Squashed B200 FPGA Source. Code from Josh Blum, Ian Buckley, and Matt Ettus.

Original-commit: 0df4b801a34697f2058b4a7b95e08d2a0576c9db

lib/vita/chdr_32f_to_16sc.v

@@ -0,0 +1,142 @@
+//
+// Copyright 2013 Ettus Research LLC
+//
+
+
+
+module chdr_32f_to_16sc
+  #(parameter BASE=0)
+   (input set_stb, input [7:0] set_addr, input [31:0] set_data,
+    
+    input 	      clk, input reset,
+    input [63:0]      i_tdata,
+    input 	      i_tlast,
+    input 	      i_tvalid,
+    output 	      i_tready,
+  
+    output reg [63:0] o_tdata,
+    output 	      o_tlast,
+    output 	      o_tvalid,
+    input 	      o_tready,
+
+    output [31:0]     debug
+    );
+
+ 
+   wire 	      chdr_has_hdr = 1'b1;
+   wire 	      chdr_has_time = i_tdata[61];
+   wire 	      chdr_has_tlr = 1'b0;
+
+   wire [15:0] 	      s0_imag;
+   wire [15:0] 	      s0_real;
+   wire [15:0] 	      s1_imag;
+   wire [15:0] 	      s1_real;
+   
+
+   reg [15:0] 	      imag0;
+   reg [15:0] 	      real0;
+   wire [15:0] 	      imag1;
+   wire [15:0] 	      real1;
+   
+
+
+
+   
+
+
+   //chdr length calculations
+   wire [15:0] 	      chdr_header_lines = chdr_has_time? 16 : 8;
+
+   wire [15:0] 	      samples = ((i_tdata[47:32] - chdr_header_lines) >> 1);
+
+   wire [15:0] 	      chdr_payload_lines = samples + chdr_header_lines;
+
+
+   wire 	      set_sid;
+   wire [15:0] 	      my_newhome;
+
+   setting_reg #(.my_addr(BASE), .width(17)) new_destination
+     (.clk(clk), .rst(reset), .strobe(set_stb), .addr(set_addr), .in(set_data),
+      .out({set_sid, my_newhome[15:0]}));
+
+ 
+
+   localparam HEADER        = 2'd0;//IDLE
+   localparam TIME    = 2'd1;
+   localparam ODD           = 2'd2;
+   localparam EVEN          = 2'd3;
+
+   reg [1:0] 	      state;
+   
+   always @(posedge clk) begin
+      if (reset) begin
+         state <= HEADER;
+
+      end
+      else if (i_tvalid && i_tready) case(state)
+
+	      HEADER: begin
+		if (!i_tlast) state <= (i_tdata[61])? TIME : ODD;
+	      end
+	      
+	      TIME: begin
+		state <= (i_tlast)? HEADER: ODD;
+	      end
+	      
+	      ODD: begin
+		state <= (i_tlast)? HEADER: EVEN;
+	      end
+
+	      EVEN: begin
+		state <= (i_tlast)? HEADER: ODD;
+	      end
+	      
+	      default: state <= HEADER;
+	    endcase
+   end // always @ (posedge clk)
+
+   //hold data after each input transfer
+   reg [63:0] 	       hold_tdata;
+   always @(posedge clk) begin
+    	if (i_tvalid && i_tready) hold_tdata <= i_tdata;
+   end
+
+
+   
+   float_to_iq #(.BITS_IN(32),.BITS_OUT(16))
+   float_to_iq_imag0 (.in(i_tdata[63:32]),.out(s1_imag[15:0]));
+
+   float_to_iq #(.BITS_IN(32),.BITS_OUT(16))
+   float_to_iq_real0 (.in(i_tdata[31:0]),.out(s1_real[15:0]));
+
+   
+   float_to_iq #(.BITS_IN(32),.BITS_OUT(16))
+   float_to_iq_imag1 (.in(hold_tdata[63:32]),.out(s0_imag[15:0]));
+
+   
+   float_to_iq #(.BITS_IN(32),.BITS_OUT(16))
+   float_to_iq_real1 (.in(hold_tdata[31:0]),.out(s0_real[15:0]));
+
+
+   
+
+   always @(*) 
+     case(state)
+       
+       HEADER: o_tdata <= {i_tdata[63:48], chdr_payload_lines,
+			   set_sid ? {i_tdata[15:0], my_newhome[15:0]}:i_tdata[31:0]};
+       TIME: o_tdata <= i_tdata;
+       ODD: o_tdata <= {s1_imag, s1_real, 32'h0};
+       EVEN: o_tdata <= {s0_imag, s0_real, s1_imag, s1_real};
+       
+      default : o_tdata = i_tdata;
+     endcase
+   
+   assign o_tvalid =  i_tvalid && (state != ODD || i_tlast);  
+   assign i_tready =  o_tready || (state == ODD && !i_tlast); 
+   assign o_tlast  = i_tlast;
+
+endmodule
+
+
+