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boa_a_m |
--****************************************************************************************
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library IEEE;
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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.std_logic_unsigned.all;
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library work;
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use work.signal_Package.all;
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library unisim;
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use unisim.vcomponents.all;
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entity ping_cheksum_calc is
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port
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(
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i_clk : in std_logic;
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i_reset : in std_logic;
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i_din : in std_logic_vector(7 downto 0);
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i_din_rdy : in std_logic;
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i_start_calc : in std_logic;
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i_stop_calc : in std_logic;
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o_checksum_valid : out std_logic;
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o_checksum : out std_logic_vector(15 downto 0)
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);
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end ping_cheksum_calc;
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architecture Behavioral of ping_cheksum_calc is
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--================================= Constant ===========================================================
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--Generate Block Conditional Constants
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constant c_GENERATE_PING_MODULE : boolean := true; --if Ping Block is not Used,Value is False
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constant c_GENERATE_ARP_MODULE : boolean := true; --if ARP Block is not Used,Value is False
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constant c_DEFAULT_DST_MAC_ADDR : std_logic_vector (47 downto 0) := x"F46D04962225"; --if ARP Block is not Used,Copy PC MAC Address to This Value
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--Application Layer Data Length
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constant c_PACKET_LENGTH : std_logic_vector (15 downto 0):= x"05c0"; --1472 (Maximum Application Layer Packet Length)
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constant c_udp_tx_src_ip : std_logic_vector (31 downto 0):= x"C0A86403"; --192.168.100.3(FPGA IP Adress)
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constant c_udp_tx_dst_ip : std_logic_vector (31 downto 0):= x"C0A86402"; --192.168.100.2(PC IP Address)
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constant c_udp_tx_protocol : std_logic_vector (7 downto 0) := x"11"; --UDP Protocol
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constant c_udp_tx_src_mac : std_logic_vector (47 downto 0):= x"112233445566"; --FPGA MAC Address
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constant c_udp_tx_checksum : std_logic_vector (15 downto 0):= x"0000"; --UDP Checksum(Value For This Constant is not Importanat)
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constant c_udp_tx_src_port : std_logic_vector (15 downto 0):= x"0401"; --UDP Src Port(Value For This Constant is not Importanat)
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constant c_udp_tx_dst_port : std_logic_vector (15 downto 0):= x"0FF5"; --UDP Dst Port(Value For This Constant is not Importanat)
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--ARP Constants
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constant c_TIME_OUT_LOOKUP_TABLE_ARP : std_logic_vector (31 downto 0) := x"9502F900"; --20S(Value/125MHz = 20 )
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constant c_TIME_OUT_WAIT_FOR_ARP_REPLY : std_logic_vector (31 downto 0) := x"07735940"; --1S (Value/125MHz = 1 )
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constant c_RE_SEND_ARP_REQUEST : std_logic_vector (3 downto 0) := x"A"; --10
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--IP Constants
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constant c_IP_TTL : std_logic_vector (7 downto 0) := x"80"; -- IP Packet Time to live
