1 files changed, 110 insertions, 0 deletions
diff --git a/usrp2/timing/time_sender.v b/usrp2/timing/time_sender.v
new file mode 100644
index 000000000..aa2fcbbdb
--- /dev/null
+++ b/usrp2/timing/time_sender.v
@@ -0,0 +1,110 @@
+
+
+module time_sender
+  (input clk, input rst,
+   input [31:0] master_time,
+   input send_sync,
+   output exp_pps_out);
+
+   reg [7:0] datain;
+   reg 	     k;
+   wire [9:0] dataout;
+   reg [9:0] dataout_reg;
+   reg 	     disp_reg;
+   wire      disp, new_word;
+   
+   encode_8b10b encode_8b10b 
+     (.datain({k,datain}),.dispin(disp_reg),
+      .dataout(dataout),.dispout(disp));
+
+   assign    exp_pps_out = dataout_reg[0];
+
+   always @(posedge clk)
+     if(rst)
+       disp_reg <= 0;
+     else if(new_word)
+       disp_reg <= disp;
+   
+   always @(posedge clk)
+     if(rst)
+       dataout_reg <= 0;
+     else if(new_word)
+       dataout_reg <= dataout;
+     else
+       dataout_reg <= {1'b0,dataout_reg[9:1]};
+   
+   reg [4:0] state;
+   reg [3:0] bit_count;
+
+   assign    new_word = (bit_count == 9);
+   
+   always @(posedge clk)
+     if(rst)
+       bit_count <= 0;
+     else if(new_word | send_sync)
+       bit_count <= 0;
+     else
+       bit_count <= bit_count + 1;
+
+   localparam SEND_IDLE = 0;
+   localparam SEND_HEAD = 1;
+   localparam SEND_T0 = 2;
+   localparam SEND_T1 = 3;
+   localparam SEND_T2 = 4;
+   localparam SEND_T3 = 5;
+
+   localparam COMMA = 8'hBC;
+   localparam HEAD = 8'h3C;
+
+   reg [31:0] master_time_reg;
+   
+   always @(posedge clk)
+     if(rst)
+       master_time_reg <= 0;
+     else if(send_sync)
+       master_time_reg <= master_time;
+   
+   always @(posedge clk)
+     if(rst)
+       begin
+	  {k,datain} <= 0;
+	  state <= SEND_IDLE;
+       end
+     else
+       if(send_sync)
+	 state <= SEND_HEAD;
+       else if(new_word)
+	 case(state)
+	   SEND_IDLE :
+	     {k,datain} <= {1'b1,COMMA};
+	   SEND_HEAD :
+	     begin
+		{k,datain} <= {1'b1, HEAD};
+		state <= SEND_T0;
+	     end
+	   SEND_T0 :
+	     begin
+		{k,datain} <= {1'b0, master_time_reg[31:24] };
+		state <= SEND_T1;
+	     end
+	   SEND_T1 :
+	     begin
+		{k,datain} <= {1'b0, master_time_reg[23:16]};
+		state <= SEND_T2;
+	     end
+	   SEND_T2 :
+	     begin
+		{k,datain} <= {1'b0, master_time_reg[15:8]};
+		state <= SEND_T3;
+	     end
+	   SEND_T3 :
+	     begin
+		{k,datain} <= {1'b0, master_time_reg[7:0]};
+		state <= SEND_IDLE;
+	     end
+	   default :
+	     state <= SEND_IDLE;
+	 endcase // case(state)
+   
+   
+endmodule // time_sender