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Line 17... |
--
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--
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-- Revision:
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-- Revision:
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-- Revision 0.01 - File Created
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-- Revision 0.01 - File Created
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-- Revision 0.02 - fixed up setting of tx_result control defaults
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-- Revision 0.02 - fixed up setting of tx_result control defaults
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-- Revision 0.03 - Added data_out_first
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-- Revision 0.03 - Added data_out_first
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-- Revision 0.04 - Added handling of broadcast address
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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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| Line 92... |
Line 93... |
-- tx control signals
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-- tx control signals
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signal next_tx_state : tx_state_type;
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signal next_tx_state : tx_state_type;
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signal set_tx_state : std_logic;
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signal set_tx_state : std_logic;
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signal next_tx_result : std_logic_vector (1 downto 0);
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signal next_tx_result : std_logic_vector (1 downto 0);
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signal set_tx_result : std_logic;
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signal set_tx_result : std_logic;
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signal tx_mac_value : std_logic_vector (47 downto 0);
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signal set_tx_mac : std_logic;
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signal set_tx_mac : std_logic;
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signal tx_count_val : unsigned (11 downto 0);
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signal tx_count_val : unsigned (11 downto 0);
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signal tx_count_mode : settable_cnt_type;
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signal tx_count_mode : settable_cnt_type;
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signal tx_data : std_logic_vector (7 downto 0);
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signal tx_data : std_logic_vector (7 downto 0);
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signal set_last : std_logic;
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signal set_last : std_logic;
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Line 163... |
mac_tx_granted, mac_data_out_ready,
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mac_tx_granted, mac_data_out_ready,
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-- state variables
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-- state variables
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tx_state, tx_count, tx_result_reg, tx_mac, tx_mac_chn_reqd,
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tx_state, tx_count, tx_result_reg, tx_mac, tx_mac_chn_reqd,
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mac_lookup_req, tx_hdr_cks, arp_req_ip_reg, mac_data_out_ready_reg,
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mac_lookup_req, tx_hdr_cks, arp_req_ip_reg, mac_data_out_ready_reg,
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-- control signals
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-- control signals
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next_tx_state, set_tx_state, next_tx_result, set_tx_result, set_tx_mac, tx_count_mode,
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next_tx_state, set_tx_state, next_tx_result, set_tx_result, tx_mac_value, set_tx_mac, tx_count_mode,
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tx_data, set_last, set_chn_reqd, set_mac_lku_req, total_length,
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tx_data, set_last, set_chn_reqd, set_mac_lku_req, total_length,
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tx_data_valid, tx_count_val
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tx_data_valid, tx_count_val
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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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Line 208... |
set_chn_reqd <= HOLD;
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set_chn_reqd <= HOLD;
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set_mac_lku_req <= HOLD;
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set_mac_lku_req <= HOLD;
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next_tx_result <= IPTX_RESULT_NONE;
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next_tx_result <= IPTX_RESULT_NONE;
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set_tx_result <= '0';
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set_tx_result <= '0';
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tx_count_val <= (others => '0');
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tx_count_val <= (others => '0');
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tx_mac_value <= (others => '0');
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-- set temp signals
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-- set temp signals
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total_length <= std_logic_vector(unsigned(ip_tx.hdr.data_length) + 20); -- total length = user data length + header length (bytes)
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total_length <= std_logic_vector(unsigned(ip_tx.hdr.data_length) + 20); -- total length = user data length + header length (bytes)
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-- TX FSM
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-- TX FSM
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-- check header count for error if too high
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-- check header count for error if too high
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if unsigned(ip_tx.hdr.data_length) > 1480 then
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if unsigned(ip_tx.hdr.data_length) > 1480 then
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next_tx_result <= IPTX_RESULT_ERR;
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next_tx_result <= IPTX_RESULT_ERR;
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set_tx_result <= '1';
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set_tx_result <= '1';
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else
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else
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next_tx_result <= IPTX_RESULT_SENDING;
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set_tx_result <= '1';
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-- TODO - check if we already have the mac addr for this ip, if so, bypass the WAIT_MAC state
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-- TODO - check if we already have the mac addr for this ip, if so, bypass the WAIT_MAC state
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-- req the mac address for this ip
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if ip_tx.hdr.dst_ip_addr = IP_BC_ADDR then
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-- for IP broadcast, dont need to look up the MAC addr
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tx_mac_value <= MAC_BC_ADDR;
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set_tx_mac <= '1';
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next_tx_state <= WAIT_CHN;
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set_tx_state <= '1';
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else
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-- need to req the mac address for this ip
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set_mac_lku_req <= SET;
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set_mac_lku_req <= SET;
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next_tx_result <= IPTX_RESULT_SENDING;
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set_tx_result <= '1';
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next_tx_state <= WAIT_MAC;
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next_tx_state <= WAIT_MAC;
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set_tx_state <= '1';
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set_tx_state <= '1';
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end if;
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end if;
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end if;
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else
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else
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set_mac_lku_req <= CLR;
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set_mac_lku_req <= CLR;
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end if;
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end if;
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when WAIT_MAC =>
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when WAIT_MAC =>
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ip_tx_data_out_ready <= '0'; -- in this state, we are unable to accept user data for tx
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ip_tx_data_out_ready <= '0'; -- in this state, we are unable to accept user data for tx
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if arp_req_rslt.got_mac = '1' then
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if arp_req_rslt.got_mac = '1' then
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-- save the MAC we got back from the ARP lookup
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-- save the MAC we got back from the ARP lookup
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tx_mac_value <= arp_req_rslt.mac;
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set_tx_mac <= '1';
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set_tx_mac <= '1';
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set_chn_reqd <= SET;
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set_chn_reqd <= SET;
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set_mac_lku_req <= CLR;
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set_mac_lku_req <= CLR;
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-- check for optimise when already have the channel
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-- check for optimise when already have the channel
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if mac_tx_granted = '1' then
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if mac_tx_granted = '1' then
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Line 436... |
arp_req_ip_reg <= arp_req_ip_reg;
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arp_req_ip_reg <= arp_req_ip_reg;
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end case;
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end case;
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-- save MAC
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-- save MAC
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if set_tx_mac = '1' then
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if set_tx_mac = '1' then
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tx_mac <= arp_req_rslt.mac;
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tx_mac <= tx_mac_value;
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else
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else
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tx_mac <= tx_mac;
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tx_mac <= tx_mac;
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end if;
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end if;
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-- control access request to mac tx chn
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-- control access request to mac tx chn
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