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[/] [t400/] [tags/] [rel_0_1_beta/] [rtl/] [vhdl/] [t400_io_l.vhd] - Rev 114
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------------------------------------------------------------------------------- -- -- The L port controller. -- -- $Id: t400_io_l.vhd,v 1.4 2006-06-05 20:33:24 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_l is generic ( opt_out_type_7_g : integer := t400_opt_out_type_std_c; opt_out_type_6_g : integer := t400_opt_out_type_std_c; opt_out_type_5_g : integer := t400_opt_out_type_std_c; opt_out_type_4_g : integer := t400_opt_out_type_std_c; 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; opt_microbus_g : integer := t400_opt_no_microbus_c ); port ( -- System Interface ------------------------------------------------------- ck_i : in std_logic; ck_en_i : in boolean; por_i : in boolean; in_en_i : in boolean; -- Control Interface ------------------------------------------------------ op_i : in io_l_op_t; en2_i : in std_logic; m_i : in dw_t; a_i : in dw_t; pm_data_i : in byte_t; q_o : out byte_t; -- Microbus Interface ----------------------------------------------------- cs_n_i : in std_logic; rd_n_i : in std_logic; wr_n_i : in std_logic; -- Port L Interface ------------------------------------------------------- io_l_i : in byte_t; io_l_o : out byte_t; io_l_en_o : out byte_t ); end t400_io_l; use work.t400_io_pack.all; architecture rtl of t400_io_l is signal q_q : byte_t; signal en2_s : std_logic; begin ----------------------------------------------------------------------------- -- Process q_reg -- -- Purpose: -- Implements the Q register. -- q_reg: process (ck_i, por_i) begin if por_i then q_q <= (others => '0'); elsif ck_i'event and ck_i = '1' then if ck_en_i then case op_i is -- Load Q from accumulator and data memory -------------------------- when IOL_LOAD_AM => q_q(7 downto 4) <= a_i; q_q(3 downto 0) <= m_i; -- Load Q from program memory --------------------------------------- when IOL_LOAD_PM => q_q <= pm_data_i; when others => null; end case; end if; -- Microbus functionality if opt_microbus_g = t400_opt_microbus_c and cs_n_i = '0' and wr_n_i = '0' then q_q <= to_X01(io_l_i); end if; end if; end process q_reg; -- ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- -- Multiplexer providing read data to the system. ----------------------------------------------------------------------------- q_o <= to_X01(io_l_i) when op_i = IOL_OUTPUT_L else q_q; ----------------------------------------------------------------------------- -- Dedicated output enable when in Microbus mode ----------------------------------------------------------------------------- en2_s <= cs_n_i nor rd_n_i when opt_microbus_g = t400_opt_microbus_c else en2_i; ----------------------------------------------------------------------------- -- Process out_driver -- -- Purpose: -- Implements the output driver data and enable. -- out_driver: process (en2_s, q_q) begin -- bit 7 io_l_o(7) <= io_out_f(dat => q_q(7), opt => opt_out_type_7_g); io_l_en_o(7) <= io_en_f (en => en2_s, dat => q_q(7), opt => opt_out_type_7_g); -- bit 6 io_l_o(6) <= io_out_f(dat => q_q(6), opt => opt_out_type_6_g); io_l_en_o(6) <= io_en_f (en => en2_s, dat => q_q(6), opt => opt_out_type_6_g); -- bit 5 io_l_o(5) <= io_out_f(dat => q_q(5), opt => opt_out_type_5_g); io_l_en_o(5) <= io_en_f (en => en2_s, dat => q_q(5), opt => opt_out_type_5_g); -- bit 4 io_l_o(4) <= io_out_f(dat => q_q(4), opt => opt_out_type_4_g); io_l_en_o(4) <= io_en_f (en => en2_s, dat => q_q(4), opt => opt_out_type_4_g); -- bit 3 io_l_o(3) <= io_out_f(dat => q_q(3), opt => opt_out_type_3_g); io_l_en_o(3) <= io_en_f (en => en2_s, dat => q_q(3), opt => opt_out_type_3_g); -- bit 2 io_l_o(2) <= io_out_f(dat => q_q(2), opt => opt_out_type_2_g); io_l_en_o(2) <= io_en_f (en => en2_s, dat => q_q(2), opt => opt_out_type_2_g); -- bit 1 io_l_o(1) <= io_out_f(dat => q_q(1), opt => opt_out_type_1_g); io_l_en_o(1) <= io_en_f (en => en2_s, dat => q_q(1), opt => opt_out_type_1_g); -- bit 0 io_l_o(0) <= io_out_f(dat => q_q(0), opt => opt_out_type_0_g); io_l_en_o(0) <= io_en_f (en => en2_s, dat => q_q(0), opt => opt_out_type_0_g); end process out_driver; -- ----------------------------------------------------------------------------- end rtl; ------------------------------------------------------------------------------- -- File History: -- -- $Log: not supported by cvs2svn $ -- Revision 1.3 2006/06/05 14:21:21 arniml -- latch io_l_i upon input enable trigger -- -- Revision 1.2 2006/05/23 01:14:28 arniml -- use to_X01 for primary input bus -- -- Revision 1.1.1.1 2006/05/06 01:56:44 arniml -- import from local CVS repository, LOC_CVS_0_1 -- -------------------------------------------------------------------------------
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