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-rw-r--r--usrp2/sdr_lib/ddc_chain.v94
-rw-r--r--usrp2/sdr_lib/dsp_rx_glue.v11
-rw-r--r--usrp2/sdr_lib/dsp_tx_glue.v11
-rw-r--r--usrp2/sdr_lib/duc_chain.v37
4 files changed, 88 insertions, 65 deletions
diff --git a/usrp2/sdr_lib/ddc_chain.v b/usrp2/sdr_lib/ddc_chain.v
index 800bb5b13..c32c9f491 100644
--- a/usrp2/sdr_lib/ddc_chain.v
+++ b/usrp2/sdr_lib/ddc_chain.v
@@ -18,14 +18,18 @@
//! The USRP digital down-conversion chain
module ddc_chain
- #(parameter BASE = 0, parameter DSPNO = 0)
+ #(
+ parameter BASE = 0,
+ parameter DSPNO = 0,
+ parameter WIDTH = 24
+ )
(input clk, input rst, input clr,
input set_stb, input [7:0] set_addr, input [31:0] set_data,
input set_stb_user, input [7:0] set_addr_user, input [31:0] set_data_user,
// From RX frontend
- input [23:0] rx_fe_i,
- input [23:0] rx_fe_q,
+ input [WIDTH-1:0] rx_fe_i,
+ input [WIDTH-1:0] rx_fe_q,
// To RX control
output [31:0] sample,
@@ -34,21 +38,25 @@ module ddc_chain
output [31:0] debug
);
+ localparam cwidth = 25;
+ localparam zwidth = 24;
+
+ wire ddc_enb;
wire [31:0] phase_inc;
reg [31:0] phase;
wire [17:0] scale_factor;
- wire [24:0] i_cordic, q_cordic;
- wire [23:0] i_cordic_clip, q_cordic_clip;
- wire [23:0] i_cic, q_cic;
- wire [23:0] i_hb1, q_hb1;
- wire [23:0] i_hb2, q_hb2;
+ wire [cwidth-1:0] i_cordic, q_cordic;
+ wire [WIDTH-1:0] i_cordic_clip, q_cordic_clip;
+ 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;
- reg [23:0] rx_fe_i_mux, rx_fe_q_mux;
+ reg [WIDTH-1:0] rx_fe_i_mux, rx_fe_q_mux;
wire realmode;
wire swap_iq;
@@ -74,103 +82,107 @@ module ddc_chain
if(swap_iq)
begin
rx_fe_i_mux <= rx_fe_q;
- rx_fe_q_mux <= realmode ? 24'd0 : rx_fe_i;
+ rx_fe_q_mux <= realmode ? 0 : rx_fe_i;
end
else
begin
rx_fe_i_mux <= rx_fe_i;
- rx_fe_q_mux <= realmode ? 24'd0 : rx_fe_q;
+ rx_fe_q_mux <= realmode ? 0 : rx_fe_q;
end
// NCO
always @(posedge clk)
if(rst)
phase <= 0;
- else if(~run)
+ else if(~ddc_enb)
phase <= 0;
else
phase <= phase + phase_inc;
- wire [23:0] to_cordic_i, to_cordic_q;
+ //sign extension of cordic input
+ wire [WIDTH-1:0] to_ddc_chain_i, to_ddc_chain_q;
+ wire [cwidth-1:0] to_cordic_i, to_cordic_q;
+ sign_extend #(.bits_in(WIDTH), .bits_out(cwidth)) sign_extend_cordic_i (.in(to_ddc_chain_i), .out(to_cordic_i));
+ sign_extend #(.bits_in(WIDTH), .bits_out(cwidth)) sign_extend_cordic_q (.in(to_ddc_chain_q), .out(to_cordic_q));
// CORDIC 24-bit I/O
- cordic_z24 #(.bitwidth(25))
- cordic(.clock(clk), .reset(rst), .enable(run),
- .xi({to_cordic_i[23],to_cordic_i}),. yi({to_cordic_q[23],to_cordic_q}), .zi(phase[31:8]),
