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[/] [w11/] [tags/] [w11a_V0.74/] [rtl/] [vlib/] [memlib/] [ram_1swsr_xfirst_gen_unisim.vhd] - Rev 12
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-- $Id: ram_1swsr_xfirst_gen_unisim.vhd 406 2011-08-14 21:06:44Z mueller $ -- -- Copyright 2008-2011 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_1swsr_xfirst_gen_unisim - syn -- Description: Single-Port RAM with with one synchronous read/write port -- Direct instantiation of Xilinx UNISIM primitives -- -- Dependencies: - -- Test bench: - -- Target Devices: Spartan-3, Virtex-2,-4 -- Tool versions: xst 8.1, 8.2, 9.1, 9.2,.., 13.1; ghdl 0.18-0.25 -- Revision History: -- Date Rev Version Comment -- 2011-08-14 406 1.0.2 cleaner code for L_DI initialization -- 2008-04-13 135 1.0.1 fix range error for AW_14_S1 -- 2008-03-08 123 1.0 Initial version ------------------------------------------------------------------------------ library ieee; use ieee.std_logic_1164.all; library unisim; use unisim.vcomponents.ALL; use work.slvtypes.all; entity ram_1swsr_xfirst_gen_unisim is -- RAM, 1 sync r/w ports generic ( AWIDTH : positive := 11; -- address port width DWIDTH : positive := 9; -- data port width WRITE_MODE : string := "READ_FIRST"); -- write mode: (READ|WRITE)_FIRST port( CLK : in slbit; -- clock EN : in slbit; -- enable WE : in slbit; -- write enable ADDR : in slv(AWIDTH-1 downto 0); -- address DI : in slv(DWIDTH-1 downto 0); -- data in DO : out slv(DWIDTH-1 downto 0) -- data out ); end ram_1swsr_xfirst_gen_unisim; architecture syn of ram_1swsr_xfirst_gen_unisim is constant ok_mod32 : boolean := (DWIDTH mod 32)=0 and ((DWIDTH+35)/36)=((DWIDTH+31)/32); constant ok_mod16 : boolean := (DWIDTH mod 16)=0 and ((DWIDTH+17)/18)=((DWIDTH+16)/16); constant ok_mod08 : boolean := (DWIDTH mod 32)=0 and ((DWIDTH+8)/9)=((DWIDTH+7)/8); begin assert AWIDTH>=9 and AWIDTH<=14 report "assert(AWIDTH>=9 and AWIDTH<=14): unsupported BRAM from factor" severity failure; AW_09_S36: if AWIDTH=9 and not ok_mod32 generate constant dw_mem : positive := ((DWIDTH+35)/36)*36; signal L_DO : slv(dw_mem-1 downto 0) := (others=> '0'); signal L_DI : slv(dw_mem-1 downto 0) := (others=> '0'); begin DI_PAD: if dw_mem>DWIDTH generate L_DI(dw_mem-1 downto DWIDTH) <= (others=>'0'); end generate DI_PAD; L_DI(DI'range) <= DI; GL: for i in dw_mem/36-1 downto 0 generate MEM : RAMB16_S36 generic map ( INIT => O"000000000000", SRVAL => O"000000000000", WRITE_MODE => WRITE_MODE) port map ( DO => L_DO(36*i+31 downto 36*i), DOP => L_DO(36*i+35 downto 36*i+32), ADDR => ADDR, CLK => CLK, DI => L_DI(36*i+31 downto 36*i), DIP => L_DI(36*i+35 downto 36*i+32), EN => EN, SSR => '0', WE => WE ); end generate GL; DO <= L_DO(DO'range); end generate AW_09_S36; AW_09_S32: if AWIDTH=9 and ok_mod32 generate GL: for i in DWIDTH/32-1 downto 0 generate MEM : RAMB16_S36 generic map ( INIT => X"00000000", SRVAL => X"00000000", WRITE_MODE => WRITE_MODE) port map ( DO => DO(32*i+31 downto 32*i), DOP => open, ADDR => ADDR, CLK => CLK, DI => DI(32*i+31 downto 32*i), DIP => "0000", EN => EN, SSR => '0', WE => WE ); end generate GL; end generate AW_09_S32; AW_10_S18: if AWIDTH=10 and not ok_mod16 generate constant dw_mem : positive := ((DWIDTH+17)/18)*18; signal L_DO : slv(dw_mem-1 downto 0) := (others=> '0'); signal L_DI : slv(dw_mem-1 downto 0) := (others=> '0'); begin DI_PAD: if dw_mem>DWIDTH generate L_DI(dw_mem-1 downto DWIDTH) <= (others=>'0'); end generate DI_PAD; L_DI(DI'range) <= DI; GL: for i in dw_mem/18-1 downto 0 generate MEM : RAMB16_S18 generic map ( INIT => O"000000", SRVAL => O"000000", WRITE_MODE => WRITE_MODE) port