From 8fbedd86500a9d8603ec104369fc3afd833ea2ca Mon Sep 17 00:00:00 2001 From: Matt Ettus Date: Thu, 9 Dec 2010 18:28:00 -0800 Subject: reimplemented mimo time transfer to handle 64 bits. Still needs to sync on the received side. --- usrp2/timing/time_64bit.v | 42 ++++++++++++++++++++++++++++++++++++------ 1 file changed, 36 insertions(+), 6 deletions(-) (limited to 'usrp2/timing/time_64bit.v') diff --git a/usrp2/timing/time_64bit.v b/usrp2/timing/time_64bit.v index 51c006962..1889e73da 100644 --- a/usrp2/timing/time_64bit.v +++ b/usrp2/timing/time_64bit.v @@ -3,12 +3,13 @@ module time_64bit #(parameter TICKS_PER_SEC = 32'd100000000, parameter BASE = 0) - (input clk, input rst, - input set_stb, input [7:0] set_addr, input [31:0] set_data, - input pps, - output [63:0] vita_time, output pps_int - ); - + (input clk, input rst, + input set_stb, input [7:0] set_addr, input [31:0] set_data, + input pps, + output [63:0] vita_time, output pps_int, + input exp_time_in, output exp_time_out + ); + localparam NEXT_SECS = 0; localparam NEXT_TICKS = 1; localparam PPS_POLSRC = 2; @@ -91,5 +92,34 @@ module time_64bit ticks <= ticks_plus_one; assign pps_int = pps_edge; + + localparam SYNC_RATE = 59999; // Send every 600uS + reg [15:0] sync_counter; + wire send_sync = (sync_counter == SYNC_RATE); + wire sync_rcvd; + + always @(posedge clk) + if(rst) + sync_counter <= 0; + else + if(send_sync) + sync_counter <= 0; + else + sync_counter <= sync_counter + 1; + + // must be greater than 1000, 1 less than a multiple of 10; + + time_sender time_sender + (.clk(clk),.rst(rst), + .vita_time(vita_time), + .send_sync(send_sync), + .exp_pps_out(exp_pps_out) ); + + time_receiver time_receiver + (.clk(clk),.rst(rst), + .vita_time(vita_time_rcvd), + .sync_rcvd(sync_rcvd), + .exp_pps_in(exp_pps_in) ); + endmodule // time_64bit -- cgit v1.2.3