ilyge

Для AXI Master не забудьте про "multiple outstanding transactions". Вот код для примера, тоже для себя делали: axi_controller_dma.vhd library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; library unisim; use unisim.vcomponents.all; entity AXI_CONTROLLER_DMA is generic (C_S_AXI_BASEADDR : std_logic_vector(31 downto 0) := X"FFFF0000"; C_S_AXI_HIGHADDR : std_logic_vector(31 downto 0) := X"FFFFFFFF"); port ( -- AXI Slave Interface AXI_ACLK : in std_logic; AXI_RESETN : in std_logic; -- AXI Slave Write Address Channel S_AXI_AWADDR : in std_logic_vector(31 downto 0); S_AXI_AWPROT : in std_logic_vector(2 downto 0); S_AXI_AWVALID : in std_logic; S_AXI_AWREADY : out std_logic; -- AXI Slave Write Data Channel S_AXI_WDATA : in std_logic_vector(31 downto 0); S_AXI_WSTRB : in std_logic_vector(3 downto 0); S_AXI_WVALID : in std_logic; S_AXI_WREADY : out std_logic; --AXI4 Write Response Channel S_AXI_BRESP : out std_logic_vector(1 downto 0); S_AXI_BVALID : out std_logic; S_AXI_BREADY : in std_logic; -- AXI Slave Read Address Channel S_AXI_ARADDR : in std_logic_vector(31 downto 0); S_AXI_ARPROT : in std_logic_vector(2 downto 0); S_AXI_ARVALID : in std_logic; S_AXI_ARREADY : out std_logic; -- AXI Slave Read Data Channel S_AXI_RDATA : out std_logic_vector(31 downto 0); S_AXI_RRESP : out std_logic_vector(1 downto 0); S_AXI_RVALID : out std_logic; S_AXI_RREADY : in std_logic; -- AXI4 Master Write Channel -- Write Address Channel M_AXI_AWREADY : in std_logic; M_AXI_AWVALID : out std_logic; M_AXI_AWADDR : out std_logic_vector(31 downto 0); M_AXI_AWLEN : out std_logic_vector(7 downto 0); M_AXI_AWSIZE : out std_logic_vector(2 downto 0); M_AXI_AWBURST : out std_logic_vector(1 downto 0); M_AXI_AWPROT : out std_logic_vector(2 downto 0); M_AXI_AWCACHE : out std_logic_vector(3 downto 0); -- Write Data Channel M_AXI_WREADY : in std_logic ; M_AXI_WVALID : out std_logic; M_AXI_WDATA : out std_logic_vector(63 downto 0); M_AXI_WSTRB : out std_logic_vector(7 downto 0); M_AXI_WLAST : out std_logic; -- Write Response Channel M_AXI_BREADY : out std_logic; M_AXI_BVALID : in std_logic; M_AXI_BRESP : in std_logic_vector(1 downto 0) ); end AXI_CONTROLLER_DMA; architecture RTL of AXI_CONTROLLER_DMA is component m_axi_users_bridge port ( -- axi slave interface axi_aclk : in std_logic; axi_resetn : in std_logic; ------------------------------ -- axi4 master write channel ------------------------------ -- write address channel m_axi_awready : in std_logic; m_axi_awvalid : out std_logic; m_axi_awaddr : out std_logic_vector(31 downto 0); m_axi_awlen : out std_logic_vector(7 downto 0); m_axi_awsize : out std_logic_vector(2 downto 0); m_axi_awburst : out std_logic_vector(1 downto 0); m_axi_awprot : out std_logic_vector(2 downto 0); m_axi_awcache : out std_logic_vector(3 downto 0); -- write data channel m_axi_wready : in std_logic ; m_axi_wvalid : out std_logic; m_axi_wdata : out std_logic_vector(63 downto 0); m_axi_wstrb : out std_logic_vector(7 downto 0); m_axi_wlast : out std_logic; -- write response channel m_axi_bready : out std_logic; m_axi_bvalid : in std_logic; m_axi_bresp : in std_logic_vector(1 downto 0); ------------------------------ -- write user channel ------------------------------ user_wr_req : in std_logic; user_wr_addr : in std_logic_vector(31 downto 0); user_wr_lenght : in std_logic_vector(15 downto 0); user_wr_ack : out std_logic; user_wr_tvalid : in std_logic; user_wr_tdata : in std_logic_vector(63 downto 0); user_wr_tlast : in std_logic; user_wr_tready : out std_logic); end component; component s_axi_user_bridge