Merge 'maint' into x300/bug513

1 files changed, 22 insertions, 0 deletions

diff --git a/fpga/usrp3/lib/timing/pps.v b/fpga/usrp3/lib/timing/pps.v
new file mode 100644
index 000000000..49d3641b7
--- /dev/null
+++ b/fpga/usrp3/lib/timing/pps.v
@@ -0,0 +1,22 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+
+module pps_generator
+    #(parameter CLK_FREQ=0, DUTY=25)
+    (input clk, input reset, output pps);
+
+    reg[31:0] count;
+
+    always @(posedge clk) begin
+        if (reset) begin
+            count <= 32'b1;
+        end else if (count >= CLK_FREQ) begin
+            count <= 32'b1;
+        end else begin
+            count <= count + 1'b1;
+        end
+    end
+
+    assign pps = (count < CLK_FREQ * DUTY / 100);
+endmodule //pps_generator