----------------------------------------------------------------------------------
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----------------------------------------------------------------------------------
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-- Company:
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-- Company:
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-- Engineer: Peter Fall
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-- Engineer: Peter Fall
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--
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--
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-- Create Date: 12:00:04 05/31/2011
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-- Create Date: 12:00:04 05/31/2011
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-- Design Name:
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-- Design Name:
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-- Module Name: arp_rx - Behavioral
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-- Module Name: arp_rx - Behavioral
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-- Project Name:
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-- Project Name:
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-- Target Devices:
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-- Target Devices:
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-- Tool versions:
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-- Tool versions:
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-- Description:
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-- Description:
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-- handle receipt of arp pkt
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-- handle receipt of arp pkt
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-- ignores other types of pkt
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-- ignores other types of pkt
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--
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--
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-- When it receives an ARP pkt that is either addressed to our IP or is a global request,
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-- When it receives an ARP pkt that is either addressed to our IP or is a global request,
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-- it outputs for a single clock cycle either recv_who_has or recv_I_have along
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-- it outputs for a single clock cycle either recv_who_has or recv_I_have along
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-- with associated mac or arp entry data.
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-- with associated mac or arp entry data.
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--
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--
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-- Note that if recv who_has and we have it, then we also assert I_have so that we can cache the rev lookup
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-- Note that if recv who_has and we have it, then we also assert I_have so that we can cache the rev lookup
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-- on the expectation that we will want to reply to this host.
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-- on the expectation that we will want to reply to this host.
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--
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--
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-- Dependencies:
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-- Dependencies:
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--
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--
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-- Revision:
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-- Revision:
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-- Revision 0.01 - File Created - refactored from arp v0.02 module
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-- Revision 0.01 - File Created - refactored from arp v0.02 module
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-- Additional Comments:
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-- Additional Comments:
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--
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--
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----------------------------------------------------------------------------------
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----------------------------------------------------------------------------------
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library IEEE;
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library IEEE;
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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.NUMERIC_STD.ALL;
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use IEEE.NUMERIC_STD.ALL;
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use work.arp_types.all;
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use work.arp_types.all;
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entity arp_rx is
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entity arp_rx is
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Port (
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Port (
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-- MAC layer RX signals
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-- MAC layer RX signals
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data_in : in STD_LOGIC_VECTOR (7 downto 0); -- ethernet frame (from dst mac addr through to last byte of frame)
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data_in : in STD_LOGIC_VECTOR (7 downto 0); -- ethernet frame (from dst mac addr through to last byte of frame)
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data_in_valid : in STD_LOGIC; -- indicates data_in valid on clock
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data_in_valid : in STD_LOGIC; -- indicates data_in valid on clock
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data_in_last : in STD_LOGIC; -- indicates last data in frame
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data_in_last : in STD_LOGIC; -- indicates last data in frame
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-- ARP output signals
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-- ARP output signals
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recv_who_has : out std_logic; -- pulse will be latched
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recv_who_has : out std_logic; -- pulse will be latched
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arp_entry_for_who_has : out arp_entry_t; -- target for who_has msg (Iie, who to reply to)
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arp_entry_for_who_has : out arp_entry_t; -- target for who_has msg (Iie, who to reply to)
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recv_I_have : out std_logic; -- pulse will be latched
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recv_I_have : out std_logic; -- pulse will be latched
