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[/] [pcie_ds_dma/] [trunk/] [core/] [ds_dma64/] [pcie_src/] [pcie_core64_m1/] [source_virtex6/] [pcie_brams_v6.vhd] - Rev 15
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------------------------------------------------------------------------------- -- -- (c) Copyright 2009-2011 Xilinx, Inc. All rights reserved. -- -- This file contains confidential and proprietary information -- of Xilinx, Inc. and is protected under U.S. and -- international copyright and other intellectual property -- laws. -- -- DISCLAIMER -- This disclaimer is not a license and does not grant any -- rights to the materials distributed herewith. Except as -- otherwise provided in a valid license issued to you by -- Xilinx, and to the maximum extent permitted by applicable -- law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND -- WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES -- AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING -- BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON- -- INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and -- (2) Xilinx shall not be liable (whether in contract or tort, -- including negligence, or under any other theory of -- liability) for any loss or damage of any kind or nature -- related to, arising under or in connection with these -- materials, including for any direct, or any indirect, -- special, incidental, or consequential loss or damage -- (including loss of data, profits, goodwill, or any type of -- loss or damage suffered as a result of any action brought -- by a third party) even if such damage or loss was -- reasonably foreseeable or Xilinx had been advised of the -- possibility of the same. -- -- CRITICAL APPLICATIONS -- Xilinx products are not designed or intended to be fail- -- safe, or for use in any application requiring fail-safe -- performance, such as life-support or safety devices or -- systems, Class III medical devices, nuclear facilities, -- applications related to the deployment of airbags, or any -- other applications that could lead to death, personal -- injury, or severe property or environmental damage -- (individually and collectively, "Critical -- Applications"). Customer assumes the sole risk and -- liability of any use of Xilinx products in Critical -- Applications, subject only to applicable laws and -- regulations governing limitations on product liability. -- -- THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS -- PART OF THIS FILE AT ALL TIMES. -- ------------------------------------------------------------------------------- -- Project : Virtex-6 Integrated Block for PCI Express -- File : pcie_brams_v6.vhd -- Version : 2.3 ---- Description: BlockRAM module for Virtex6 PCIe Block ---- ---- ---- ---------------------------------------------------------------------------------- library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity pcie_brams_v6 is generic ( -- the number of BRAMs to use -- supported values are: -- 1,2,4,8,18 NUM_BRAMS : integer := 0; -- BRAM read address latency -- -- value meaning -- ==================================================== -- 0 BRAM read address port sample -- 1 BRAM read address port sample and a pipeline stage on the address port RAM_RADDR_LATENCY : integer := 1; -- BRAM read data latency -- -- value meaning -- ==================================================== -- 1 no BRAM OREG -- 2 use BRAM OREG -- 3 use BRAM OREG and a pipeline stage on the data port RAM_RDATA_LATENCY : integer := 1; -- BRAM write latency -- The BRAM write port is synchronous -- -- value meaning -- ==================================================== -- 0 BRAM write port sample -- 1 BRAM write port sample plus pipeline stage RAM_WRITE_LATENCY : integer := 1 ); port ( user_clk_i : in std_logic; reset_i : in std_logic; wen : in std_logic; waddr : in std_logic_vector(12 downto 0); wdata : in std_logic_vector(71 downto 0); ren : in std_logic; rce : in std_logic; raddr : in std_logic_vector(12 downto 0); rdata : out std_logic_vector(71 downto 0) ); end pcie_brams_v6; architecture v6_pcie of pcie_brams_v6 is component pcie_bram_v6 is generic ( DOB_REG : integer; WIDTH : integer ); port ( user_clk_i : in std_logic; reset_i : in std_logic; wen_i : in std_logic; waddr_i : in std_logic_vector(12 downto 0); wdata_i : in std_logic_vector(WIDTH - 1 downto 0); ren_i : in std_logic; rce_i : in std_logic; raddr_i : in std_logic_vector(12 downto 0); rdata_o : out std_logic_vector(WIDTH - 1 downto 0) ); end component; FUNCTION to_integer ( in_val : IN boolean) RETURN integer IS BEGIN IF (in_val) THEN RETURN(1); ELSE RETURN(0); END IF; END to_integer; -- turn on the bram output register constant DOB_REG : integer := to_integer(RAM_RDATA_LATENCY > 1); -- calculate the data width of the individual brams function width ( constant NUM_BRAM : integer) return integer is variable WIDTH_BRAM : integer := 1; begin -- width if (NUM_BRAM = 1) then WIDTH_BRAM := 72; elsif (NUM_BRAM = 2) then WIDTH_BRAM := 36; elsif (NUM_BRAM = 4) then WIDTH_BRAM := 18; elsif (NUM_BRAM = 8) then WIDTH_BRAM := 9; else WIDTH_BRAM := 4; end if; return WIDTH_BRAM; end width; constant BRAM_WIDTH : integer := width(NUM_BRAMS); constant TCQ : integer := 1; signal wen_int : std_logic; signal waddr_int : std_logic_vector(12 downto 0); signal wdata_int : std_logic_vector(71 downto 0); signal wen_dly : std_logic := '0'; signal waddr_dly : std_logic_vector(12 downto 0) := (others => '0'); signal wdata_dly : std_logic_vector(71 downto 0) := (others => '0'); -- if (RAM_WRITE_LATENCY == 1) -- model the delays for ram read latency signal ren_int : std_logic; signal raddr_int : std_logic_vector(12 downto 0); signal rdata_int : std_logic_vector(71 downto 0); signal ren_dly : std_logic; signal raddr_dly : std_logic_vector(12 downto 0); signal rdata_dly : std_logic_vector(71 downto 0); begin --synthesis translate_off process begin -- $display("[%t] %m NUM_BRAMS %0d DOB_REG %0d WIDTH %0d RAM_WRITE_LATENCY %0d RAM_RADDR_LATENCY %0d RAM_RDATA_LATENCY %0d", now, to_stdlogic(NUM_BRAMS), to_stdlogicvector(DOB_REG, 13), ("00000000000000000000000000000000000000000000000000000000000000000" & WIDTH), to_stdlogic(RAM_WRITE_LATENCY), to_stdlogic(RAM_RADDR_LATENCY), to_stdlogicvector(RAM_RDATA_LATENCY, 13)); case NUM_BRAMS is when 1 | 2 | 4 | 8 | 18 => when others => -- $display("[%t] %m Error NUM_BRAMS %0d not supported", now, to_stdlogic(NUM_BRAMS)); -- $finish(); end case; -- case(NUM_BRAMS) case RAM_RADDR_LATENCY is when 0 | 1 => when others => -- $display("[%t] %m Error RAM_READ_LATENCY %0d not supported", now, to_stdlogic(RAM_RADDR_LATENCY)); -- $finish(); end case; -- case (RAM_RADDR_LATENCY) case RAM_RDATA_LATENCY is when 1 | 2 | 3 => when others => -- $display("[%t] %m Error RAM_READ_LATENCY %0d not supported", now, to_stdlogic(RAM_RDATA_LATENCY)); -- $finish(); end case; -- case (RAM_RDATA_LATENCY) case RAM_WRITE_LATENCY is when 0 | 1 => when others => -- $display("[%t] %m Error RAM_WRITE_LATENCY %0d not supported", now, to_stdlogic(RAM_WRITE_LATENCY)); -- $finish(); end case; -- case(RAM_WRITE_LATENCY) wait; end process; --synthesis translate_on -- model the delays for ram write latency wr_lat_2 : if (RAM_WRITE_LATENCY = 1) generate process (user_clk_i) begin if (user_clk_i'event and user_clk_i = '1') then if (reset_i = '1') then wen_dly <= '0' after (TCQ)*1 ps; waddr_dly <= "0000000000000" after (TCQ)*1 ps; wdata_dly <= "000000000000000000000000000000000000000000000000000000000000000000000000" after (TCQ)*1 ps; else wen_dly <= wen after (TCQ)*1 ps; waddr_dly <= waddr after (TCQ)*1 ps; wdata_dly <= wdata after (TCQ)*1 ps; end if; end if; end process; wen_int <= wen_dly; waddr_int <= waddr_dly; wdata_int <= wdata_dly; end generate; wr_lat_1 : if (RAM_WRITE_LATENCY = 0) generate wen_int <= wen; waddr_int <= waddr; wdata_int <= wdata; end generate; raddr_lat_2 : if (RAM_RADDR_LATENCY = 1) generate process (user_clk_i) begin if (user_clk_i'event and user_clk_i = '1') then if (reset_i = '1') then ren_dly <= '0' after (TCQ)*1 ps; raddr_dly <= "0000000000000" after (TCQ)*1 ps; else ren_dly <= ren after (TCQ)*1 ps; raddr_dly <= raddr after (TCQ)*1 ps; end if; -- else: !if(reset_i) end if; end process; ren_int <= ren_dly; raddr_int <= raddr_dly; end generate; -- block: rd_lat_addr_2 raddr_lat_1 : if (not(RAM_RADDR_LATENCY = 1)) generate ren_int <= ren; raddr_int <= raddr; end generate; rdata_lat_3 : if (RAM_RDATA_LATENCY = 3) generate process (user_clk_i) begin if (user_clk_i'event and user_clk_i = '1') then if (reset_i = '1') then rdata_dly <= "000000000000000000000000000000000000000000000000000000000000000000000000" after (TCQ)*1 ps; else rdata_dly <= rdata_int after (TCQ)*1 ps; end if; -- else: !if(reset_i) end if; end process; rdata <= rdata_dly; end generate; -- block: rd_lat_data_3 rdata_lat_1_2 : if (not(RAM_RDATA_LATENCY = 3)) generate rdata <= rdata_int after (TCQ)*1 ps; end generate; -- instantiate the brams brams : for i in 0 to NUM_BRAMS - 1 generate ram : pcie_bram_v6 generic map ( DOB_REG => DOB_REG, WIDTH => BRAM_WIDTH ) port map ( user_clk_i => user_clk_i, reset_i => reset_i, wen_i => wen_int, waddr_i => waddr_int, wdata_i => wdata_int((((i + 1) * BRAM_WIDTH) - 1) downto (i * BRAM_WIDTH)), ren_i => ren_int, raddr_i => raddr_int, rdata_o => rdata_int((((i + 1) * BRAM_WIDTH) - 1) downto (i * BRAM_WIDTH)), rce_i => rce ); end generate; -- pcie_brams_v6 end v6_pcie;
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