+ cordic_z24 #(.bitwidth(cwidth))
+ cordic(.clock(clk), .reset(rst), .enable(ddc_enb),
+ .xi(to_cordic_i),. yi(to_cordic_q), .zi(phase[31:32-zwidth]),
.xo(i_cordic),.yo(q_cordic),.zo() );
- clip_reg #(.bits_in(25), .bits_out(24)) clip_i
+ clip_reg #(.bits_in(cwidth), .bits_out(WIDTH)) clip_i
(.clk(clk), .in(i_cordic), .strobe_in(1'b1), .out(i_cordic_clip));
- clip_reg #(.bits_in(25), .bits_out(24)) clip_q
+ clip_reg #(.bits_in(cwidth), .bits_out(WIDTH)) clip_q
(.clk(clk), .in(q_cordic), .strobe_in(1'b1), .out(q_cordic_clip));
// CIC decimator 24 bit I/O
- cic_strober cic_strober(.clock(clk),.reset(rst),.enable(run),.rate(cic_decim_rate),
+ cic_strober cic_strober(.clock(clk),.reset(rst),.enable(ddc_enb),.rate(cic_decim_rate),
.strobe_fast(1),.strobe_slow(strobe_cic) );
- cic_decim #(.bw(24))
- decim_i (.clock(clk),.reset(rst),.enable(run),
+ cic_decim #(.bw(WIDTH))
+ decim_i (.clock(clk),.reset(rst),.enable(ddc_enb),
.rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic),
.signal_in(i_cordic_clip),.signal_out(i_cic));
- cic_decim #(.bw(24))
- decim_q (.clock(clk),.reset(rst),.enable(run),
+ cic_decim #(.bw(WIDTH))
+ decim_q (.clock(clk),.reset(rst),.enable(ddc_enb),
.rate(cic_decim_rate),.strobe_in(1'b1),.strobe_out(strobe_cic),
.signal_in(q_cordic_clip),.signal_out(q_cic));
// First (small) halfband 24 bit I/O
- small_hb_dec #(.WIDTH(24)) small_hb_i
- (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(run),
+ small_hb_dec #(.WIDTH(WIDTH)) small_hb_i
+ (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(ddc_enb),
.stb_in(strobe_cic),.data_in(i_cic),.stb_out(strobe_hb1),.data_out(i_hb1));
- small_hb_dec #(.WIDTH(24)) small_hb_q
- (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(run),
+ small_hb_dec #(.WIDTH(WIDTH)) small_hb_q
+ (.clk(clk),.rst(rst),.bypass(~enable_hb1),.run(ddc_enb),
.stb_in(strobe_cic),.data_in(q_cic),.stb_out(),.data_out(q_hb1));
// Second (large) halfband 24 bit I/O
wire [8:0] cpi_hb = enable_hb1 ? {cic_decim_rate,1'b0} : {1'b0,cic_decim_rate};
- hb_dec #(.WIDTH(24)) hb_i
- (.clk(clk),.rst(rst),.bypass(~enable_hb2),.run(run),.cpi(cpi_hb),
+ hb_dec #(.WIDTH(WIDTH)) hb_i
+ (.clk(clk),.rst(rst),.bypass(~enable_hb2),.run(ddc_enb),.cpi(cpi_hb),
.stb_in(strobe_hb1),.data_in(i_hb1),.stb_out(strobe_hb2),.data_out(i_hb2));
- hb_dec #(.WIDTH(24)) hb_q
- (.clk(clk),.rst(rst),.bypass(~enable_hb2),.run(run),.cpi(cpi_hb),
+ hb_dec #(.WIDTH(WIDTH)) hb_q
+ (.clk(clk),.rst(rst),.bypass(~enable_hb2),.run(ddc_enb),.cpi(cpi_hb),
.stb_in(strobe_hb1),.data_in(q_hb1),.stb_out(),.data_out(q_hb2));