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arp_entry_for_I_have : out arp_entry_t; -- arp target for I_have msg
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arp_entry_for_I_have : out arp_entry_t; -- arp target for I_have msg
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-- control and status signals
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-- control and status signals
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req_count : out STD_LOGIC_VECTOR(7 downto 0); -- count of arp pkts received
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req_count : out STD_LOGIC_VECTOR(7 downto 0); -- count of arp pkts received
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-- system signals
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-- system signals
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our_ip_address : in STD_LOGIC_VECTOR (31 downto 0);
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our_ip_address : in STD_LOGIC_VECTOR (31 downto 0);
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rx_clk : in std_logic;
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rx_clk : in std_logic;
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reset : in STD_LOGIC
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reset : in STD_LOGIC
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);
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);
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end arp_rx;
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end arp_rx;
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architecture Behavioral of arp_rx is
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architecture Behavioral of arp_rx is
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type rx_state_t is (IDLE,PARSE,PROCESS_ARP,WAIT_END);
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type rx_state_t is (IDLE,PARSE,PROCESS_ARP,WAIT_END);
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type rx_event_t is (NO_EVENT,DATA);
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type rx_event_t is (NO_EVENT,DATA);
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type count_mode_t is (RST,INCR,HOLD);
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type count_mode_t is (RST,INCR,HOLD);
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type arp_oper_t is (NOP,REQUEST,REPLY);
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type arp_oper_t is (NOP,REQUEST,REPLY);
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type tx_state_type is (IDLE,WAIT_MAC,SEND);
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type tx_state_type is (IDLE,WAIT_MAC,SEND);
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-- state variables
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-- state variables
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signal send_request_needed : std_logic;
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signal send_request_needed : std_logic;
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signal tx_mac_chn_reqd : std_logic;
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signal tx_mac_chn_reqd : std_logic;
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signal rx_state : rx_state_t;
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signal rx_state : rx_state_t;
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signal rx_count : unsigned (7 downto 0);
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signal rx_count : unsigned (7 downto 0);
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signal arp_operation : arp_oper_t;
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signal arp_operation : arp_oper_t;
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signal arp_req_count : unsigned (7 downto 0);
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signal arp_req_count : unsigned (7 downto 0);
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signal new_arp_entry : arp_entry_t;
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signal new_arp_entry : arp_entry_t;
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-- FIXME - remove these debug state signals
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-- FIXME - remove these debug state signals
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signal arp_err_data : std_logic_vector (7 downto 0);
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signal arp_err_data : std_logic_vector (7 downto 0);
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signal set_err_data : std_logic;
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signal set_err_data : std_logic;
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attribute keep : string;
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attribute keep : string;
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attribute keep of arp_err_data : signal is "true";
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attribute keep of arp_err_data : signal is "true";
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-- rx control signals
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-- rx control signals
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signal next_rx_state : rx_state_t;
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signal next_rx_state : rx_state_t;
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signal set_rx_state : std_logic;
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signal set_rx_state : std_logic;
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signal rx_event : rx_event_t;
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signal rx_event : rx_event_t;
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signal rx_count_mode : count_mode_t;
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signal rx_count_mode : count_mode_t;
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signal set_arp_oper : std_logic;
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signal set_arp_oper : std_logic;
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signal arp_oper_set_val : arp_oper_t;
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signal arp_oper_set_val : arp_oper_t;
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signal dataval : std_logic_vector (7 downto 0);
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signal dataval : std_logic_vector (7 downto 0);
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signal count_arp_rcvd : std_logic;
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signal count_arp_rcvd : std_logic;
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signal set_mac5 : std_logic;
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signal set_mac5 : std_logic;
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signal set_mac4 : std_logic;
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signal set_mac4 : std_logic;
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signal set_mac3 : std_logic;
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signal set_mac3 : std_logic;
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signal set_mac2 : std_logic;
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signal set_mac2 : std_logic;
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signal set_mac1 : std_logic;
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signal set_mac1 : std_logic;
