Subversion Repositories gpib_controller

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

--This file is part of fpga_gpib_controller.

--

-- Fpga_gpib_controller 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 3 of the License, or

-- (at your option) any later version.

--

-- Fpga_gpib_controller 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 Fpga_gpib_controller.  If not, see <http://www.gnu.org/licenses/>.

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

-- Entity:      gpibInterface

-- Date:        13:34 15/10/2011

-- Author: Andrzej Paluch

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

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use work.gpibComponents.all;

entity gpibInterface is

        port (

                clk : in std_logic;

                reset : std_logic;

                -- application interface

                isLE : in std_logic;

                isTE : in std_logic;

                lpeUsed : in std_logic;

                fixedPpLine : in std_logic_vector (2 downto 0);

                eosUsed : in std_logic;

                eosMark : in std_logic_vector (7 downto 0);

                myListAddr : in std_logic_vector (4 downto 0);

                myTalkAddr : in std_logic_vector (4 downto 0);

                secAddrMask : in std_logic_vector (31 downto 0);

                data : in std_logic_vector (7 downto 0);

                status_byte : in std_logic_vector (7 downto 0);

                T1 : in std_logic_vector (7 downto 0);

                -- local commands to interface

                rdy : in std_logic; -- ready for next message (AH)

                nba : in std_logic; -- new byte available (SH)

                ltn : in std_logic; -- listen (L, LE)

                lun : in std_logic; -- local unlisten (L, LE)

                lon : in std_logic; -- listen only (L, LE)

                ton : in std_logic; -- talk only (T, TE)

                endOf : in std_logic; -- end of byte string (T, TE)

                gts : in std_logic; -- go to standby (C)

                rpp : in std_logic; -- request parallel poll (C)

                tcs : in std_logic; -- take control synchronously (C, AH)

                tca : in std_logic; -- take control asynchronously (C)

                sic : in std_logic; -- send interface clear (C)

                rsc : in std_logic; -- request system control (C)

                sre : in std_logic; -- send remote enable (C)

                rtl : in std_logic; -- return to local (RL)

                rsv : in std_logic; -- request service (SR)

                ist : in std_logic; -- individual status (PP)

                lpe : in std_logic; -- local poll enable (PP)

                -- local commands from interface

                dvd : out std_logic; -- data valid (AH)

                wnc : out std_logic; -- wait for new cycle (SH)

                tac : out std_logic; -- talker active (T, TE)

                lac : out std_logic; -- listener active (L, LE)

                cwrc : out std_logic; -- controller write commands

                cwrd : out std_logic; -- controller write data

                clr : out std_logic; -- clear device (DC)

                trg : out std_logic; -- trigger device (DT)

                atl : out std_logic; -- addressed to listen (T or TE)

                att : out std_logic; -- addressed to talk(L or LE)

                mla : out std_logic; -- my listen addres decoded (L or LE)

                lsb : out std_logic; -- last byte

                spa : out std_logic; -- seriall poll active

                ppr : out std_logic; -- parallel poll ready

                sreq : out std_logic; -- service requested

                isLocal : out std_logic; -- device is local controlled

                currentSecAddr : out std_logic_vector (4 downto 0); -- current sec addr

                -- interface signals

                DI : in std_logic_vector (7 downto 0);

                DO : out std_logic_vector (7 downto 0);

                output_valid : out std_logic;

                -- attention

                ATN_in : in std_logic;

                ATN_out : out std_logic;

                -- data valid

                DAV_in : in std_logic;

                DAV_out : out std_logic;

                -- not ready for data

                NRFD_in : in std_logic;

                NRFD_out : out std_logic;

                -- no data accepted

                NDAC_in : in std_logic;

                NDAC_out : out std_logic;

                -- end or identify

                EOI_in : in std_logic;

                EOI_out : out std_logic;

                -- service request

                SRQ_in : in std_logic;

                SRQ_out : out std_logic;

                -- interface clear

                IFC_in : in std_logic;

                IFC_out : out std_logic;

                -- remote enable

                REN_in : in std_logic;

                REN_out : out std_logic

                ;debug1 : out std_logic

        );

end gpibInterface;

architecture Behavioral of gpibInterface is

        -- function states

        signal LACS, LADS, SPAS, TACS, CACS, CSBS, CPPS, CTRS, CSRS, SACS, ACDS,

                TPAS, APRS, LPAS, TADS, ANRS, STRS, SDYS, PPAS, LOCS, LWLS : std_logic;

