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mac: Use records for header fields

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This commit is contained in:
Markus Koch 2021-09-25 11:20:26 +02:00
parent 9addd97b57
commit cf6fb61195
3 changed files with 70 additions and 76 deletions
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22
bench/bench_trashernet_mac.vhd
View File

@ -32,26 +32,22 @@ architecture bench of bench_trashernet_mac is
signal tx_data_en : std_logic;
signal tx_data_ack : std_logic;
signal tx_active : std_logic;
signal tx_header : mac_header_fields;
signal carrier_detect : std_logic;
signal rx_error : std_logic;
signal rx_p : std_logic;
signal tx_p : std_logic;
signal tx_n : 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;
signal rx_mac_header_rcv : std_logic;
signal tx_mac_destination : mac_addr_t;
signal tx_mac_source : mac_addr_t;
signal tx_mac_ethertype : ethertype_t;
signal tx_mac_data : byte;
signal tx_mac_data_en : std_logic;
signal tx_mac_data_ack : std_logic;
signal rx_header : mac_header_fields;
constant TEST_BENCH_LOOPBACK : boolean := true;
@ -92,17 +88,13 @@ begin
tx_active => tx_active,
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_header => rx_header,
rx_mac_data => rx_mac_data,
rx_mac_valid => rx_mac_valid,
rx_mac_header_rcv => rx_mac_header_rcv,
rx_mac_crc_ok => rx_mac_crc_ok,
rx_mac_crc_error => rx_mac_crc_error,
tx_mac_destination => tx_mac_destination,
tx_mac_source => tx_mac_source,
tx_mac_ethertype => tx_mac_ethertype,
tx_header => tx_header,
tx_mac_data => tx_mac_data,
tx_mac_data_en => tx_mac_data_en,
tx_mac_data_ack => tx_mac_data_ack
@ -189,9 +181,9 @@ begin
mac_tx : process is
begin
tx_mac_data <= x"11";
tx_mac_destination <= (x"12", x"23", x"34", x"45", x"56", x"67");
tx_mac_source <= (x"a2", x"a3", x"a4", x"a5", x"a6", x"a7");
tx_mac_ethertype <= (x"01", x"00");
tx_header.mac_destination <= (x"12", x"23", x"34", x"45", x"56", x"67");
tx_header.mac_source <= (x"a2", x"a3", x"a4", x"a5", x"a6", x"a7");
tx_header.mac_ethertype <= (x"01", x"00");
tx_mac_data_en <= '0';
wait until rst = '0';

22
trashernet/trashernet_mac.vhd
View File

@ -35,18 +35,14 @@ entity trashernet_mac is
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_header : out mac_header_fields; -- RX MAC Header Data
rx_mac_header_rcv : out std_logic; -- `rx_mac` header have been received and are valid
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
tx_mac_destination : in mac_addr_t; -- Destination MAC address
tx_mac_source : in mac_addr_t; -- Source MAC address
tx_mac_ethertype : in ethertype_t; -- Ethertype or length
tx_header : in mac_header_fields; -- TX MAC Header Data
tx_mac_data : in byte; -- Payload
tx_mac_data_en : in std_logic; -- Start (and keep) transmitting a frame
tx_mac_data_ack : out std_logic -- The byte on `tx_mac_data` has been latched. Update to next word.
@ -60,7 +56,7 @@ 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 HEAD_LENGTH : integer := rx_header.mac_destination'length + rx_header.mac_source'length + rx_header.mac_ethertype'length;
constant CRC_LENGTH : integer := 4;
signal state : state_t;
signal sr_head : byte_vector(0 to HEAD_LENGTH - 1);
@ -148,9 +144,9 @@ begin
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_header.mac_destination <= sr_head(0 to 5);
rx_header.mac_source <= sr_head(6 to 11);
rx_header.mac_ethertype <= sr_head(12 to 13);
rx_mac_data <= sr_payload(0);
end block rx;
@ -159,7 +155,7 @@ begin
type tx_state_t is (IDLE, HEADER, DATA, TXCRC);
signal tx_state : tx_state_t;
signal sr : byte_vector(0 to tx_mac_destination'length + tx_mac_source'length + tx_mac_ethertype'length - 1);
signal sr : byte_vector(0 to tx_header.mac_destination'length + tx_header.mac_source'length + tx_header.mac_ethertype'length - 1);
constant BIT_CNT_MAX : integer := sr'high;
signal byte_cnt : integer range 0 to BIT_CNT_MAX;
@ -209,7 +205,7 @@ begin
when HEADER =>
if (tx_data_ack = '1') and (byte_cnt = 0) then -- Sync Header TX complete
sr <= tx_mac_destination & tx_mac_source & tx_mac_ethertype;
sr <= tx_header.mac_destination & tx_header.mac_source & tx_header.mac_ethertype;
crc_valid <= '1';
byte_cnt <= BIT_CNT_MAX;
tx_state <= DATA;

6
trashernet/trashernet_pkg.vhd
View File

@ -17,6 +17,12 @@ package trashernet_pkg is
subtype mac_addr_t is byte_vector(0 to 5);
subtype ip_addr_t is byte_vector(0 to 3);
subtype ethertype_t is byte_vector(0 to 1);
type mac_header_fields is record
mac_destination : mac_addr_t; -- Destination MAC address
mac_source : mac_addr_t; -- Source MAC address
mac_ethertype : ethertype_t; -- Ethertype or length
end record mac_header_fields;
end package trashernet_pkg;
package body trashernet_pkg is