From 05d77f772317de5d925301aa11bb9a880656dd05 Mon Sep 17 00:00:00 2001 From: Josh Blum Date: Thu, 15 Apr 2010 11:24:24 -0700 Subject: moved usrp1 and usrp2 fpga dirs into fpga subdirectory --- fpga/usrp2/timing/time_compare.v | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 fpga/usrp2/timing/time_compare.v (limited to 'fpga/usrp2/timing/time_compare.v') diff --git a/fpga/usrp2/timing/time_compare.v b/fpga/usrp2/timing/time_compare.v new file mode 100644 index 000000000..a21c9f8e0 --- /dev/null +++ b/fpga/usrp2/timing/time_compare.v @@ -0,0 +1,23 @@ + +// Top 32 bits are integer seconds, bottom 32 are clock ticks within a second + +module time_compare + (input [63:0] time_now, + input [63:0] trigger_time, + output now, + output early, + output late, + output too_early); + + wire sec_match = (time_now[63:32] == trigger_time[63:32]); + wire sec_late = (time_now[63:32] > trigger_time[63:32]); + + wire tick_match = (time_now[31:0] == trigger_time[31:0]); + wire tick_late = (time_now[31:0] > trigger_time[31:0]); + + assign now = sec_match & tick_match; + assign late = sec_late | (sec_match & tick_late); + assign early = ~now & ~late; + assign too_early = (trigger_time[63:32] > (time_now[63:32] + 4)); // Don't wait too long + +endmodule // time_compare -- cgit v1.2.3