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-- $Id: rlinklib.vhd 442 2011-12-23 10:03:28Z mueller $

--

-- Copyright 2007-2011 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.

--

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

-- Package Name:   rlinklib

-- Description:    Definitions for rlink interface and bus entities

--

-- Dependencies:   -

-- Tool versions:  xst 8.2, 9.1, 9.2, 11.4, 12.1, 13.1; ghdl 0.18-0.29

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2011-12-21   442   3.2.1  retire old, deprecated interfaces

-- 2011-12-09   437   3.2    add rlink_core8

-- 2011-11-18   427   3.1.3  now numeric_std clean

-- 2010-12-25   348   3.1.2  drop RL_FLUSH support, add RL_MONI for rlink_core;

--                           new rlink_serport interface;

--                           rename rlink_core_serport->rlink_base_serport

-- 2010-12-24   347   3.1.1  rename: CP_*->RL->*

-- 2010-12-22   346   3.1    rename: [cd]crc->[cd]err, ioto->rbnak, ioerr->rberr

-- 2010-12-04   343   3.0    move rbus components to rbus/rblib; renames

--                           rri_ -> rlink and c_rri -> c_rlink;

-- 2010-06-18   306   2.5.1  rename rbus data fields to _rbf_

-- 2010-06-06   302   2.5    use sop/eop framing instead of soc+chaining

-- 2010-06-03   300   2.1.5  use FAWIDTH=5 for rri_serport

-- 2010-05-02   287   2.1.4  ren CE_XSEC->CE_INT,RP_STAT->RB_STAT,AP_LAM->RB_LAM

--                           drop RP_IINT from interfaces; drop RTSFLUSH generic

-- 2010-05-01   285   2.1.3  remove rri_rb_rpcompat, now obsolete

-- 2010-04-18   279   2.1.2  rri_core_serport: drop RTSFBUF generic

-- 2010-04-10   275   2.1.1  add rri_core_serport

-- 2010-04-03   274   2.1    add CP_FLUSH for rri_core, rri_serport;

--                           CE_USEC, RTSFLUSH, CTS_N, RTS_N  for rri_serport

-- 2008-08-24   162   2.0    all with new rb_mreq/rb_sres interface

-- 2008-08-22   161   1.3    renamed rri_rbres_ -> rb_sres_; drop rri_[24]rp

-- 2008-02-16   116   1.2.1  added rri_wreg(rw|w|r)_3

-- 2008-01-20   113   1.2    added rb_[mreq|sres]; _rbres_or_*; _rb_rpcompat

-- 2007-11-24    98   1.1    added RP_IINT for rri_core.

-- 2007-09-09    81   1.0    Initial version 

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

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.slvtypes.all;

use work.rblib.all;

use work.serport.all;

package rlinklib is

constant c_rlink_cpref : slv4 := "1000";  -- default comma prefix

constant c_rlink_ncomm : positive := 4;   -- number commas (sop,eop,nak,attn)

constant c_rlink_dat_idle : slv9 := "100000000";

constant c_rlink_dat_sop  : slv9 := "100000001";

constant c_rlink_dat_eop  : slv9 := "100000010";

constant c_rlink_dat_nak  : slv9 := "100000011";

constant c_rlink_dat_attn : slv9 := "100000100";

constant c_rlink_cmd_rreg : slv3 := "000";

constant c_rlink_cmd_rblk : slv3 := "001";

constant c_rlink_cmd_wreg : slv3 := "010";

constant c_rlink_cmd_wblk : slv3 := "011";

constant c_rlink_cmd_stat : slv3 := "100";

constant c_rlink_cmd_attn : slv3 := "101";

constant c_rlink_cmd_init : slv3 := "110";

