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

Original-commit: 0df4b801a34697f2058b4a7b95e08d2a0576c9db

lib/vita/new_tx_deframer.v

@@ -0,0 +1,92 @@
+
+
+module new_tx_deframer
+  (input clk, input reset, input clear,
+   input [63:0] i_tdata, input i_tlast, input i_tvalid, output i_tready,
+   output [175:0] sample_tdata, output sample_tvalid, input sample_tready, output [31:0] debug);
+
+   reg 		  odd, send_at, eob;
+   reg [11:0] 	  seqnum;
+   reg [31:0] 	  sid;
+   reg [63:0] 	  send_time;
+      
+   wire [175:0]   fifo_tdata = { odd, send_at, eob, i_tlast, seqnum/*12*/, sid, send_time/*64*/, i_tdata/*64*/ };
+   wire 	  fifo_tvalid, fifo_tready;
+
+   reg [1:0] 	  td_state;
+   localparam TD_HEAD = 0;
+   localparam TD_TIME = 1;
+   localparam TD_BODY = 2;
+   localparam TD_DUMP = 3;
+
+   always @(posedge clk)
+     if(reset | clear)
+       begin
+	  td_state <= TD_HEAD;
+	  odd <= 1'b0;
+	  send_at <= 1'b0;
+	  eob <= 1'b0;
+	  seqnum <= 12'd0;
+	  sid <= 32'd0;
+	  send_time <= 64'h0;
+       end // if (reset | clear)
+     else
+       case(td_state)
+	 TD_HEAD :
+	   if(i_tvalid)
+	     begin
+		if(~i_tlast)
+		  if(i_tdata[63])
+		    td_state <= TD_DUMP;
+		  else if(i_tdata[61])
+		    td_state <= TD_TIME;
+		  else
+		    td_state <= TD_BODY;
+		odd <= i_tdata[34];
+		send_at <= i_tdata[61];
+		eob <= i_tdata[60];
+		seqnum <= i_tdata[59:48];
+		sid <= i_tdata[31:0];
+		// FIXME record trailer, length, and SID here
+	     end
+	 TD_TIME :
+	   if(i_tvalid)
+	     begin
+		send_time <= i_tdata;
+		if(~i_tlast)
+		  td_state <= TD_BODY;
+		else
+		  td_state <= TD_HEAD;
+	     end
+	 TD_BODY :
+	   if(i_tvalid & fifo_tready)
+	     if(i_tlast)
+	       td_state <= TD_HEAD;
+	 TD_DUMP :
+	   if(i_tvalid)
+	     if(i_tlast)
+	       td_state <= TD_HEAD;
+       endcase // case (td_state)
+
+   assign fifo_tvalid = i_tvalid & (td_state == TD_BODY);
+   assign i_tready = (td_state == TD_BODY) ? fifo_tready : 1'b1;
+   
+   axi_fifo_short #(.WIDTH(176)) ofifo
+     (.clk(clk), .reset(reset), .clear(clear),
+      .i_tdata(fifo_tdata), .i_tvalid(fifo_tvalid), .i_tready(fifo_tready),
+      .o_tdata(sample_tdata), .o_tvalid(sample_tvalid), .o_tready(sample_tready),
+      .space(), .occupied());
+
+
+   assign debug = {
+		   sample_tvalid, // [8]
+		   sample_tready, // [7]
+		   i_tvalid,  // [6]
+		   i_tready,  // [5]
+		   td_state,  // [4:3]
+		   odd,       // [2]
+		   send_at,   // [1]
+		   eob        // [0]
+		   };
+   
+endmodule // new_tx_deframer