port( axi_aclk : in std_logic; axi_resetn : in std_logic; -- AXI Slave Write Address Channel s_axi_awaddr : in std_logic_vector(31 downto 0); s_axi_awvalid : in std_logic; s_axi_awready : out std_logic; s_axi_awprot : in std_logic_vector(2 downto 0); -- AXI Slave Write Data Channel s_axi_wdata : in std_logic_vector(31 downto 0); s_axi_wstrb : in std_logic_vector(3 downto 0); s_axi_wvalid : in std_logic; s_axi_wready : out std_logic; -- AXI4 Write Response Channel s_axi_bresp : out std_logic_vector(1 downto 0); s_axi_bvalid : out std_logic; s_axi_bready : in std_logic; -- AXI Slave Read Address Channel s_axi_araddr : in std_logic_vector(31 downto 0); s_axi_arvalid : in std_logic; s_axi_arready : out std_logic; s_axi_arprot : in std_logic_vector(2 downto 0); -- AXI Slave Read Data Channel s_axi_rdata : out std_logic_vector(31 downto 0); s_axi_rresp : out std_logic_vector(1 downto 0); s_axi_rvalid : out std_logic; s_axi_rready : in std_logic ; -- User Read/Write Data Channel user_reset : out std_logic; user_addr : out std_logic_vector(31 downto 0); user_wdata : out std_logic_vector(31 downto 0); user_rdata : in std_logic_vector(31 downto 0); user_be : out std_logic_vector(3 downto 0); user_wreq : out std_logic; user_wack : in std_logic; user_rreq : out std_logic; user_rack : in std_logic); end component; function n_dec_bit(baddr,haddr : std_logic_vector(31 downto 0)) return integer is variable baddr_xor_haddr : std_logic_vector(31 downto 0); begin baddr_xor_haddr := baddr xor haddr; for i in 31 downto 0 loop if baddr_xor_haddr(i) = '1' then return(i+1); end if; end loop; return(32); end function n_dec_bit; constant c_s_axi_n_dec_bit : integer := n_dec_bit(C_S_AXI_BASEADDR,C_S_AXI_HIGHADDR)-1; constant ADR_REG_BASEADDR : std_logic_vector(31 downto 0) := X"00000000"; constant LENGHT_REG_BASEADDR : std_logic_vector(31 downto 0) := X"00000004"; constant CNT_REG_BASEADDR : std_logic_vector(31 downto 0) := X"00000008"; --constant TIME_REG_BASEADDR : std_logic_vector(31 downto 0) := X"0000000c"; constant adr_reg_n_dec_bit : integer := n_dec_bit(ADR_REG_BASEADDR, X"00000003"); constant lenght_reg_n_dec_bit : integer := n_dec_bit(LENGHT_REG_BASEADDR, X"00000007"); constant cnt_reg_n_dec_bit : integer := n_dec_bit(CNT_REG_BASEADDR, X"0000000B"); --constant time_reg_n_dec_bit : integer := n_dec_bit(time_reg_BASEADDR, X"0000000f"); -- User Read/Write signals signal user_reset : std_logic; signal user_addr : std_logic_vector(31 downto 0); signal user_wdata : std_logic_vector(31 downto 0); signal user_rdata : std_logic_vector(31 downto 0); signal user_be : std_logic_vector(3 downto 0); signal user_wreq : std_logic; signal user_wack : std_logic; signal user_rreq : std_logic; signal user_rack : std_logic; signal read_addr : std_logic_vector(2 downto 0); signal adr_reg : std_logic_vector(31 downto 0); signal lenght_reg : std_logic_vector(31 downto 0); signal cnt_reg : std_logic_vector(31 downto 0) := (others=>'0'); signal adr_reg_ce : std_logic; signal lenght_reg_ce : std_logic; signal cnt_reg_ce : std_logic; --signal time_reg_ce : std_logic; signal dac_count : std_logic_vector(13 downto 0); signal m_user_wr_req : std_logic; signal m_user_wr_addr : std_logic_vector(31 downto 0) := (others=>'0'); signal m_user_wr_lenght : std_logic_vector(16 downto 0) := (others=>'0'); signal m_user_wr_ack : std_logic; signal m_user_wr_tvalid : std_logic := '0'; signal m_user_wr_tdata : std_logic_vector(63 downto 0) := (others=>'0'); signal m_user_wr_tdata_i : std_logic_vector(31 downto 0) := (others=>'0'); signal m_user_wr_tdata_j : std_logic_vector(31 