//scalar operation (gain of 6 bits)
wire [35:0] prod_i, prod_q;
MULT18X18S mult_i
- (.P(prod_i), .A(i_hb2[23:6]), .B(scale_factor), .C(clk), .CE(strobe_hb2), .R(rst) );
+ (.P(prod_i), .A(i_hb2[WIDTH-1:WIDTH-18]), .B(scale_factor), .C(clk), .CE(strobe_hb2), .R(rst) );
MULT18X18S mult_q
- (.P(prod_q), .A(q_hb2[23:6]), .B(scale_factor), .C(clk), .CE(strobe_hb2), .R(rst) );
+ (.P(prod_q), .A(q_hb2[WIDTH-1:WIDTH-18]), .B(scale_factor), .C(clk), .CE(strobe_hb2), .R(rst) );
//pipeline for the multiplier (gain of 10 bits)
- reg [23:0] prod_reg_i, prod_reg_q;
+ reg [WIDTH-1:0] prod_reg_i, prod_reg_q;
reg strobe_mult;
always @(posedge clk) begin
strobe_mult <= strobe_hb2;
- prod_reg_i <= prod_i[33:10];
- prod_reg_q <= prod_q[33:10];
+ prod_reg_i <= prod_i[33:34-WIDTH];
+ prod_reg_q <= prod_q[33:34-WIDTH];
end
// Round final answer to 16 bits
wire [31:0] ddc_chain_out;
wire ddc_chain_stb;
- round_sd #(.WIDTH_IN(24),.WIDTH_OUT(16)) round_i
+ round_sd #(.WIDTH_IN(WIDTH),.WIDTH_OUT(16)) round_i
(.clk(clk),.reset(rst), .in(prod_reg_i),.strobe_in(strobe_mult), .out(ddc_chain_out[31:16]), .strobe_out(ddc_chain_stb));
- round_sd #(.WIDTH_IN(24),.WIDTH_OUT(16)) round_q
+ round_sd #(.WIDTH_IN(WIDTH),.WIDTH_OUT(16)) round_q
(.clk(clk),.reset(rst), .in(prod_reg_q),.strobe_in(strobe_mult), .out(ddc_chain_out[15:0]), .strobe_out());
- dsp_rx_glue #(.DSPNO(DSPNO)) custom(
+ dsp_rx_glue #(.DSPNO(DSPNO), .WIDTH(WIDTH)) custom(
.clock(clk), .reset(rst), .clear(clr), .enable(run),
.set_stb(set_stb_user), .set_addr(set_addr_user), .set_data(set_data_user),
.frontend_i(rx_fe_i_mux), .frontend_q(rx_fe_q_mux),
- .ddc_in_i(to_cordic_i), .ddc_in_q(to_cordic_q),
- .ddc_out_sample(ddc_chain_out), .ddc_out_strobe(ddc_chain_stb),
+ .ddc_in_i(to_ddc_chain_i), .ddc_in_q(to_ddc_chain_q),
+ .ddc_out_sample(ddc_chain_out), .ddc_out_strobe(ddc_chain_stb), .ddc_out_enable(ddc_enb),
.bb_sample(sample), .bb_strobe(strobe));
assign debug = {enable_hb1, enable_hb2, run, strobe, strobe_cic, strobe_hb1, strobe_hb2};
diff --git a/usrp2/sdr_lib/dsp_rx_glue.v b/usrp2/sdr_lib/dsp_rx_glue.v
index e2a1d52b1..038a67a29 100644
--- a/usrp2/sdr_lib/dsp_rx_glue.v
+++ b/usrp2/sdr_lib/dsp_rx_glue.v
@@ -44,6 +44,7 @@ module dsp_rx_glue
//strobed samples {I16,Q16} from the RX DDC chain
input [31:0] ddc_out_sample,
input ddc_out_strobe, //high on valid sample
+ output ddc_out_enable, //enables DDC module
//strobbed baseband samples {I16,Q16} from this module
output [31:0] bb_sample,
@@ -60,14 +61,15 @@ module dsp_rx_glue
assign ddc_in_q = frontend_q;
assign bb_sample = ddc_out_sample;
