--/**************************************************************************************************************
|
--/**************************************************************************************************************
|
--*
|
--*
|
--* L Z R W 1 E N C O D E R C O R E
|
--* L Z R W 1 E N C O D E R C O R E
|
--*
|
--*
|
--* A high throughput loss less data compression core.
|
--* A high throughput loss less data compression core.
|
--*
|
--*
|
--* Copyright 2012-2013 Lukas Schrittwieser (LS)
|
--* Copyright 2012-2013 Lukas Schrittwieser (LS)
|
--*
|
--*
|
--* This program is free software: you can redistribute it and/or modify
|
--* 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
|
--* it under the terms of the GNU General Public License as published by
|
--* the Free Software Foundation, either version 2 of the License, or
|
--* the Free Software Foundation, either version 2 of the License, or
|
--* (at your option) any later version.
|
--* (at your option) any later version.
|
--*
|
--*
|
--* This program is distributed in the hope that it will be useful,
|
--* This program is distributed in the hope that it will be useful,
|
--* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
--* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
--* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
--* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
--* GNU General Public License for more details.
|
--* GNU General Public License for more details.
|
--*
|
--*
|
--* You should have received a copy of the GNU General Public License
|
--* You should have received a copy of the GNU General Public License
|
--* along with this program; if not, write to the Free Software
|
--* along with this program; if not, write to the Free Software
|
--* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
--* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
--* Or see <http://www.gnu.org/licenses/>
|
--* Or see <http://www.gnu.org/licenses/>
|
--*
|
--*
|
--***************************************************************************************************************
|
--***************************************************************************************************************
|
--*
|
--*
|
--* Change Log:
|
--* Change Log:
|
--*
|
--*
|
--* Version 1.0 - 2012/6/17 - LS
|
--* Version 1.0 - 2012/6/17 - LS
|
--* started file
|
--* started file
|
--*
|
--*
|
--* Version 1.0 - 2013/04/05 - LS
|
--* Version 1.0 - 2013/04/05 - LS
|
--* release
|
--* release
|
--*
|
--*
|
--***************************************************************************************************************
|
--***************************************************************************************************************
|
--*
|
--*
|
--* Naming convention: http://dz.ee.ethz.ch/en/information/hdl-help/vhdl-naming-conventions.html
|
--* Naming convention: http://dz.ee.ethz.ch/en/information/hdl-help/vhdl-naming-conventions.html
|
--*
|
--*
|
--***************************************************************************************************************
|
--***************************************************************************************************************
|
--*
|
--*
|
--* This is the main file of the compression core. It connects several
|
--* This is the main file of the compression core. It connects several
|
--* sub-cores in a pipeline. Data IO is bytewise.
|
--* sub-cores in a pipeline. Data IO is bytewise.
|
--*
|
--*
|
--***************************************************************************************************************
|
--***************************************************************************************************************
|
library IEEE;
|
library IEEE;
|
use IEEE.STD_LOGIC_1164.all;
|
use IEEE.STD_LOGIC_1164.all;
|
use IEEE.NUMERIC_STD.all;
|
use IEEE.NUMERIC_STD.all;
|
|
|
library UNISIM;
|
library UNISIM;
|
use UNISIM.VComponents.all;
|
use UNISIM.VComponents.all;
|
|
|
entity LZRWcompressor is
|
entity LZRWcompressor is
|
port (
|
port (
|
ClkxCI : in std_logic;
|
ClkxCI : in std_logic;
|
RstxRI : in std_logic;
|
RstxRI : in std_logic;
|
DataInxDI : in std_logic_vector(7 downto 0); -- uncompressed data input
|
DataInxDI : in std_logic_vector(7 downto 0); -- uncompressed data input
|
StrobexSI : in std_logic; -- strobe for input data
|
StrobexSI : in std_logic; -- strobe for input data
|
FlushBufxSI : in std_logic;
|
FlushBufxSI : in std_logic;
|
BusyxSO : out std_logic; -- data can only be strobed in if this is low
|
BusyxSO : out std_logic; -- data can only be strobed in if this is low
|
DonexSO : out std_logic; -- flush is done, all data has been processed
|
DonexSO : out std_logic; -- flush is done, all data has been processed
|
BufOutxDO : out std_logic_vector(7 downto 0);
|
BufOutxDO : out std_logic_vector(7 downto 0);
|
OutputValidxSO : out std_logic;
|
OutputValidxSO : out std_logic;
|
RdStrobexSI : in std_logic;
|
RdStrobexSI : in std_logic;
|
LengthxDO : out integer range 0 to 1024
|
LengthxDO : out integer range 0 to 1024
|
);
|
);
|
end LZRWcompressor;
|
end LZRWcompressor;
|
|
|
architecture Behavioral of LZRWcompressor is
|
architecture Behavioral of LZRWcompressor is
|
|
|
|
|
component HashTable
|
component HashTable
|
generic (
|
generic (
|
entryBitWidth : integer);
|
entryBitWidth : integer);
|
port (
|
port (
|
ClkxCI : in std_logic;
|
ClkxCI : in std_logic;
|
