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[/] [w11/] [tags/] [w11a_V0.61/] [rtl/] [vlib/] [memlib/] [ram_1swar_1ar_gen_unisim.vhd] - Rev 36
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-- $Id: ram_1swar_1ar_gen_unisim.vhd 314 2010-07-09 17:38:41Z mueller $ -- -- Copyright 2008-2010 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: ram_1swar_1ar_gen - syn -- Description: Dual-Port RAM with with one synchronous write and two -- asynchronius read ports (as distributed RAM). -- Direct instantiation of Xilinx UNISIM primitives -- -- Dependencies: - -- Test bench: - -- 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 -- 2010-06-03 300 1.1 add hack for AW=5 for Spartan's -- 2008-03-08 123 1.0.1 use shorter label names -- 2008-03-02 122 1.0 Initial version ------------------------------------------------------------------------------ library ieee; use ieee.std_logic_1164.all; library unisim; use unisim.vcomponents.ALL; use work.slvtypes.all; entity ram_1swar_1ar_gen is -- RAM, 1 sync w asyn r + 1 asyn r port generic ( AWIDTH : positive := 4; -- address port width DWIDTH : positive := 16); -- data port width port ( CLK : in slbit; -- clock WE : in slbit; -- write enable (port A) ADDRA : in slv(AWIDTH-1 downto 0); -- address port A ADDRB : in slv(AWIDTH-1 downto 0); -- address port B DI : in slv(DWIDTH-1 downto 0); -- data in (port A) DOA : out slv(DWIDTH-1 downto 0); -- data out port A DOB : out slv(DWIDTH-1 downto 0) -- data out port B ); end ram_1swar_1ar_gen; architecture syn of ram_1swar_1ar_gen is begin assert AWIDTH>=4 and AWIDTH<=5 report "assert(AWIDTH>=4 and AWIDTH<=5): only 4..5 bit AWIDTH supported" severity failure; AW_4: if AWIDTH = 4 generate GL: for i in DWIDTH-1 downto 0 generate MEM : RAM16X1D generic map ( INIT => X"0000") port map ( DPO => DOB(i), SPO => DOA(i), A0 => ADDRA(0), A1 => ADDRA(1), A2 => ADDRA(2), A3 => ADDRA(3), D => DI(i), DPRA0 => ADDRB(0), DPRA1 => ADDRB(1), DPRA2 => ADDRB(2), DPRA3 => ADDRB(3), WCLK => CLK, WE => WE ); end generate GL; end generate AW_4; -- Note: Spartan-3 doesn't support RAM32X1D, therefore this kludge.. AW_5: if AWIDTH = 5 generate signal WE0 : slbit := '0'; signal WE1 : slbit := '0'; signal DOA0 : slv(DWIDTH-1 downto 0) := (others=>'0'); signal DOA1 : slv(DWIDTH-1 downto 0) := (others=>'0'); signal DOB0 : slv(DWIDTH-1 downto 0) := (others=>'0'); signal DOB1 : slv(DWIDTH-1 downto 0) := (others=>'0'); begin WE0 <= WE and not ADDRA(4); WE1 <= WE and ADDRA(4); GL: for i in DWIDTH-1 downto 0 generate MEM0 : RAM16X1D generic map ( INIT => X"0000") port map ( DPO => DOB0(i), SPO => DOA0(i), A0 => ADDRA(0), A1 => ADDRA(1), A2 => ADDRA(2), A3 => ADDRA(3), D => DI(i), DPRA0 => ADDRB(0), DPRA1 => ADDRB(1), DPRA2 => ADDRB(2), DPRA3 => ADDRB(3), WCLK => CLK, WE => WE0 ); MEM1 : RAM16X1D generic map ( INIT => X"0000") port map ( DPO => DOB1(i), SPO => DOA1(i), A0 => ADDRA(0), A1 => ADDRA(1), A2 => ADDRA(2), A3 => ADDRA(3), D => DI(i), DPRA0 => ADDRB(0), DPRA1 => ADDRB(1), DPRA2 => ADDRB(2), DPRA3 => ADDRB(3), WCLK => CLK, WE => WE1 ); DOA <= DOA0 when ADDRA(4)='0' else DOA1; DOB <= DOB0 when ADDRB(4)='0' else DOB1; end generate GL; end generate AW_5; -- AW_6: if AWIDTH = 6 generate -- GL: for i in DWIDTH-1 downto 0 generate -- MEM : RAM64X1D -- generic map ( -- INIT => X"0000000000000000") -- port map ( -- DPO => DOB(i), -- SPO => DOA(i), -- A0 => ADDRA(0), -- A1 => ADDRA(1), -- A2 => ADDRA(2), -- A3 => ADDRA(3), -- A4 => ADDRA(4), -- A5 => ADDRA(5), -- D => DI(i), -- DPRA0 => ADDRB(0), -- DPRA1 => ADDRB(1), -- DPRA2 => ADDRB(2), -- DPRA3 => ADDRB(3), -- DPRA4 => ADDRB(4), -- DPRA5 => ADDRB(5), -- WCLK => CLK, -- WE => WE -- ); -- end generate GL; -- end generate AW_6; end syn; -- Note: The VHDL instantiation example in the 8.1i Librariers Guide is wrong. -- The annotation states that DPO is the port A output and SPO is port B -- output. The text before is correct, DPO is port B and SPO is port A.
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