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+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+
+module vita_pkt_gen
+ (input clk, input reset, input clear,
+ input [15:0] len,
+ output [35:0] data_o, output src_rdy_o, input dst_rdy_i);
+
+ reg [15:0] state;
+ reg [31:0] seq, data;
+
+ wire sof = (state == 0);
+ wire eof = (state == (len-1));
+ wire consume = src_rdy_o & dst_rdy_i;
+
+ assign src_rdy_o = 1;
+
+ always @(posedge clk)
+ if(reset | clear)
+ begin
+ state <= 0;
+ seq <= 0;
+ end
+ else
+ if(consume)
+ if(eof)
+ begin
+ state <= 0;
+ seq <= seq + 1;
+ end
+ else
+ state <= state + 1;
+
+ always @*
+ case(state)
+ 0 : data <= {24'h000,seq[3:0],len};
+ 1 : data <= seq;
+ default : data <= {~state,state};
+ endcase // case (state)
+
+ assign data_o = {2'b00, eof, sof, data};
+
+endmodule // vita_pkt_gen