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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: 10/3/2010
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-- Design Name TosNet
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-- Module Name: app_net - Behavioral
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-- File Name: app_net.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 network discorvery module runs during startup, and
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-- performs network discovery. It is initiated by the master
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-- node, and polls all attached nodes for their node_ids which
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-- are stored together with the addresses of the nodes (that is,
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-- their position in the ring, relative to the master) in the
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-- network registers on 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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use work.commandpack.all;
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entity tdl_app_net 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 : in STD_LOGIC;
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app_dsc_done : out STD_LOGIC;
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app_network_reg_clk : out STD_LOGIC;
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app_network_reg_addr : out STD_LOGIC_VECTOR(5 downto 0);
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app_network_reg_data_in : in STD_LOGIC_VECTOR(7 downto 0);
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app_network_reg_data_out : out STD_LOGIC_VECTOR(7 downto 0);
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app_network_reg_we : inout STD_LOGIC_VECTOR(0 downto 0);
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app_node_count : out STD_LOGIC_VECTOR(3 downto 0);
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app_node_address : out STD_LOGIC_VECTOR(3 downto 0);
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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_net;
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architecture Behavioral of tdl_app_net is
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type STATES is (OFF, IDLE, CLEAR_NETWORKREG, DSC_SEND, DSC_RECEIVE, DSC_RESPOND, SET_SEND, SET_RECEIVE, SET_RESPOND, 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 node_count : STD_LOGIC_VECTOR(3 downto 0) := "0000";
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signal node_address : STD_LOGIC_VECTOR(3 downto 0) := "0000";
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signal nodes_received : STD_LOGIC_VECTOR(4 downto 0) := "00000";
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signal cmd_received : STD_LOGIC := '0';
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signal counter : STD_LOGIC_VECTOR(8 downto 0) := "000000000";
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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 <= "000000000";
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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_dsc_done <= '0';
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app_network_reg_clk <= '0';
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app_network_reg_addr <= "000000";
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app_network_reg_data_out <= "00000000";
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app_network_reg_we <= "0";
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last_data_in_strobe <= '0';
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node_count <= "0000";
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nodes_received <= "00000";
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cmd_received <= '0';
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node_address <= "0000";
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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_network_reg_clk <= '0';
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app_network_reg_we <= "0";
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when CLEAR_NETWORKREG =>
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app_network_reg_we <= "1";
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if(counter(0) = '0') then
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app_network_reg_clk <= '0';
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app_network_reg_addr <= counter(6 downto 1);
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app_network_reg_data_out <= "00000000";
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else
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app_network_reg_clk <= '1';
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end if;
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when DSC_SEND => --Send discovery packet (master only)
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if(counter(8 downto 1) = 0) then
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app_data_out_enable <= '1';
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app_data_out <= CMD_NET_DSC & "0001";
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app_data_out_strobe <= '1';
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elsif(counter(8 downto 1) = 1) then
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app_data_out_strobe <= '0';
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elsif(counter(8 downto 1) = 2) then
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app_data_out <= "0000" & app_node_id;
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app_data_out_strobe <= '1';
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else
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app_data_out_enable <= '0';
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app_data_out_strobe <= '0';
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end if;
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when DSC_RECEIVE => --Receive discovery packet
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if(app_data_in_strobe = '1' and last_data_in_strobe = '0') then
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if(node_count = 0 and app_data_in(7 downto 4) = CMD_NET_DSC and cmd_received = '0') then
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node_count <= app_data_in(3 downto 0);
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node_address <= app_data_in(3 downto 0);
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nodes_received <= "00000";
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cmd_received <= '1';
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else
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app_network_reg_addr <= nodes_received(3 downto 0) & "00";
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app_network_reg_data_out <= app_data_in;
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app_network_reg_we <= "1";
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app_network_reg_clk <= '0';
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nodes_received <= nodes_received + 1;
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end if;
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elsif(app_data_in_strobe = '0' and last_data_in_strobe = '1' and app_network_reg_we = "1") then
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app_network_reg_clk <= '1';
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else
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app_network_reg_clk <= '0';
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end if;
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when DSC_RESPOND => --Forward discovery packet (slave only)