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signal set_mac0 : std_logic;
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signal set_mac0 : std_logic;
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signal set_ip3 : std_logic;
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signal set_ip3 : std_logic;
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signal set_ip2 : std_logic;
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signal set_ip2 : std_logic;
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signal set_ip1 : std_logic;
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signal set_ip1 : std_logic;
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signal set_ip0 : std_logic;
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signal set_ip0 : std_logic;
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-- function to determine whether the rx pkt is an arp pkt and whether we want to process it
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-- function to determine whether the rx pkt is an arp pkt and whether we want to process it
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-- Returns 1 if we should discard
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-- Returns 1 if we should discard
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-- The following will make us ignore the frame (all values hexadecimal):
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-- The following will make us ignore the frame (all values hexadecimal):
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-- PDU type /= 0806
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-- PDU type /= 0806
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-- Protocol Type /= 0800
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-- Protocol Type /= 0800
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-- Hardware Type /= 1
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-- Hardware Type /= 1
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-- Hardware Length /= 6
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-- Hardware Length /= 6
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-- Protocol Length /= 4
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-- Protocol Length /= 4
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-- Operation /= 1 or 2
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-- Operation /= 1 or 2
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-- Target IP /= our IP (i.er. message is not meant for us)
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-- Target IP /= our IP (i.er. message is not meant for us)
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--
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--
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function not_our_arp(data : STD_LOGIC_VECTOR; count : unsigned; our_ip : std_logic_vector) return std_logic is
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function not_our_arp(data : STD_LOGIC_VECTOR; count : unsigned; our_ip : std_logic_vector) return std_logic is
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begin
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begin
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if
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if
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(count = 12 and data /= x"08") or -- PDU type 0806 : ARP
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(count = 12 and data /= x"08") or -- PDU type 0806 : ARP
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(count = 13 and data /= x"06") or
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(count = 13 and data /= x"06") or
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(count = 14 and data /= x"00") or -- HW type 1 : eth
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(count = 14 and data /= x"00") or -- HW type 1 : eth
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(count = 15 and data /= x"01") or
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(count = 15 and data /= x"01") or
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(count = 16 and data /= x"08") or -- Protocol 0800 : IP
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(count = 16 and data /= x"08") or -- Protocol 0800 : IP
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(count = 17 and data /= x"00") or
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(count = 17 and data /= x"00") or
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(count = 18 and data /= x"06") or -- HW Length 6
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(count = 18 and data /= x"06") or -- HW Length 6
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(count = 19 and data /= x"04") or -- protocol length 4
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(count = 19 and data /= x"04") or -- protocol length 4
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(count = 20 and data /= x"00") or -- operation 1 or 2 (req or reply)
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(count = 20 and data /= x"00") or -- operation 1 or 2 (req or reply)
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(count = 21 and data /= x"01" and data /= x"02") or
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(count = 21 and data /= x"01" and data /= x"02") or
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(count = 38 and data /= our_ip(31 downto 24)) or -- target IP is ours
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(count = 38 and data /= our_ip(31 downto 24)) or -- target IP is ours
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(count = 39 and data /= our_ip(23 downto 16)) or
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(count = 39 and data /= our_ip(23 downto 16)) or
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(count = 40 and data /= our_ip(15 downto 8)) or
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(count = 40 and data /= our_ip(15 downto 8)) or
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(count = 41 and data /= our_ip(7 downto 0))
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(count = 41 and data /= our_ip(7 downto 0))
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then
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then
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return '1';
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return '1';
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else
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else
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return '0';
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return '0';
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end if;
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end if;
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end function not_our_arp;
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end function not_our_arp;
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begin
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begin
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rx_combinatorial : process (
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rx_combinatorial : process (
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-- input signals
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-- input signals