downto 0) := (others=>'0'); signal m_user_wr_tlast : std_logic := '0'; signal m_user_wr_tready : std_logic := '0'; signal time_reg : std_logic_vector(31 downto 0) := (others=>'0'); signal count_time_reg_en , count_lenght_en : std_logic := '0'; type state_type is (ST_IDLE, ST_DATA); signal state ,next_state : state_type; begin ----------------------------------------------------------- ----------------------------------------------------------- s_axi_user_bridge_inst : s_axi_user_bridge port map( axi_aclk => AXI_ACLK, axi_resetn => AXI_RESETN, s_axi_awaddr => s_axi_awaddr, s_axi_awvalid => s_axi_awvalid, s_axi_awready => s_axi_awready, s_axi_awprot => s_axi_awprot, s_axi_wdata => s_axi_wdata, s_axi_wstrb => s_axi_wstrb, s_axi_wvalid => s_axi_wvalid, s_axi_wready => s_axi_wready, s_axi_bresp => s_axi_bresp, s_axi_bvalid => s_axi_bvalid, s_axi_bready => s_axi_bready, s_axi_araddr => s_axi_araddr, s_axi_arvalid => s_axi_arvalid, s_axi_arready => s_axi_arready, s_axi_arprot => s_axi_arprot, s_axi_rdata => s_axi_rdata, s_axi_rresp => s_axi_rresp, s_axi_rvalid => s_axi_rvalid, s_axi_rready => s_axi_rready, user_reset => user_reset, user_addr => user_addr, user_wdata => user_wdata, user_rdata => user_rdata, user_be => user_be, user_wreq => user_wreq, user_wack => user_wack, user_rreq => user_rreq, user_rack => user_rack); ----------------------------------------------------------- adr_reg_ce <= '1' when (user_addr(c_s_axi_n_dec_bit downto adr_reg_n_dec_bit) = ADR_REG_BASEADDR(c_s_axi_n_dec_bit downto adr_reg_n_dec_bit)) else '0'; lenght_reg_ce <= '1' when (user_addr(c_s_axi_n_dec_bit downto lenght_reg_n_dec_bit) = LENGHT_REG_BASEADDR(c_s_axi_n_dec_bit downto lenght_reg_n_dec_bit)) else '0'; cnt_reg_ce <= '1' when (user_addr(c_s_axi_n_dec_bit downto cnt_reg_n_dec_bit) = CNT_REG_BASEADDR(c_s_axi_n_dec_bit downto cnt_reg_n_dec_bit)) else '0'; --time_reg_ce <= '1' when (user_addr(c_s_axi_n_dec_bit downto time_reg_n_dec_bit) = TIME_REG_BASEADDR(c_s_axi_n_dec_bit downto time_reg_n_dec_bit)) else '0'; -- User Write Data Channel user_wack <= '1' when (user_wreq = '1' and (lenght_reg_ce = '1' or adr_reg_ce = '1' or cnt_reg_ce = '1')) else '0'; user_rack <= user_rreq; process ( AXI_ACLK , user_reset ) begin if ( AXI_ACLK = '1' and AXI_ACLK 'event) then if (user_reset ='1') then adr_reg <= (others => '0'); lenght_reg <= (others => '0'); elsif (user_wreq = '1') then if ( adr_reg_ce = '1') then adr_reg <= user_wdata; end if; if ( lenght_reg_ce = '1') then lenght_reg <= user_wdata; end if; -- if ( cnt_reg_ce = '1') then -- cnt_reg <= user_wdata; -- end if; end if; end if; end process; ----------------------------------------------------------- -- AXI Slave_User Read Data Channel read_addr <= user_addr(4 downto 2); process (read_addr, cnt_reg, adr_reg, lenght_reg, cnt_reg, time_reg) begin case (read_addr) is when "000" => user_rdata <= adr_reg; when "001" => user_rdata <= lenght_reg; when "010" => user_rdata <= cnt_reg; when "011" => user_rdata <= time_reg; when others => user_rdata <= x"ffffffff"; end case; end process; ----------------------------------------------------------- ----------------------------------------------------------- m_axi_users_bridge_inst: m_axi_users_bridge port map( axi_aclk => axi_aclk, axi_resetn => axi_resetn, m_axi_awready => m_axi_awready, m_axi_awvalid => m_axi_awvalid, m_axi_awaddr => m_axi_awaddr, m_axi_awlen => m_axi_awlen, m_axi_awsize => m_axi_awsize, m_axi_awburst => m_axi_awburst, m_axi_awprot => m_axi_awprot, m_axi_awcache => m_axi_awcache, m_axi_wready => m_axi_wready, m_axi_wvalid => m_axi_wvalid, m_axi_wdata => m_axi_wdata, m_axi_wstrb => m_axi_wstrb, m_axi_wlast => m_axi_wlast, m_axi_bready => m_axi_bready, m_axi_bvalid => m_axi_bvalid, m_axi_bresp => m_axi_bresp, user_wr_req => m_user_wr_req, user_wr_addr => m_user_wr_addr, user_wr_lenght => lenght_reg(15 downto 0), user_wr_ack => m_user_wr_ack, user_wr_tvalid => m_user_wr_tvalid, user_wr_tdata => m_user_wr_tdata, user_wr_tlast => m_user_wr_tlast, user_wr_tready => m_user_wr_tready); ----------------------------------------------------------- m_user_wr_addr <= adr_reg; ----------------------------------------------------------- process (AXI_ACLK, user_reset) begin if (AXI_ACLK'event and AXI_ACLK = '1') then if (user_reset = '1') then state <= ST_IDLE; else state <= next_state; end if; end if; end process; process (state, cnt_reg_ce, user_wreq, user_wdata, m_user_wr_ack, m_user_wr_lenght,m_user_wr_tready) begin m_user_wr_req <= '0'; m_user_wr_tvalid <= '0'; m_user_wr_tlast <= '0'; count_time_reg_en <= '0'; cnt_reg(0) <= '0'; next_state <= state; case state is when ST_IDLE => if (cnt_reg_ce = '1' and user_wreq = '1' and user_wdata(0) = '1') then m_user_wr_req <= '1'; cnt_reg(0) <= '1'; end if; if( m_user_wr_ack = '1') then cnt_reg(0) <= '1'; next_state <= ST_DATA; end if; when ST_DATA => cnt_reg(0) <= '1'; m_user_wr_tvalid <= '1'; m_user_wr_tlast <= m_user_wr_lenght(16); if(m_user_wr_lenght(16) = '1' and m_user_wr_tready = '1') then next_state <= ST_IDLE; end if; end case; end process; ----------------------------------------------------------- process (AXI_ACLK) begin if (AXI_ACLK'event and AXI_ACLK = '1') then if (m_user_wr_ack = '1') then time_reg <= (others=>'0'); elsif (cnt_reg(0) = '1') then-- time_reg <= time_reg + 1; end if; end if; end process; ----------------------------------------------------------- process (AXI_ACLK) begin if (AXI_ACLK'event and AXI_ACLK = '1') then if (m_user_wr_ack = '1') then m_user_wr_tdata_i <= (others=>'0'); m_user_wr_tdata_j <= x"00000001";-- elsif (m_user_wr_tready = '1') then m_user_wr_tdata_i <= m_user_wr_tdata_i + 2; m_user_wr_tdata_j <= m_user_wr_tdata_j + 2; end if; end if; end process; m_user_wr_tdata <= x"00000000" & m_user_wr_tdata_i;--m_user_wr_tdata_j ----------------------------------------------------------- process (AXI_ACLK) begin if (AXI_ACLK'event and AXI_ACLK = '1') then if (m_user_wr_ack = '1') then m_user_wr_lenght <= ('0'&lenght_reg(15 downto 0)) - 1; elsif (m_user_wr_tready = '1') then m_user_wr_lenght <= m_user_wr_lenght - 1; end if; end if; end process; ----------------------------------------------------------- ----------------------------------------------------------- end RTL; m_axi_user_bridge.vhd library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; library unisim; use unisim.vcomponents.all; entity M_AXI_USERS_BRIDGE is port ( -- AXI Interface AXI_ACLK : in std_logic; AXI_RESETN : in std_logic; ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- -- AXI4 Master Write Channel ----------------------------------------------------------------------------- -- Write Address Channel M_AXI_AWREADY : in std_logic; M_AXI_AWVALID : out std_logic; M_AXI_AWADDR : out std_logic_vector(31 downto 0); M_AXI_AWLEN : out std_logic_vector(7 downto 0); M_AXI_AWSIZE : out std_logic_vector(2 downto 0); M_AXI_AWBURST : out std_logic_vector(1 downto 0); M_AXI_AWPROT : out std_logic_vector(2 downto 0); M_AXI_AWCACHE : out std_logic_vector(3 downto 0); -- Write Data Channel M_AXI_WREADY : in std_logic ; M_AXI_WVALID : out std_logic; M_AXI_WDATA : out std_logic_vector(63 downto 