我正在制作一个自定义硬件ARINC 429 Core。目前，我已经描述了根据ARINC 429标准和FIFO传输中的模块(TX-FSM(，它从中获取数据并将其发送到外部。FIFO的工作频率为2MHz(clk2M(，而TX-FSM可以根据标准从2MHz产生100kb/s或12.5kb/s(clk429(的频率。
由于FIFO工作在较高的频率(2MHz(，而TX-FSM工作在较低的频率(100kb/s(，当TX-FSM通过升高"；TX_ FIFO_；信号(FIFO上的"rd_en"(，FIFO提供其内包含的所有数据，因为在FIFO时钟域中；rd_en"；信号在几个周期内保持高电平。
FIFO一次只能提供一个数据。一旦传输了数据，TX-FSM将请求下一个数据。
如何使用单个时钟使FIFO和TX-FSM同步工作？
FIFO VHDL代码：
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity FIFO is
generic (
FIFO_WIDTH : natural := 32;
FIFO_DEPTH : integer := 10;
ALMOST_FULL_LEVEL : integer := 8;
ALMOST_EMPTY_LEVEL : integer := 2
);
port (
reset : in std_logic;
clk : in std_logic;
-- FIFO Write Interface
wr_en : in std_logic;
wr_data : in std_logic_vector(FIFO_WIDTH-1 downto 0);
ALMOST_FULL : out std_logic;
FULL : out std_logic;
-- FIFO Read Interface
rd_en : in std_logic;
rd_data : out std_logic_vector(FIFO_WIDTH-1 downto 0);
ALMOST_EMPTY : out std_logic;
EMPTY : out std_logic
);
end FIFO;
architecture rtl of FIFO is
type t_FIFO_DATA is array (0 to FIFO_DEPTH) of std_logic_vector(FIFO_WIDTH-1 downto 0);
signal r_FIFO_DATA : t_FIFO_DATA := (others => (others => '0'));
signal r_WR_INDEX : integer range 0 to FIFO_DEPTH -1 := 0;
signal r_RD_INDEX : integer range 0 to FIFO_DEPTH -1 := 0;
-- # Words in FIFO, has extra range to allow for assert conditions
signal r_FIFO_COUNT : integer range -1 to FIFO_DEPTH+1 := 0;
signal w_FULL : std_logic;
signal w_EMPTY : std_logic;
begin
-- FIFO process
-------------------------------------------------------------------
-------------------------------------------------------------------
WRITE_INDEX : process(clk)
begin
if rising_edge(clk) then
if reset = '1' then
r_WR_INDEX <= 1;
else
if (wr_en = '1' and w_FULL = '0') then
if r_WR_INDEX = FIFO_DEPTH-1 then
r_WR_INDEX <= 1;
else
r_WR_INDEX <= r_WR_INDEX + 1;
end if;
end if;
end if;
end if;
end process;
READ_INDEX : process(clk)
begin
if rising_edge(clk) then
if reset = '1' then
r_RD_INDEX <= 0;
else
if (rd_en = '1' and w_EMPTY = '0') then
if r_RD_INDEX = FIFO_DEPTH-1 then
r_RD_INDEX <= 0;
else
r_RD_INDEX <= r_RD_INDEX + 1;
end if;
end if;
end if;
end if;
end process;
COUNT_INDEX : process(clk)
begin
if rising_edge(clk) then
if reset = '1' then
r_FIFO_COUNT <= 0;
else
if (wr_en = '1' and rd_en = '0') then
r_FIFO_COUNT <= r_FIFO_COUNT + 1;
elsif (wr_en = '0' and rd_en = '1') then
if r_FIFO_COUNT > 0 then
r_FIFO_COUNT <= r_FIFO_COUNT - 1;
end if;
end if;
end if;
end if;
end process;
Write_Data : process (clk) is
begin
if rising_edge(clk) then
if wr_en = '1' then
r_FIFO_DATA(r_WR_INDEX) <= wr_data;
end if;
end if;
end process;
rd_data <= r_FIFO_DATA(r_RD_INDEX);
w_FULL <= '1' when r_FIFO_COUNT = FIFO_DEPTH else '0';
w_EMPTY <= '1' when r_FIFO_COUNT = 0 else '0';
ALMOST_FULL <= '1' when r_FIFO_COUNT > ALMOST_FULL_LEVEL else '0';
ALMOST_EMPTY <= '1' when r_FIFO_COUNT < ALMOST_EMPTY_LEVEL else '0';
FULL <= w_FULL;
EMPTY <= w_EMPTY;
end rtl;
TX-FSM代码
-- Arinc 429 trasmitter interface
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity Tx is
port
(
--INPUT
clk2M : in std_logic; -- clock signal
reset : in std_logic; -- reset signal
enable : in std_logic; -- enable signal
en_parity : in std_logic; -- enable parity bit
parity : in std_logic; -- odd/even parity
speed : in std_logic; -- speed 100kbps or 12.5kbps
gap : in std_logic; -- gap between two messages: 4 or 64 bit of gap
TX_FIFO_ep : in std_logic; -- TX FIFO EMPTY
a429TX_in : in std_logic_vector (31 downto 0); -- data in
--OUTPUT
a429TX_outA : out std_logic; -- positive out
a429TX_outB : out std_logic; -- negative out