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constant c_IP_BC_ADDR : std_logic_vector (31 downto 0) := x"ffffffff"; -- Broadcast IP Address
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constant c_MAC_BC_ADDR : std_logic_vector (47 downto 0) := x"ffffffffffff"; -- Broadcast MAC Address
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--======================================================================================================
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--===================== Reset_gen Signals ==============================================================
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signal s_cnt_rst : std_logic_vector(15 downto 0):=(others=>'0');
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--======================================================================================================
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--================================ Ethernet 1g Signals =================================================
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signal s_gtx_clk : std_logic;
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signal s_tx_clk : std_logic;
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signal s_rx_clk : std_logic;
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signal s_rstn : std_logic;
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signal s_rx_reset : std_logic;
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signal s_tx_reset : std_logic;
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--mac to gmii_if signals
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signal s_mac_gmii_rxd : std_logic_vector(7 downto 0);
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signal s_mac_gmii_rx_dv : std_logic;
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signal s_mac_gmii_rx_er : std_logic;
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signal s_mac_gmii_txd : std_logic_vector(7 downto 0);
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signal s_mac_gmii_tx_en : std_logic;
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signal s_mac_gmii_tx_er : std_logic;
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--ip to mac signals
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signal s_mac_tx_tready : std_logic;
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signal s_mac_tx_tdata : std_logic_vector(7 downto 0);
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signal s_mac_tx_tvalid : std_logic;
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signal s_mac_tx_tlast : std_logic;
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signal s_mac_rx_tdata : std_logic_vector(7 downto 0);
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signal s_mac_rx_tvalid : std_logic;
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signal s_mac_rx_tlast : std_logic;
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--======================================================================================================
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--================================ UDP Signals =========================================================
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-------- for transfer Rx data from IP to UDP layer----------------
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signal s_ip_rx_dout : std_logic_vector(7 downto 0);
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signal s_ip_rx_dout_rdy : std_logic;
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signal s_ip_rx_dout_last : std_logic;
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-------- for transfer Rx status data from IP to UDP layer---------
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signal s_ip_rx_src_ip : std_logic_vector(31 downto 0);
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signal s_ip_rx_dst_ip : std_logic_vector(31 downto 0);
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signal s_ip_rx_data_len : std_logic_vector(15 downto 0);
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signal s_ip_rx_protocol : std_logic_vector(7 downto 0);
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signal s_ip_rx_broadcast : std_logic;
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signal s_ip_rx_err_out_udp : std_logic_vector (3 downto 0);
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signal s_ip_tx_err_out_udp : std_logic_vector (3 downto 0);
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signal s_arp_rx_err_out_udp : std_logic_vector (3 downto 0);
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-------- for transfer Tx data from UDP to IP layer---------------