        -- decoded remote commands

        signal ATN_dec, DAC_dec, DAV_dec, END_c_dec, IDY_dec, IFC_dec, REN_dec,

                RFD_dec, SRQ_dec : std_logic;

        signal ACG_dec, DAB_dec, DCL_dec, EOS_dec, GET_dec, GTL_dec, LAG_dec,

                LLO_dec, MLA_dec, MTA_dec, MSA_dec, NUL_dec, OSA_dec, OTA_dec, PCG_dec,

                PPC_dec, PPE_dec, PPD_dec, PPR_dec, PPU_dec, RQS_dec, SCG_dec, SDC_dec,

                SPD_dec, SPE_dec, STB_dec, TAG_dec, TCT_dec, UCG_dec, UNL_dec,

                UNT_dec : std_logic;

        -- encoded remote commands

        signal ATN_enc, DAC_enc, RFD_enc, DAV_enc, END_OF_enc, IFC_enc, IDY_enc,

                REN_enc, RQS_enc, DAB_enc, EOS_enc, STB_enc, TCT_enc, SRQ_enc,

                PPR_enc : std_logic;

        -- PPR command data

        signal ppBitValue : std_logic;

        signal ppLineNumber : std_logic_vector (2 downto 0);

        -- internal signals

        signal secAddrDetected : std_logic;

begin

        dvd <= ACDS;

        cwrc <= CACS;

        cwrd <= CSBS;

        atl <= LADS or LACS;

        lac <= LACS;

        att <= TACS or TADS or SPAS;

        mla <= MLA_dec;

        lsb <= ((eosUsed and EOS_dec) or END_c_dec) and ACDS; -- dvd = ACDS

        spa <= SPAS;

        ppr <= CPPS;

        sreq <= CSRS and SACS;

        isLocal <= LOCS or LWLS;

        -- acceptor handshake

        AH: if_func_AH port map(

                clk => clk,

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

                pon => reset, rdy => rdy, tcs => tcs,

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

                LACS => LACS, LADS => LADS,

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

                ATN => ATN_dec, DAV => DAV_dec,

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

                RFD => RFD_enc, DAC=> DAC_enc,

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

                ANRS => ANRS, ACDS => ACDS

        );

        -- source handshake

        SH: if_func_SH port map(

                clk => clk,

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

                T1 => T1,

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

                pon => reset, nba => nba,

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

                TACS => TACS, SPAS => SPAS, CACS => CACS, CTRS => CTRS,

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

                ATN => ATN_dec, DAC => DAC_dec, RFD => RFD_dec,

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

                DAV => DAV_enc,

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

                wnc => wnc,

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

                STRS => STRS, SDYS => SDYS

        );

        -- listener, extended listener

        L_LE: if_func_L_LE port map(

                clk => clk,

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

                isLE => isLE,

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

                pon => reset, ltn => ltn, lun => lun, lon => lon,

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

                ACDS => ACDS, CACS => CACS, TPAS => TPAS,

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

                ATN => ATN_dec, IFC => IFC_dec, MLA => MLA_dec, MTA => MTA_dec,

                UNL => UNL_dec, PCG => PCG_dec, MSA => MSA_dec,

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

                LACS => LACS, LADS => LADS, LPAS => LPAS, debug1 => debug1

        );

        -- talker, extended talker

        T_TE: if_func_T_TE port map(

                clk => clk,

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

                isTE => isTE,

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

                pon => reset, ton => ton, endOf => endOf,

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

                ACDS => ACDS, APRS => APRS, LPAS => LPAS,

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

                ATN => ATN_dec, IFC => IFC_dec, SPE => SPE_dec, SPD => SPD_dec,

                MTA => MTA_dec, OTA => OTA_dec, MLA => MLA_dec, OSA => OSA_dec,

                MSA => MSA_dec, PCG => PCG_dec,

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

                END_OF => END_OF_enc, RQS => RQS_enc, DAB => DAB_enc, EOS => EOS_enc,

                STB => STB_enc,

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

                tac => tac,

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

                SPAS => SPAS, TPAS => TPAS, TADS => TADS, TACS => TACS

        );

        -- controller

        C: if_func_C  port map(

                clk => clk,

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

                pon => reset, gts => gts, rpp => rpp, tcs => tcs, tca => tca,

                sic => sic, rsc => rsc, sre => sre,

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

                TADS => TADS, ACDS => ACDS, ANRS => ANRS, STRS => STRS, SDYS => SDYS,

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

                ATN_in => ATN_dec, IFC_in => IFC_dec, TCT_in => TCT_dec,

                SRQ_in => SRQ_dec,

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

                ATN_out => ATN_enc, IFC_out => IFC_enc, TCT_out => TCT_enc,

                IDY_out => IDY_enc, REN_out => REN_enc,

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

                CACS => CACS, CTRS => CTRS, CSBS => CSBS, CPPS => CPPS, CSRS => CSRS,

                SACS => SACS

        );