constant c_rlink_iint_rbf_anena:    integer := 15;         -- anena flag

constant c_rlink_iint_rbf_itoena:   integer := 14;         -- itoena flag

subtype  c_rlink_iint_rbf_itoval is integer range 7 downto 0; -- command code

subtype  c_rlink_cmd_rbf_seq is  integer range 7 downto 3; -- sequence number

subtype  c_rlink_cmd_rbf_code is integer range 2 downto 0; -- command code

subtype  c_rlink_stat_rbf_stat is integer range 7 downto 5;  -- ext status bits

constant c_rlink_stat_rbf_attn:   integer := 4;  -- attention flags set

constant c_rlink_stat_rbf_cerr:   integer := 3;  -- command error

constant c_rlink_stat_rbf_derr:   integer := 2;  -- data error

constant c_rlink_stat_rbf_rbnak:  integer := 1;  -- rbus no ack or timeout

constant c_rlink_stat_rbf_rberr:  integer := 0;  -- rbus err bit set

type rl_moni_type is record             -- rlink_core monitor port

  eop  : slbit;                         -- eop send in last cycle

  attn : slbit;                         -- attn send in last cycle

  lamp : slbit;                         -- attn (lam) pending

end record rl_moni_type;

constant rl_moni_init : rl_moni_type :=

  ('0','0','0');                        -- eop,attn,lamp

-- ise 13.1 xst can bug check if generic defaults in a package are defined via 

-- 'slv(to_unsigned())'. The conv_ construct prior to numeric_std was ok.

-- As workaround the ibus default addresses are defined here as constant.

constant rbaddr_rlink_serport : slv8 := slv(to_unsigned(2#11111110#,8));

-- this definition logically belongs into the 'for test benches' section'

-- must be here because it is needed as generic default in rlink_core8

-- simbus sb_cntl field usage for rlink

constant sbcntl_sbf_rlmon : integer := 15;

component rlink_core is                 -- rlink core with 9bit iface

  generic (

    ATOWIDTH : positive :=  5;          -- access timeout counter width

    ITOWIDTH : positive :=  6);         -- idle timeout counter width

  port (

    CLK  : in slbit;                    -- clock

    CE_INT : in slbit := '0';           -- rlink ito time unit clock enable

    RESET  : in slbit;                  -- reset

    RL_DI : in slv9;                    -- rlink 9b: data in

    RL_ENA : in slbit;                  -- rlink 9b: data enable

    RL_BUSY : out slbit;                -- rlink 9b: data busy

    RL_DO : out slv9;                   -- rlink 9b: data out

    RL_VAL : out slbit;                 -- rlink 9b: data valid

    RL_HOLD : in slbit;                 -- rlink 9b: data hold

    RL_MONI : out rl_moni_type;         -- rlink: monitor port

    RB_MREQ : out rb_mreq_type;         -- rbus: request

    RB_SRES : in rb_sres_type;          -- rbus: response

    RB_LAM : in slv16;                  -- rbus: look at me

    RB_STAT : in slv3                   -- rbus: status flags

  );

end component;

component rlink_aif is                  -- rlink, abstract interface

  port (

    CLK  : in slbit;                    -- clock

    CE_INT : in slbit := '0';           -- rlink ito time unit clock enable

    RESET  : in slbit :='0';            -- reset

    RL_DI : in slv9;                    -- rlink 9b: data in

    RL_ENA : in slbit;                  -- rlink 9b: data enable

    RL_BUSY : out slbit;                -- rlink 9b: data busy

    RL_DO : out slv9;                   -- rlink 9b: data out

    RL_VAL : out slbit;                 -- rlink 9b: data valid

    RL_HOLD : in slbit := '0'           -- rlink 9b: data hold

  );

end component;

component rlink_core8 is                -- rlink core with 8bit iface

  generic (

    ATOWIDTH : positive :=  5;          -- access timeout counter width

    ITOWIDTH : positive :=  6;          -- idle timeout counter width

    CPREF : slv4 := c_rlink_cpref;      -- comma prefix

    ENAPIN_RLMON : integer := sbcntl_sbf_rlmon;  -- SB_CNTL for rlmon (-1=none)

    ENAPIN_RBMON : integer := sbcntl_sbf_rbmon); -- SB_CNTL for rbmon (-1=none)

  port (

    CLK  : in slbit;                    -- clock

    CE_INT : in slbit := '0';           -- rlink ito time unit clock enable

    RESET  : in slbit;                  -- reset

    RLB_DI : in slv8;                   -- rlink 8b: data in

    RLB_ENA : in slbit;                 -- rlink 8b: data enable

    RLB_BUSY : out slbit;               -- rlink 8b: data busy

    RLB_DO : out slv8;                  -- rlink 8b: data out

    RLB_VAL : out slbit;                -- rlink 8b: data valid

    RLB_HOLD : in slbit;                -- rlink 8b: data hold

    RL_MONI : out rl_moni_type;         -- rlink: monitor port

    RB_MREQ : out rb_mreq_type;         -- rbus: request

    RB_SRES : in rb_sres_type;          -- rbus: response

    RB_LAM : in slv16;                  -- rbus: look at me

    RB_STAT : in slv3                   -- rbus: status flags

  );

end component;

