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mac: Add MAC RX

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This commit is contained in:
Markus Koch 2021-08-30 13:27:30 +02:00
parent 76301f0a97
commit 3775dc336b
2 changed files with 286 additions and 0 deletions
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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.bench_pkg.all;
library trashernet;
use trashernet.trashernet_types.all;
entity bench_trashernet_mac is
end entity bench_trashernet_mac;
architecture bench of bench_trashernet_mac is
signal clk : std_logic;
signal phy_clk : std_logic;
signal rst : std_logic;
signal rx_data : std_logic_vector(7 downto 0);
signal rx_data_valid : std_logic;
signal rx_active : std_logic;
signal tx_data : std_logic_vector(7 downto 0);
signal tx_data_en : std_logic;
signal tx_data_ack : std_logic;
signal carrier_detect : std_logic;
signal rx_error : std_logic;
signal rx_p : std_logic;
signal tx_p : std_logic;
signal rx_mac_destination : mac_addr_t;
signal rx_mac_source : mac_addr_t;
signal rx_mac_ethertype : ethertype_t;
signal rx_mac_data : byte;
signal rx_mac_valid : std_logic;
signal rx_mac_crc_ok : std_logic;
signal rx_mac_crc_error : std_logic;
begin
trashernet_phy_cdc_inst : entity trashernet.trashernet_phy_cdc
generic map(
F_CLK => 49000000,
F_CLK_PHY => 100000000
)
port map(
clk => clk,
phy_clk => phy_clk,
rst => rst,
rx_data => rx_data,
rx_data_valid => rx_data_valid,
rx_active => rx_active,
tx_data => tx_data,
tx_data_en => tx_data_en,
tx_data_ack => tx_data_ack,
carrier_detect => carrier_detect,
rx_error => rx_error,
rx_p => rx_p,
tx_p => tx_p
);
trashernet_mac_inst : entity trashernet.trashernet_mac
port map(
clk => clk,
rst => rst,
rx_data => rx_data,
rx_data_valid => rx_data_valid,
rx_active => rx_active,
tx_data => tx_data,
tx_data_en => tx_data_en,
tx_data_ack => tx_data_ack,
carrier_detect => carrier_detect,
rx_error => rx_error,
rx_mac_destination => rx_mac_destination,
rx_mac_source => rx_mac_source,
rx_mac_ethertype => rx_mac_ethertype,
rx_mac_data => rx_mac_data,
rx_mac_valid => rx_mac_valid,
rx_mac_crc_ok => rx_mac_crc_ok,
rx_mac_crc_error => rx_mac_crc_error
);
clock_driver : process
constant period : time := 20 ns;
begin
clk <= '0';
wait for period / 2;
clk <= '1';
wait for period / 2;
end process clock_driver;
phy_clock_driver : process
constant period : time := 10 ns;
begin
phy_clk <= '0';
wait for period / 2;
phy_clk <= '1';
wait for period / 2;
end process phy_clock_driver;
test : process is
begin
rx_p <= '0';
rst <= '1';
wait for 20 ns;
rst <= '0';
wait for 20 ns;
send_data(rx_p, byte_vector'(
x"55", x"55", x"55", x"D5",
x"11", x"22", x"33", x"44", x"55", x"66", x"00", x"e0", x"4c", x"36", x"00", x"2f", x"08", x"00", x"45", x"00", x"00", x"54", x"fe", x"22", x"40", x"00", x"40", x"01", x"f5", x"28", x"c0", x"a8", x"63", x"0a", x"c0", x"a8", x"63", x"02", x"08", x"00", x"90", x"e6", x"00", x"06", x"00", x"01", x"da", x"bd", x"2c", x"61", x"00", x"00", x"00", x"00", x"9f", x"20", x"02", x"00", x"00", x"00", x"00", x"00", x"10", x"11", x"12", x"13", x"14", x"15", x"16", x"17", x"18", x"19", x"1a", x"1b", x"1c", x"1d", x"1e", x"1f", x"20", x"21", x"22", x"23", x"24", x"25", x"26", x"27", x"28", x"29", x"2a", x"2b", x"2c", x"2d", x"2e", x"2f", x"30", x"31", x"32", x"33", x"34", x"35", x"36", x"37",
x"e9", x"f2", x"6b", x"30"
));
send_data(rx_p, byte_vector'(
x"55", x"55", x"55", x"D5",
x"11", x"22", x"33", x"44", x"55", x"66", x"00", x"e0", x"4c", x"36", x"00", x"2f", x"08", x"00", x"45", x"00", x"00", x"54", x"ca", x"78", x"40", x"00", x"40", x"01", x"28", x"d4", x"c0", x"a8", x"63", x"0a", x"c0", x"a8", x"63", x"01", x"08", x"00", x"93", x"f5", x"00", x"03", x"00", x"01", x"3c", x"bc", x"2c", x"61", x"00", x"00", x"00", x"00", x"38", x"16", x"04", x"00", x"00", x"00", x"00", x"00", x"10", x"11", x"12", x"13", x"14", x"15", x"16", x"17", x"18", x"19", x"1a", x"1b", x"1c", x"1d", x"1e", x"1f", x"20", x"21", x"22", x"23", x"24", x"25", x"26", x"27", x"28", x"29", x"2a", x"2b", x"2c", x"2d", x"2e", x"2f", x"30", x"31", x"32", x"33", x"34", x"35", x"36", x"37",
x"b9", x"7f", x"c7", x"91"
));