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data_in, data_in_valid, data_in_last, our_ip_address,
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data_in, data_in_valid, data_in_last, our_ip_address,
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-- state variables
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-- state variables
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rx_state, rx_count, arp_operation, arp_req_count, arp_err_data, new_arp_entry,
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rx_state, rx_count, arp_operation, arp_req_count, arp_err_data, new_arp_entry,
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-- control signals
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-- control signals
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next_rx_state, set_rx_state, rx_event, rx_count_mode, set_arp_oper, arp_oper_set_val,
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next_rx_state, set_rx_state, rx_event, rx_count_mode, set_arp_oper, arp_oper_set_val,
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dataval,set_mac5,set_mac4,set_mac3,set_mac2,set_mac1,set_mac0,set_ip3,set_ip2,set_ip1,set_ip0, set_err_data,
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dataval,set_mac5,set_mac4,set_mac3,set_mac2,set_mac1,set_mac0,set_ip3,set_ip2,set_ip1,set_ip0, set_err_data,
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count_arp_rcvd
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count_arp_rcvd
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)
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)
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begin
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begin
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-- set output followers
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-- set output followers
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req_count <= STD_LOGIC_VECTOR(arp_req_count);
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req_count <= STD_LOGIC_VECTOR(arp_req_count);
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-- set defaults for combinatorial outputs
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-- set defaults for combinatorial outputs
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recv_who_has <= '0';
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recv_who_has <= '0';
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arp_entry_for_who_has.ip <= (others => '0');
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arp_entry_for_who_has.ip <= (others => '0');
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arp_entry_for_who_has.mac <= (others => '0');
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arp_entry_for_who_has.mac <= (others => '0');
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recv_I_have <= '0';
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recv_I_have <= '0';
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arp_entry_for_I_have.ip <= (others => '0');
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arp_entry_for_I_have.ip <= (others => '0');
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arp_entry_for_I_have.mac <= (others => '0');
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arp_entry_for_I_have.mac <= (others => '0');
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-- set signal defaults
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-- set signal defaults
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next_rx_state <= IDLE;
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next_rx_state <= IDLE;
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set_rx_state <= '0';
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set_rx_state <= '0';
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rx_event <= NO_EVENT;
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rx_event <= NO_EVENT;
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rx_count_mode <= HOLD;
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rx_count_mode <= HOLD;
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set_arp_oper <= '0';
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set_arp_oper <= '0';
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arp_oper_set_val <= NOP;
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arp_oper_set_val <= NOP;
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dataval <= (others => '0');
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dataval <= (others => '0');
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set_mac5 <= '0';
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set_mac5 <= '0';
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set_mac4 <= '0';
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set_mac4 <= '0';
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set_mac3 <= '0';
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set_mac3 <= '0';
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set_mac2 <= '0';
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set_mac2 <= '0';
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set_mac1 <= '0';
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set_mac1 <= '0';
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set_mac0 <= '0';
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set_mac0 <= '0';
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set_ip3 <= '0';
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set_ip3 <= '0';
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set_ip2 <= '0';
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set_ip2 <= '0';
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set_ip1 <= '0';
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set_ip1 <= '0';
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set_ip0 <= '0';
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set_ip0 <= '0';
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count_arp_rcvd <= '0';
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count_arp_rcvd <= '0';
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set_err_data <= '0';
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set_err_data <= '0';
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-- determine event (if any)
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-- determine event (if any)
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if data_in_valid = '1' then
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if data_in_valid = '1' then
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rx_event <= DATA;
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rx_event <= DATA;
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end if;
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end if;
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-- RX FSM
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-- RX FSM
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case rx_state is
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case rx_state is
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when IDLE =>
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when IDLE =>
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rx_count_mode <= RST;
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rx_count_mode <= RST;
