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sonicwave |
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-- Company: University of Southern Denmark
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-- Engineer: Simon Falsig
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--
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-- Create Date: 7/3/2010
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-- Design Name TosNet
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-- Module Name: app_sync - Behavioral
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-- File Name: app_sync.vhd
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-- Project Name: TosNet
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-- Target Devices: Spartan3/6
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-- Tool versions: Xilinx ISE 12.2
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-- Description: The synchronization module handles the synchronization strobes
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-- that are emitted at the end of each cycle. The strobe is
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-- delayed for a fixed interval, depending on the node address
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-- (which specifies the position of the node in the network
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-- relative to the master), which causes the strobe to be emitted
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-- at the same time in all nodes.
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--
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-- Revision:
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-- Revision 3.2 - Initial release
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--
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-- Copyright 2010
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--
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-- This module is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Lesser 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 module 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 Lesser General Public License for more details.
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--
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-- You should have received a copy of the GNU Lesser General Public License
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-- along with this module. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------------------------------------------------
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library IEEE;
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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.STD_LOGIC_ARITH.ALL;
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use IEEE.STD_LOGIC_UNSIGNED.ALL;
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---- Uncomment the following library declaration if instantiating
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---- any Xilinx primitives in this code.
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--library UNISIM;
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--use UNISIM.VComponents.all;
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entity tdl_app_sync is
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Port ( app_enable : in STD_LOGIC;
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app_data_in : in STD_LOGIC_VECTOR(7 downto 0);
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app_data_in_strobe : in STD_LOGIC;
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app_data_in_enable : in STD_LOGIC;
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app_data_out : out STD_LOGIC_VECTOR(7 downto 0);
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app_data_out_strobe : out STD_LOGIC;
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app_data_out_enable : out STD_LOGIC;
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app_buffer_full : in STD_LOGIC;
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app_packet_error : in STD_LOGIC;
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app_force_packet_error : out STD_LOGIC;
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app_cmd_valid : in STD_LOGIC;
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app_sync_strobe : out STD_LOGIC;
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app_is_master : in STD_LOGIC;
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app_dsc_done : out STD_LOGIC;
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app_node_id : in STD_LOGIC_VECTOR(3 downto 0);
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app_node_count : in STD_LOGIC_VECTOR(3 downto 0);
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app_node_address : in STD_LOGIC_VECTOR(3 downto 0);
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app_clk : in STD_LOGIC;
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app_reset : in STD_LOGIC);
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end tdl_app_sync;
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architecture Behavioral of tdl_app_sync is
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type STATES is (OFF, CALC_SYNC_DELAY, SYNC_READY, SYNC_ONLINE, SYNC_RUNNING, SYNC_SET);
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signal state : STATES := OFF;
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signal next_state : STATES := OFF;
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signal last_data_in_enable : STD_LOGIC;
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signal counter : STD_LOGIC_VECTOR(4 downto 0) := "00000";
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signal delay_counter : STD_LOGIC_VECTOR(11 downto 0) := "000000000000";
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signal delay_current_node : STD_LOGIC_VECTOR(11 downto 0) := "000000000000";
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constant delay_pr_node : STD_LOGIC_VECTOR(11 downto 0) := "000100101100";
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begin
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process(app_clk)
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begin
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if(app_clk = '1' and app_clk'EVENT) then
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if(app_reset = '1') then
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state <= OFF;
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else
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state <= next_state;
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end if;
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if(state = next_state) then
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counter <= counter + 1;
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else
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counter <= "00000";
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end if;
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case state is
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when OFF =>
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delay_counter <= "000000000000";
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delay_current_node <= "000000000000";
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app_dsc_done <= '0';
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last_data_in_enable <= '0';
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app_sync_strobe <= '0';
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when CALC_SYNC_DELAY =>
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if(app_is_master = '1') then
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delay_current_node <= "000000000000";
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elsif(counter = 0) then
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delay_current_node <= delay_pr_node;
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else
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delay_current_node <= delay_current_node + delay_pr_node;
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end if;
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when SYNC_READY =>
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if(app_is_master = '1') then
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app_sync_strobe <= '1'; --If this is the master node, send out a single sync pulse to get the application started...
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end if;
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when SYNC_ONLINE =>
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app_dsc_done <= '1';
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app_sync_strobe <= '0';
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delay_counter <= "000000000000";
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when SYNC_RUNNING =>
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delay_counter <= delay_counter + 1;
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when SYNC_SET =>
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app_sync_strobe <= '1';
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end case;
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last_data_in_enable <= app_data_in_enable;
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end if;
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end process;
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process(state, app_enable, counter, app_node_count, app_node_address, delay_counter, delay_current_node, app_data_in_enable, last_data_in_enable)
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begin
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case state is
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when OFF =>
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if(app_enable = '1') then
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next_state <= CALC_SYNC_DELAY;
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else
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next_state <= OFF;
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end if;
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when CALC_SYNC_DELAY =>
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if(counter = app_node_count - app_node_address - 1) then
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next_state <= SYNC_READY;
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else
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next_state <= CALC_SYNC_DELAY;
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end if;
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when SYNC_READY => --Make sure that the current transmission is done before going online (if not the enable signal from the received sync_set will trigger the sync mechanism... which is kinda not what we want)
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if(app_data_in_enable = '0') then
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next_state <= SYNC_ONLINE;
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else
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next_state <= SYNC_READY;
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end if;
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when SYNC_ONLINE =>
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if(app_data_in_enable = '0' and last_data_in_enable = '1') then
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next_state <= SYNC_RUNNING;
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else
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next_state <= SYNC_ONLINE;
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end if;
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when SYNC_RUNNING =>
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if(app_data_in_enable = '1') then --If app_data_in_enable goes high before the sync_strobe something bad is happening - but let's just make sure we don't make it worse by sending a sync_strobe in the middle of a (probably erroneous) transmission...
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next_state <= SYNC_ONLINE;
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elsif(delay_counter = delay_current_node) then
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next_state <= SYNC_SET;
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else
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next_state <= SYNC_RUNNING;
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end if;
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when SYNC_SET =>
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next_state <= SYNC_ONLINE;
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end case;
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end process;
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end Behavioral;
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