0); M_AXI_WSTRB : out std_logic_vector(7 downto 0); M_AXI_WLAST : out std_logic; -- Write Response Channel M_AXI_BREADY : out std_logic; M_AXI_BVALID : in std_logic; M_AXI_BRESP : in std_logic_vector(1 downto 0); ----------------------------------------------------------------------------- -- Write User Channel ----------------------------------------------------------------------------- USER_WR_REQ : in std_logic; USER_WR_ADDR : in std_logic_vector(31 downto 0); USER_WR_LENGHT : in std_logic_vector(15 downto 0); USER_WR_ACK : out std_logic; USER_WR_TVALID : in std_logic; USER_WR_TDATA : in std_logic_vector(63 downto 0); USER_WR_TLAST : in std_logic; USER_WR_TREADY : out std_logic ); end M_AXI_USERS_BRIDGE; architecture RTL of M_AXI_USERS_BRIDGE is type state_type is (ST_IDLE, ST_ADDR); signal state, next_state : state_type; signal count_awlen : std_logic_vector(16 downto 0):= (others => '0'); signal count_awaddr : std_logic_vector(31 downto 0):= (others => '0'); signal count_addr_load : std_logic; signal count_addr_en : std_logic; signal count_data : std_logic_vector(4 downto 0):= (others => '0'); signal count_data_init : std_logic; signal count_data_en : std_logic; signal count_addr_que : std_logic_vector(4 downto 0):= (others => '0'); ----------------------------------------------------------------------- begin M_AXI_AWSIZE <= "011"; M_AXI_AWBURST <= "01"; M_AXI_AWPROT <= (others => '0'); M_AXI_AWCACHE <= (others => '0'); M_AXI_WSTRB <= x"ff"; M_AXI_BREADY <= '1'; M_AXI_AWADDR <= count_awaddr; M_AXI_AWLEN <= x"0f" when( count_awlen(16) = '0') else "0000" & count_awlen(3 downto 0); M_AXI_WVALID <= USER_WR_TVALID; M_AXI_WDATA <= USER_WR_TDATA; USER_WR_TREADY <= M_AXI_WREADY; ----------------------------------------------------------- ----------------------------------------------------------- process (AXI_ACLK, AXI_RESETN) begin if (AXI_ACLK'event and AXI_ACLK = '1') then if (AXI_RESETN = '0') then state <= ST_IDLE; else state <= next_state; end if; end if; end process; process (state, USER_WR_REQ, count_awlen, M_AXI_AWREADY) begin M_AXI_AWVALID <= '0'; USER_WR_ACK <= '0'; count_addr_load <= '0'; count_addr_en <= '0'; next_state <= state; case state is when ST_IDLE => if (USER_WR_REQ = '1') then USER_WR_ACK <= '1'; count_addr_load <= '1'; next_state <= ST_ADDR; end if; when ST_ADDR => M_AXI_AWVALID <= '1'; count_addr_en <= M_AXI_AWREADY; if (count_awlen(16) = '1' and M_AXI_AWREADY = '1') then next_state <= ST_IDLE; end if; end case; end process; ----------------------------------------------------------- process (AXI_ACLK) begin if (AXI_ACLK'event and AXI_ACLK = '1') then if (count_addr_load = '1') then count_awaddr(31 downto 3) <= USER_WR_ADDR(31 downto 3); count_awlen <= ('0'&USER_WR_LENGHT) - 16; elsif (count_addr_en = '1') then count_awaddr(31 downto 3) <= count_awaddr(31 downto 3) + 16; count_awlen <= count_awlen - 16; end if; end if; end process; ----------------------------------------------------------- count_data_en <= '1' when (( USER_WR_TVALID = '1' and M_AXI_WREADY = '1') or AXI_RESETN = '0') else '0'; count_data_init <= '1' when ((count_data(4) = '1' or USER_WR_TLAST = '1') or AXI_RESETN = '0') else '0'; M_AXI_WLAST <= count_data_init; ----------------------------------------------------------- process (AXI_ACLK) begin if (AXI_ACLK'event and AXI_ACLK = '1') then if (count_data_en = '1') then if (count_data_init = '1') then count_data <= "00000" + 1; else count_data <= count_data + 1; end if; end if; end if; end process; ----------------------------------------------------------- end RTL;

