-- -----------------------------------------------------------------------------
-- GLUE LOGIC BETWEEN IrDA/RS232/TEXT_BUFFER EPLD and COMPRESSION/RSA FLEXs --
-- -----------------------------------------------------------------------------
--
-- File : 'glue.vhd'
-- Author : Lars Larsson
--
-- Date : February 10, 1999
--
-- Description : The design is a pice of glue logic between the EPM7160SLC84
-- (IrDA-CoDec, RS232-UART, TEXT_BUFFER with RAM controller EPLD)
-- and two EPF10K10LC84 (data compressor/decompressor plus RSA
-- processor FPGA) mounted on our FPGA-Praktikum PCB board.
--
-- Hint : File 'components.vhd' (package components) is required.
--
-- -----------------------------------------------------------------------------
--
-- Copyright (C) 1999 Lars Larsson, Dept. of Computer Science
-- University of Hamburg
-- Vogt-Koelln-Str. 30
-- D - 22041 Hamburg, Germany
-- larsson@informatik.uni-hamburg.de
-- http://tech-www.informatik.uni-hamburg.de/~larsson
--
-- This program is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, 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 more details.
--
-- You should have received a copy of the GNU General Public License along
-- with this program; if not, write to the Free Software Foundation, Inc.,
-- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
--
-- -----------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
entity glue is
port(
clk : in std_ulogic; -- clock = 16 MHz
nrst : in std_ulogic; -- *reset
nsend_receive : in std_ulogic; -- (0:send,1:receive)
rs232receiver_busy : out std_ulogic; -- to HOLD input of RS232 receiver/text / text buffer
rs232receiver_request : in std_ulogic; -- from send output of RS232 receiver / text buffer
rs232receiver_idata : in std_ulogic_vector ( 7 downto 0); -- from data byte output of RS232 receiver
rs232sender_hold : in std_ulogic; -- from busy output of RS232 sender
rs232sender_send : out std_ulogic; -- to request input of RS232 sender
rs232sender_odata : out std_ulogic_vector ( 7 downto 0); -- to data byte input of RS232 sender
to_flex : out std_logic; -- TriState IO contol for FLEXs
flex_iodata : inout std_logic_vector ( 7 downto 0); -- TriState bus between EPLD, FLEXA, FLEXB
flex_busy : out std_logic; -- to hold input of FLEX
flex_request : in std_logic; -- from send output of FLEX
flex_hold : in std_logic; -- from busy output of FLEX
flex_send : out std_logic -- to request input of FLEX
);
end glue;
architecture behavior of glue is
signal to_flex_s : std_logic;
begin
rs232receiver_busy <= flex_hold;
rs232sender_send <= flex_request;
to_flex_s <= rs232receiver_request;
to_flex <= to_flex_s;
flex_send <= to_flex_s;
flex_busy <= rs232sender_hold;
tristate_p : process ( to_flex_s, rs232receiver_idata )
begin
if (to_flex_s='1') then
flex_iodata <= To_StdLogicVector(rs232receiver_idata);
else
flex_iodata <= (others=>'Z');
end if;
end process;
rs232sender_odata <= To_StdULogicVector(flex_iodata);
end behavior;
-- -----------------------------------------------------------------------------
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