1 files changed, 30 insertions, 0 deletions
diff --git a/fpga/usrp3/lib/rfnoc/split_stream.v b/fpga/usrp3/lib/rfnoc/split_stream.v
new file mode 100644
index 000000000..ae24ca1f8
--- /dev/null
+++ b/fpga/usrp3/lib/rfnoc/split_stream.v
@@ -0,0 +1,30 @@
+//
+// Copyright 2014 Ettus Research LLC
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+
+module split_stream
+  #(parameter WIDTH=16,
+    parameter ACTIVE_MASK=4'b1111)
+   (input clk, input reset, input clear,  // These are not used in plain split_stream
+    input [WIDTH-1:0] i_tdata, input i_tlast, input i_tvalid, output i_tready,
+    output [WIDTH-1:0] o0_tdata, output o0_tlast, output o0_tvalid, input o0_tready,
+    output [WIDTH-1:0] o1_tdata, output o1_tlast, output o1_tvalid, input o1_tready,
+    output [WIDTH-1:0] o2_tdata, output o2_tlast, output o2_tvalid, input o2_tready,
+    output [WIDTH-1:0] o3_tdata, output o3_tlast, output o3_tvalid, input o3_tready);
+
+   assign { o0_tlast, o0_tdata } = { i_tlast, i_tdata };
+   assign { o1_tlast, o1_tdata } = { i_tlast, i_tdata };
+   assign { o2_tlast, o2_tdata } = { i_tlast, i_tdata };
+   assign { o3_tlast, o3_tdata } = { i_tlast, i_tdata };
+
+   // NOTE -- this violates the AXI spec because tvalids are dependent on treadys.
+   //   It will be ok most of the time, but muxes and demuxes will need a fifo in 
+   //   the middle to avoid deadlock
+   
+   assign i_tready = ~|(~{o3_tready,o2_tready,o1_tready,o0_tready} & ACTIVE_MASK);
+   assign { o3_tvalid, o2_tvalid, o1_tvalid, o0_tvalid } = {4{i_tready & i_tvalid}};
+   
+endmodule // split_stream