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app_network_reg_we <= "0";
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if(counter(8 downto 1) = 0) then
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app_network_reg_clk <= '0';
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app_network_reg_addr <= counter(5 downto 2) & "00";
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app_data_out_enable <= '1';
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app_data_out_strobe <= '1';
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app_data_out <= CMD_NET_DSC & (node_count + 1);
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elsif(counter(5 downto 1) = node_count & '1') then
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app_data_out_strobe <= '0';
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elsif(counter(5 downto 1) = (node_count + 1) & '0') then
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app_data_out_strobe <= '1';
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app_data_out <= node_count & app_node_id;
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elsif(counter(5 downto 1) = (node_count + 1) & '1') then
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app_data_out_strobe <= '0';
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app_data_out_enable <= '0';
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node_count <= "0000"; --Reset node_count and nodes_received, as the combinatorial part doesn't work otherwise
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nodes_received <= "00000";
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cmd_received <= '0';
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elsif(counter(1) = '1') then
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app_data_out_strobe <= '0';
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app_network_reg_clk <= '1';
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else
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app_data_out_strobe <= '1';
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app_data_out <= app_network_reg_data_in;
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app_network_reg_clk <= '0';
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app_network_reg_addr <= counter(5 downto 2) & "00";
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end if;
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when SET_SEND => --Transmit set packet (master only)
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app_network_reg_we <= "0";
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if(counter(8 downto 1) = 0) then
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app_network_reg_clk <= '0';
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app_network_reg_addr <= counter(5 downto 2) & "00";
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app_data_out_enable <= '1';
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app_data_out_strobe <= '1';
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app_data_out <= CMD_NET_SET & node_count;
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elsif(counter(5 downto 1) = node_count & '1') then
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app_network_reg_clk <= '0';
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app_data_out_strobe <= '0';
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app_data_out_enable <= '0';
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node_count <= "0000"; --Reset node_count and nodes_received, as the combinatorial part doesn't work otherwise
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nodes_received <= "00000";
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cmd_received <= '0';
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elsif(counter(1) = '1') then
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app_data_out_strobe <= '0';
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app_network_reg_clk <= '1';
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else
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app_data_out_strobe <= '1';
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app_data_out <= app_network_reg_data_in;
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app_network_reg_clk <= '0';
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app_network_reg_addr <= counter(5 downto 2) & "00";
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end if;
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when SET_RECEIVE => --Receive set packet
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if(app_data_in_strobe = '1' and last_data_in_strobe = '0') then
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if(node_count = 0 and app_data_in(7 downto 4) = CMD_NET_SET and cmd_received = '0') then
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node_count <= app_data_in(3 downto 0);
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nodes_received <= "00000";
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cmd_received <= '1';
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else
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app_network_reg_addr <= nodes_received(3 downto 0) & "00";
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app_network_reg_data_out <= app_data_in;
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app_network_reg_we <= "1";
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app_network_reg_clk <= '0';
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nodes_received <= nodes_received + 1;
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end if;
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elsif(app_data_in_strobe = '0' and last_data_in_strobe = '1' and app_network_reg_we = "1") then
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app_network_reg_clk <= '1';
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else
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app_network_reg_clk <= '0';
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end if;
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when SET_RESPOND => --Forward set packet (slave only)
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app_network_reg_we <= "0";
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if(counter(8 downto 1) = 0) then
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app_network_reg_clk <= '0';
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app_network_reg_addr <= counter(5 downto 2) & "00";
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app_data_out_enable <= '1';
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app_data_out_strobe <= '1';
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app_data_out <= CMD_NET_SET & node_count;
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elsif(counter(5 downto 1) = node_count & '1') then
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app_network_reg_clk <= '0';
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app_data_out_strobe <= '0';
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app_data_out_enable <= '0';
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elsif(counter(1) = '1') then
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app_data_out_strobe <= '0';
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app_network_reg_clk <= '1';
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else
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app_data_out_strobe <= '1';
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app_data_out <= app_network_reg_data_in;
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app_network_reg_clk <= '0';
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app_network_reg_addr <= counter(5 downto 2) & "00";
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end if;
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when DONE => --Done!
