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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: 11/5/2010
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-- Design Name TosNet
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-- Module Name: app_master - Behavioral
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-- File Name: app_master.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 master discovery module performs master discovery and
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-- setup during startup. The node with the lowest node_id is
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-- designated as the master, and transmits this information to
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-- all other nodes in the network.
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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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use work.commandpack.all;
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entity tdl_app_master 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_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 : in STD_LOGIC;
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app_is_master : out 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_clk : in STD_LOGIC;
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app_reset : in STD_LOGIC);
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end tdl_app_master;
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architecture Behavioral of tdl_app_master is
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type STATES is (OFF, IDLE, DSC, CMP, SET, SET_RESPOND, WAIT_FOR_SET, DONE);
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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_strobe : STD_LOGIC;
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signal lowest_current_id : STD_LOGIC_VECTOR(3 downto 0);
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signal counter : STD_LOGIC_VECTOR(2 downto 0) := "000";
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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(app_buffer_full = '1') then
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counter <= counter;
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elsif(state = next_state) then
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counter <= counter + 1;
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else
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counter <= "000";
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end if;
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case state is
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when OFF =>
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app_data_out_enable <= '0';
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app_data_out_strobe <= '0';
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app_data_out <= "00000000";
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app_force_packet_error <= 'Z';
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app_is_master <= '0';
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app_dsc_done <= '0';
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last_data_in_strobe <= '0';
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lowest_current_id <= app_node_id;
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when IDLE =>
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app_data_out_enable <= '0';
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app_data_out_strobe <= '0';
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app_dsc_done <= '0';
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app_is_master <= '0';
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when DSC => --Transmit discovery packet
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app_data_out_enable <= '1';
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app_data_out <= CMD_MASTER_DSC & lowest_current_id;
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app_data_out_strobe <= '1';
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when CMP => --Compare received packets to lowest known id
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app_data_out_enable <= '0';
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app_data_out_strobe <= '0';
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if(app_data_in_strobe = '1' and last_data_in_strobe = '0' and app_cmd_valid = '1') then
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if(app_data_in(7 downto 4) = CMD_MASTER_DSC) then
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if(app_data_in(3 downto 0) = app_node_id) then
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app_is_master <= '1';
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elsif(app_data_in(3 downto 0) < app_node_id) then
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lowest_current_id <= app_data_in(3 downto 0);
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end if;
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end if;
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end if;
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when SET => --Transmit set packet (master only)
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app_data_out_enable <= '1';
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app_data_out <= CMD_MASTER_SET & lowest_current_id;
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app_data_out_strobe <= '1';
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when SET_RESPOND => --Forward set packet (slave only)
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app_data_out_enable <= '1';
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app_data_out <= app_data_in(7 downto 0);
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app_data_out_strobe <= '1';
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when WAIT_FOR_SET => --Wait until set is received again (master only)
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app_data_out_enable <= '0';
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app_data_out_strobe <= '0';
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when DONE => --Done!
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app_dsc_done <= '1';
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app_data_out_enable <= '0';
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app_data_out_strobe <= '0';
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app_data_out <= "00000000";
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app_force_packet_error <= 'Z';
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end case;
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last_data_in_strobe <= app_data_in_strobe;
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end if;
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end process;
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process(state, app_enable, app_data_in, app_data_in_strobe, last_data_in_strobe, app_node_id, app_cmd_valid)
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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 <= IDLE;
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else
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next_state <= OFF;
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end if;
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when IDLE =>
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next_state <= DSC;
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when DSC =>
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next_state <= CMP;
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when CMP =>
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next_state <= CMP;
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if(app_data_in_strobe = '1' and last_data_in_strobe = '0' and app_cmd_valid = '1') then
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if(app_data_in(7 downto 4) = CMD_MASTER_DSC) then
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if(app_data_in(3 downto 0) = app_node_id) then
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next_state <= SET;
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else
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next_state <= DSC;
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end if;
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elsif(app_data_in(7 downto 4) = CMD_MASTER_SET) then
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if(app_data_in(3 downto 0) > app_node_id) then --Make a quick sanity check on the received master node id, if it is larger than the id of this node, then something is wrong...
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next_state <= IDLE;
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else
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next_state <= SET_RESPOND;
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end if;
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end if;
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end if;
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when SET =>
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next_state <= WAIT_FOR_SET;
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when SET_RESPOND =>
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next_state <= DONE;
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when WAIT_FOR_SET =>
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next_state <= WAIT_FOR_SET;
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if(app_data_in_strobe = '1' and last_data_in_strobe = '0' and app_cmd_valid = '1') then
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if(app_data_in(7 downto 4) = CMD_MASTER_SET) then
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next_state <= DONE;
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end if;
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end if;
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when DONE =>
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next_state <= DONE;
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end case;
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end process;
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end Behavioral;
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