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[/] [w11/] [tags/] [w11a_V0.5/] [rtl/] [vlib/] [memlib/] [fifo_1c_dram.vhd] - Rev 37
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-- $Id: fifo_1c_dram.vhd 314 2010-07-09 17:38:41Z mueller $ -- -- Copyright 2007- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de> -- -- This program is free software; you may redistribute and/or modify it under -- the terms of the GNU General Public License as published by the Free -- Software Foundation, either version 2, or at your option any later version. -- -- This program is distributed in the hope that it will be useful, but -- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- for complete details. -- ------------------------------------------------------------------------------ -- Module Name: fifo_1c_dram - syn -- Description: FIFO, single clock domain, distributed RAM based, with -- enable/busy/valid/hold interface. -- -- Dependencies: fifo_1c_dram_raw -- -- Test bench: tb/tb_fifo_1c_dram -- Target Devices: generic Spartan, Virtex -- Tool versions: xst 8.1, 8.2, 9.1, 9.2; ghdl 0.18-0.25 -- Revision History: -- Date Rev Version Comment -- 2007-06-06 49 1.0 Initial version -- -- Some synthesis results: -- - 2007-12-27 ise 8.2.03 for xc3s1000-ft256-4: -- AWIDTH DWIDTH LUT.l LUT.m Flop clock(xst est.) -- 4 16 31 32 22 153MHz ( 16 words) -- 5 16 49 64 23 120MHz ( 32 words) -- 6 16 70 128 23 120MHz ( 64 words) -- 7 16 111 256 30 120MHz (128 words) ------------------------------------------------------------------------------ library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use work.slvtypes.all; use work.memlib.all; entity fifo_1c_dram is -- fifo, 1 clock, dram based generic ( AWIDTH : positive := 7; -- address width (sets size) DWIDTH : positive := 16); -- data width port ( CLK : in slbit; -- clock RESET : in slbit; -- reset DI : in slv(DWIDTH-1 downto 0); -- input data ENA : in slbit; -- write enable BUSY : out slbit; -- write port hold DO : out slv(DWIDTH-1 downto 0); -- output data VAL : out slbit; -- read valid HOLD : in slbit; -- read hold SIZE : out slv(AWIDTH downto 0) -- number of used slots ); end fifo_1c_dram; architecture syn of fifo_1c_dram is signal WE : slbit := '0'; signal RE : slbit := '0'; signal SIZE_L : slv(AWIDTH-1 downto 0) := (others=>'0'); signal EMPTY : slbit := '0'; signal FULL : slbit := '0'; begin FIFO : fifo_1c_dram_raw generic map ( AWIDTH => AWIDTH, DWIDTH => DWIDTH) port map ( CLK => CLK, RESET => RESET, WE => WE, RE => RE, DI => DI, DO => DO, SIZE => SIZE_L, EMPTY => EMPTY, FULL => FULL ); WE <= ENA and (not FULL); RE <= (not EMPTY) and (not HOLD); BUSY <= FULL; VAL <= not EMPTY; SIZE <= FULL & SIZE_L; end syn;
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