RstxRI : in std_logic;
|
RstxRI : in std_logic;
|
NewEntryxDI : in std_logic_vector(entryBitWidth-1 downto 0);
|
NewEntryxDI : in std_logic_vector(entryBitWidth-1 downto 0);
|
EnWrxSI : in std_logic;
|
EnWrxSI : in std_logic;
|
Key0xDI : in std_logic_vector(7 downto 0);
|
Key0xDI : in std_logic_vector(7 downto 0);
|
Key1xDI : in std_logic_vector(7 downto 0);
|
Key1xDI : in std_logic_vector(7 downto 0);
|
Key2xDI : in std_logic_vector(7 downto 0);
|
Key2xDI : in std_logic_vector(7 downto 0);
|
OldEntryxDO : out std_logic_vector(entryBitWidth-1 downto 0));
|
OldEntryxDO : out std_logic_vector(entryBitWidth-1 downto 0));
|
end component;
|
end component;
|
|
|
component historyBuffer
|
component historyBuffer
|
port (
|
port (
|
ClkxCI : in std_logic;
|
ClkxCI : in std_logic;
|
RstxRI : in std_logic;
|
RstxRI : in std_logic;
|
WriteInxDI : in std_logic_vector(7 downto 0);
|
WriteInxDI : in std_logic_vector(7 downto 0);
|
WExSI : in std_logic;
|
WExSI : in std_logic;
|
NextWrAdrxDO : out std_logic_vector(11 downto 0);
|
NextWrAdrxDO : out std_logic_vector(11 downto 0);
|
RExSI : in std_logic;
|
RExSI : in std_logic;
|
ReadBackAdrxDI : in std_logic_vector(11 downto 2);
|
ReadBackAdrxDI : in std_logic_vector(11 downto 2);
|
ReadBackxDO : out std_logic_vector(16*8-1 downto 0);
|
ReadBackxDO : out std_logic_vector(16*8-1 downto 0);
|
ReadBackDonexSO : out std_logic);
|
ReadBackDonexSO : out std_logic);
|
end component;
|
end component;
|
|
|
component comparator
|
component comparator
|
port (
|
port (
|
LookAheadxDI : in std_logic_vector(16*8-1 downto 0);
|
LookAheadxDI : in std_logic_vector(16*8-1 downto 0);
|
LookAheadLenxDI : in integer range 0 to 16;
|
LookAheadLenxDI : in integer range 0 to 16;
|
CandidatexDI : in std_logic_vector(16*8-1 downto 0);
|
CandidatexDI : in std_logic_vector(16*8-1 downto 0);
|
CandidateLenxDI : in integer range 0 to 16;
|
CandidateLenxDI : in integer range 0 to 16;
|
MatchLenxDO : out integer range 0 to 16);
|
MatchLenxDO : out integer range 0 to 16);
|
end component;
|
end component;
|
|
|
component outputEncoder
|
component outputEncoder
|
generic (
|
generic (
|
frameSize : integer;
|
frameSize : integer;
|
minMatchLen : integer;
|
minMatchLen : integer;
|
maxMatchLen : integer);
|
maxMatchLen : integer);
|
port (
|
port (
|
ClkxCI : in std_logic;
|
ClkxCI : in std_logic;
|
RstxRI : in std_logic;
|
RstxRI : in std_logic;
|
OffsetxDI : in std_logic_vector(11 downto 0);
|
OffsetxDI : in std_logic_vector(11 downto 0);
|
MatchLengthxDI : in integer range 0 to maxMatchLen;
|
MatchLengthxDI : in integer range 0 to maxMatchLen;
|
EnxSI : in std_logic;
|
EnxSI : in std_logic;
|
EndOfDataxSI : in std_logic;
|
EndOfDataxSI : in std_logic;
|
LiteralxDI : in std_logic_vector(7 downto 0);
|
LiteralxDI : in std_logic_vector(7 downto 0);
|
BodyStrobexSO : out std_logic;
|
BodyStrobexSO : out std_logic;
|
BodyOutxDO : out std_logic_vector(7 downto 0);
|
BodyOutxDO : out std_logic_vector(7 downto 0);
|
HeaderStrobexSO : out std_logic;
|
HeaderStrobexSO : out std_logic;
|
HeaderOutxDO : out std_logic_vector(frameSize-1 downto 0);
|
HeaderOutxDO : out std_logic_vector(frameSize-1 downto 0);
|
DonexSO : out std_logic);
|
DonexSO : out std_logic);
|
end component;
|
end component;
|
|
|
component outputFIFO
|
component outputFIFO
|
generic (
|
generic (
|
frameSize : integer);
|
frameSize : integer);
|
port (
|
port (
|
ClkxCI : in std_logic;
|
ClkxCI : in std_logic;
|
RstxRI : in std_logic;
|
RstxRI : in std_logic;
|
BodyDataxDI : in std_logic_vector(7 downto 0);
|
BodyDataxDI : in std_logic_vector(7 downto 0);
|
BodyStrobexSI : in std_logic;
|
BodyStrobexSI : in std_logic;
|
HeaderDataxDI : in std_logic_vector(frameSize-1 downto 0);
|
HeaderDataxDI : in std_logic_vector(frameSize-1 downto 0);
|
HeaderStrobexSI : in std_logic;
|
HeaderStrobexSI : in std_logic;
|
BuffersEmptyxSO : out std_logic;
|
BuffersEmptyxSO : out std_logic;
|
BufOutxDO : out std_logic_vector(7 downto 0);
|
BufOutxDO : out std_logic_vector(7 downto 0);
|
OutputValidxSO : out std_logic;
|
OutputValidxSO : out std_logic;
|
RdStrobexSI : in std_logic;
|
RdStrobexSI : in std_logic;
|
LengthxDO : out integer range 0 to 1024);
|
LengthxDO : out integer range 0 to 1024);
|
end component;
|
end component;
|
|
|
constant HIST_BUF_LEN : integer := 4096; -- length of the history buffer in bytes (DO NOT CHANGE!!)
|
constant HIST_BUF_LEN : integer := 4096; -- length of the history buffer in bytes (DO NOT CHANGE!!)
|
constant LOOK_AHEAD_LEN : integer := 16; -- length of the look ahead buffer in bytes (DO NOT CHANGE!!)
|
constant LOOK_AHEAD_LEN : integer := 16; -- length of the look ahead buffer in bytes (DO NOT CHANGE!!)
|
constant OUT_FIFO_THR : integer := 1000; -- output length at which we set busy high. Should be at least one max frame size below 1024
|
constant OUT_FIFO_THR : integer := 1000; -- output length at which we set busy high. Should be at least one max frame size below 1024
|
|
|
type lookAheadBufType is array (LOOK_AHEAD_LEN-1 downto 0) of std_logic_vector(7 downto 0);
|
type lookAheadBufType is array (LOOK_AHEAD_LEN-1 downto 0) of std_logic_vector(7 downto 0);
|
type ctrlFSMType is (ST_FILL_LOOK_AHEAD, ST_RUN, ST_DRAIN_LOOK_AHEAD, ST_DONE);
|
type ctrlFSMType is (ST_FILL_LOOK_AHEAD, ST_RUN, ST_DRAIN_LOOK_AHEAD, ST_DONE);
|
|
|
signal LookAheadBufxDN, LookAheadBufxDP : lookAheadBufType := (others => (others => '0'));
|
