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-- $Id: iblib.vhd 427 2011-11-19 21:04:11Z 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.

--

------------------------------------------------------------------------------

-- Package Name:   iblib

-- Description:    Definitions for ibus interface and bus entities

--

-- Dependencies:   -

-- Tool versions:  xst 8.1, 8.2, 9.1, 9.2, 12.1; ghdl 0.18-0.29

-- Revision History: 

-- Date         Rev Version  Comment

-- 2010-10-23   335   2.0.1  add ib_sel; add ib_sres_or_mon

-- 2010-10-17   333   2.0    ibus V2 interface: use aval,re,we,rmw

-- 2010-06-11   303   1.1    added racc,cacc signals to ib_mreq_type

-- 2009-06-01   221   1.0.1  added dip signal to ib_mreq_type

-- 2008-08-22   161   1.0    Initial version (extracted from pdp11.vhd)

------------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

use work.slvtypes.all;

package iblib is

type ib_mreq_type is record             -- ibus - master request

  aval : slbit;                         -- address valid

  re   : slbit;                         -- read enable

  we   : slbit;                         -- write enable

  rmw  : slbit;                         -- read-modify-write

  be0  : slbit;                         -- byte enable low

  be1  : slbit;                         -- byte enable high

  cacc : slbit;                         -- console access

  racc : slbit;                         -- remote access

  addr : slv13_1;                       -- address bit(12:1)

  din  : slv16;                         -- data (input to slave)

end record ib_mreq_type;

constant ib_mreq_init : ib_mreq_type :=

  ('0','0','0','0',                     -- aval, re, we, rmw

   '0','0','0','0',                     -- be0, be1, cacc, racc

   (others=>'0'),                       -- addr

   (others=>'0'));                      -- din

type ib_sres_type is record             -- ibus - slave response

  ack  : slbit;                         -- acknowledge

  busy : slbit;                         -- busy

  dout : slv16;                         -- data (output from slave)

end record ib_sres_type;

constant ib_sres_init : ib_sres_type :=

  ('0','0',                             -- ack, busy

   (others=>'0'));                      -- dout

type ib_sres_vector is array (natural range <>) of ib_sres_type;

subtype ibf_byte1  is integer range 15 downto 8;

subtype ibf_byte0  is integer range  7 downto 0;

component ib_sel is                     -- ibus address select logic

  generic (

    IB_ADDR : slv16;                    -- ibus address base

    SAWIDTH : natural := 0);            -- device subaddress space width

  port (

    CLK : in slbit;                     -- clock

    IB_MREQ : in ib_mreq_type;          -- ibus request

    SEL : out slbit                     -- select state bit

  );

end component;

component ib_sres_or_2 is               -- ibus result or, 2 input

  port (

    IB_SRES_1 :  in ib_sres_type;                 -- ib_sres input 1

    IB_SRES_2 :  in ib_sres_type := ib_sres_init; -- ib_sres input 2

    IB_SRES_OR : out ib_sres_type       -- ib_sres or'ed output

  );

end component;

component ib_sres_or_3 is               -- ibus result or, 3 input

  port (

    IB_SRES_1 :  in ib_sres_type;                 -- ib_sres input 1

    IB_SRES_2 :  in ib_sres_type := ib_sres_init; -- ib_sres input 2

    IB_SRES_3 :  in ib_sres_type := ib_sres_init; -- ib_sres input 3

    IB_SRES_OR : out ib_sres_type       -- ib_sres or'ed output

  );

end component;

component ib_sres_or_4 is               -- ibus result or, 4 input

  port (

    IB_SRES_1 :  in ib_sres_type;                 -- ib_sres input 1

    IB_SRES_2 :  in ib_sres_type := ib_sres_init; -- ib_sres input 2

    IB_SRES_3 :  in ib_sres_type := ib_sres_init; -- ib_sres input 3

    IB_SRES_4 :  in ib_sres_type := ib_sres_init; -- ib_sres input 4

    IB_SRES_OR : out ib_sres_type       -- ib_sres or'ed output

  );

end component;

component ib_sres_or_gen is             -- ibus result or, generic

  generic (

    WIDTH : natural := 4);              -- number of input ports

  port (

    IB_SRES_IN : in ib_sres_vector(1 to WIDTH); -- ib_sres input array

    IB_SRES_OR : out ib_sres_type               -- ib_sres or'ed output

  );

end component;

type intmap_type is record              -- interrupt map entry type

  vec : integer;                        -- vector address

  pri : integer;                        -- priority

end record intmap_type;

constant intmap_init : intmap_type := (0,0);

type intmap_array_type is array (15 downto 0) of intmap_type;

constant intmap_array_init : intmap_array_type := (others=>intmap_init);

component ib_intmap is                  -- external interrupt mapper

  generic (

    INTMAP : intmap_array_type := intmap_array_init);

  port (

    EI_REQ : in slv16_1;                -- interrupt request lines

    EI_ACKM : in slbit;                 -- interrupt acknowledge (from master)

    EI_ACK : out slv16_1;               -- interrupt acknowledge (to requestor)

    EI_PRI : out slv3;                  -- interrupt priority

    EI_VECT : out slv9_2                -- interrupt vector

  );

end component;

--

-- components for use in test benches (not synthesizable)

--

component ib_sres_or_mon is             -- ibus result or monitor

  port (

    IB_SRES_1 :  in ib_sres_type;                 -- ib_sres input 1

    IB_SRES_2 :  in ib_sres_type := ib_sres_init; -- ib_sres input 2

    IB_SRES_3 :  in ib_sres_type := ib_sres_init; -- ib_sres input 3

    IB_SRES_4 :  in ib_sres_type := ib_sres_init  -- ib_sres input 4

  );

end component;

end package iblib;