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signal s_ip_tx_start : std_logic;
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signal s_ip_tx_rdy : std_logic;
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signal s_ip_tx_din : std_logic_vector(7 downto 0);
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-------- for transfer Tx header data from UDP to IP layer--------
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signal s_ip_tx_src_ip : std_logic_vector(31 downto 0);
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signal s_ip_tx_dst_ip : std_logic_vector(31 downto 0);
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signal s_ip_tx_src_mac : std_logic_vector(47 downto 0);
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signal s_ip_tx_data_len : std_logic_vector(15 downto 0);
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signal s_ip_tx_protocol : std_logic_vector(7 downto 0);
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-----------------------------------------------------------------
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--======================================================================================================
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--============================= IP Signals =============================================================
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signal s_ip_mac_tx_tvalid : std_logic;
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signal s_ip_mac_tx_tlast : std_logic;
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signal s_ip_mac_tx_tdata : std_logic_vector(7 downto 0);
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signal s_ip_mac_tx_req : std_logic;
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signal s_ip_mac_tx_granted : std_logic;
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signal s_arp_mac_tx_tvalid : std_logic;
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signal s_arp_mac_tx_tlast : std_logic;
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signal s_arp_mac_tx_tdata : std_logic_vector(7 downto 0);
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signal s_arp_mac_tx_req : std_logic;
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signal s_arp_mac_tx_granted : std_logic;
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signal s_ping_mac_tx_tvalid : std_logic;
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signal s_ping_mac_tx_tlast : std_logic;
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signal s_ping_mac_tx_tdata : std_logic_vector(7 downto 0);
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signal s_ping_mac_tx_req : std_logic;
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signal s_ping_mac_tx_granted : std_logic;
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signal s_lookup_req : std_logic;
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signal s_lookup_ip : std_logic_vector(31 downto 0);
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signal s_lookup_mac_addr : std_logic_vector(47 downto 0);
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signal s_lookup_mac_got : std_logic;
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signal s_lookup_mac_err : std_logic;
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signal s_no_ping_packet : std_logic;
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signal s_ip_rx_err_out : std_logic_vector(3 downto 0);
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--======================================================================================================
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--============================= IP4_TX Signals ==========================================================
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type t_tx_ip_state_type is (IDLE,WAIT_MAC_ADDR,WAIT_CHN,SEND_DATA);
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type t_crc_state_type is (IDLE, TOT_LEN, ID, FLAGS, TTL, CKS, SAH, SAL, DAH, DAL, ADDOVF, FINAL, WAIT_END);
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signal st_crc_state : t_crc_state_type:=IDLE;
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signal s_tx_hdr_cks : std_logic_vector (23 downto 0):=(others=>'0');
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signal s_cal_cheksum : std_logic:='0';
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signal st_tx_ip_state : t_tx_ip_state_type:=IDLE;
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signal s_cnt_ip_tx : std_logic_vector (15 downto 0):=(others=>'0');
