1 files changed, 30 insertions, 0 deletions
diff --git a/fpga/usrp3/lib/rfnoc/const.v b/fpga/usrp3/lib/rfnoc/const.v
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+++ b/fpga/usrp3/lib/rfnoc/const.v
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+//
+// Copyright 2014 Ettus Research LLC
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+
+module const
+  #(parameter WIDTH=32)
+   (input clk, input reset,
+    input [WIDTH-1:0] config_tdata, input config_tlast, input config_tvalid, output config_tready,
+    output [WIDTH-1:0] o_tdata, output o_tlast, output o_tvalid, input o_tready);
+
+   reg [WIDTH-1:0]     const_val;
+
+   always @(posedge clk)
+     if(reset)
+       const_val <= 0;
+     else
+       if(config_tvalid & config_tready)
+	 const_val <= config_tdata;
+
+   assign config_tready = 1'b1;
+   // FIXME do we want to sync constant change to tlasts?
+   
+   assign o_tdata = const_val;
+   assign o_tlast = 1'b0; // FIXME do we want something else here?
+   assign o_tvalid = 1'b1; // caution -- will fill up a fifo
+   
+endmodule // const