signal LookAheadBufxDN, LookAheadBufxDP : lookAheadBufType := (others => (others => '0'));
|
signal LookAheadLenxDN, LookAheadLenxDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal LookAheadLenxDN, LookAheadLenxDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal ShiftLookAheadxSN, ShiftLookAheadxSP : std_logic := '0';
|
signal ShiftLookAheadxSN, ShiftLookAheadxSP : std_logic := '0';
|
signal Strobe0xSN, Strobe0xSP : std_logic := '0';
|
signal Strobe0xSN, Strobe0xSP : std_logic := '0';
|
signal HistBufLen0xDN, HistBufLen0xDP : integer range 0 to HIST_BUF_LEN := 0; -- count history buffer length at startup
|
signal HistBufLen0xDN, HistBufLen0xDP : integer range 0 to HIST_BUF_LEN := 0; -- count history buffer length at startup
|
signal HistBufOutxD : std_logic_vector(LOOK_AHEAD_LEN*8-1 downto 0);
|
signal HistBufOutxD : std_logic_vector(LOOK_AHEAD_LEN*8-1 downto 0);
|
signal EndOfData0xSN, EndOfData0xSP : std_logic := '0';
|
signal EndOfData0xSN, EndOfData0xSP : std_logic := '0';
|
signal DataIn0xDN, DataIn0xDP : std_logic_vector(7 downto 0) := x"00";
|
signal DataIn0xDN, DataIn0xDP : std_logic_vector(7 downto 0) := x"00";
|
signal WrHistBufxS : std_logic;
|
signal WrHistBufxS : std_logic;
|
signal LookAheadPtr0xD : std_logic_vector(11 downto 0);
|
signal LookAheadPtr0xD : std_logic_vector(11 downto 0);
|
signal NextWrAdrxD : std_logic_vector(11 downto 0);
|
signal NextWrAdrxD : std_logic_vector(11 downto 0);
|
signal BusyxSN, BusyxSP : std_logic := '0';
|
signal BusyxSN, BusyxSP : std_logic := '0';
|
signal StatexSN, StatexSP : ctrlFSMType := ST_FILL_LOOK_AHEAD;
|
signal StatexSN, StatexSP : ctrlFSMType := ST_FILL_LOOK_AHEAD;
|
|
|
signal HashTableEntryxD : std_logic_vector(11 downto 0); -- entry found by the hash table
|
signal HashTableEntryxD : std_logic_vector(11 downto 0); -- entry found by the hash table
|
signal LookAheadLen1xDN, LookAheadLen1xDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal LookAheadLen1xDN, LookAheadLen1xDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal Strobe1xSN, Strobe1xSP : std_logic := '0';
|
signal Strobe1xSN, Strobe1xSP : std_logic := '0';
|
signal HistBufLen1xDN, HistBufLen1xDP : integer range 0 to HIST_BUF_LEN := 0;
|
signal HistBufLen1xDN, HistBufLen1xDP : integer range 0 to HIST_BUF_LEN := 0;
|
signal EndOfData1xSN, EndOfData1xSP : std_logic := '0';
|
signal EndOfData1xSN, EndOfData1xSP : std_logic := '0';
|
signal LookAheadBuf1xDN, LookAheadBuf1xDP : lookAheadBufType := (others => (others => '0'));
|
signal LookAheadBuf1xDN, LookAheadBuf1xDP : lookAheadBufType := (others => (others => '0'));
|
signal WrAdr1xDN, WrAdr1xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal WrAdr1xDN, WrAdr1xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal LookAheadPtr1xDN, LookAheadPtr1xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal LookAheadPtr1xDN, LookAheadPtr1xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal CandAddr1xDN, CandAddr1xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal CandAddr1xDN, CandAddr1xDP : std_logic_vector(11 downto 0) := (others => '0');
|
|
|
signal LookAheadLen2xDN, LookAheadLen2xDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal LookAheadLen2xDN, LookAheadLen2xDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal LookAheadBuf2xDN, LookAheadBuf2xDP : lookAheadBufType := (others => (others => '0'));
|
signal LookAheadBuf2xDN, LookAheadBuf2xDP : lookAheadBufType := (others => (others => '0'));
|
signal Strobe2xSN, Strobe2xSP : std_logic := '0';
|
signal Strobe2xSN, Strobe2xSP : std_logic := '0';
|
signal HistBufLen2xDN, HistBufLen2xDP : integer range 0 to HIST_BUF_LEN := 0;
|
signal HistBufLen2xDN, HistBufLen2xDP : integer range 0 to HIST_BUF_LEN := 0;
|
signal Candidate2xDN, Candidate2xDP : std_logic_vector(LOOK_AHEAD_LEN*8-1 downto 0) := (others => '0');
|
signal Candidate2xDN, Candidate2xDP : std_logic_vector(LOOK_AHEAD_LEN*8-1 downto 0) := (others => '0');
|
signal NextWrAdr2xDN, NextWrAdr2xDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal NextWrAdr2xDN, NextWrAdr2xDP : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal CandAddr2xDN, CandAddr2xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal CandAddr2xDN, CandAddr2xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal CandLen2xD : integer range 0 to LOOK_AHEAD_LEN;
|
signal CandLen2xDN, CandLen2xDP : integer range 0 to LOOK_AHEAD_LEN;
|
signal EndOfData2xSN, EndOfData2xSP : std_logic := '0';
|
signal EndOfData2xSN, EndOfData2xSP : std_logic := '0';
|
signal OffsetIntxD : integer range -HIST_BUF_LEN to HIST_BUF_LEN;
|
signal OffsetIntxD : integer range -HIST_BUF_LEN to HIST_BUF_LEN;
|
signal OffsetxD : std_logic_vector(11 downto 0);
|
signal OffsetxD : std_logic_vector(11 downto 0);
|
signal HashTableEntry2xDN, HashTableEntry2xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal HashTableEntry2xDN, HashTableEntry2xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal MaxCandLenxD : integer range 0 to LOOK_AHEAD_LEN;
|
signal MaxCandLenxD : integer range 0 to LOOK_AHEAD_LEN;
|
|
|
signal MatchLenxD, MatchLenLimitedxD : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal MatchLenxD, MatchLenLimitedxD : integer range 0 to LOOK_AHEAD_LEN := 0;
|
signal LookAheadPtr2xDN, LookAheadPtr2xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal LookAheadPtr2xDN, LookAheadPtr2xDP : std_logic_vector(11 downto 0) := (others => '0');
|
