1 files changed, 124 insertions(+), 0 deletions(-)

A src/data_link/data_link_layer.vhd

@@ 0,0 1,124 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use work.data_link_pkg.all;
+
+entity data_link_layer is
+  generic (
+    K_character  : std_logic_vector(7 downto 0) := "10111100";
+    R_character  : std_logic_vector(7 downto 0) := "00011100";
+    A_character  : std_logic_vector(7 downto 0) := "01111100";
+    Q_character  : std_logic_vector(7 downto 0) := "10011100");
+  port (
+    ci_char_clk : in std_logic;
+    ci_reset    : in std_logic;
+
+    -- lane configuration
+    ci_F : in integer range 0 to 256;
+    ci_K : in integer range 0 to 32;
+    ci_scrambled  : in std_logic;
+    do_lane_config : out link_config;
+
+    -- synchronization
+    co_lane_ready : out std_logic;      -- Received /A/, waiting for lane sync
+    ci_lane_start : in std_logic;       -- Start sending data from lane buffer
+
+    -- input, output
+    co_synced : out std_logic;
+    di_10b : in std_logic_vector(9 downto 0);
+    do_char : out frame_character);
+end entity data_link_layer;
+
+architecture a1 of data_link_layer is
+  signal char_alignment_do_10b : std_logic_vector(9 downto 0);
+
+  signal decoder_do_char : character_vector;
+
+  signal lane_alignment_co_aligned : std_logic;
+  signal lane_alignment_co_error : std_logic;
+  signal lane_alignment_co_ready : std_logic;
+  signal lane_alignment_do_char : character_vector;
+
+  signal frame_alignment_ci_request_sync : std_logic;
+  signal frame_alignment_ci_enable_realign : std_logic := '0';
+  signal frame_alignment_co_aligned : std_logic;
+  signal frame_alignment_co_error : std_logic;
+  signal frame_alignment_do_char : frame_character;
+
+  signal link_controller_co_synced : std_logic;
+  signal link_controller_co_state : link_state;
+  signal link_controller_do_config : link_config;
+  signal link_controller_ci_resync : std_logic := '0';
+begin  -- architecture a1
+  do_lane_config <= link_controller_do_config;
+  co_lane_ready <= lane_alignment_co_ready;
+  co_synced <= link_controller_co_synced;
+  do_char <= frame_alignment_do_char;
+
+  frame_alignment_ci_request_sync <= not link_controller_co_synced;
+
+  -- DATA LINK LAYER
+  --         --------------------> LINK CONTROLLER <-------------
+  --          |            |                         |        |
+  --  FRAME ALIGNMENT <= LANE ALIGNMENT <= 8b10b DECODER <= CHAR ALIGNMENT
+
+  -- link controller
+  link_controller : entity work.link_controller
+    port map (
+      ci_char_clk                => ci_char_clk,
+      ci_reset                   => ci_reset,
+      ci_resync                  => link_controller_ci_resync,
+      ci_F                       => ci_F,
+      ci_K                       => ci_K,
+      ci_lane_alignment_error    => lane_alignment_co_error,
+      ci_lane_alignment_aligned  => lane_alignment_co_aligned,
+      ci_lane_alignment_ready    => lane_alignment_co_ready,
+      ci_frame_alignment_error   => frame_alignment_co_error,
+      ci_frame_alignment_aligned => frame_alignment_co_aligned,
+      di_char                    => decoder_do_char,
+      do_config                  => link_controller_do_config);
+
+  -- char alignment
+  char_alignment: entity work.char_alignment
+    port map (
+      ci_char_clk => ci_char_clk,
+      ci_reset    => ci_reset,
+      ci_synced   => link_controller_co_synced,
+      di_10b      => di_10b,
+      do_10b      => char_alignment_do_10b);
+
+  -- 8b10b decoder
+  an8b10b_decoder: entity work.an8b10b_decoder
+    port map (
+      ci_char_clk => ci_char_clk,
+      ci_reset    => ci_reset,
+      di_10b      => char_alignment_do_10b,
+      do_char      => decoder_do_char);
+
+  -- lane alignment
+  lane_alignment: entity work.lane_alignment
+    port map (
+      ci_char_clk => ci_char_clk,
+      ci_reset    => ci_reset,
+      ci_F        => ci_F,
+      ci_K        => ci_K,
+      ci_state    => link_controller_co_state,
+      co_ready    => lane_alignment_co_ready,
+      ci_start    => ci_lane_start,
+      di_char     => decoder_do_char,
+      do_char     => lane_alignment_do_char);
+
+  -- frame alignment
+  frame_alignment : entity work.frame_alignment
+    port map (
+      ci_char_clk       => ci_char_clk,
+      ci_reset          => ci_reset,
+      ci_scrambled      => ci_scrambled,
+      ci_F              => ci_F,
+      ci_K              => ci_K,
+      ci_request_sync   => frame_alignment_ci_request_sync,
+      ci_enable_realign => frame_alignment_ci_enable_realign,
+      co_aligned        => frame_alignment_co_aligned,
+      co_misaligned     => frame_alignment_co_error,
+      di_char           => lane_alignment_do_char);
+
+end architecture a1;