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signal s_dst_mac_addr : std_logic_vector (47 downto 0); -- arp block updats this signal
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signal s_total_length : std_logic_vector (15 downto 0); -- s_total_length is i_data_length+20(ip header)
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signal s_ip_header : std_logic_vector (7 downto 0):=(others=>'0');
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--========================================================================================================
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--============================ IP4_RX Signals============================================================
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type t_rx_ip_state_type is (IDLE,ETH_H,IP_H,USER_DATA,WAIT_END);
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signal st_RX_IP_STATE : t_rx_ip_state_type:=IDLE;
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signal s_cnt_ip_rx : std_logic_vector (15 downto 0):=x"0001";
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signal s_src_ip_ip_rx : std_logic_vector (31 downto 0):=(others=>'0');
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signal s_dst_ip_ip_rx : std_logic_vector (31 downto 0):=(others=>'0');
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signal s_data_len_ip_rx : std_logic_vector (15 downto 0):=(others=>'0');
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signal s_protocol_ip_rx : std_logic_vector (7 downto 0) :=(others=>'0');
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signal s_broadcast_ip_rx : std_logic;
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--========================================================================================================
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--==================================== ARP Signals ==========================================================
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type t_arp_state_type is (IDLE,LOOK_UP,WAIT_PC_REPLY);
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signal st_ARP_STATE : t_arp_state_type:=IDLE;
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signal s_timeout_wait_reply_cnt : std_logic_vector(31 downto 0):=(others=>'0');
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signal s_error_cnt : std_logic_vector(3 downto 0):=(others=>'0');
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--ARP_TX Signals
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signal s_dst_ip_addr_pc : std_logic_vector(31 downto 0):=(others=>'0');
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signal s_dst_mac_addr_pc : std_logic_vector(47 downto 0):=(others=>'0');
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signal s_dst_ip_addr_lookup : std_logic_vector(31 downto 0):=(others=>'0');
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signal s_fpga_req_tx : std_logic:='0';
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signal s_pc_req_tx : std_logic:='0';
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--ARP_RX Signals
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signal s_ip_addr0 : std_logic_vector(31 downto 0);
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signal s_mac_addr0 : std_logic_vector(47 downto 0);
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signal s_addr_valid0 : std_logic;
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signal s_pc_reply_rx : std_logic;
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signal s_pc_req_rx : std_logic;
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--===========================================================================================================
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--=============================== ARP RX Signals ============================================================
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type t_rx_arp_state_type is (IDLE,ETH_H,ARP_DATA,WAIT_END);
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signal st_RX_ARP_STATE : t_rx_arp_state_type:=IDLE;
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signal s_cnt_arp_rx : std_logic_vector (15 downto 0):=x"0001";
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signal s_dst_ip : std_logic_vector (31 downto 0):=(others=>'0');
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signal s_operation : std_logic_vector (15 downto 0):=(others=>'0');
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signal s_addr_valid : std_logic:='0';
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signal s_pc_req : std_logic:='0';
