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[/] [t400/] [tags/] [rel_0_1_beta/] [rtl/] [vhdl/] [t400_io_d.vhd] - Rev 176
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------------------------------------------------------------------------------- -- -- The D port controller. -- -- $Id: t400_io_d.vhd,v 1.2 2006-05-07 02:24:16 arniml Exp $ -- -- Copyright (c) 2006 Arnim Laeuger (arniml@opencores.org) -- -- All rights reserved -- -- Redistribution and use in source and synthezised forms, with or without -- modification, are permitted provided that the following conditions are met: -- -- Redistributions of source code must retain the above copyright notice, -- this list of conditions and the following disclaimer. -- -- Redistributions in synthesized form must reproduce the above copyright -- notice, this list of conditions and the following disclaimer in the -- documentation and/or other materials provided with the distribution. -- -- Neither the name of the author nor the names of other contributors may -- be used to endorse or promote products derived from this software without -- specific prior written permission. -- -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" -- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, -- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR -- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE -- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -- POSSIBILITY OF SUCH DAMAGE. -- -- Please report bugs to the author, but before you do so, please -- make sure that this is not a derivative work and that -- you have the latest version of this file. -- -- The latest version of this file can be found at: -- http://www.opencores.org/cvsweb.shtml/t400/ -- ------------------------------------------------------------------------------- library ieee; use ieee.std_logic_1164.all; use work.t400_opt_pack.all; use work.t400_pack.all; entity t400_io_d is generic ( opt_out_type_3_g : integer := t400_opt_out_type_std_c; opt_out_type_2_g : integer := t400_opt_out_type_std_c; opt_out_type_1_g : integer := t400_opt_out_type_std_c; opt_out_type_0_g : integer := t400_opt_out_type_std_c ); port ( -- System Interface ------------------------------------------------------- ck_i : in std_logic; ck_en_i : in boolean; por_i : in boolean; res_i : in boolean; -- Control Interface ------------------------------------------------------ op_i : in io_d_op_t; bd_i : in bd_t; -- Port D Interface ------------------------------------------------------- io_d_o : out dw_t; io_d_en_o : out dw_t ); end t400_io_d; use work.t400_io_pack.all; architecture rtl of t400_io_d is signal d_q : dw_t; signal vdd_s : std_logic; begin vdd_s <= '1'; ----------------------------------------------------------------------------- -- Process d_reg -- -- Purpose: -- Implements the D output register. -- d_reg: process (ck_i, por_i) begin if por_i then d_q <= (others => '0'); elsif ck_i'event and ck_i = '1' then if res_i then -- synchronous reset upon external reset event d_q <= (others => '0'); elsif ck_en_i then if op_i = IOD_LOAD then d_q <= bd_i; end if; end if; end if; end process d_reg; -- ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- -- Process out_driver -- -- Purpose: -- Implements the output driver data and enable. -- out_driver: process (d_q, vdd_s) begin -- bit 3 io_d_o(3) <= io_out_f(dat => d_q(3), opt => opt_out_type_3_g); io_d_en_o(3) <= io_en_f (en => vdd_s, dat => d_q(3), opt => opt_out_type_3_g); -- bit 2 io_d_o(2) <= io_out_f(dat => d_q(2), opt => opt_out_type_2_g); io_d_en_o(2) <= io_en_f (en => vdd_s, dat => d_q(2), opt => opt_out_type_2_g); -- bit 1 io_d_o(1) <= io_out_f(dat => d_q(1), opt => opt_out_type_1_g); io_d_en_o(1) <= io_en_f (en => vdd_s, dat => d_q(1), opt => opt_out_type_1_g); -- bit 0 io_d_o(0) <= io_out_f(dat => d_q(0), opt => opt_out_type_0_g); io_d_en_o(0) <= io_en_f (en => vdd_s, dat => d_q(0), opt => opt_out_type_0_g); end process out_driver; -- ----------------------------------------------------------------------------- end rtl; ------------------------------------------------------------------------------- -- File History: -- -- $Log: not supported by cvs2svn $ -- Revision 1.1.1.1 2006/05/06 01:56:44 arniml -- import from local CVS repository, LOC_CVS_0_1 -- -------------------------------------------------------------------------------