signal CompLAIn3xD : std_logic_vector(LOOK_AHEAD_LEN*8-1 downto 0);
|
signal CompLAIn3xD : std_logic_vector(LOOK_AHEAD_LEN*8-1 downto 0);
|
signal HeaderStrobexS : std_logic;
|
signal HeaderStrobexS : std_logic;
|
signal HeaderDataxD : std_logic_vector(7 downto 0);
|
signal HeaderDataxD : std_logic_vector(7 downto 0);
|
signal BodyStrobexS : std_logic;
|
signal BodyStrobexS : std_logic;
|
signal BodyDataxD : std_logic_vector(7 downto 0);
|
signal BodyDataxD : std_logic_vector(7 downto 0);
|
signal FifoBuffersEmptyxS : std_logic;
|
signal FifoBuffersEmptyxS : std_logic;
|
signal OutFIFOLengthxD : integer range 0 to 1024;
|
signal OutFIFOLengthxD : integer range 0 to 1024;
|
signal EncDonexS : std_logic;
|
signal EncDonexS : std_logic;
|
signal Done3xSN, Done3xSP : std_logic := '0';
|
signal Done3xSN, Done3xSP : std_logic := '0';
|
|
|
begin
|
begin
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- Pipeline stage 0
|
-- Pipeline stage 0
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
-- control FSM for look ahead buffer
|
-- control FSM for look ahead buffer
|
process (DataIn0xDP, DataInxDI, FlushBufxSI, LookAheadLenxDP,
|
process (DataIn0xDP, DataInxDI, FlushBufxSI, LookAheadLenxDP,
|
OutFIFOLengthxD, StatexSP, Strobe0xSP, StrobexSI)
|
OutFIFOLengthxD, StatexSP, Strobe0xSP, StrobexSI)
|
begin
|
begin
|
StatexSN <= StatexSP;
|
StatexSN <= StatexSP;
|
ShiftLookAheadxSN <= '0';
|
ShiftLookAheadxSN <= '0';
|
WrHistBufxS <= '0';
|
WrHistBufxS <= '0';
|
Strobe0xSN <= '0';
|
Strobe0xSN <= '0';
|
EndOfData0xSN <= '0';
|
EndOfData0xSN <= '0';
|
DataIn0xDN <= DataIn0xDP;
|
DataIn0xDN <= DataIn0xDP;
|
BusyxSN <= '0';
|
BusyxSN <= '0';
|
|
|
case StatexSP is
|
case StatexSP is
|
when ST_FILL_LOOK_AHEAD =>
|
when ST_FILL_LOOK_AHEAD =>
|
-- don't shift here, we are still loading data
|
-- don't shift here, we are still loading data
|
--ShiftLookAheadxSN <= StrobexSI; -- the shift is delayed by one cycle because we have to process the byte first
|
--ShiftLookAheadxSN <= StrobexSI; -- the shift is delayed by one cycle because we have to process the byte first
|
WrHistBufxS <= StrobexSI;
|
WrHistBufxS <= StrobexSI;
|
DataIn0xDN <= DataInxDI;
|
DataIn0xDN <= DataInxDI;
|
if FlushBufxSI='1' then
|
if FlushBufxSI = '1' then
|
StatexSN <= ST_DRAIN_LOOK_AHEAD;
|
StatexSN <= ST_DRAIN_LOOK_AHEAD;
|
elsif LookAheadLenxDP = LOOK_AHEAD_LEN-1 then
|
elsif LookAheadLenxDP = LOOK_AHEAD_LEN-1 then
|
-- this byte is number look_ahead_len-1, so it is the last one before the buffer is full
|
-- this byte is number look_ahead_len-1, so it is the last one before the buffer is full
|
-- the buffer will be full with the next incoming byte, so the next
|
-- the buffer will be full with the next incoming byte, so the next
|
-- one can be processed regularely
|
-- one can be processed regularely
|
StatexSN <= ST_RUN;
|
StatexSN <= ST_RUN;
|
end if;
|
end if;
|
|
|
when ST_RUN =>
|
when ST_RUN =>
|
ShiftLookAheadxSN <= StrobexSI;
|
ShiftLookAheadxSN <= StrobexSI;
|
Strobe0xSN <= StrobexSI; -- pass on strobe to pipeline
|
Strobe0xSN <= StrobexSI; -- pass on strobe to pipeline
|
WrHistBufxS <= StrobexSI;
|
WrHistBufxS <= StrobexSI;
|
DataIn0xDN <= DataInxDI;
|
DataIn0xDN <= DataInxDI;
|
if FlushBufxSI = '1' then
|
if FlushBufxSI = '1' then
|
StatexSN <= ST_DRAIN_LOOK_AHEAD;
|
StatexSN <= ST_DRAIN_LOOK_AHEAD;
|
end if;
|
end if;
|
|
|
when ST_DRAIN_LOOK_AHEAD =>
|
when ST_DRAIN_LOOK_AHEAD =>
|
-- create a strobe every second cycle
|
-- create a strobe every second cycle
|
if LookAheadLenxDP > 0 and Strobe0xSP = '0' then
|
if LookAheadLenxDP > 0 and Strobe0xSP = '0' then
|
ShiftLookAheadxSN <= '1';
|
ShiftLookAheadxSN <= '1';
|
Strobe0xSN <= '1';
|
Strobe0xSN <= '1';
|
end if;
|
end if;
|
if LookAheadLenxDP = 0 then
|
if LookAheadLenxDP = 0 then
|
EndOfData0xSN <= '1';
|
EndOfData0xSN <= '1';
|
StatexSN <= ST_DONE;
|
StatexSN <= ST_DONE;
|
end if;
|
end if;
|
|
|
when ST_DONE => null;
|
when ST_DONE => null;
|
|
|
when others => StatexSN <= ST_DONE; -- fail save, just block
|
when others => StatexSN <= ST_DONE; -- fail save, just block
|
end case;
|
end case;
|
|
|
if OutFIFOLengthxD > OUT_FIFO_THR then
|
if OutFIFOLengthxD > OUT_FIFO_THR then
|
BusyxSN <= '1'; -- request stop of data input if output FIFO is full
|
BusyxSN <= '1'; -- request stop of data input if output FIFO is full
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
-- we can accept data only every second clock cycle -> feed strobe back as
|
-- we can accept data only every second clock cycle -> feed strobe back as
|
-- busy signal
|
-- busy signal
|
BusyxSO <= BusyxSP or StrobexSI;
|
BusyxSO <= BusyxSP or StrobexSI;
|
|
|
-- implement a shift register for the look ahead buffer
|
-- implement a shift register for the look ahead buffer
|
lookAheadProc : process (DataInxDI, ShiftLookAheadxSP, StatexSP, StrobexSI,
|
lookAheadProc : process (DataInxDI, ShiftLookAheadxSP, StatexSP, StrobexSI,
|
lookAheadBufxDP, lookAheadLenxDP)
|
lookAheadBufxDP, lookAheadLenxDP)
|
begin -- process lookAheadProc
|
begin -- process lookAheadProc
|
lookAheadLenxDN <= lookAheadLenxDP;
|
lookAheadLenxDN <= lookAheadLenxDP;
|
|
|
if StrobexSI = '1' then
|
if StrobexSI = '1' then
|
-- load new data into MSB
|
-- load new data into MSB
|
--lookAheadBufxDN(LOOK_AHEAD_LEN-1) <= DataInxDI;
|
--lookAheadBufxDN(LOOK_AHEAD_LEN-1) <= DataInxDI;
|
-- increase length counter if it is below the top
|