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signal s_pc_reply : std_logic:='0';
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signal s_src_mac_arp_rx : std_logic_vector (47 downto 0):=(others=>'0');
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signal s_src_ip_arp_rx : std_logic_vector (31 downto 0):=(others=>'0');
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signal s_addr_valid_pulse : std_logic:='0';
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signal s_pc_req_pulse : std_logic:='0';
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signal s_pc_reply_pulse : std_logic:='0';
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signal s_trans_data_pulse : std_logic:='0';
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--===========================================================================================================
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--=================================== ARP LOOKUP_TABLE Signals ==============================================
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signal s_timeout_lookup_table_cnt : std_logic_vector(31 downto 0):=(others=>'0');
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signal s_din : std_logic_vector(82 downto 0):=(others=>'0');
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signal s_wr_en : std_logic;
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signal s_dout : std_logic_vector(82 downto 0):=(others=>'0');
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signal s_valid : std_logic;
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signal s_empty : std_logic;
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signal s_notempty : std_logic;
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signal s_mac_addr_out : std_logic_vector(47 downto 0):=(others=>'0');
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signal s_ip_addr_out : std_logic_vector(31 downto 0):=(others=>'0');
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signal s_addr_valid_out : std_logic:='0';
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signal s_request_out : std_logic:='0';
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signal s_reply_out : std_logic:='0';
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--============================================================================================================
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--============================ ARP TX Signals ================================================================
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type t_arp_tx_state_type is (IDLE,WAIT_CHN,SEND_DATA);
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signal st_tx_arp_state : t_arp_tx_state_type:=IDLE;
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signal s_cnt_arp_tx : std_logic_vector (7 downto 0):=(others=>'0');
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signal s_arp_type : std_logic_vector (15 downto 0):=(others=>'0');
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signal s_dst_ip_addr : std_logic_vector (31 downto 0):=(others=>'0');
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signal s_dst_mac_addr1 : std_logic_vector (47 downto 0):=(others=>'0');
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signal s_dst_mac_addr2 : std_logic_vector (47 downto 0):=(others=>'0');
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--============================================================================================================
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|
324 |
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|
325 |
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|
326 |
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|
327 |
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|
328 |
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--============================== PING Signals =================================================================
|
329 |
|
|
--for Delayed Inputs
|
330 |
|
|
signal s_mac_data_in_r : std_logic_vector (7 downto 0);
|
331 |
|
|
signal s_mac_data_in_valid_r : std_logic;
|
332 |
|
|
signal s_mac_data_in_last_r : std_logic;
|
333 |
|
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|
334 |
|
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|
335 |
|
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--Sync_fifo_ping Signals
|
336 |
|
|
signal s_ip_rx_in : std_logic_vector(14 downto 0);
|
337 |
|
|
signal s_ip_rx_out : std_logic_vector(14 downto 0):=(others=>'0');
|
338 |
|
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signal s_mac_data_in : std_logic_vector(7 downto 0);