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case rx_event is
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case rx_event is
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when NO_EVENT => -- (nothing to do)
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when NO_EVENT => -- (nothing to do)
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when DATA =>
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when DATA =>
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next_rx_state <= PARSE;
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next_rx_state <= PARSE;
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set_rx_state <= '1';
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set_rx_state <= '1';
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rx_count_mode <= INCR;
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rx_count_mode <= INCR;
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end case;
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end case;
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when PARSE =>
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when PARSE =>
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case rx_event is
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case rx_event is
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when NO_EVENT => -- (nothing to do)
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when NO_EVENT => -- (nothing to do)
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when DATA =>
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when DATA =>
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rx_count_mode <= INCR;
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rx_count_mode <= INCR;
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-- handle early frame termination
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-- handle early frame termination
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if data_in_last = '1' then
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if data_in_last = '1' then
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next_rx_state <= IDLE;
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next_rx_state <= IDLE;
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set_rx_state <= '1';
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set_rx_state <= '1';
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else
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else
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-- check for end of frame. Also, detect and discard if not our frame
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-- check for end of frame. Also, detect and discard if not our frame
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if rx_count = 42 then
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if rx_count = 42 then
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next_rx_state <= PROCESS_ARP;
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next_rx_state <= PROCESS_ARP;
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set_rx_state <= '1';
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set_rx_state <= '1';
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elsif not_our_arp(data_in,rx_count,our_ip_address) = '1' then
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elsif not_our_arp(data_in,rx_count,our_ip_address) = '1' then
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dataval <= data_in;
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dataval <= data_in;
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set_err_data <= '1';
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set_err_data <= '1';
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next_rx_state <= WAIT_END;
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next_rx_state <= WAIT_END;
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set_rx_state <= '1';
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set_rx_state <= '1';
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elsif rx_count = 21 then
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elsif rx_count = 21 then
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-- capture ARP operation
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-- capture ARP operation
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case data_in is
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case data_in is
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when x"01" =>
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when x"01" =>
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arp_oper_set_val <= REQUEST;
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arp_oper_set_val <= REQUEST;
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set_arp_oper <= '1';
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set_arp_oper <= '1';
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when x"02" =>
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when x"02" =>
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arp_oper_set_val <= REPLY;
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arp_oper_set_val <= REPLY;
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set_arp_oper <= '1';
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set_arp_oper <= '1';
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when others => -- ignore other values
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when others => -- ignore other values
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end case;
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end case;
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-- capture source mac addr
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-- capture source mac addr
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elsif rx_count = 22 then
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elsif rx_count = 22 then
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set_mac5 <= '1';
|
set_mac5 <= '1';
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dataval <= data_in;
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dataval <= data_in;
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elsif rx_count = 23 then
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elsif rx_count = 23 then
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set_mac4 <= '1';
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set_mac4 <= '1';
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dataval <= data_in;
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dataval <= data_in;
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elsif rx_count = 24 then
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elsif rx_count = 24 then
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set_mac3 <= '1';
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set_mac3 <= '1';
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dataval <= data_in;
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dataval <= data_in;
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elsif rx_count = 25 then
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elsif rx_count = 25 then
|
set_mac2 <= '1';
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set_mac2 <= '1';