TX_FIFO_rd : out std_logic -- TX FIFO READ
);
end entity;
architecture RTL_A429TX of Tx is
-- FSM state name
type state_type is (IDLE,START, PAR,TRANSMITTING,WAITING);
signal state : state_type;
-- FSM register
signal shift_reg : std_logic_vector (31 downto 0);
signal shift_counter : std_logic_vector (4 downto 0);
signal gap_counter : std_logic_vector (6 downto 0);
-- speed clock register
signal clk429 : std_logic;
signal clk429_counter : integer;
signal clk429_max_count : integer;
signal clk429_half_count : integer;
begin
-- speed clock process
-------------------------------------------------------------------
-------------------------------------------------------------------
-- select speed process
process (speed)
begin
if (speed = '1') then
clk429_max_count <= 19; -- 100kbs/s
clk429_half_count <= 10;
else
clk429_max_count <= 159; -- 12.5kbs/s
clk429_half_count <= 80;
end if;
end process;
-- clock429 generate speed process
process (clk2M, reset)
begin
if (reset = '1') then
clk429 <= '0';
elsif rising_edge(clk2M) then
if (clk429_counter <= clk429_half_count ) then
clk429 <= '1';
else
clk429 <= '0';
end if;
end if;
end process;
-- counter activity process
process (clk2M, reset)
begin
if (reset = '1') then
clk429_counter <= 0;
elsif rising_edge(clk2M) then
if (clk429_counter >= clk429_max_count) then
clk429_counter <= 0;
else
clk429_counter <= clk429_counter + 1;
end if;
end if;
end process;
-------------------------------------------------------------------
-------------------------------------------------------------------
-- a429TX interface process
process (clk429, reset)
variable p : std_logic;
begin
if reset = '1' then
state <= IDLE;
shift_reg <= (others => '0');
shift_counter <= (others => '0');
gap_counter <= (others => '0');
a429TX_outA <= '0';
a429TX_outB <= '0';
TX_FIFO_rd <= '0';
elsif rising_edge(clk429) then
case state is
when IDLE => -- idle state
if (enable = '1') then
if (gap = '1') then
gap_counter <= "0000100"; -- 4
else
gap_counter <= "1000000"; -- 64
end if;
if TX_FIFO_ep = '0' then
TX_FIFO_rd <= '1';
state <= START;
else
state <= IDLE;
end if;
else
state <= IDLE;
end if;
when START =>
-- data formatting
TX_FIFO_rd <= '0';
shift_reg <= a429TX_in(31 downto 8)& a429TX_in(0) & a429TX_in(1) & a429TX_in(2) & a429TX_in(3) & a429TX_in(4) & a429TX_in(5) & a429TX_in(6) & a429TX_in(7);
shift_counter <= "11111";
if ( en_parity = '1') then
state <= PAR;
else
state <= TRANSMITTING;
end if;
when PAR => -- parity state
--TX_FIFO_rd <= '0';
p := '0';
for I in 31 downto 0 loop
p := p xor shift_reg(I);
end loop;
if (parity = '1') then
shift_reg(31) <= p; -- odd
else
shift_reg(31) <= not p; -- even
end if;
state <= TRANSMITTING;
when TRANSMITTING => -- transmission state
--TX_FIFO_rd <= '0';
a429TX_outA <= shift_reg(0);
a429TX_outB <= not shift_reg(0);
shift_reg <= shift_reg(0) & shift_reg(31 downto 1);
if (shift_counter = "00000") then
state <= WAITING;
else
shift_counter <= shift_counter -1;
state <= TRANSMITTING;
end if;
when WAITING => -- wait state. generate gap
a429TX_outA <= '0';
a429TX_outB <= '0';
if (gap_counter > 0) then
gap_counter <= gap_counter - 1;
state <= WAITING;
else
state <= IDLE;
end if;
when others => -- default
state <= IDLE;
end case;
elsif falling_edge (clk429) then
a429TX_outA <= '0';
a429TX_outB <= '0';
end if;
end process;
clk429 <= clk429;
end architecture;
谢谢你的帮助。
在2 MHzclk2M下运行两个FIFO，然后在需要FIFO读取数据传输时在TX_FIFO_rd上生成单周期启用指示。
因此，您可以从同步设计中获得好处，而无需处理多个时钟域。
此外，生成像clk429这样的内部时钟并不是好的(但实际上非常糟糕：-(同步设计实践，因为它会导致错误修剪设计和更复杂的静态时序分析(STA(时序闭合。相反，制作一个断言为单个周期的使能信号，在clk2M上运行设计，并且仅在使能信号为高时更新相关状态。