-- increase length counter if it is below the top
|
if lookAheadLenxDP < LOOK_AHEAD_LEN then
|
if lookAheadLenxDP < LOOK_AHEAD_LEN then
|
lookAheadLenxDN <= lookAheadLenxDP + 1;
|
lookAheadLenxDN <= lookAheadLenxDP + 1;
|
end if;
|
end if;
|
end if;
|
end if;
|
|
|
if ShiftLookAheadxSP = '1' then
|
if ShiftLookAheadxSP = '1' then
|
-- decrease buffer length counter if there is no valid input data
|
-- decrease buffer length counter if there is no valid input data
|
if lookAheadLenxDP > 0 and StrobexSI = '0' and StatexSP /= ST_FILL_LOOK_AHEAD then
|
if lookAheadLenxDP > 0 and StrobexSI = '0' and StatexSP /= ST_FILL_LOOK_AHEAD then
|
lookAheadLenxDN <= lookAheadLenxDP - 1;
|
lookAheadLenxDN <= lookAheadLenxDP - 1;
|
end if;
|
end if;
|
end if;
|
end if;
|
|
|
end process lookAheadProc;
|
end process lookAheadProc;
|
|
|
-- implement actual shift register
|
-- implement actual shift register
|
lookAheadShiftReg : for i in 0 to LOOK_AHEAD_LEN-2 generate
|
lookAheadShiftReg : for i in 0 to LOOK_AHEAD_LEN-2 generate
|
process (DataInxDI, LookAheadLenxDP, ShiftLookAheadxSP, StrobexSI,
|
process (DataInxDI, LookAheadLenxDP, ShiftLookAheadxSP, StrobexSI,
|
lookAheadBufxDP)
|
lookAheadBufxDP)
|
begin -- process
|
begin -- process
|
lookAheadBufxDN(i) <= lookAheadBufxDP(i); -- default: do nothing
|
lookAheadBufxDN(i) <= lookAheadBufxDP(i); -- default: do nothing
|
if ShiftLookAheadxSP = '1' then
|
if ShiftLookAheadxSP = '1' then
|
lookAheadBufxDN(i) <= lookAheadBufxDP(i+1); -- shift done one entry
|
lookAheadBufxDN(i) <= lookAheadBufxDP(i+1); -- shift done one entry
|
elsif LookAheadLenxDP = i and StrobexSI = '1' then
|
elsif LookAheadLenxDP = i and StrobexSI = '1' then
|
lookAheadBufxDN(i) <= DataInxDI; -- load new byte into shift register
|
lookAheadBufxDN(i) <= DataInxDI; -- load new byte into shift register
|
end if;
|
end if;
|
end process;
|
end process;
|
end generate lookAheadShiftReg;
|
end generate lookAheadShiftReg;
|
-- implement the top most byte of the shift register
|
-- implement the top most byte of the shift register
|
lookAheadBufxDN(LOOK_AHEAD_LEN-1) <= DataInxDI when lookAheadLenxDP >= LOOK_AHEAD_LEN-1 and StrobexSI = '1' else lookAheadBufxDP(LOOK_AHEAD_LEN-1);
|
lookAheadBufxDN(LOOK_AHEAD_LEN-1) <= DataInxDI when lookAheadLenxDP >= LOOK_AHEAD_LEN-1 and StrobexSI = '1' else lookAheadBufxDP(LOOK_AHEAD_LEN-1);
|
|
|
HashTableInst : HashTable
|
HashTableInst : HashTable
|
generic map (
|
generic map (
|
entryBitWidth => 12)
|
entryBitWidth => 12)
|
port map (
|
port map (
|
ClkxCI => ClkxCI,
|
ClkxCI => ClkxCI,
|
RstxRI => RstxRI,
|
RstxRI => RstxRI,
|
NewEntryxDI => LookAheadPtr0xD,
|
NewEntryxDI => LookAheadPtr0xD,
|
EnWrxSI => Strobe0xSP, -- delay write by one cycle because we have to read first
|
EnWrxSI => Strobe0xSP, -- delay write by one cycle because we have to read first
|
Key0xDI => lookAheadBufxDP(0),
|
Key0xDI => lookAheadBufxDP(0),
|
Key1xDI => lookAheadBufxDP(1),
|
Key1xDI => lookAheadBufxDP(1),
|
Key2xDI => lookAheadBufxDP(2),
|
Key2xDI => lookAheadBufxDP(2),
|
OldEntryxDO => HashTableEntryxD);
|
OldEntryxDO => HashTableEntryxD);
|
|
|
historyBufferInst : historyBuffer
|
historyBufferInst : historyBuffer
|
port map (
|
port map (
|
ClkxCI => ClkxCI,
|
ClkxCI => ClkxCI,
|
RstxRI => RstxRI,
|
RstxRI => RstxRI,
|
WriteInxDI => DataInxDI,
|
WriteInxDI => DataInxDI,
|
WExSI => WrHistBufxS,
|
WExSI => WrHistBufxS,
|
NextWrAdrxDO => NextWrAdrxD,
|
NextWrAdrxDO => NextWrAdrxD,
|
RExSI => Strobe0xSP, -- delay read by one cycle (we write first)
|
RExSI => Strobe0xSP, -- delay read by one cycle (we write first)
|
ReadBackAdrxDI => HashTableEntryxD(11 downto 2),
|
ReadBackAdrxDI => HashTableEntryxD(11 downto 2),
|
ReadBackxDO => HistBufOutxD,
|
ReadBackxDO => HistBufOutxD,
|
ReadBackDonexSO => open);
|
ReadBackDonexSO => open);
|
|
|
-- calculate a pointer to the beginning of the look ahead section in the
|
-- calculate a pointer to the beginning of the look ahead section in the
|
-- history buffer
|
-- history buffer
|
process (LookAheadLenxDP, NextWrAdrxD)
|
process (LookAheadLenxDP, NextWrAdrxD)
|
begin -- process
|
begin -- process
|
if LookAheadLenxDP <= to_integer(unsigned(NextWrAdrxD)) then
|
if LookAheadLenxDP <= to_integer(unsigned(NextWrAdrxD)) then
|
-- this is the regular case, write index is bigger than look ahead len ->
|
-- this is the regular case, write index is bigger than look ahead len ->
|
-- no wrap around in buffer
|
-- no wrap around in buffer
|
LookAheadPtr0xD <= std_logic_vector(to_unsigned(to_integer(unsigned(NextWrAdrxD))-LookAheadLenxDP, 12));
|
LookAheadPtr0xD <= std_logic_vector(to_unsigned(to_integer(unsigned(NextWrAdrxD))-LookAheadLenxDP, 12));
|
else
|
else
|
-- wrap around -> add history buffer length to get a pos value
|
-- wrap around -> add history buffer length to get a pos value
|
LookAheadPtr0xD <= std_logic_vector(to_unsigned(HIST_BUF_LEN + to_integer(unsigned(NextWrAdrxD)) - LookAheadLenxDP, 12));
|
LookAheadPtr0xD <= std_logic_vector(to_unsigned(HIST_BUF_LEN + to_integer(unsigned(NextWrAdrxD)) - LookAheadLenxDP, 12));
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
|
|
-- count the number of bytes in the history buffer. Note that we only count
|
-- count the number of bytes in the history buffer. Note that we only count
|
-- the _history_ so only bytes which have already been processed.
|
-- the _history_ so only bytes which have already been processed.
