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-- TimeGenAdvancedTrigger.vhd
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------------------------------------------------------------------------------
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-- This file is a part of the LPP VHDL IP LIBRARY
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-- Copyright (C) 2009 - 2016, Laboratory of Plasmas Physic - CNRS
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Alexis Jeandet
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-- Mail : alexis.jeandet@lpp.polytechnique.fr
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-------------------------------------------------------------------------------
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LIBRARY IEEE;
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USE IEEE.numeric_std.ALL;
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USE IEEE.std_logic_1164.ALL;
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ENTITY TimeGenAdvancedTrigger IS
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PORT(
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clk : IN STD_LOGIC;
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rstn : IN STD_LOGIC;
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SPW_Tickout : IN STD_LOGIC;
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CoarseTime : IN STD_LOGIC_VECTOR(31 DOWNTO 0);
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FineTime : IN STD_LOGIC_VECTOR(15 DOWNTO 0);
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TrigPeriod : IN STD_LOGIC_VECTOR(3 DOWNTO 0); -- In seconds 0 to 15
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TrigShift : IN STD_LOGIC_VECTOR(15 DOWNTO 0); -- In FineTime steps
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Restart : IN STD_LOGIC;
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StartDate : IN STD_LOGIC_VECTOR(31 DOWNTO 0); -- Date in seconds since epoch
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BypassTickout : IN STD_LOGIC; -- if set then Trigger output is driven by SPW tickout
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-- else Trigger output is driven by advanced trig
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Trigger : OUT STD_LOGIC
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);
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END TimeGenAdvancedTrigger;
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ARCHITECTURE beh OF TimeGenAdvancedTrigger IS
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SIGNAL AdvancedTrigger : STD_LOGIC:='0';
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SIGNAL AdvancedTrigger_l0 : STD_LOGIC:='0';
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SIGNAL AdvancedTrigger_l1 : STD_LOGIC:='0';
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SIGNAL started : STD_LOGIC:='0';
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SIGNAL periodCntr : STD_LOGIC_VECTOR(3 DOWNTO 0):=(OTHERS=>'0');
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SIGNAL coarseTime0 : STD_LOGIC:='0';
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BEGIN
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Trigger <= SPW_Tickout WHEN BypassTickout = '1' ELSE AdvancedTrigger;
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AdvancedTrigger <= AdvancedTrigger_l0 AND AdvancedTrigger_l1;
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PROCESS(clk,rstn)
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BEGIN
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IF rstn = '0' THEN
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started <= '0';
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AdvancedTrigger_l0 <='0';
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AdvancedTrigger_l1 <='0';
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coarseTime0 <= '0';
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periodCntr <= (OTHERS => '0');
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ELSIF clk'event AND clk = '1' THEN
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coarseTime0 <= CoarseTime(0);
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-- Detection of start date and handling of Restart
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IF Restart = '1' THEN
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started <= '0';
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ELSIF StartDate = CoarseTime THEN
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started <= '1';
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END IF;
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-- Fine time based comparator for phase shift
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IF TrigShift = FineTime THEN
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AdvancedTrigger_l0 <='1';
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ELSE
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AdvancedTrigger_l0 <='0';
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END IF;
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-- Second filter, generates a pulse for each N seconds since StartDate
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IF started = '1' THEN
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IF periodCntr = "0000" THEN
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AdvancedTrigger_l1 <='1';
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periodCntr <= TrigPeriod;
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ELSIF CoarseTime(0) /= coarseTime0 THEN
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periodCntr <= STD_LOGIC_VECTOR(SIGNED(periodCntr) - 1);
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AdvancedTrigger_l1 <='0';
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END IF;
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ELSE
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periodCntr <= (OTHERS => '0');
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AdvancedTrigger_l1 <='0';
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END IF;
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END IF;
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END PROCESS;
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END beh;
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