map ( DO => L_DO(18*i+15 downto 18*i), DOP => L_DO(18*i+17 downto 18*i+16), ADDR => ADDR, CLK => CLK, DI => L_DI(18*i+15 downto 18*i), DIP => L_DI(18*i+17 downto 18*i+16), EN => EN, SSR => '0', WE => WE ); end generate GL; DO <= L_DO(DO'range); end generate AW_10_S18; AW_10_S16: if AWIDTH=10 and ok_mod16 generate GL: for i in DWIDTH/16-1 downto 0 generate MEM : RAMB16_S18 generic map ( INIT => X"0000", SRVAL => X"0000", WRITE_MODE => WRITE_MODE) port map ( DO => DO(16*i+15 downto 16*i), DOP => open, ADDR => ADDR, CLK => CLK, DI => DI(16*i+15 downto 16*i), DIP => "00", EN => EN, SSR => '0', WE => WE ); end generate GL; end generate AW_10_S16; AW_11_S9: if AWIDTH=11 and not ok_mod08 generate constant dw_mem : positive := ((DWIDTH+8)/9)*9; signal L_DO : slv(dw_mem-1 downto 0) := (others=> '0'); signal L_DI : slv(dw_mem-1 downto 0) := (others=> '0'); begin DI_PAD: if dw_mem>DWIDTH generate L_DI(dw_mem-1 downto DWIDTH) <= (others=>'0'); end generate DI_PAD; L_DI(DI'range) <= DI; GL: for i in dw_mem/9-1 downto 0 generate MEM : RAMB16_S9 generic map ( INIT => O"000", SRVAL => O"000", WRITE_MODE => WRITE_MODE) port map ( DO => L_DO(9*i+7 downto 9*i), DOP => L_DO(9*i+8 downto 9*i+8), ADDR => ADDR, CLK => CLK, DI => L_DI(9*i+7 downto 9*i), DIP => L_DI(9*i+8 downto 9*i+8), EN => EN, SSR => '0', WE => WE ); end generate GL; DO <= L_DO(DO'range); end generate AW_11_S9; AW_11_S8: if AWIDTH=11 and ok_mod08 generate GL: for i in DWIDTH/8-1 downto 0 generate MEM : RAMB16_S9 generic map ( INIT => X"00", SRVAL => X"00", WRITE_MODE => WRITE_MODE) port map ( DO => DO(8*i+7 downto 8*i), DOP => open, ADDR => ADDR, CLK => CLK, DI => DI(8*i+7 downto 8*i), DIP => "0", EN => EN, SSR => '0', WE => WE ); end generate GL; end generate AW_11_S8; AW_12_S4: if AWIDTH = 12 generate constant dw_mem : positive := ((DWIDTH+3)/4)*4; signal L_DO : slv(dw_mem-1 downto 0) := (others=> '0'); signal L_DI : slv(dw_mem-1 downto 0) := (others=> '0'); begin DI_PAD: if dw_mem>DWIDTH generate L_DI(dw_mem-1 downto DWIDTH) <= (others=>'0'); end generate DI_PAD; L_DI(DI'range) <= DI; GL: for i in dw_mem/4-1 downto 0 generate MEM : RAMB16_S4 generic map ( INIT => X"0", SRVAL => X"0", WRITE_MODE => WRITE_MODE) port map ( DO => L_DO(4*i+3 downto 4*i), ADDR => ADDR, CLK => CLK, DI => L_DI(4*i+3 downto 4*i), EN => EN, SSR => '0', WE => WE ); end generate GL; DO <= L_DO(DO'range); end generate AW_12_S4; AW_13_S2: if AWIDTH = 13 generate constant dw_mem : positive := ((DWIDTH+1)/2)*2; signal L_DO : slv(dw_mem-1 downto 0) := (others=> '0'); signal L_DI : slv(dw_mem-1 downto 0) := (others=> '0'); begin DI_PAD: if dw_mem>DWIDTH generate L_DI(dw_mem-1 downto DWIDTH) <= (others=>'0'); end generate DI_PAD; L_DI(DI'range) <= DI; GL: for i in dw_mem/2-1 downto 0 generate MEM : RAMB16_S2 generic map ( INIT => "00", SRVAL => "00", WRITE_MODE => WRITE_MODE) port map ( DO => L_DO(2*i+1 downto 2*i), ADDR => ADDR, CLK => CLK, DI => L_DI(2*i+1 downto 2*i), EN => EN, SSR => '0', WE => WE ); end generate GL; DO <= L_DO(DO'range); end generate AW_13_S2; AW_14_S1: if AWIDTH = 14 generate GL: for i in DWIDTH-1 downto 0 generate MEM : RAMB16_S1 generic map ( INIT => "0", SRVAL => "0", WRITE_MODE => WRITE_MODE) port map ( DO => DO(i downto i), ADDR => ADDR, CLK => CLK, DI => DI(i downto i), EN => EN, SSR => '0', WE => WE ); end generate GL; end generate AW_14_S1; end syn; -- Note: in XST 8.2 the defaults for INIT_(A|B) and SRVAL_(A|B) are -- nonsense: INIT_A : bit_vector := X"000"; -- This is a 12 bit value, while a 9 bit one is needed. Thus the -- explicit definition above.
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