send_data(rx_p, byte_vector'(
x"55", x"55", x"55", x"D5",
x"12", x"34", x"56", x"78", x"90", x"12",
x"AB", x"CD", x"EF", x"AA", x"BB", x"CC",
x"08", x"00",
x"11", x"22", x"33", x"44", x"55", x"66",
x"CC", x"2C", x"CC", x"2C"
));
wait;
end process test;
receiver : process is
begin
wait until rising_edge(clk);
if rx_data_valid then
report "[PHY] RX byte: " & to_hstring(rx_data);
end if;
if rx_mac_valid then
report "[MAC] RX byte: " & to_hstring(rx_mac_data);
end if;
if rx_mac_crc_ok then
report "[MAC] RX CRC OK";
end if;
if rx_mac_crc_error then
report "[MAC] RX CRC error";
end if;
end process receiver;
end architecture bench;

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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.trashernet_types.all;
entity trashernet_mac is
port(
-- Global
clk : in std_logic; -- Global clock
rst : in std_logic; -- Asynchronous reset
-- PHY signals
rx_data : in std_logic_vector(7 downto 0); -- RX Data
rx_data_valid : in std_logic; -- RX Data valid
rx_active : in std_logic; -- RX of packet in progress
tx_data : out std_logic_vector(7 downto 0); -- TX Data
tx_data_en : out std_logic; -- Transmitter enable
tx_data_ack : in std_logic; -- Latched data_tx
carrier_detect : in std_logic; -- Carrier detected
rx_error : in std_logic; -- Receive error
-- MAC signals
rx_mac_destination : out mac_addr_t; -- Destination MAC address
rx_mac_source : out mac_addr_t; -- Source MAC address
rx_mac_ethertype : out ethertype_t; -- Ethertype or length
rx_mac_data : out byte; -- Ethernet data (after Ethertype)
rx_mac_valid : out std_logic; -- `rx_mac` values (headers + data) are valid
rx_mac_header_rcv : out std_logic; -- `rx_mac` header have been received and are valid
rx_mac_crc_ok : out std_logic; -- End of packet, CRC OK (strobe independent from other rx_mac fields)
rx_mac_crc_error : out std_logic -- End of packet, CRC invalid
);
end entity trashernet_mac;
architecture rtl of trashernet_mac is
signal crc : std_logic_vector(31 downto 0);
signal crc_ok : std_logic;
signal crc_clear : std_logic;
begin
rx : block
type state_t is (HEAD, PAYLOAD);
constant HEAD_LENGTH : integer := rx_mac_destination'length + rx_mac_source'length + rx_mac_ethertype'length;
constant CRC_LENGTH : integer := 4;
signal state : state_t;
signal sr_head : byte_vector(0 to HEAD_LENGTH - 1);
constant BYTE_COUNT_MAX : integer := maximum(HEAD_LENGTH, CRC_LENGTH) - 1;
signal byte_count : integer range 0 to BYTE_COUNT_MAX;
signal sr_payload : byte_vector(0 to 4);
constant ETH_POLYNOMIAL : std_logic_vector(crc'range) := x"04C11DB7";
begin
crc_inst : entity work.crc
generic map(
POLYNOMIAL => ETH_POLYNOMIAL,
START => x"FFFFFFFF",
FINAL_XOR => x"FFFFFFFF",
REVERSE_OUT => true
)
port map(
clk => clk,
rst => rst,
data => rx_data,
data_valid => rx_data_valid,
crc_clear => crc_clear,
crc_out => crc
);
crc_ok <= '1' when crc = x"2144DF1C" else '0';
main : process(clk, rst) is
begin
if rst then
byte_count <= 0;
rx_mac_valid <= '0';
rx_mac_crc_error <= '0';
rx_mac_crc_ok <= '0';
rx_mac_header_rcv <= '0';
crc_clear <= '0';
elsif rising_edge(clk) then
rx_mac_valid <= '0';
rx_mac_crc_error <= '0';
rx_mac_crc_ok <= '0';
rx_mac_header_rcv <= '0';
crc_clear <= '0';
case state is
when HEAD =>
if rx_data_valid then
sr_head <= sr_head(sr_head'low + 1 to sr_head'high) & rx_data;
if byte_count = (HEAD_LENGTH - 1) then
state <= PAYLOAD;
byte_count <= 0;
rx_mac_header_rcv <= '1';
end if;
if (byte_count /= BYTE_COUNT_MAX) then
byte_count <= byte_count + 1;
end if;
end if;
when PAYLOAD =>
if rx_data_valid then
sr_payload <= sr_payload(sr_payload'low + 1 to sr_payload'high) & rx_data;
if byte_count = CRC_LENGTH then
rx_mac_valid <= '1';
else
byte_count <= byte_count + 1;
end if;
end if;
if not rx_active then
rx_mac_crc_ok <= crc_ok;
rx_mac_crc_error <= not crc_ok;
end if;
if rx_error then
rx_mac_crc_error <= '1';
end if;
end case;
if (not rx_active) or rx_error then
byte_count <= 0;
state <= HEAD;
crc_clear <= '1';
end if;
end if;
end process main;
rx_mac_destination <= sr_head(0 to 5);
rx_mac_source <= sr_head(6 to 11);
rx_mac_ethertype <= sr_head(12 to 13);
rx_mac_data <= sr_payload(0);
end block rx;
end architecture rtl;