|
process (HistBufLen0xDP, Strobe0xSP)
|
process (HistBufLen0xDP, Strobe0xSP)
|
begin
|
begin
|
HistBufLen0xDN <= HistBufLen0xDP;
|
HistBufLen0xDN <= HistBufLen0xDP;
|
-- count the number of processed bytes
|
-- count the number of processed bytes
|
if Strobe0xSP = '1' then
|
if Strobe0xSP = '1' then
|
if HistBufLen0xDP < HIST_BUF_LEN - LOOK_AHEAD_LEN then
|
if HistBufLen0xDP < HIST_BUF_LEN - LOOK_AHEAD_LEN then
|
HistBufLen0xDN <= HistBufLen0xDP + 1;
|
HistBufLen0xDN <= HistBufLen0xDP + 1;
|
end if;
|
end if;
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- pipeline stage 1
|
-- pipeline stage 1
|
--
|
--
|
-- wait for data from histroy buffer
|
-- wait for data from histroy buffer
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
process (CandAddr1xDP, HashTableEntryxD, HistBufLen0xDP, HistBufLen1xDP,
|
process (CandAddr1xDP, HashTableEntryxD, HistBufLen0xDP, HistBufLen1xDP,
|
LookAheadBuf1xDP, LookAheadLen1xDP, LookAheadPtr0xD,
|
LookAheadBuf1xDP, LookAheadLen1xDP, LookAheadPtr0xD,
|
LookAheadPtr1xDP, Strobe0xSP, lookAheadBufxDP, lookAheadLenxDP)
|
LookAheadPtr1xDP, Strobe0xSP, lookAheadBufxDP, lookAheadLenxDP)
|
begin
|
begin
|
LookAheadLen1xDN <= LookAheadLen1xDP;
|
LookAheadLen1xDN <= LookAheadLen1xDP;
|
LookAheadBuf1xDN <= LookAheadBuf1xDP;
|
LookAheadBuf1xDN <= LookAheadBuf1xDP;
|
LookAheadPtr1xDN <= LookAheadPtr1xDP;
|
LookAheadPtr1xDN <= LookAheadPtr1xDP;
|
HistBufLen1xDN <= HistBufLen1xDP;
|
HistBufLen1xDN <= HistBufLen1xDP;
|
CandAddr1xDN <= CandAddr1xDP;
|
CandAddr1xDN <= CandAddr1xDP;
|
|
|
if Strobe0xSP = '1' then
|
if Strobe0xSP = '1' then
|
LookAheadLen1xDN <= lookAheadLenxDP;
|
LookAheadLen1xDN <= lookAheadLenxDP;
|
LookAheadBuf1xDN <= lookAheadBufxDP;
|
LookAheadBuf1xDN <= lookAheadBufxDP;
|
CandAddr1xDN <= HashTableEntryxD;
|
CandAddr1xDN <= HashTableEntryxD;
|
LookAheadPtr1xDN <= LookAheadPtr0xD;
|
LookAheadPtr1xDN <= LookAheadPtr0xD;
|
HistBufLen1xDN <= HistBufLen0xDP;
|
HistBufLen1xDN <= HistBufLen0xDP;
|
end if;
|
end if;
|
|
|
end process;
|
end process;
|
|
|
-- signals to be passed on
|
-- signals to be passed on
|
Strobe1xSN <= Strobe0xSP;
|
Strobe1xSN <= Strobe0xSP;
|
EndOfData1xSN <= EndOfData0xSP;
|
EndOfData1xSN <= EndOfData0xSP;
|
|
|
|
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- pipeline stage 2
|
-- pipeline stage 2
|
--
|
--
|
-- shift history buffer output
|
-- shift history buffer output
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
-- limit the max candidate length
|
-- limit the max candidate length
|
MaxCandLenxD <= LOOK_AHEAD_LEN;
|
MaxCandLenxD <= LOOK_AHEAD_LEN;
|
|
|
-- use a shifter to implement the last two bytes of the address
|
-- use a shifter to implement the last two bytes of the address
|
process (CandAddr1xDP, CandAddr2xDP, Candidate2xDP, HistBufLen1xDP,
|
process (CandAddr1xDP, CandAddr2xDP, CandLen2xDP, Candidate2xDP,
|
HistBufLen2xDP, HistBufOutxD, LookAheadBuf1xDP, LookAheadBuf2xDP,
|
HistBufLen1xDP, HistBufLen2xDP, HistBufOutxD, LookAheadBuf1xDP,
|
LookAheadLen1xDP, LookAheadLen2xDP, LookAheadPtr1xDP, MaxCandLenxD,
|
LookAheadBuf2xDP, LookAheadLen1xDP, LookAheadLen2xDP,
|
Strobe1xSP)
|
LookAheadPtr1xDP, LookAheadPtr2xDP, MaxCandLenxD, Strobe1xSP)
|
begin
|
begin
|
Candidate2xDN <= Candidate2xDP;
|
Candidate2xDN <= Candidate2xDP;
|
LookAheadBuf2xDN <= LookAheadBuf2xDP;
|
LookAheadBuf2xDN <= LookAheadBuf2xDP;
|
LookAheadLen2xDN <= LookAheadLen2xDP;
|
LookAheadLen2xDN <= LookAheadLen2xDP;
|
CandAddr2xDN <= CandAddr2xDP;
|
CandAddr2xDN <= CandAddr2xDP;
|
|
LookAheadPtr2xDN <= LookAheadPtr2xDP;
|
HistBufLen2xDN <= HistBufLen2xDP;
|
HistBufLen2xDN <= HistBufLen2xDP;
|
|
CandLen2xDN <= CandLen2xDP;
|
|
-- send data through pipeline when strobe is high
|
if Strobe1xSP = '1' then
|
if Strobe1xSP = '1' then
|
|
-- note: the history buffer can't load data only from addresses where the
|
|
-- last two bits are zero. If this was not the case we shift the candidate
|
|
-- (which makes it shorter) to correct that
|
case CandAddr1xDP(1 downto 0) is
|
case CandAddr1xDP(1 downto 0) is
|
when "00" => Candidate2xDN <= HistBufOutxD; -- no shifting
|
when "00" => Candidate2xDN <= HistBufOutxD; -- no shifting
|
CandLen2xD <= MaxCandLenxD;
|
CandLen2xDN <= MaxCandLenxD;
|
when "01" => Candidate2xDN <= x"00" & HistBufOutxD(LOOK_AHEAD_LEN*8-1 downto 8); -- shift one byte
|
when "01" => Candidate2xDN <= x"00" & HistBufOutxD(LOOK_AHEAD_LEN*8-1 downto 8); -- shift one byte
|
CandLen2xD <= MaxCandLenxD-1; -- we shifted one byte out -> candidate is one byte shorter
|
CandLen2xDN <= MaxCandLenxD-1; -- we shifted one byte out -> candidate is one byte shorter
|
when "10" => Candidate2xDN <= x"0000" & HistBufOutxD(LOOK_AHEAD_LEN*8-1 downto 16); -- shift 2 bytes
|
when "10" => Candidate2xDN <= x"0000" & HistBufOutxD(LOOK_AHEAD_LEN*8-1 downto 16); -- shift 2 bytes
|
CandLen2xD <= MaxCandLenxD-2;
|
CandLen2xDN <= MaxCandLenxD-2;
|
when "11" => Candidate2xDN <= x"000000" & HistBufOutxD(LOOK_AHEAD_LEN*8-1 downto 24); -- shift 3 bytes
|
when "11" => Candidate2xDN <= x"000000" & HistBufOutxD(LOOK_AHEAD_LEN*8-1 downto 24); -- shift 3 bytes
|
CandLen2xD <= MaxCandLenxD-3;
|
CandLen2xDN <= MaxCandLenxD-3;
|
when others => null;
|
when others => null;
|
end case;
|
end case;
|
|
|
LookAheadBuf2xDN <= LookAheadBuf1xDP;
|
LookAheadBuf2xDN <= LookAheadBuf1xDP;
|
LookAheadLen2xDN <= LookAheadLen1xDP;
|
LookAheadLen2xDN <= LookAheadLen1xDP;
|
CandAddr2xDN <= CandAddr1xDP;
|
CandAddr2xDN <= CandAddr1xDP;
|
-- NextWrAdr2xDN <= NextWrAdr1xDP;
|
-- NextWrAdr2xDN <= NextWrAdr1xDP;
|
LookAheadPtr2xDN <= LookAheadPtr1xDP;
|
LookAheadPtr2xDN <= LookAheadPtr1xDP;
|
HistBufLen2xDN <= HistBufLen1xDP;
|
HistBufLen2xDN <= HistBufLen1xDP;
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
-- signals to be passed on to next stage
|
-- signals to be passed on to next stage
|
HashTableEntry2xDN <= HashTableEntryxD;
|
HashTableEntry2xDN <= HashTableEntryxD;
|
Strobe2xSN <= Strobe1xSP;
|
Strobe2xSN <= Strobe1xSP;
|
EndOfData2xSN <= EndOfData1xSP;
|
EndOfData2xSN <= EndOfData1xSP;
|
|
|
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- Pipeline Stage 3
|
-- Pipeline Stage 3
|
--
|
--
|
-- Comparator, Offset Calculation and Data Output
|
-- Comparator, Offset Calculation and Data Output
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
|
|
-- reformat two dimensional look ahead buffer into one dimensional array
|
-- reformat two dimensional look ahead buffer into one dimensional array
|
-- not nice, I know. We should have a package defining proper types and use
|
-- not nice, I know. We should have a package defining proper types and use
|
-- them consistently...
