dsp: added tx_frontend, instantiated in u2/u2p

3 files changed, 59 insertions, 19 deletions

diff --git a/usrp2/sdr_lib/Makefile.srcs b/usrp2/sdr_lib/Makefile.srcs
index 6dab1db5e..defbced17 100644
--- a/usrp2/sdr_lib/Makefile.srcs
+++ b/usrp2/sdr_lib/Makefile.srcs
@@ -24,18 +24,16 @@ cordic.v \
 cordic_z24.v \
 cordic_stage.v \
 dsp_core_rx.v \
-dsp_core_rx_old.v \
 dsp_core_tx.v \
 hb_dec.v \
 hb_interp.v \
 round.v \
 round_reg.v \
 round_sd.v \
-rx_control.v \
 rx_dcoffset.v \
 rx_frontend.v \
 sign_extend.v \
 small_hb_dec.v \
 small_hb_int.v \
-tx_control.v \
+tx_frontend.v \
 ))
diff --git a/usrp2/sdr_lib/dsp_core_tx.v b/usrp2/sdr_lib/dsp_core_tx.v
index 58bd82f6e..66dcee261 100644
--- a/usrp2/sdr_lib/dsp_core_tx.v
+++ b/usrp2/sdr_lib/dsp_core_tx.v
@@ -21,8 +21,7 @@ module dsp_core_tx
   (input clk, input rst,
    input set_stb, input [7:0] set_addr, input [31:0] set_data,
 
-   output reg [15:0] dac_a,
-   output reg [15:0] dac_b,
+   output [23:0] tx_i, output [23:0] tx_q,
 
    // To tx_control
    input [31:0] sample,
@@ -148,20 +147,9 @@ module dsp_core_tx
       .CE(1),  // Clock enable input
       .R(rst)     // Synchronous reset input
       );
-   
-   always @(posedge clk)
-     case(dacmux_a)
-       0 : dac_a <= prod_i[28:13];
-       1 : dac_a <= prod_q[28:13];
-       default : dac_a <= 0;
-     endcase // case(dacmux_a)
-   
-   always @(posedge clk)
-     case(dacmux_b)
-       0 : dac_b <= prod_i[28:13];
-       1 : dac_b <= prod_q[28:13];
-       default : dac_b <= 0;
-     endcase // case(dacmux_b)
+
+   assign tx_i = prod_i[28:5];
+   assign tx_q = prod_q[28:5];
    
    assign      debug = {strobe_cic, strobe_hb1, strobe_hb2,run};
 
diff --git a/usrp2/sdr_lib/tx_frontend.v b/usrp2/sdr_lib/tx_frontend.v
new file mode 100644
index 000000000..2817c1510
--- /dev/null
+++ b/usrp2/sdr_lib/tx_frontend.v
@@ -0,0 +1,54 @@
+
+module tx_frontend
+  #(parameter BASE=0)
+   (input clk, input rst,
+    input set_stb, input [7:0] set_addr, input [31:0] set_data,
+    input [23:0] tx_i, input [23:0] tx_q, input run,
+    output reg [15:0] dac_a, output reg [15:0] dac_b
+    );
+
+   // IQ balance --> DC offset --> rounding --> mux
+
+   wire [23:0] i_dco, q_dco, i_ofs, q_ofs;
+   wire [15:0] i_final, q_final;
+   wire [7:0]  mux_ctrl;
+   
+   setting_reg #(.my_addr(BASE+0), .width(24)) sr_0
+     (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+      .in(set_data),.out(i_dco),.changed());
+
+   setting_reg #(.my_addr(BASE+1), .width(24)) sr_1
+     (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+      .in(set_data),.out(q_dco),.changed());
+
+   setting_reg #(.my_addr(BASE+2), .width(4)) sr_2
+     (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+      .in(set_data),.out(mux_ctrl),.changed());
+
+   add2_and_clip_reg #(.WIDTH(24)) add_dco_i
+     (.clk(clk), .rst(rst), .in1(i_dco), .in2(tx_i), .strobe_in(1'b1), .sum(i_ofs), .strobe_out());
+   
+   add2_and_clip_reg #(.WIDTH(24)) add_dco_q
+     (.clk(clk), .rst(rst), .in1(q_dco), .in2(tx_q), .strobe_in(1'b1), .sum(q_ofs), .strobe_out());
+   
+   round_sd #(.WIDTH_IN(24),.WIDTH_OUT(16)) round_i
+     (.clk(clk), .reset(rst), .in(i_ofs),.strobe_in(1'b1), .out(i_final), .strobe_out());
+
+   round_sd #(.WIDTH_IN(24),.WIDTH_OUT(16)) round_q
+     (.clk(clk), .reset(rst), .in(q_ofs),.strobe_in(1'b1), .out(q_final), .strobe_out());
+
+   always @(posedge clk)
+     case(mux_ctrl[3:0])
+       0 : dac_a <= i_final;
+       1 : dac_a <= q_final;
+       default : dac_a <= 0;
+     endcase // case (mux_ctrl[3:0])
+      
+   always @(posedge clk)
+     case(mux_ctrl[7:4])
+       0 : dac_b <= i_final;
+       1 : dac_b <= q_final;
+       default : dac_b <= 0;
+     endcase // case (mux_ctrl[7:4])
+      
+endmodule // tx_frontend