1 files changed, 63 insertions, 0 deletions
diff --git a/fpga/usrp3/lib/timing/time_compare.v b/fpga/usrp3/lib/timing/time_compare.v
new file mode 100644
index 000000000..eded432e1
--- /dev/null
+++ b/fpga/usrp3/lib/timing/time_compare.v
@@ -0,0 +1,63 @@
+//
+// Copyright 2011-2012 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/>.
+//
+
+
+// 64 bits worth of ticks
+//
+// Not concerned with clock wrapping, human race will likely have extermintated it's self by this time.
+//
+
+module time_compare
+  (
+   input clk,
+   input reset,
+   input [63:0] time_now,
+   input [63:0] trigger_time,
+   output now,
+   output early,
+   output late,
+   output too_early);
+
+/*
+   reg [63:0] time_diff;
+
+   always @(posedge clk) begin
+        if (reset) begin
+            time_diff <= 64'b0;
+            now <= 1'b0;
+            late <= 1'b0;
+            early <= 1'b0;
+        end
+        else begin
+          time_diff <= trigger_time - time_now;
+          now <= ~(|time_diff);
+          late <= time_diff[63];
+          early <= ~now & ~late;
+       end
+   end
+   //assign now = ~(|time_diff);
+   //assign late = time_diff[63];
+   //assign early = ~now & ~late;
+   assign too_early = 0; //not implemented
+*/
+
+    assign now = time_now == trigger_time;
+    assign late = time_now > trigger_time;
+    assign early = ~now & ~late;
+    assign too_early = 0; //not implemented
+
+endmodule // time_compare