Очень давно для сканирующего приемника делалали регистратор на XILINX. Неприрывный поток с ADC 16 bit на частоте чуть больше 30 MHz писали в RAID. Да... UDP, JUMBO... P.S. Для кого лень делать свой аппаратный UDP, возьмите с OpenCores. Там есть вполне рабочая версия. Сложности в аппаратной реализации нет никакой, там до неприличия простой проек получается.

When power is ramped, the RESET# pin should be less than 0.2 × Vddq. Holding the RESET# pin LOW ensures that the outputs remain disabled (High-Z) and that ODT is off (Rtt is High-Z). Ensuring that Rtt is High-Z in DDR3 is one major difference between the DDR2 and DDR3 initialization routines. DDR2 requires that the ODT pin is held LOW after Vref is at a valid level, but DDR3 internally takes care of this when the RESET# pin is held LOW.

Вот что пишут на alteraforum ALTERA: FPGA configuration time and PCIe specification

В моем случае это был баг а не фитча :) Если хотите использовать это как фитчу, лучше попробуйте вначале на какой нибуть плате с PCIe.

Да, наблюдал такой эффект... Машина не грузится если reset зажат... Но мое мнение, лучше этого не делать. :) Есть еще опция в BIOS : PCIE Reset Delay. Вводит дополнительную задержку при сбросе шины PCI Express. (просто к сведению).

А не легче просто в pcores положить сделанное ядро. Если не разобрались, скиньте проект посмотрю... (нужны только имена файлов hdl и top)

AVNET: MIG parameters for SP6 LX75T. "The issue with running your MIG-generated design may be a BOARD-LEVEL ISSUE. The errata for this board (posted on the DRC) describes a known problem with the DDR3 interface and the default bitgen settings. By default the bitgen settings for any XPS project attach pulldowns to any unused signals on the FPGA. This breaks the FPGA designs using the MCBs. To fix this, change the bitgen settings to allow unused pins to float. Add this line to the bitgen settings file (bitgen.ut) of your project: -g UnusedPin: Pullnone (remove the space between the ':' and 'P') This should fix the problem." Xor.kruger, да... это очень распространенная ошибка :)

Corner все правильно советует :) Через двух портовую память. Поток входных данных пишется циклически через один порт, а через второй порт читаете по нужным адресам и обрабатываете данные. Если в двух словах. По ресурсам займет копейки.

