fpga: Multiple X300 FPGA bugfixes and enhancements

- Fixed 10GigE firmware communication issues and sequence errors for TX
- Multiple changes to help ease timing closure
- Cleaned up build scripts
- Switched to Xilinx ISE 14.7 as the default build tool for X300


Original-commit: 64d71dcbc5fa6790385b288de25224d386b047b0

lib/packet_proc/axis_packet_debug.v

@@ -0,0 +1,71 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+
+module axis_packet_debug (
+   input          clk,
+   input          reset,
+   input          clear,
+
+   //Packet In
+   input [63:0]   tdata,
+   input          tlast,
+   input          tvalid,
+   input          tready,
+
+   //Per packet info
+   output reg           pkt_strobe,
+   output reg [15:0]    length,
+   output reg [63:0]    checksum,
+   
+   //Statistics
+   output reg [31:0]    pkt_count
+);
+
+   localparam ST_HEADER = 1'b0;
+   localparam ST_DATA   = 1'b1;
+
+   //Packet state logic
+   reg   pkt_state;
+   always @(posedge clk) begin
+      if (reset) begin
+         pkt_state <= ST_HEADER;
+      end else if (tvalid & tready) begin
+         pkt_state <= tlast ? ST_HEADER : ST_DATA;
+      end
+   end
+
+   //Trigger logic
+   always @(posedge clk)
+      if (reset)
+         pkt_strobe <= 1'b0;
+      else
+         pkt_strobe <= tvalid & tready & tlast;
+
+   //Length capture
+   always @(posedge clk)
+      if (reset || pkt_state == ST_HEADER)
+         length <= tlast ? 16'd8 : 16'd0;
+      else
+         if (tvalid & tready)
+            length <= length + 16'd8;
+
+   //Checksum capture
+   always @(posedge clk)
+      if (reset || pkt_state == ST_HEADER)
+         checksum <= 64'd0;
+      else
+         if (tvalid & tready)
+            checksum <= checksum ^ tdata;
+
+   //Counts
+   always @(posedge clk)
+      if (reset | clear) begin
+         pkt_count <= 32'd0;
+      end else begin
+         if (tvalid & tready & tlast) begin
+            pkt_count <= pkt_count + 32'd1;
+         end
+      end
+
+endmodule // cvita_packet_debug