|
339 |
|
|
signal s_mac_data_in_valid : std_logic;
|
340 |
|
|
signal s_mac_data_in_last : std_logic;
|
341 |
|
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signal s_mac_data_in_last_d : std_logic;
|
342 |
|
|
signal s_ip_rx_err_in : std_logic_vector(3 downto 0);
|
343 |
|
|
signal s_no_ping_data : std_logic;
|
344 |
|
|
signal s_empty_sync_fifo : std_logic:='0';
|
345 |
|
|
signal s_not_empty_sync_fifo: std_logic;
|
346 |
|
|
|
347 |
|
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|
348 |
|
|
--Data_fifo_ping Signals
|
349 |
|
|
signal s_rst_fifo_ping : std_logic:='1';
|
350 |
|
|
signal s_wr_en_fifo_ping : std_logic:='0';
|
351 |
|
|
signal s_din_fifo_ping : std_logic_vector(7 downto 0):=(others=>'0');
|
352 |
|
|
signal s_rd_en_fifo_ping : std_logic;
|
353 |
|
|
signal s_dout_fifo_ping : std_logic_vector(7 downto 0);
|
354 |
|
|
|
355 |
|
|
|
356 |
|
|
--Checksum Signals
|
357 |
|
|
signal s_checksum_data_out : std_logic_vector(15 downto 0);
|
358 |
|
|
signal s_checksum_data_in : std_logic_vector(7 downto 0);
|
359 |
|
|
signal s_checksum_start_calc : std_logic:='0';
|
360 |
|
|
signal s_checksum_stop_calc : std_logic:='0';
|
361 |
|
|
|
362 |
|
|
|
363 |
|
|
--st_PING_STATE Machine Process Signals
|
364 |
|
|
type t_ping_state is (IDLE,ACQUIRE_DATA,WAIT_END,WAIT_CHN,SEND_DATA);
|
365 |
|
|
signal st_PING_STATE : t_ping_state:=IDLE;
|
366 |
|
|
signal s_wr_cnt : std_logic_vector(7 downto 0):=(others=>'0');
|
367 |
|
|
signal s_rd_cnt : std_logic_vector(7 downto 0):=(others=>'0');
|
368 |
|
|
signal s_start_send : std_logic;
|
369 |
|
|
|
370 |
|
|
|
371 |
|
|
signal s_src_mac_ping : std_logic_vector(47 downto 0):=(others=>'0');
|
372 |
|
|
signal s_dst_mac_ping : std_logic_vector(47 downto 0):=(others=>'0');
|
373 |
|
|
signal s_src_ip_ping : std_logic_vector(31 downto 0):=(others=>'0');
|
374 |
|
|
signal s_dst_ip_ping : std_logic_vector(31 downto 0):=(others=>'0');
|
375 |
|
|
--=================================================================================================================
|
376 |
|
|
|
377 |
|
|
|
378 |
|
|
|
379 |
|
|
|
380 |
|
|
|
381 |
|
|
|
382 |
|
|
|
383 |
|
|
|
384 |
|
|
|
385 |
|
|
|
386 |
|
|
|
387 |
|
|
|
388 |
|
|
--================================= Ping Checksum Calc Signals ====================================================
|
389 |
|
|
type t_checksum_state is (IDLE,CALC);
|
390 |
|
|
signal st_checksum_state : t_checksum_state:=IDLE;
|
391 |
|
|
|
392 |
|
|
signal s_flag : std_logic:='0';
|
393 |
|
|
signal s_din_r : std_logic_vector(7 downto 0);
|
394 |
|
|
signal s_sum : std_logic_vector(31 downto 0):=(others=>'0');
|
395 |
|
|
--=================================================================================================================
|
396 |
|
|
|
397 |
|
|
|
398 |
|
|
|
399 |
|
|
|
400 |
|
|
|
401 |
|
|
|
402 |
|
|
|
403 |
|
|
|
404 |
|
|
|
405 |
|
|
|
406 |
|
|
|
407 |
|
|
--============================ TX_Arbitior Signals =====================================================================
|
408 |
|
|
type t_state_type is (IDLE,DATA_REQ,ARP_REQ,PING_REQ);
|
409 |
|
|
signal st_STATE : t_state_type:=IDLE;
|
410 |
|
|
--======================================================================================================================
|
411 |
|
|
|
412 |
|
|
|
413 |
|
|
|
414 |
|
|
|
415 |
|
|
|
416 |
|
|
|
417 |
|
|
|
418 |
|
|
|
419 |
|
|
|
420 |
|
|
|
421 |
|
|
|
422 |
|
|
|
423 |
|
|
--============================ UDP RX Signals ===========================================================================
|
424 |
|
|
type t_rx_udp_state_type is (IDLE, UDP_HDR, USER_DATA, WAIT_END);
|
425 |
|
|
signal st_RX_UDP_STATE : t_rx_udp_state_type:=IDLE;
|
426 |
|
|
signal s_cnt_udp_rx : std_logic_vector (15 downto 0):=x"0001";
|
427 |
|
|
|
428 |
|
|
signal s_src_ip_udp_rx : std_logic_vector (31 downto 0):=(others=>'0');
|
429 |
|
|
signal s_src_port : std_logic_vector (15 downto 0):=(others=>'0');
|
430 |
|
|
signal s_dst_port : std_logic_vector (15 downto 0):=(others=>'0');
|
431 |
|
|
signal s_data_len_udp_rx : std_logic_vector (15 downto 0):=(others=>'0');
|
432 |
|
|
signal s_err_out : std_logic_vector (3 downto 0) :=(others=>'0');
|
433 |
|
|
--=======================================================================================================================
|
434 |
|
|
|
435 |
|
|
|
436 |
|
|
|
437 |
|
|
|
438 |
|
|
|
439 |
|
|
|
440 |
|
|
|
441 |
|
|
|
442 |
|
|
|
443 |
|
|
|
444 |
|
|
|
445 |
|
|
--============================ UDP TX Signals =============================================================================
|
446 |
|
|
type t_tx_udp_state_type is (IDLE,SEND_DATA);
|
447 |
|
|
signal st_tx_udp_state : t_tx_udp_state_type:=IDLE;