        -- device clear

        DC: if_func_DC port map(

                clk => clk,

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

                LADS => LADS, ACDS => ACDS,

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

                DCL => DCL_dec, SDC => SDC_dec,

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

                clr => clr

        );

        -- device trigger

        DT: if_func_DT port map(

                clk => clk,

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

                LADS => LADS, ACDS => ACDS,

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

                GET => GET_dec,

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

                trg => trg

        );

        PP: if_func_PP port map(

                clk => clk,

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

                lpeUsed => lpeUsed, fixedPpLine => fixedPpLine,

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

                pon => reset, lpe => lpe, ist => ist,

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

                ACDS => ACDS, LADS => LADS,

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

                dio_data => DI(3 downto 0),

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

                IDY => IDY_dec, PPE => PPE_dec, PPD => PPD_dec, PPC => PPC_dec,

                PPU => PPU_dec, PCG => PCG_dec,

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

                PPR => PPR_enc, ppBitValue => ppBitValue, ppLineNumber => ppLineNumber,

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

                PPAS => PPAS

        );

        RL: if_func_RL port map(

                clk => clk,

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

                pon => reset, rtl => rtl,

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

                ACDS => ACDS, LADS => LADS,

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

                REN => REN_dec, LLO => LLO_dec, MLA => MLA_dec, GTL => GTL_dec,

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

                LOCS => LOCS, LWLS => LWLS

        );

        SR: if_func_SR port map(

                clk => clk,

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

                pon => reset, rsv => rsv,

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

                SPAS => SPAS,

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

                SRQ => SRQ_enc,

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

                APRS => APRS

        );

        COMM_ENC: commandEcoder port map (

                        data => data, status_byte => status_byte,

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

                        ppBitValue => ppBitValue, ppLineNumber => ppLineNumber,

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

                        APRS => APRS, CACS => CACS,

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

                        ATN => ATN_enc, END_OF => END_OF_enc, IDY => IDY_enc,

                        DAC => DAC_enc, RFD => RFD_enc, DAV => DAV_enc, IFC => IFC_enc,

                        REN => REN_enc, SRQ => SRQ_enc, DAB => DAB_enc, EOS => EOS_enc,

                        RQS => RQS_enc, STB => STB_enc, TCT => TCT_enc, PPR => PPR_enc,

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

                        DO => DO, output_valid => output_valid,

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

                        DAV_line => DAV_out, NRFD_line => NRFD_out, NDAC_line => NDAC_out,

                        ATN_line => ATN_out, EOI_line => EOI_out, SRQ_line => SRQ_out,

                        IFC_line => IFC_out, REN_line => REN_out

        );

        -- command decoder

        COMM_DEC: commandDecoder port map (

                DI => DI, DAV_line => DAV_in, NRFD_line => NRFD_in,

                NDAC_line => NDAC_in, ATN_line => ATN_in, EOI_line => EOI_in,

                SRQ_line => SRQ_in, IFC_line => IFC_in, REN_line => REN_in,

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

                eosMark => eosMark, eosUsed =>eosUsed, myListAddr => myListAddr,

                myTalkAddr => myTalkAddr, secAddrDetected => secAddrDetected,

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

                SPAS => SPAS,

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

                ATN => ATN_dec, DAC => DAC_dec, DAV => DAV_dec, END_c => END_c_dec,

                IDY => IDY_dec, IFC => IFC_dec, REN => REN_dec, RFD => RFD_dec,

                SRQ => SRQ_dec,

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

                ACG => ACG_dec, DAB => DAB_dec, DCL => DCL_dec, EOS => EOS_dec,

                GET => GET_dec, GTL => GTL_dec, LAG => LAG_dec, LLO => LLO_dec,

                MLA => MLA_dec, MTA => MTA_dec, MSA => MSA_dec, NUL => NUL_dec,

                OSA => OSA_dec, OTA => OTA_dec, PCG => PCG_dec, PPC => PPC_dec,

                PPE => PPE_dec, PPD => PPD_dec, PPR => PPR_dec, PPU => PPU_dec,

                RQS => RQS_dec, SCG => SCG_dec, SDC => SDC_dec, SPD => SPD_dec,

                SPE => SPE_dec, STB => STB_dec, TAG => TAG_dec, TCT => TCT_dec,

                UCG => UCG_dec, UNL => UNL_dec, UNT => UNT_dec

        );

        SECAD: SecondaryAddressDecoder port map (

                secAddrMask => secAddrMask, DI => DI(4 downto 0),

                secAddrDetected => secAddrDetected

        );

        SECADS: SecAddrSaver port map (

                reset => reset,

                TADS => TADS, TPAS => TPAS, LADS => LADS, LPAS => LPAS,

                MSA_Dec => MSA_Dec, DI => DI(4 downto 0),

                currentSecAddr => currentSecAddr

        );

end Behavioral;