|
-- them consistently...
|
arrayReformatter : for i in 0 to LOOK_AHEAD_LEN-1 generate
|
arrayReformatter : for i in 0 to LOOK_AHEAD_LEN-1 generate
|
CompLAIn3xD((i+1)*8-1 downto i*8) <= LookAheadBuf2xDP(i);
|
CompLAIn3xD((i+1)*8-1 downto i*8) <= LookAheadBuf2xDP(i);
|
end generate arrayReformatter;
|
end generate arrayReformatter;
|
|
|
comparatorInst : comparator
|
comparatorInst : comparator
|
port map (
|
port map (
|
LookAheadxDI => CompLAIn3xD,
|
LookAheadxDI => CompLAIn3xD,
|
LookAheadLenxDI => LookAheadLen2xDP,
|
LookAheadLenxDI => LookAheadLen2xDP,
|
CandidatexDI => Candidate2xDP,
|
CandidatexDI => Candidate2xDP,
|
CandidateLenxDI => CandLen2xD,
|
CandidateLenxDI => CandLen2xDP,
|
MatchLenxDO => MatchLenxD);
|
MatchLenxDO => MatchLenxD);
|
|
|
-- calculate the offset
|
-- calculate the offset
|
process (CandAddr2xDP, LookAheadPtr2xDP, OffsetIntxD)
|
process (CandAddr2xDP, LookAheadPtr2xDP, OffsetIntxD)
|
begin
|
begin
|
OffsetIntxD <= -1; -- default: illegal offset
|
OffsetIntxD <= -1; -- default: illegal offset
|
if to_integer(unsigned(LookAheadPtr2xDP)) > to_integer(unsigned(CandAddr2xDP)) then
|
if to_integer(unsigned(LookAheadPtr2xDP)) > to_integer(unsigned(CandAddr2xDP)) then
|
-- this is the regular case, the candidate address is smaller (ie in the
|
-- this is the regular case, the candidate address is smaller (ie in the
|
-- past) than the byte to be encoded (which is at index given by lookAheadPtr)
|
-- past) than the byte to be encoded (which is at index given by lookAheadPtr)
|
OffsetIntxD <= to_integer(unsigned(LookAheadPtr2xDP)) - to_integer(unsigned(CandAddr2xDP)) - 1;
|
OffsetIntxD <= to_integer(unsigned(LookAheadPtr2xDP)) - to_integer(unsigned(CandAddr2xDP)) - 1;
|
elsif to_integer(unsigned(LookAheadPtr2xDP)) < to_integer(unsigned(CandAddr2xDP)) then
|
elsif to_integer(unsigned(LookAheadPtr2xDP)) < to_integer(unsigned(CandAddr2xDP)) then
|
-- there is a buffer wrap around between the two pointers, the offset
|
-- there is a buffer wrap around between the two pointers, the offset
|
-- would be negative -> add buffer length
|
-- would be negative -> add buffer length
|
OffsetIntxD <= HIST_BUF_LEN + to_integer(unsigned(LookAheadPtr2xDP)) - to_integer(unsigned(CandAddr2xDP)) - 1;
|
OffsetIntxD <= HIST_BUF_LEN + to_integer(unsigned(LookAheadPtr2xDP)) - to_integer(unsigned(CandAddr2xDP)) - 1;
|
else
|
else
|
-- this means that the candidate and the history buffer (byte to be
|
-- this means that the candidate and the history buffer (byte to be
|
-- encoded) are on the same location. This is invalid as the candidate can't be
|
-- encoded) are on the same location. This is invalid as the candidate can't be
|
-- in the future -> create an illeagal negative offset to invalidate this match
|
-- in the future -> create an illeagal negative offset to invalidate this match
|
OffsetIntxD <= -1;
|
OffsetIntxD <= -1;
|
end if;
|
end if;
|
OffsetxD <= std_logic_vector(to_unsigned(OffsetIntxD, 12));
|
OffsetxD <= std_logic_vector(to_unsigned(OffsetIntxD, 12));
|
end process;
|
end process;
|
|
|
Done3xSN <= EncDonexS and FifoBuffersEmptyxS;
|
Done3xSN <= EncDonexS and FifoBuffersEmptyxS;
|
|
|
-- note: the offset can't be longer than the history buffer length
|
-- note: the offset can't be longer than the history buffer length
|
-- if the offset is too long we disable the match by setting the length to 0
|
-- if the offset is too long we disable the match by setting the length to 0
|
-- we also check for illegal negative offsets
|
-- we also check for illegal negative offsets
|
MatchLenLimitedxD <= MatchLenxD when OffsetIntxD < (HistBufLen2xDP) and OffsetIntxD >= 0 else 0;
|
MatchLenLimitedxD <= MatchLenxD when OffsetIntxD < (HistBufLen2xDP) and OffsetIntxD >= 0 else 0;
|
|
|
outputEncoderInst : outputEncoder
|
outputEncoderInst : outputEncoder
|
generic map (
|
generic map (
|
frameSize => 8,
|
frameSize => 8,
|
minMatchLen => 3,
|
minMatchLen => 3,
|
maxMatchLen => LOOK_AHEAD_LEN)
|
maxMatchLen => LOOK_AHEAD_LEN)
|
port map (
|
port map (
|
ClkxCI => ClkxCI,
|
ClkxCI => ClkxCI,
|
RstxRI => RstxRI,
|
RstxRI => RstxRI,
|
OffsetxDI => OffsetxD,
|
OffsetxDI => OffsetxD,
|
MatchLengthxDI => MatchLenLimitedxD,
|
MatchLengthxDI => MatchLenLimitedxD,
|
EnxSI => Strobe2xSP,
|
EnxSI => Strobe2xSP,
|
EndOfDataxSI => EndOfData2xSP,
|
EndOfDataxSI => EndOfData2xSP,
|
LiteralxDI => LookAheadBuf2xDP(0),
|
LiteralxDI => LookAheadBuf2xDP(0),
|
BodyStrobexSO => BodyStrobexS,
|
BodyStrobexSO => BodyStrobexS,
|
