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TEMP Implement state machine in packetizer for improved packet handling

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This commit is contained in:
Davide Cavagnola
2025-04-09 12:59:00 +02:00
parent 1e84f090b7
commit 0912887822
2 changed files with 83 additions and 5 deletions
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1
LAB2/src/depacketizer.vhd
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@@ -20,7 +20,6 @@ entity depacketizer is
m_axis_tvalid : out std_logic; m_axis_tvalid : out std_logic;
m_axis_tready : in std_logic; m_axis_tready : in std_logic;
m_axis_tlast : out std_logic m_axis_tlast : out std_logic
); );
end entity depacketizer; end entity depacketizer;

87
LAB2/src/packetizer.vhd
View File

@@ -26,11 +26,90 @@ end entity packetizer;
architecture rtl of packetizer is architecture rtl of packetizer is
type state_type is (IDLE, SEND_HEADER, FORWARD_PAYLOAD, SEND_FOOTER);
signal state : state_type := IDLE;
signal payload_buffer : std_logic_vector(7 downto 0);
signal last_seen : std_logic := '0'; -- Tracks s_axis_tlast
signal data_valid : std_logic := '0';
begin begin
process(clk)
begin
if rising_edge(clk) then
if aresetn = '0' then
-- Reset all states and outputs
state <= IDLE;
s_axis_tready <= '0';
m_axis_tvalid <= '0';
m_axis_tdata <= (others => '0');
data_valid <= '0';
last_seen <= '0';
end architecture; else
-- Defaults
s_axis_tready <= '0';
m_axis_tvalid <= '0';
case state is
when IDLE =>
-- Wait for input data to start a new packet
if s_axis_tvalid = '1' then
state <= SEND_HEADER;
payload_buffer <= s_axis_tdata;
data_valid <= '1';
last_seen <= s_axis_tlast;
end if;
when SEND_HEADER =>
-- Send HEADER byte
if m_axis_tready = '1' then
m_axis_tdata <= std_logic_vector(to_unsigned(HEADER, 8));
m_axis_tvalid <= '1';
state <= FORWARD_PAYLOAD;
end if;
when FORWARD_PAYLOAD =>
-- Send buffered payload from IDLE phase
if m_axis_tready = '1' and data_valid = '1' then
m_axis_tdata <= payload_buffer;
m_axis_tvalid <= '1';
data_valid <= '0';
-- Ready to receive next payload byte
s_axis_tready <= '1';
end if;
-- Check for new data while output is valid
if s_axis_tready = '1' and s_axis_tvalid = '1' then
payload_buffer <= s_axis_tdata;
data_valid <= '1';
last_seen <= s_axis_tlast;
-- If last payload byte, next state is FOOTER
if s_axis_tlast = '1' then
state <= SEND_FOOTER;
end if;
end if;
when SEND_FOOTER =>
if m_axis_tready = '1' and data_valid = '1' then
-- Send last payload byte
m_axis_tdata <= payload_buffer;
m_axis_tvalid <= '1';
data_valid <= '0';
elsif m_axis_tready = '1' then
-- Send FOOTER byte after last payload
m_axis_tdata <= std_logic_vector(to_unsigned(FOOTER, 8));
m_axis_tvalid <= '1';
state <= IDLE;
end if;
end case;
end if;
end if;
end process;
end architecture;