assign bb_strobe = ddc_out_strobe;
+ assign ddc_out_enable = enable;
`else
- RX_DSP0_MODULE rx_dsp0_custom
+ `RX_DSP0_MODULE #(.WIDTH(WIDTH)) rx_dsp0_custom
(
.clock(clock), .reset(reset), .clear(clear), .enable(enable),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.frontend_i(frontend_i), .frontend_q(frontend_q),
.ddc_in_i(ddc_in_i), .ddc_in_q(ddc_in_q),
- .ddc_out_sample(ddc_out_sample), .ddc_out_strobe(ddc_out_strobe),
+ .ddc_out_sample(ddc_out_sample), .ddc_out_strobe(ddc_out_strobe), .ddc_out_enable(ddc_out_enable),
.bb_sample(bb_sample), .bb_strobe(bb_strobe)
);
`endif
@@ -78,14 +80,15 @@ module dsp_rx_glue
assign ddc_in_q = frontend_q;
assign bb_sample = ddc_out_sample;
assign bb_strobe = ddc_out_strobe;
+ assign ddc_out_enable = enable;
`else
- RX_DSP1_MODULE rx_dsp1_custom
+ `RX_DSP1_MODULE #(.WIDTH(WIDTH)) rx_dsp1_custom
(
.clock(clock), .reset(reset), .clear(clear), .enable(enable),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.frontend_i(frontend_i), .frontend_q(frontend_q),
.ddc_in_i(ddc_in_i), .ddc_in_q(ddc_in_q),
- .ddc_out_sample(ddc_out_sample), .ddc_out_strobe(ddc_out_strobe),
+ .ddc_out_sample(ddc_out_sample), .ddc_out_strobe(ddc_out_strobe), .ddc_out_enable(ddc_out_enable),
.bb_sample(bb_sample), .bb_strobe(bb_strobe)
);
`endif
diff --git a/usrp2/sdr_lib/dsp_tx_glue.v b/usrp2/sdr_lib/dsp_tx_glue.v
index 9af13c6c1..46f6789ee 100644
--- a/usrp2/sdr_lib/dsp_tx_glue.v
+++ b/usrp2/sdr_lib/dsp_tx_glue.v
@@ -44,6 +44,7 @@ module dsp_tx_glue
//strobed samples {I16,Q16} to the TX DUC chain
output [31:0] duc_in_sample,
input duc_in_strobe, //this is a backpressure signal
+ output duc_in_enable, //enables DUC module
//strobbed baseband samples {I16,Q16} to this module
input [31:0] bb_sample,
@@ -60,14 +61,15 @@ module dsp_tx_glue
assign frontend_q = duc_out_q;
assign duc_in_sample = bb_sample;
assign bb_strobe = duc_in_strobe;
+ assign duc_in_enable = enable;
`else
- TX_DSP0_MODULE tx_dsp0_custom
+ `TX_DSP0_MODULE #(.WIDTH(WIDTH)) tx_dsp0_custom
(
.clock(clock), .reset(reset), .clear(clear), .enable(enable),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.frontend_i(frontend_i), .frontend_q(frontend_q),
.duc_out_i(duc_out_i), .duc_out_q(duc_out_q),
- .duc_in_sample(duc_in_sample), .duc_in_strobe(duc_in_strobe),
+ .duc_in_sample(duc_in_sample), .duc_in_strobe(duc_in_strobe), .duc_in_enable(duc_in_enable),
.bb_sample(bb_sample), .bb_strobe(bb_strobe)
);
`endif
@@ -78,14 +80,15 @@ module dsp_tx_glue
assign frontend_q = duc_out_q;
assign duc_in_sample = bb_sample;
assign bb_strobe = duc_in_strobe;