Это не должно влиять на работу DDR. Скорее всего забыли в TOP вынести какой-то сигнал управления. Советую проверить вначале работу DDR через JTAG, используя MIG. Заодно и UCF разберетесь.

Очень Благодарен за предложение! Пока только присматриваюсь. Всегда хотел работать на космос... Короче на все то, что сейчас не популярно и к сожалению мало оплачиваемо... Межпланетные станции и т.д. :)

Я работаю на РТИ Минца... Станции СПРН... Поверьте у нас уровень разрабатываемой аппаратуры высок... Я не знаю кто в таких масштабах кроме как РТИ у нас в стране занимается продукцией Xilinx :)

А можно по подробнее о FPGA проектах. SoC Xilinx? Для космических летательных аппаратов? ГЛОНАСС? Есть что нибудь интересное? Дальний космос например... Совместные проекты с Европой, только не наземная аппаратура?

Можем обсудить. Адрес сайта в моем профиле.

Советую прочитать классику, начиная со стр. 874 :) Проектирование цифровых устройств, Дк. Ф. Уэйкерли.

Очень советую для начала прочитать книжку: "High-Speed Serial I/O Made Simple A Designers’ Guide, with FPGA Applications" MGT использовали без Channel Bonding на 1.25 (Gbit/s), как в режимах framing, так streaming. Не советую режим streaming для больших расстояний. (один опорный генератор для приемника и передатчика) Xilinx LocalLink Bus, в основном использовали для связи с кристаллами без MGT (например кристал FX с SX) MGT использовали для Chip-to-Chip до 20 см. ТТЛ XLL Bus для Chip-to-Chip до 5 см. Для Box-to-Box использовали SFP (P.S. Плату с MGT схемотехники должны разрабатывать обязательно с участием FPGA Designer'ов)

Пользуем между кристаллами MGT (Aurora) и обыкновенные ТТЛ линии (Xilinx LocalLink Bus).

Используй метокомментарий в synplify : // synthesis attribute equivalent_register_removal of sdram_dq_oe is "no" Можно прочитать : wp231.pdf (HDL Coding Practices to Accelerate Design Performance) Пример : attribute EQUIVALENT_REGISTER_REMOVAL : string; attribute EQUIVALENT_REGISTER_REMOVAL of ce1 : signal is "NO"; attribute EQUIVALENT_REGISTER_REMOVAL of ce2 : signal is "NO"; begin -- Clock enable register with 64 fanout -- replicated once process (clk) begin if (rising_edge(clk)) then ce1 <= ce; ce2 <= ce; end if; end process; process (clk) begin if (rising_edge(clk)) then if (ce1='1') then res(31 downto 0) <= a_data(31 downto 0); end if; if (ce2='1') then res(63 downto 32) <= a_data(63 downto 32); end if; end if; end process;

Почитай Platform Specification Format Reference Manual (у меня 10.1 EDK) ADDR_TYPE The ADDR_TYPE keyword identifies an address parameter of a defined memory class. The keyword is expressed in the following format: PARAMETER C_BASEADDR=0xFFFFFFFF, MIN_SIZE=0x2000, ADDR_TYPE=REGISTER ADDR_TYPE Values BRIDGE - Address window on the bridge. An address of this type is forwarded to the bus which is slave to the bridge. MEMORY - Address window on the memory controller. An address of this type points to a storage memory, such as SDRAM, DDR, FLASH, or BRAM. REGISTER - Address of its own registers. An address of this type points to registers in the peripheral. These could be status, control, data registers, or some Вот пример: PARAMETER C_MEM0_BASEADDR = 0xffffffff, DT = std_logic_vector, BUS = SPLB, ADDRESS = BASE, PAIR = C_MEM0_HIGHADDR, ADDR_TYPE = MEMORY, PARAMETER C_MEM0_HIGHADDR = 0x00000000, DT = std_logic_vector, BUS = SPLB, ADDRESS = HIGH, PAIR = C_MEM0_BASEADDR, ADDR_TYPE = MEMORY