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app_network_reg_we <= "0";
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if(app_is_master = '1') then
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app_node_address <= "0000";
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| 275 |
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else
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| 276 |
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app_node_address <= node_address;
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end if;
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| 278 |
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app_node_count <= node_count;
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| 279 |
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app_network_reg_clk <= '0';
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| 280 |
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app_network_reg_addr <= "000000";
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app_network_reg_data_out <= "00000000";
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| 282 |
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app_dsc_done <= '1';
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| 283 |
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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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| 288 |
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last_data_in_strobe <= app_data_in_strobe;
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| 291 |
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end if;
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| 292 |
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end process;
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| 293 |
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| 294 |
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| 295 |
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process(state, app_enable, app_data_in_strobe, counter, node_count, nodes_received, app_is_master)
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| 296 |
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begin
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| 297 |
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case state is
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| 298 |
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| 299 |
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when OFF =>
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| 300 |
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if(app_enable = '1') then
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| 301 |
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next_state <= IDLE;
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| 302 |
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else
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| 303 |
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next_state <= OFF;
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| 304 |
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end if;
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| 305 |
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| 306 |
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when IDLE =>
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| 307 |
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next_state <= CLEAR_NETWORKREG;
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| 308 |
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| 309 |
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when CLEAR_NETWORKREG =>
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| 310 |
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if(counter = 128) then
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| 311 |
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if(app_is_master = '1') then
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| 312 |
|
|
next_state <= DSC_SEND;
|
| 313 |
|
|
else
|
| 314 |
|
|
next_state <= DSC_RECEIVE;
|
| 315 |
|
|
end if;
|
| 316 |
|
|
else
|
| 317 |
|
|
next_state <= CLEAR_NETWORKREG;
|
| 318 |
|
|
end if;
|
| 319 |
|
|
|
| 320 |
|
|
when DSC_SEND =>
|
| 321 |
|
|
if(counter(8 downto 1) = 3) then
|
| 322 |
|
|
next_state <= DSC_RECEIVE;
|
| 323 |
|
|
else
|
| 324 |
|
|
next_state <= DSC_SEND;
|
| 325 |
|
|
end if;
|
| 326 |
|
|
|
| 327 |
|
|
when DSC_RECEIVE =>
|
| 328 |
|
|
next_state <= DSC_RECEIVE;
|
| 329 |
|
|
|
| 330 |
|
|
if((nodes_received = node_count) and not (node_count = 0) and (app_data_in_strobe = '0')) then
|
| 331 |
|
|
if(app_is_master = '0') then
|
| 332 |
|
|
next_state <= DSC_RESPOND;
|
| 333 |
|
|
else
|
| 334 |
|
|
next_state <= SET_SEND;
|
| 335 |
|
|
end if;
|
| 336 |
|
|
end if;
|
| 337 |
|
|
|
| 338 |
|
|
when DSC_RESPOND =>
|
| 339 |
|
|
if(counter(5 downto 1) = (node_count + 1) & '1') then
|
| 340 |
|
|
next_state <= SET_RECEIVE;
|
| 341 |
|
|
else
|
| 342 |
|
|
next_state <= DSC_RESPOND;
|
| 343 |
|
|
end if;
|
| 344 |
|
|
|
| 345 |
|
|
when SET_SEND =>
|
| 346 |
|
|
if(counter(5 downto 1) = node_count & '1') then
|
| 347 |
|
|
next_state <= SET_RECEIVE;
|
| 348 |
|
|
else
|
| 349 |
|
|
next_state <= SET_SEND;
|
| 350 |
|
|
end if;
|
| 351 |
|
|
|
| 352 |
|
|
when SET_RECEIVE =>
|
| 353 |
|
|
next_state <= SET_RECEIVE;
|
| 354 |
|
|
if((nodes_received = node_count) and not (node_count = 0) and (app_data_in_strobe = '0')) then
|
| 355 |
|
|
if(app_is_master = '0') then
|
| 356 |
|
|
next_state <= SET_RESPOND;
|
| 357 |
|
|
else
|
| 358 |
|
|
next_state <= DONE;
|
| 359 |
|
|
end if;
|
| 360 |
|
|
end if;
|
| 361 |
|
|
|
| 362 |
|
|
when SET_RESPOND =>
|
| 363 |
|
|
if(counter(5 downto 1) = node_count & '1') then
|
| 364 |
|
|
next_state <= DONE;
|
| 365 |
|
|
else
|
| 366 |
|
|
next_state <= SET_RESPOND;
|
| 367 |
|
|
end if;
|
| 368 |
|
|
|
| 369 |
|
|
when DONE =>
|
| 370 |
|
|
next_state <= DONE;
|
| 371 |
|
|
|
| 372 |
|
|
end case;
|
| 373 |
|
|
end process;
|
| 374 |
|
|
|
| 375 |
|
|
|
| 376 |
|
|
end Behavioral;
|
| 377 |
|
|
|