+ assign duc_in_enable = enable;
`else
- TX_DSP1_MODULE tx_dsp1_custom
+ `TX_DSP1_MODULE #(.WIDTH(WIDTH)) tx_dsp1_custom
(
.clock(clock), .reset(reset), .clear(clear), .enable(enable),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.frontend_i(frontend_i), .frontend_q(frontend_q),
.duc_out_i(duc_out_i), .duc_out_q(duc_out_q),
- .duc_in_sample(duc_in_sample), .duc_in_strobe(duc_in_strobe),
+ .duc_in_sample(duc_in_sample), .duc_in_strobe(duc_in_strobe), .duc_in_enable(duc_in_enable),
.bb_sample(bb_sample), .bb_strobe(bb_strobe)
);
`endif
diff --git a/usrp2/sdr_lib/duc_chain.v b/usrp2/sdr_lib/duc_chain.v
index 7a72903a6..bd3402a1f 100644
--- a/usrp2/sdr_lib/duc_chain.v
+++ b/usrp2/sdr_lib/duc_chain.v
@@ -18,14 +18,18 @@
//! The USRP digital up-conversion chain
module duc_chain
- #(parameter BASE = 0, parameter DSPNO = 0)
+ #(
+ parameter BASE = 0,
+ parameter DSPNO = 0,
+ parameter WIDTH = 24
+ )
(input clk, input rst, input clr,
input set_stb, input [7:0] set_addr, input [31:0] set_data,
input set_stb_user, input [7:0] set_addr_user, input [31:0] set_data_user,
// To TX frontend
- output [23:0] tx_fe_i,
- output [23:0] tx_fe_q,
+ output [WIDTH-1:0] tx_fe_i,
+ output [WIDTH-1:0] tx_fe_q,
// From TX control
input [31:0] sample,
@@ -34,6 +38,7 @@ module duc_chain
output [31:0] debug
);
+ wire duc_enb;
wire [17:0] scale_factor;
wire [31:0] phase_inc;
reg [31:0] phase;
@@ -61,13 +66,13 @@ module duc_chain
reg strobe_hb2 = 1;
cic_strober #(.WIDTH(8))
- cic_strober(.clock(clk),.reset(rst),.enable(run & ~rate_change),.rate(interp_rate),
+ cic_strober(.clock(clk),.reset(rst),.enable(duc_enb & ~rate_change),.rate(interp_rate),
.strobe_fast(1),.strobe_slow(strobe_cic_pre) );
cic_strober #(.WIDTH(2))
- hb2_strober(.clock(clk),.reset(rst),.enable(run & ~rate_change),.rate(enable_hb2 ? 2 : 1),
+ hb2_strober(.clock(clk),.reset(rst),.enable(duc_enb & ~rate_change),.rate(enable_hb2 ? 2 : 1),
.strobe_fast(strobe_cic_pre),.strobe_slow(strobe_hb2_pre) );
cic_strober #(.WIDTH(2))
- hb1_strober(.clock(clk),.reset(rst),.enable(run & ~rate_change),.rate(enable_hb1 ? 2 : 1),
+ hb1_strober(.clock(clk),.reset(rst),.enable(duc_enb & ~rate_change),.rate(enable_hb1 ? 2 : 1),
.strobe_fast(strobe_hb2_pre),.strobe_slow(strobe_hb1_pre) );
always @(posedge clk) strobe_hb1 <= strobe_hb1_pre;
@@ -78,7 +83,7 @@ module duc_chain
always @(posedge clk)
if(rst)
phase <= 0;
- else if(~run)
+ else if(~duc_enb)
phase <= 0;
else
phase <= phase + phase_inc;
@@ -96,9 +101,9 @@ module duc_chain
// Note that max CIC rate is 128, which would give an overflow on cpo if enable_hb2 is true,