BodyOutxDO => BodyDataxD,
|
BodyOutxDO => BodyDataxD,
|
HeaderStrobexSO => HeaderStrobexS,
|
HeaderStrobexSO => HeaderStrobexS,
|
HeaderOutxDO => HeaderDataxD,
|
HeaderOutxDO => HeaderDataxD,
|
DonexSO => EncDonexS);
|
DonexSO => EncDonexS);
|
|
|
|
|
outputFIFOInst : outputFIFO
|
outputFIFOInst : outputFIFO
|
generic map (
|
generic map (
|
frameSize => 8) -- number of elements (pairs or literals) per frame
|
frameSize => 8) -- number of elements (pairs or literals) per frame
|
port map (
|
port map (
|
ClkxCI => ClkxCI,
|
ClkxCI => ClkxCI,
|
RstxRI => RstxRI,
|
RstxRI => RstxRI,
|
BodyDataxDI => BodyDataxD,
|
BodyDataxDI => BodyDataxD,
|
BodyStrobexSI => BodyStrobexS,
|
BodyStrobexSI => BodyStrobexS,
|
HeaderDataxDI => HeaderDataxD,
|
HeaderDataxDI => HeaderDataxD,
|
HeaderStrobexSI => HeaderStrobexS,
|
HeaderStrobexSI => HeaderStrobexS,
|
BuffersEmptyxSO => FifoBuffersEmptyxS,
|
BuffersEmptyxSO => FifoBuffersEmptyxS,
|
BufOutxDO => BufOutxDO,
|
BufOutxDO => BufOutxDO,
|
OutputValidxSO => OutputValidxSO,
|
OutputValidxSO => OutputValidxSO,
|
RdStrobexSI => RdStrobexSI,
|
RdStrobexSI => RdStrobexSI,
|
LengthxDO => OutFIFOLengthxD);
|
LengthxDO => OutFIFOLengthxD);
|
|
|
LengthxDO <= OutFIFOLengthxD;
|
LengthxDO <= OutFIFOLengthxD;
|
DonexSO <= Done3xSP;
|
DonexSO <= Done3xSP;
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- GENERAL STUFF
|
-- GENERAL STUFF
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
registers : process (ClkxCI)
|
registers : process (ClkxCI)
|
begin -- process registers
|
begin -- process registers
|
if ClkxCI'event and ClkxCI = '1' then
|
if ClkxCI'event and ClkxCI = '1' then
|
if RstxRI = '1' then
|
if RstxRI = '1' then
|
StatexSP <= ST_FILL_LOOK_AHEAD;
|
StatexSP <= ST_FILL_LOOK_AHEAD;
|
BusyxSP <= '0';
|
BusyxSP <= '0';
|
ShiftLookAheadxSP <= '0';
|
ShiftLookAheadxSP <= '0';
|
lookAheadLenxDP <= 0;
|
lookAheadLenxDP <= 0;
|
Strobe0xSP <= '0';
|
Strobe0xSP <= '0';
|
LookAheadLen1xDP <= 0;
|
LookAheadLen1xDP <= 0;
|
Strobe1xSP <= '0';
|
Strobe1xSP <= '0';
|
WrAdr1xDP <= (others => '0');
|
WrAdr1xDP <= (others => '0');
|
LookAheadLen2xDP <= 0;
|
LookAheadLen2xDP <= 0;
|
Strobe2xSP <= '0';
|
Strobe2xSP <= '0';
|
HistBufLen0xDP <= 0;
|
HistBufLen0xDP <= 0;
|
EndOfData0xSP <= '0';
|
EndOfData0xSP <= '0';
|
EndOfData1xSP <= '0';
|
EndOfData1xSP <= '0';
|
EndOfData2xSP <= '0';
|
EndOfData2xSP <= '0';
|
Done3xSP <= '0';
|
Done3xSP <= '0';
|
else
|
else
|
StatexSP <= StatexSN;
|
StatexSP <= StatexSN;
|
BusyxSP <= BusyxSN;
|
BusyxSP <= BusyxSN;
|
ShiftLookAheadxSP <= ShiftLookAheadxSN;
|
ShiftLookAheadxSP <= ShiftLookAheadxSN;
|
lookAheadLenxDP <= lookAheadLenxDN;
|
lookAheadLenxDP <= lookAheadLenxDN;
|
lookAheadBufxDP <= lookAheadBufxDN;
|
lookAheadBufxDP <= lookAheadBufxDN;
|
Strobe0xSP <= Strobe0xSN;
|
Strobe0xSP <= Strobe0xSN;
|
HistBufLen0xDP <= HistBufLen0xDN;
|
HistBufLen0xDP <= HistBufLen0xDN;
|
DataIn0xDP <= DataIn0xDN;
|
DataIn0xDP <= DataIn0xDN;
|
lookAheadLen1xDP <= lookAheadLen1xDN;
|
lookAheadLen1xDP <= lookAheadLen1xDN;
|
Strobe1xSP <= Strobe1xSN;
|
Strobe1xSP <= Strobe1xSN;
|
HistBufLen1xDP <= HistBufLen1xDN;
|
HistBufLen1xDP <= HistBufLen1xDN;
|
WrAdr1xDP <= WrAdr1xDN;
|
WrAdr1xDP <= WrAdr1xDN;
|
LookAheadPtr1xDP <= LookAheadPtr1xDN;
|
LookAheadPtr1xDP <= LookAheadPtr1xDN;
|
LookAheadBuf1xDP <= LookAheadBuf1xDN;
|
LookAheadBuf1xDP <= LookAheadBuf1xDN;
|
LookAheadLen2xDP <= LookAheadLen2xDN;
|
LookAheadLen2xDP <= LookAheadLen2xDN;
|
LookAheadBuf2xDP <= LookAheadBuf2xDN;
|
LookAheadBuf2xDP <= LookAheadBuf2xDN;
|
CandAddr1xDP <= CandAddr1xDN;
|
CandAddr1xDP <= CandAddr1xDN;
|
Strobe2xSP <= Strobe2xSN;
|
Strobe2xSP <= Strobe2xSN;
|
HistBufLen2xDP <= HistBufLen2xDN;
|
HistBufLen2xDP <= HistBufLen2xDN;
|
NextWrAdr2xDP <= NextWrAdr2xDN;
|
NextWrAdr2xDP <= NextWrAdr2xDN;
|
LookAheadPtr2xDP <= LookAheadPtr2xDN;
|
LookAheadPtr2xDP <= LookAheadPtr2xDN;
|
CandAddr2xDP <= CandAddr2xDN;
|
CandAddr2xDP <= CandAddr2xDN;
|
Candidate2xDP <= Candidate2xDN;
|
Candidate2xDP <= Candidate2xDN;
|
|
CandLen2xDP <= CandLen2xDN;
|
HashTableEntry2xDP <= HashTableEntry2xDN;
|
HashTableEntry2xDP <= HashTableEntry2xDN;
|
EndOfData0xSP <= EndOfData0xSN;
|
EndOfData0xSP <= EndOfData0xSN;
|
EndOfData1xSP <= EndOfData1xSN;
|
EndOfData1xSP <= EndOfData1xSN;
|
EndOfData2xSP <= EndOfData2xSN;
|
EndOfData2xSP <= EndOfData2xSN;
|
Done3xSP <= Done3xSN;
|
Done3xSP <= Done3xSN;
|
|
|
end if;
|
end if;
|
end if;
|
end if;
|
end process registers;
|
end process registers;
|
|
|
end Behavioral;
|
end Behavioral;
|
|
|
|
|
