jtag_uart.vhd

一个毕业设计

--        lpm_hint => "RAM_BLOCK_TYPE=AUTO",
--        lpm_numwords => 64,
--        lpm_showahead => "OFF",
--        lpm_type => "scfifo",
--        lpm_width => 8,
--        lpm_widthu => 6,
--        overflow_checking => "OFF",
--        underflow_checking => "OFF",
--        use_eab => "ON"
--      )
--      port map(
--                clock => clk,
--                data => t_dat,
--                empty => internal_fifo_EF,
--                full => internal_rfifo_full,
--                q => internal_fifo_rdata,
--                rdreq => fifo_rd,
--                usedw => internal_rfifo_used,
--                wrreq => wr_rfifo
--      );
--
--synthesis read_comments_as_HDL off

end europa;


library altera_mf;
use altera_mf.all;

library altera_vhdl_support;
use altera_vhdl_support.altera_vhdl_support_lib.all;

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;

library lpm;
use lpm.all;

entity jtag_uart is 
        port (
              -- inputs:
                 signal av_address : IN STD_LOGIC;
                 signal av_chipselect : IN STD_LOGIC;
                 signal av_read_n : IN STD_LOGIC;
                 signal av_write_n : IN STD_LOGIC;
                 signal av_writedata : IN STD_LOGIC_VECTOR (31 DOWNTO 0);
                 signal clk : IN STD_LOGIC;
                 signal rst_n : IN STD_LOGIC;

              -- outputs:
                 signal av_irq : OUT STD_LOGIC;
                 signal av_readdata : OUT STD_LOGIC_VECTOR (31 DOWNTO 0);
                 signal av_waitrequest : OUT STD_LOGIC;
                 signal dataavailable : OUT STD_LOGIC;
                 signal readyfordata : OUT STD_LOGIC
              );
end entity jtag_uart;


architecture europa of jtag_uart is
component jtag_uart_scfifo_w is 
           port (
                 -- inputs:
                    signal clk : IN STD_LOGIC;
                    signal fifo_wdata : IN STD_LOGIC_VECTOR (7 DOWNTO 0);
                    signal fifo_wr : IN STD_LOGIC;
                    signal rd_wfifo : IN STD_LOGIC;

                 -- outputs:
                    signal fifo_FF : OUT STD_LOGIC;
                    signal r_dat : OUT STD_LOGIC_VECTOR (7 DOWNTO 0);
                    signal wfifo_empty : OUT STD_LOGIC;
                    signal wfifo_used : OUT STD_LOGIC_VECTOR (5 DOWNTO 0)
                 );
end component jtag_uart_scfifo_w;

component jtag_uart_scfifo_r is 
           port (
                 -- inputs:
                    signal clk : IN STD_LOGIC;
                    signal fifo_rd : IN STD_LOGIC;
                    signal rst_n : IN STD_LOGIC;
                    signal t_dat : IN STD_LOGIC_VECTOR (7 DOWNTO 0);
                    signal wr_rfifo : IN STD_LOGIC;

                 -- outputs:
                    signal fifo_EF : OUT STD_LOGIC;
                    signal fifo_rdata : OUT STD_LOGIC_VECTOR (7 DOWNTO 0);
                    signal rfifo_full : OUT STD_LOGIC;
                    signal rfifo_used : OUT STD_LOGIC_VECTOR (5 DOWNTO 0)
                 );
end component jtag_uart_scfifo_r;

--synthesis read_comments_as_HDL on
--  component alt_jtag_atlantic is
--GENERIC (
--      INSTANCE_ID : NATURAL;
--        LOG2_RXFIFO_DEPTH : NATURAL;
--        LOG2_TXFIFO_DEPTH : NATURAL
--      );
--    PORT (
--    signal r_ena : OUT STD_LOGIC;
--        signal t_dat : OUT STD_LOGIC_VECTOR (7 DOWNTO 0);
--        signal t_ena : OUT STD_LOGIC;
--        signal t_pause : OUT STD_LOGIC;
--        signal clk : IN STD_LOGIC;
--        signal r_dat : IN STD_LOGIC_VECTOR (7 DOWNTO 0);
--        signal r_val : IN STD_LOGIC;
--        signal rst_n : IN STD_LOGIC;
--        signal t_dav : IN STD_LOGIC
--      );
--  end component alt_jtag_atlantic;
--synthesis read_comments_as_HDL off
                signal ac :  STD_LOGIC;
                signal activity :  STD_LOGIC;
                signal fifo_AE :  STD_LOGIC;
                signal fifo_AF :  STD_LOGIC;
                signal fifo_EF :  STD_LOGIC;
                signal fifo_FF :  STD_LOGIC;
                signal fifo_rd :  STD_LOGIC;
                signal fifo_rdata :  STD_LOGIC_VECTOR (7 DOWNTO 0);
                signal fifo_wdata :  STD_LOGIC_VECTOR (7 DOWNTO 0);
                signal fifo_wr :  STD_LOGIC;
                signal ien_AE :  STD_LOGIC;
                signal ien_AF :  STD_LOGIC;
                signal internal_av_waitrequest :  STD_LOGIC;
                signal ipen_AE :  STD_LOGIC;
                signal ipen_AF :  STD_LOGIC;
                signal pause_irq :  STD_LOGIC;
                signal r_dat :  STD_LOGIC_VECTOR (7 DOWNTO 0);
                signal r_ena :  STD_LOGIC;
                signal r_val :  STD_LOGIC;
                signal rd_wfifo :  STD_LOGIC;
                signal read_0 :  STD_LOGIC;
                signal rfifo_full :  STD_LOGIC;
                signal rfifo_used :  STD_LOGIC_VECTOR (5 DOWNTO 0);
                signal rvalid :  STD_LOGIC;
                signal t_dat :  STD_LOGIC_VECTOR (7 DOWNTO 0);
                signal t_dav :  STD_LOGIC;
                signal t_ena :  STD_LOGIC;
                signal t_pause :  STD_LOGIC;
                signal wfifo_empty :  STD_LOGIC;
                signal wfifo_used :  STD_LOGIC_VECTOR (5 DOWNTO 0);
                signal woverflow :  STD_LOGIC;
                signal wr_rfifo :  STD_LOGIC;