// but the default case inside hb_interp handles this
- hb_interp #(.IWIDTH(18),.OWIDTH(18),.ACCWIDTH(24)) hb_interp_i
+ hb_interp #(.IWIDTH(18),.OWIDTH(18),.ACCWIDTH(WIDTH)) hb_interp_i
(.clk(clk),.rst(rst),.bypass(~enable_hb1),.cpo(cpo),.stb_in(strobe_hb1),.data_in({bb_i, 2'b0}),.stb_out(strobe_hb2),.data_out(hb1_i));
- hb_interp #(.IWIDTH(18),.OWIDTH(18),.ACCWIDTH(24)) hb_interp_q
+ hb_interp #(.IWIDTH(18),.OWIDTH(18),.ACCWIDTH(WIDTH)) hb_interp_q
(.clk(clk),.rst(rst),.bypass(~enable_hb1),.cpo(cpo),.stb_in(strobe_hb1),.data_in({bb_q, 2'b0}),.stb_out(strobe_hb2),.data_out(hb1_q));
small_hb_int #(.WIDTH(18)) small_hb_interp_i
@@ -109,22 +114,22 @@ module duc_chain
.output_rate(interp_rate),.stb_out(strobe_cic),.data_out(hb2_q));
cic_interp #(.bw(18),.N(4),.log2_of_max_rate(7))
- cic_interp_i(.clock(clk),.reset(rst),.enable(run & ~rate_change),.rate(interp_rate),
+ cic_interp_i(.clock(clk),.reset(rst),.enable(duc_enb & ~rate_change),.rate(interp_rate),
.strobe_in(strobe_cic),.strobe_out(1),
.signal_in(hb2_i),.signal_out(i_interp));
cic_interp #(.bw(18),.N(4),.log2_of_max_rate(7))
- cic_interp_q(.clock(clk),.reset(rst),.enable(run & ~rate_change),.rate(interp_rate),
+ cic_interp_q(.clock(clk),.reset(rst),.enable(duc_enb & ~rate_change),.rate(interp_rate),
.strobe_in(strobe_cic),.strobe_out(1),
.signal_in(hb2_q),.signal_out(q_interp));
- localparam cwidth = 24; // was 18
+ localparam cwidth = WIDTH; // was 18
localparam zwidth = 24; // was 16
wire [cwidth-1:0] da_c, db_c;
cordic_z24 #(.bitwidth(cwidth))
- cordic(.clock(clk), .reset(rst), .enable(run),
+ cordic(.clock(clk), .reset(rst), .enable(duc_enb),
.xi({i_interp,{(cwidth-18){1'b0}}}),.yi({q_interp,{(cwidth-18){1'b0}}}),
.zi(phase[31:32-zwidth]),
.xo(da_c),.yo(db_c),.zo() );
@@ -147,12 +152,12 @@ module duc_chain
.R(rst) // Synchronous reset input
);
- dsp_tx_glue #(.DSPNO(DSPNO)) dsp_tx_glue(
+ dsp_tx_glue #(.DSPNO(DSPNO), .WIDTH(WIDTH)) dsp_tx_glue(
.clock(clk), .reset(rst), .clear(clr), .enable(run),
.set_stb(set_stb_user), .set_addr(set_addr_user), .set_data(set_data_user),
.frontend_i(tx_fe_i), .frontend_q(tx_fe_q),
- .duc_out_i(prod_i[33:10]), .duc_out_q(prod_q[33:10]),
- .duc_in_sample({bb_i, bb_q}), .duc_in_strobe(strobe_hb1),
+ .duc_out_i(prod_i[33:34-WIDTH]), .duc_out_q(prod_q[33:34-WIDTH]),
+ .duc_in_sample({bb_i, bb_q}), .duc_in_strobe(strobe_hb1), .duc_in_enable(duc_enb),
.bb_sample(sample), .bb_strobe(strobe));
assign debug = {strobe_cic, strobe_hb1, strobe_hb2,run};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 07:26:15 +0000