diff --git a/library/common/util_axis_syncgen.v b/library/common/util_axis_syncgen.v
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+++ b/library/common/util_axis_syncgen.v
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+// ***************************************************************************
+// ***************************************************************************
+// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
+//
+// In this HDL repository, there are many different and unique modules, consisting
+// of various HDL (Verilog or VHDL) components. The individual modules are
+// developed independently, and may be accompanied by separate and unique license
+// terms.
+//
+// The user should read each of these license terms, and understand the
+// freedoms and responsibilities that he or she has by using this source/core.
+//
+// This core 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.
+//
+// Redistribution and use of source or resulting binaries, with or without modification
+// of this file, are permitted under one of the following two license terms:
+//
+//   1. The GNU General Public License version 2 as published by the
+//      Free Software Foundation, which can be found in the top level directory
+//      of this repository (LICENSE_GPL2), and also online at:
+//      <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
+//
+// OR
+//
+//   2. An ADI specific BSD license, which can be found in the top level directory
+//      of this repository (LICENSE_ADIBSD), and also on-line at:
+//      https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD
+//      This will allow to generate bit files and not release the source code,
+//      as long as it attaches to an ADI device.
+//
+// ***************************************************************************
+// ***************************************************************************
+
+`timescale 1ns/100ps
+
+module util_axis_syncgen #(
+
+  parameter ASYNC_SYNC = 1) (
+
+  input      s_axis_aclk,
+  input      s_axis_aresetn,
+  input      s_axis_ready,
+  input      s_axis_valid,
+
+  input      ext_sync,
+  output     s_axis_sync);
+
+  wire       sync_int_s;
+  wire       sync_ack_s;
+  wire       sync_ack_int_s;
+  reg        synced = 1'b0;
+  reg        sync_int_d = 1'b0;
+  reg        s_axis_sync_int = 1'b0;
+
+  // generate CDC for external sync
+
+  sync_bits #(
+    .NUM_OF_BITS (1),
+    .ASYNC_CLK (ASYNC_SYNC))
+  i_axis_ext_sync (
+    .in_bits (ext_sync),
+    .out_clk (s_axis_aclk),
+    .out_resetn (s_axis_aresetn),
+    .out_bits (sync_int_s));
+
+  // generate the sync signal
+
+  assign sync_ack_s = sync_int_s & s_axis_ready & s_axis_valid;
+  assign sync_ack_int_s = s_axis_sync_int & s_axis_ready & s_axis_valid;
+
+  always @(posedge s_axis_aclk) begin
+    if (s_axis_aresetn == 1'b0) begin
+      sync_int_d <= 1'b0;
+      s_axis_sync_int <= 1'b0;
+      synced <= 1'b0;
+    end else begin
+      sync_int_d <= sync_int_s;
+      if (sync_int_s && ~sync_int_d) begin
+        s_axis_sync_int <= 1'b1;
+        synced <= 1'b0;
+      end
+      if (sync_ack_int_s) begin
+        synced <= 1'b1;
+        s_axis_sync_int <= 1'b0;
+      end
+    end
+  end
+
+  assign s_axis_sync = s_axis_sync_int | (sync_ack_s & ~synced);
+
+endmodule