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dataval <= data_in;
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dataval <= data_in;
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elsif rx_count = 26 then
|
elsif rx_count = 26 then
|
set_mac1 <= '1';
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set_mac1 <= '1';
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dataval <= data_in;
|
dataval <= data_in;
|
elsif rx_count = 27 then
|
elsif rx_count = 27 then
|
set_mac0 <= '1';
|
set_mac0 <= '1';
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dataval <= data_in;
|
dataval <= data_in;
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-- capture source ip addr
|
-- capture source ip addr
|
elsif rx_count = 28 then
|
elsif rx_count = 28 then
|
set_ip3 <= '1';
|
set_ip3 <= '1';
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dataval <= data_in;
|
dataval <= data_in;
|
elsif rx_count = 29 then
|
elsif rx_count = 29 then
|
set_ip2 <= '1';
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set_ip2 <= '1';
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dataval <= data_in;
|
dataval <= data_in;
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elsif rx_count = 30 then
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elsif rx_count = 30 then
|
set_ip1 <= '1';
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set_ip1 <= '1';
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dataval <= data_in;
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dataval <= data_in;
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elsif rx_count = 31 then
|
elsif rx_count = 31 then
|
set_ip0 <= '1';
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set_ip0 <= '1';
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dataval <= data_in;
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dataval <= data_in;
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end if;
|
end if;
|
end if;
|
end if;
|
end case;
|
end case;
|
|
|
when PROCESS_ARP =>
|
when PROCESS_ARP =>
|
next_rx_state <= WAIT_END;
|
next_rx_state <= WAIT_END;
|
set_rx_state <= '1';
|
set_rx_state <= '1';
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arp_oper_set_val <= NOP;
|
arp_oper_set_val <= NOP;
|
set_arp_oper <= '1';
|
set_arp_oper <= '1';
|
case arp_operation is
|
case arp_operation is
|
when NOP => -- (nothing to do)
|
when NOP => -- (nothing to do)
|
when REQUEST =>
|
when REQUEST =>
|
count_arp_rcvd <= '1';
|
count_arp_rcvd <= '1';
|
recv_who_has <= '1';
|
recv_who_has <= '1';
|
arp_entry_for_who_has <= new_arp_entry;
|
arp_entry_for_who_has <= new_arp_entry;
|
-- setting I_Have as well allows us to cache the remote node's entry immediately
|
-- setting I_Have as well allows us to cache the remote node's entry immediately
|
recv_I_have <= '1';
|
recv_I_have <= '1';
|
arp_entry_for_I_have <= new_arp_entry;
|
arp_entry_for_I_have <= new_arp_entry;
|
when REPLY =>
|
when REPLY =>
|
count_arp_rcvd <= '1';
|
count_arp_rcvd <= '1';
|
recv_I_have <= '1';
|
recv_I_have <= '1';
|
arp_entry_for_I_have <= new_arp_entry;
|
arp_entry_for_I_have <= new_arp_entry;
|
end case;
|
end case;
|
|
|
when WAIT_END =>
|
when WAIT_END =>
|
case rx_event is
|
case rx_event is
|
when NO_EVENT => -- (nothing to do)
|
when NO_EVENT => -- (nothing to do)
|
when DATA =>
|
when DATA =>
|
if data_in_last = '1' then
|
if data_in_last = '1' then
|
next_rx_state <= IDLE;
|
next_rx_state <= IDLE;
|
set_rx_state <= '1';
|
set_rx_state <= '1';
|
end if;
|
end if;
|
end case;
|
end case;
|
|
|
end case;
|
end case;
|
|
|
end process;
|
end process;
|
|
|
rx_sequential : process (rx_clk)
|
rx_sequential : process (rx_clk)
|
begin
|
begin
|
if rising_edge(rx_clk) then
|
if rising_edge(rx_clk) then
|
if reset = '1' then
|
if reset = '1' then
|
-- reset state variables
|
-- reset state variables
|
rx_state <= IDLE;
|
rx_state <= IDLE;
|
rx_count <= x"00";
|
rx_count <= x"00";
|
arp_operation <= NOP;
|
arp_operation <= NOP;
|
arp_req_count <= x"00";
|
arp_req_count <= x"00";
|
arp_err_data <= (others => '0');
|
arp_err_data <= (others => '0');
|
else
|
else
|
-- Next rx_state processing
|
-- Next rx_state processing
|
if set_rx_state = '1' then
|
if set_rx_state = '1' then
|
rx_state <= next_rx_state;
|
rx_state <= next_rx_state;
|
else
|
else
|
rx_state <= rx_state;
|
rx_state <= rx_state;
|
end if;
|
end if;
|
|
|
-- rx_count processing
|
-- rx_count processing
|
case rx_count_mode is
|
case rx_count_mode is
|
when RST =>
|
when RST =>
|
rx_count <= x"00";
|
rx_count <= x"00";
|
when INCR =>
|
when INCR =>
|
rx_count <= rx_count + 1;
|
rx_count <= rx_count + 1;
|
when HOLD =>
|
when HOLD =>
|
rx_count <= rx_count;
|
rx_count <= rx_count;
|
end case;
|
end case;
|
|
|
-- err data
|
-- err data
|
if set_err_data = '1' then
|
if set_err_data = '1' then
|
arp_err_data <= data_in;
|
arp_err_data <= data_in;
|
else
|
else
|
arp_err_data <= arp_err_data;
|
arp_err_data <= arp_err_data;
|
end if;
|
end if;
|
|
|
-- arp operation processing
|
-- arp operation processing
|
if set_arp_oper = '1' then
|
if set_arp_oper = '1' then
|
arp_operation <= arp_oper_set_val;
|
arp_operation <= arp_oper_set_val;
|
else
|
else
|
arp_operation <= arp_operation;
|
arp_operation <= arp_operation;
|
end if;
|
end if;
|
|
|
-- source mac capture
|
-- source mac capture
|
if (set_mac5 = '1') then new_arp_entry.mac(47 downto 40) <= dataval; end if;
|
if (set_mac5 = '1') then new_arp_entry.mac(47 downto 40) <= dataval; end if;
|
if (set_mac4 = '1') then new_arp_entry.mac(39 downto 32) <= dataval; end if;
|
if (set_mac4 = '1') then new_arp_entry.mac(39 downto 32) <= dataval; end if;
|
if (set_mac3 = '1') then new_arp_entry.mac(31 downto 24) <= dataval; end if;
|
if (set_mac3 = '1') then new_arp_entry.mac(31 downto 24) <= dataval; end if;
|
if (set_mac2 = '1') then new_arp_entry.mac(23 downto 16) <= dataval; end if;
|
if (set_mac2 = '1') then new_arp_entry.mac(23 downto 16) <= dataval; end if;
|
if (set_mac1 = '1') then new_arp_entry.mac(15 downto 8) <= dataval; end if;
|
if (set_mac1 = '1') then new_arp_entry.mac(15 downto 8) <= dataval; end if;
|
if (set_mac0 = '1') then new_arp_entry.mac(7 downto 0) <= dataval; end if;
|
if (set_mac0 = '1') then new_arp_entry.mac(7 downto 0) <= dataval; end if;
|
|
|
-- source ip capture
|
-- source ip capture
|
if (set_ip3 = '1') then new_arp_entry.ip(31 downto 24) <= dataval; end if;
|
if (set_ip3 = '1') then new_arp_entry.ip(31 downto 24) <= dataval; end if;
|
if (set_ip2 = '1') then new_arp_entry.ip(23 downto 16) <= dataval; end if;
|
if (set_ip2 = '1') then new_arp_entry.ip(23 downto 16) <= dataval; end if;
|
if (set_ip1 = '1') then new_arp_entry.ip(15 downto 8) <= dataval; end if;
|
if (set_ip1 = '1') then new_arp_entry.ip(15 downto 8) <= dataval; end if;
|
if (set_ip0 = '1') then new_arp_entry.ip(7 downto 0) <= dataval; end if;
|
if (set_ip0 = '1') then new_arp_entry.ip(7 downto 0) <= dataval; end if;
|
|
|
-- set arp entry request
|
-- set arp entry request
|
if count_arp_rcvd = '1' then
|
if count_arp_rcvd = '1' then
|
-- count another ARP pkt received
|
-- count another ARP pkt received
|
arp_req_count <= arp_req_count + 1;
|
arp_req_count <= arp_req_count + 1;
|
else
|
else
|
arp_req_count <= arp_req_count;
|
arp_req_count <= arp_req_count;
|
end if;
|
end if;
|
|
|
end if;
|
end if;
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
end Behavioral;
|
end Behavioral;
|
|
|
|
|