begin

  rd_wfifo <= r_ena AND NOT wfifo_empty;
  wr_rfifo <= t_ena AND NOT rfifo_full;
  the_jtag_uart_scfifo_w : jtag_uart_scfifo_w
    port map(
      fifo_FF => fifo_FF,
      r_dat => r_dat,
      wfifo_empty => wfifo_empty,
      wfifo_used => wfifo_used,
      clk => clk,
      fifo_wdata => fifo_wdata,
      fifo_wr => fifo_wr,
      rd_wfifo => rd_wfifo
    );


  the_jtag_uart_scfifo_r : jtag_uart_scfifo_r
    port map(
      fifo_EF => fifo_EF,
      fifo_rdata => fifo_rdata,
      rfifo_full => rfifo_full,
      rfifo_used => rfifo_used,
      clk => clk,
      fifo_rd => fifo_rd,
      rst_n => rst_n,
      t_dat => t_dat,
      wr_rfifo => wr_rfifo
    );


  ipen_AE <= ien_AE AND fifo_AE;
  ipen_AF <= ien_AF AND ((pause_irq OR fifo_AF));
  av_irq <= ipen_AE OR ipen_AF;
  activity <= t_pause OR t_ena;
  process (clk, rst_n)
  begin
    if rst_n = '0' then
      pause_irq <= std_logic'('0');
    elsif clk'event and clk = '1' then
      -- only if fifo is not empty...
      if std_logic'((t_pause AND NOT fifo_EF)) = '1' then 
        pause_irq <= std_logic'('1');
      elsif std_logic'(read_0) = '1' then 
        pause_irq <= std_logic'('0');
      end if;
    end if;

  end process;

  process (clk, rst_n)
  begin
    if rst_n = '0' then
      r_val <= std_logic'('0');
      t_dav <= std_logic'('1');
    elsif clk'event and clk = '1' then
      r_val <= r_ena AND NOT wfifo_empty;
      t_dav <= NOT rfifo_full;
    end if;

  end process;

  process (clk, rst_n)
  begin
    if rst_n = '0' then
      fifo_AE <= std_logic'('0');
      fifo_AF <= std_logic'('0');
      fifo_wr <= std_logic'('0');
      rvalid <= std_logic'('0');
      read_0 <= std_logic'('0');
      ien_AE <= std_logic'('0');
      ien_AF <= std_logic'('0');
      ac <= std_logic'('0');
      woverflow <= std_logic'('0');
      internal_av_waitrequest <= std_logic'('1');
    elsif clk'event and clk = '1' then
      fifo_AE <= to_std_logic(((std_logic_vector'("0000000000000000000000000") & (Std_Logic_Vector'(A_ToStdLogicVector(fifo_FF) & wfifo_used)))<=std_logic_vector'("00000000000000000000000000001000")));
      fifo_AF <= to_std_logic(((std_logic_vector'("000000000000000000000000") & (((std_logic_vector'("01000000") - (std_logic_vector'("0") & (Std_Logic_Vector'(A_ToStdLogicVector(rfifo_full) & rfifo_used)))))))<=std_logic_vector'("00000000000000000000000000001000")));
      fifo_wr <= std_logic'('0');
      read_0 <= std_logic'('0');
      internal_av_waitrequest <= NOT (((av_chipselect AND ((NOT av_write_n OR NOT av_read_n))) AND internal_av_waitrequest));
      if std_logic'(activity) = '1' then 
        ac <= std_logic'('1');
      end if;
      -- write
      if std_logic'(((av_chipselect AND NOT av_write_n) AND internal_av_waitrequest)) = '1' then 
        -- addr 1 is control; addr 0 is data
        if std_logic'(av_address) = '1' then 
          ien_AF <= av_writedata(0);
          ien_AE <= av_writedata(1);
          if std_logic'((av_writedata(10) AND NOT activity)) = '1' then 
            ac <= std_logic'('0');
          end if;
        else
          fifo_wr <= NOT fifo_FF;
          woverflow <= fifo_FF;
        end if;
      end if;
      -- read
      if std_logic'(((av_chipselect AND NOT av_read_n) AND internal_av_waitrequest)) = '1' then 
        -- addr 1 is interrupt; addr 0 is data
        if std_logic'(NOT av_address) = '1' then 
          rvalid <= NOT fifo_EF;
        end if;
        read_0 <= NOT av_address;
      end if;
    end if;

