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//
// Copyright 2011 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/>.
//
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 reg [63:0] vita_time_pps,
output pps_int,
input exp_time_in, output exp_time_out,
output reg good_sync,
output [31:0] debug
);
localparam NEXT_SECS = 0;
localparam NEXT_TICKS = 1;
localparam PPS_POLSRC = 2;
localparam PPS_IMM = 3;
localparam TPS = 4;
localparam MIMO_SYNC = 5;
reg [31:0] seconds, ticks;
wire end_of_second;
assign vita_time = {seconds,ticks};
wire [63:0] vita_time_rcvd;
wire [31:0] next_ticks_preset, next_seconds_preset;
wire [31:0] ticks_per_sec_reg;
wire set_on_pps_trig;
reg set_on_next_pps;
wire pps_polarity, pps_source, set_imm;
reg [1:0] pps_del;
reg pps_reg_p, pps_reg_n, pps_reg;
wire pps_edge;
reg [15:0] sync_counter;
wire sync_rcvd;
wire [31:0] mimo_secs, mimo_ticks;
wire mimo_sync_now;
wire mimo_sync;
wire [7:0] sync_delay;
setting_reg #(.my_addr(BASE+NEXT_TICKS)) sr_next_ticks
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(next_ticks_preset),.changed());
setting_reg #(.my_addr(BASE+NEXT_SECS)) sr_next_secs
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(next_seconds_preset),.changed(set_on_pps_trig));
setting_reg #(.my_addr(BASE+PPS_POLSRC), .width(2)) sr_pps_polsrc
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out({pps_source,pps_polarity}),.changed());
setting_reg #(.my_addr(BASE+PPS_IMM), .width(1)) sr_pps_imm
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(set_imm),.changed());
setting_reg #(.my_addr(BASE+TPS), .at_reset(TICKS_PER_SEC)) sr_tps
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(ticks_per_sec_reg),.changed());
setting_reg #(.my_addr(BASE+MIMO_SYNC), .at_reset(0), .width(9)) sr_mimosync
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out({mimo_sync,sync_delay}),.changed());
always @(posedge clk) pps_reg_p <= pps;
always @(negedge clk) pps_reg_n <= pps;
always @* pps_reg <= pps_polarity ? pps_reg_p : pps_reg_n;
always @(posedge clk)
if(rst)
pps_del <= 2'b00;
else
pps_del <= {pps_del[0],pps_reg};
assign pps_edge = pps_del[0] & ~pps_del[1];
always @(posedge clk)
if(pps_edge)
vita_time_pps <= vita_time;
always @(posedge clk)
if(rst)
set_on_next_pps <= 0;
else if(set_on_pps_trig)
set_on_next_pps <= 1;
else if(set_imm | pps_edge)
set_on_next_pps <= 0;
wire [31:0] ticks_plus_one = ticks + 1;
always @(posedge clk)
if(rst)
begin
seconds <= 32'd0;
ticks <= 32'd0;
end
else if((set_imm | pps_edge) & set_on_next_pps)
begin
seconds <= next_seconds_preset;
ticks <= next_ticks_preset;
end
else if(mimo_sync_now)
begin
seconds <= mimo_secs;
ticks <= mimo_ticks;
end
else if(ticks_plus_one == ticks_per_sec_reg)
begin
seconds <= seconds + 1;
ticks <= 0;
end
else
ticks <= ticks_plus_one;
assign pps_int = pps_edge;
// MIMO Connector Time Sync
wire send_sync = (sync_counter == 59999); // X % 10 = 9
always @(posedge clk)
if(rst)
sync_counter <= 0;
else
if(send_sync)
sync_counter <= 0;
else
sync_counter <= sync_counter + 1;
time_sender time_sender
(.clk(clk),.rst(rst),
.vita_time(vita_time),
.send_sync(send_sync),
.exp_time_out(exp_time_out) );
time_receiver time_receiver
(.clk(clk),.rst(rst),
.vita_time(vita_time_rcvd),
.sync_rcvd(sync_rcvd),
.exp_time_in(exp_time_in) );
assign mimo_secs = vita_time_rcvd[63:32];
assign mimo_ticks = vita_time_rcvd[31:0] + {16'd0,sync_delay};
//assign mimo_sync_now = mimo_sync & sync_rcvd & (mimo_ticks <= TICKS_PER_SEC);
// for timing purposes, assume sync_delay less than 10k
assign mimo_sync_now = mimo_sync & sync_rcvd & (vita_time_rcvd <= (TICKS_PER_SEC-10000));
assign debug = { { 24'b0} ,
{ 2'b0, exp_time_in, exp_time_out, mimo_sync, mimo_sync_now, sync_rcvd, send_sync} };
always @(posedge clk)
if(rst)
good_sync <= 0;
else if(sync_rcvd)
good_sync <= 1;
endmodule // time_64bit
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