|
448 |
|
|
|
449 |
|
|
signal s_cnt_udp_tx : std_logic_vector (15 downto 0):=(others=>'0');
|
450 |
|
|
signal s_ip_data_len : std_logic_vector (15 downto 0);
|
451 |
|
|
signal s_udp_header : std_logic_vector (7 downto 0):=(others=>'0');
|
452 |
|
|
--==========================================================================================================================
|
453 |
|
|
|
454 |
|
|
|
455 |
|
|
|
456 |
|
|
|
457 |
|
|
|
458 |
|
|
|
459 |
|
|
|
460 |
|
|
|
461 |
|
|
|
462 |
|
|
|
463 |
|
|
|
464 |
|
|
--============================ PHY_Interface Signals =======================================================================
|
465 |
|
|
signal s_gmii_col_reg : std_logic;
|
466 |
|
|
signal s_gmii_col_reg_reg : std_logic;
|
467 |
|
|
signal s_gmii_rx_clk : std_logic;
|
468 |
|
|
--==========================================================================================================================
|
469 |
|
|
|
470 |
|
|
|
471 |
|
|
|
472 |
|
|
|
473 |
|
|
|
474 |
|
|
|
475 |
|
|
|
476 |
|
|
|
477 |
|
|
|
478 |
|
|
|
479 |
|
|
|
480 |
|
|
--=========================== Ping_Pong Fifo Signals =======================================================================
|
481 |
|
|
signal s_empty1 : std_logic;
|
482 |
|
|
signal s_empty2 : std_logic;
|
483 |
|
|
signal s_notempty1 : std_logic;
|
484 |
|
|
signal s_notempty2 : std_logic;
|
485 |
|
|
|
486 |
|
|
|
487 |
|
|
signal s_data_m : std_logic_vector(7 downto 0);
|
488 |
|
|
signal s_valid_m : std_logic;
|
489 |
|
|
signal s_last_m : std_logic;
|
490 |
|
|
|
491 |
|
|
|
492 |
|
|
signal s_wr_en_a : std_logic:='0';
|
493 |
|
|
signal s_din_a : std_logic_vector(7 downto 0):=(others=>'0');
|
494 |
|
|
signal s_rd_en_a : std_logic;
|
495 |
|
|
signal s_dout_a : std_logic_vector(7 downto 0);
|
496 |
|
|
signal s_valid_a : std_logic;
|
497 |
|
|
signal s_empty_a : std_logic;
|
498 |
|
|
|
499 |
|
|
signal s_wr_en_b : std_logic:='0';
|
500 |
|
|
signal s_din_b : std_logic_vector(7 downto 0):=(others=>'0');
|
501 |
|
|
signal s_rd_en_b : std_logic;
|
502 |
|
|
signal s_dout_b : std_logic_vector(7 downto 0);
|
503 |
|
|
signal s_valid_b : std_logic;
|
504 |
|
|
signal s_empty_b : std_logic;
|
505 |
|
|
|
506 |
|
|
|
507 |
|
|
signal s_cnt_a : std_logic_vector(15 downto 0):=(others=>'0');
|
508 |
|
|
signal s_cnt_b : std_logic_vector(15 downto 0):=(others=>'0');
|
509 |
|
|
signal s_rd_cnt_a : std_logic_vector(15 downto 0):=(others=>'0');
|
510 |
|
|
signal s_rd_cnt_b : std_logic_vector(15 downto 0):=(others=>'0');
|
511 |
|
|
|
512 |
|
|
signal s_busy_a : std_logic:='0';
|
513 |
|
|
signal s_busy_b : std_logic:='0';
|
514 |
|
|
|
515 |
|
|
signal s_last_a : std_logic:='0';
|
516 |
|
|
signal s_last_b : std_logic:='0';
|
517 |
|
|
|
518 |
|
|
signal s_dout_len : std_logic_vector(15 downto 0);
|
519 |
|
|
|
520 |
|
|
type t_pingpong_state is (wait_data,rd_fifo_a,rd_fifo_b);
|
521 |
|
|
signal st_ping_pong_state : t_pingpong_state:=wait_data;
|
522 |
|
|
--=========================================================================================================================
|
523 |
|
|
|
524 |
|
|
|
525 |
|
|
begin
|
526 |
|
|
|
527 |
|
|
--==================== Ping Checksum Calculator ==========================================================
|
528 |
|
|
p_checksum_calculator:process(i_clk)
|
529 |
|
|
begin
|
530 |
|
|
if rising_edge(i_clk) then
|
531 |
|
|
if (i_reset='1') then
|
532 |
|
|
st_checksum_state <= IDLE;
|
533 |
|
|
s_flag <= '0';
|
534 |
|
|
s_sum <= (others=>'0');
|
535 |
|
|
o_checksum_valid <= '0';
|
536 |
|
|
o_checksum <= (others=>'0');
|
537 |
|
|
else
|
538 |
|
|
case st_checksum_state is
|
539 |
|
|
|
540 |
|
|
WHEN IDLE =>
|
541 |
|
|
s_flag <= '0';
|
542 |
|
|
if (i_start_calc='1') then
|
543 |
|
|
s_sum <= (others=>'0');
|
544 |
|
|
o_checksum_valid <= '0';
|
545 |
|
|
o_checksum <= (others=>'0');
|
546 |
|
|
st_checksum_state <= CALC;
|
547 |
|
|
end if;
|
548 |
|
|
|
549 |
|
|
WHEN CALC =>
|
550 |
|
|
if (i_din_rdy='1') then
|
551 |
|
|
s_din_r <= i_din;
|
552 |
|
|
s_flag <= not s_flag;
|
553 |
|
|
if (s_flag='1') then
|
554 |
|
|
s_sum <= s_sum+(x"0000" & s_din_r & i_din);
|
555 |
|
|
end if;
|
556 |
|
|
end if;
|
557 |
|
|
if (i_stop_calc='1') then
|
558 |
|
|
o_checksum <= not(s_sum(31 downto 16) + s_sum(15 downto 0));
|
559 |
|
|
o_checksum_valid <= '1';
|
560 |
|
|
st_checksum_state <= IDLE;
|
561 |
|
|
end if;
|
562 |
|
|
|
563 |
|
|
END CASE;
|
564 |
|
|
end if;
|
565 |
|
|
end if;
|
566 |
|
|
end process p_checksum_calculator;
|
567 |
|
|
--========================================================================================================
|
568 |
|
|
|
569 |
|
|
end Behavioral;
|