--

-- core + concrete_interface combo's

--

component rlink_sp1c is                 -- rlink_core8+serport_1clock combo

  generic (

    ATOWIDTH : positive :=  5;          -- access timeout counter width

    ITOWIDTH : positive :=  6;          -- idle timeout counter width

    CPREF : slv4 := c_rlink_cpref;      -- comma prefix

    IFAWIDTH : natural :=  5;           -- input fifo address width  (0=none)

    OFAWIDTH : natural :=  5;           -- output fifo address width (0=none)

    ENAPIN_RLMON : integer := sbcntl_sbf_rlmon;  -- SB_CNTL for rlmon (-1=none)

    ENAPIN_RBMON : integer := sbcntl_sbf_rbmon;  -- SB_CNTL for rbmon (-1=none)

    CDWIDTH : positive := 13;           -- clk divider width

    CDINIT : natural   := 15);          -- clk divider initial/reset setting

  port (

    CLK  : in slbit;                    -- clock

    CE_USEC : in slbit;                 -- 1 usec clock enable

    CE_MSEC : in slbit;                 -- 1 msec clock enable

    CE_INT : in slbit := '0';           -- rri ito time unit clock enable

    RESET  : in slbit;                  -- reset

    ENAXON : in slbit;                  -- enable xon/xoff handling

    ENAESC : in slbit;                  -- enable xon/xoff escaping

    RXSD : in slbit;                    -- receive serial data      (board view)

    TXSD : out slbit;                   -- transmit serial data     (board view)

    CTS_N : in slbit := '0';            -- clear to send   (act.low, board view)

    RTS_N : out slbit;                  -- request to send (act.low, board view)

    RB_MREQ : out rb_mreq_type;         -- rbus: request

    RB_SRES : in rb_sres_type;          -- rbus: response

    RB_LAM : in slv16;                  -- rbus: look at me

    RB_STAT : in slv3;                  -- rbus: status flags

    RL_MONI : out rl_moni_type;         -- rlink_core: monitor port

    SER_MONI : out serport_moni_type    -- serport: monitor port

  );

end component;

--

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

--

component rlink_mon is                  -- rlink monitor

  generic (

    DWIDTH : positive :=  9);           -- data port width (8 or 9)

  port (

    CLK  : in slbit;                    -- clock

    CLK_CYCLE : in slv31 := (others=>'0');  -- clock cycle number

    ENA  : in slbit := '1';             -- enable monitor output

    RL_DI : in slv(DWIDTH-1 downto 0);  -- rlink: data in

    RL_ENA : in slbit;                  -- rlink: data enable

    RL_BUSY : in slbit;                 -- rlink: data busy

    RL_DO : in slv(DWIDTH-1 downto 0);  -- rlink: data out

    RL_VAL : in slbit;                  -- rlink: data valid

    RL_HOLD : in slbit                  -- rlink: data hold

  );

end component;

component rlink_mon_sb is              -- simbus wrap for rlink monitor

  generic (

    DWIDTH : positive :=  9;            -- data port width (8 or 9)

    ENAPIN : integer := sbcntl_sbf_rlmon); -- SB_CNTL signal to use for enable

  port (

    CLK  : in slbit;                    -- clock

    RL_DI : in slv(DWIDTH-1 downto 0);  -- rlink: data in

    RL_ENA : in slbit;                  -- rlink: data enable

    RL_BUSY : in slbit;                 -- rlink: data busy

    RL_DO : in slv(DWIDTH-1 downto 0);  -- rlink: data out

    RL_VAL : in slbit;                  -- rlink: data valid

    RL_HOLD : in slbit                  -- rlink: data hold

  );

end component;

end package rlinklib;