  end process;

  fifo_wdata <= av_writedata(7 DOWNTO 0);
  fifo_rd <= A_WE_StdLogic((std_logic'(((((av_chipselect AND NOT av_read_n) AND internal_av_waitrequest) AND NOT av_address))) = '1'), NOT fifo_EF, std_logic'('0'));
  av_readdata <= A_EXT (A_WE_StdLogicVector((std_logic'(read_0) = '1'), (std_logic_vector'("0") & ((A_REP(std_logic'('0'), 9) & A_ToStdLogicVector(rfifo_full) & rfifo_used & A_ToStdLogicVector(rvalid) & A_ToStdLogicVector(woverflow) & A_ToStdLogicVector(NOT fifo_FF) & A_ToStdLogicVector(NOT fifo_EF) & A_ToStdLogicVector(std_logic'('0')) & A_ToStdLogicVector(ac) & A_ToStdLogicVector(ipen_AE) & A_ToStdLogicVector(ipen_AF) & fifo_rdata))), (A_REP(std_logic'('0'), 9) & ((std_logic_vector'("01000000") - (std_logic_vector'("0") & (Std_Logic_Vector'(A_ToStdLogicVector(fifo_FF) & wfifo_used))))) & A_ToStdLogicVector(rvalid) & A_ToStdLogicVector(woverflow) & A_ToStdLogicVector(NOT fifo_FF) & A_ToStdLogicVector(NOT fifo_EF) & A_ToStdLogicVector(std_logic'('0')) & A_ToStdLogicVector(ac) & A_ToStdLogicVector(ipen_AE) & A_ToStdLogicVector(ipen_AF) & A_REP(std_logic'('0'), 6) & A_ToStdLogicVector(ien_AE) & A_ToStdLogicVector(ien_AF))), 32);
  process (clk, rst_n)
  begin
    if rst_n = '0' then
      readyfordata <= std_logic'('0');
    elsif clk'event and clk = '1' then
      if (std_logic_vector'("00000000000000000000000000000001")) /= std_logic_vector'("00000000000000000000000000000000") then 
        readyfordata <= NOT fifo_FF;
      end if;
    end if;

  end process;

  --vhdl renameroo for output signals
  av_waitrequest <= internal_av_waitrequest;
--exemplar translate_off
    -- Tie off Atlantic Interface signals not used for simulation
    process (clk)
    begin
      if clk'event and clk = '1' then
        t_pause <= std_logic'('0');
        t_ena <= std_logic'('0');
        t_dat <= A_WE_StdLogicVector((std_logic'(t_dav) = '1'), r_dat, A_REP(r_val, 8));
        r_ena <= std_logic'('0');
      end if;

    end process;

    process (fifo_EF)
    begin
        if (std_logic_vector'("00000000000000000000000000000001")) /= std_logic_vector'("00000000000000000000000000000000") then 
          dataavailable <= NOT fifo_EF;
        end if;

    end process;

--exemplar translate_on
--synthesis read_comments_as_HDL on
--    jtag_uart_alt_jtag_atlantic : alt_jtag_atlantic
--      generic map(
--        INSTANCE_ID => 0,
--        LOG2_RXFIFO_DEPTH => 6,
--        LOG2_TXFIFO_DEPTH => 6
--      )
--      port map(
--                clk => clk,
--                r_dat => r_dat,
--                r_ena => r_ena,
--                r_val => r_val,
--                rst_n => rst_n,
--                t_dat => t_dat,
--                t_dav => t_dav,
--                t_ena => t_ena,
--                t_pause => t_pause
--      );
--
--    process (clk, rst_n)
--    begin
--      if rst_n = '0' then
--        dataavailable <= std_logic'('0');
--      elsif clk'event and clk = '1' then
--        if (std_logic_vector'("00000000000000000000000000000001")) /= std_logic_vector'("00000000000000000000000000000000") then 
--          dataavailable <= NOT fifo_EF;
--        end if;
--      end if;
--
--    end process;
--
--synthesis read_comments_as_HDL off

end europa;