.stb_out(),.data_out(q_hb1));
+
+ wire [8:0] cpi_hb = enable_hb1 ? {cic_decim_rate,1'b0} : {1'b0,cic_decim_rate};
+ hb_dec #(.IWIDTH(18), .OWIDTH(18), .CWIDTH(18), .ACCWIDTH(24)) hb_i
+ (.clk(clk),.rst(rst),.bypass(~enable_hb2),.run(run),.cpi(cpi_hb),
+ .stb_in(strobe_hb1),.data_in(i_hb1),.stb_out(strobe_hb2),.data_out(i_hb2));
+
+ hb_dec #(.IWIDTH(18), .OWIDTH(18), .CWIDTH(18), .ACCWIDTH(24)) hb_q
+ (.clk(clk),.rst(rst),.bypass(~enable_hb2),.run(run),.cpi(cpi_hb),
+ .stb_in(strobe_hb1),.data_in(q_hb1),.stb_out(),.data_out(q_hb2));
+
+ round #(.bits_in(18),.bits_out(16)) round_iout (.in(i_hb2),.out(i_out));
+ round #(.bits_in(18),.bits_out(16)) round_qout (.in(q_hb2),.out(q_out));
+
+ // Streaming GPIO
+ //
+ // io_rx[15] => I channel LSB if gpio_ena[0] high
+ // io_rx[14] => Q channel LSB if gpio_ena[1] high
+
+ reg [31:0] sample_reg;
+ always @(posedge clk)
+ begin
+ sample_reg[31:17] <= i_out[15:1];
+ sample_reg[15:1] <= q_out[15:1];
+ sample_reg[16] <= gpio_ena[0] ? io_rx[15] : i_out[0];
+ sample_reg[0] <= gpio_ena[1] ? io_rx[14] : q_out[0];
+ end
+
+ assign sample = sample_reg;
+ assign strobe = strobe_hb2;
+ assign debug = {enable_hb1, enable_hb2, run, strobe, strobe_cic, strobe_cic_d1, strobe_hb1, strobe_hb2};
+
+endmodule // dsp_core_rx
--
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