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ADD: switched to a fork of the used UART

This commit is contained in:
Dominik Meyer 2014-01-05 03:14:50 +01:00
parent dbd8ef11a1
commit 4f00cedb90
12 changed files with 515 additions and 352 deletions
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src/Modules/UART/License Normal file
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3
src/Modules/UART/Makefile.files Normal file
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@ -0,0 +1,3 @@
VHDL_SRC += Receiver.vhd ReceiverAndFifo.vhd Sender.vhd SenderAndFifo.vhd UART.vhd
VHDL_PKG +=
VHDL_TB +=

8
src/Modules/UART/README Normal file
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@ -0,0 +1,8 @@
Uart Component
---------------------
Component is a fork of the UART Component written by Marcel Eckert marcel.eckert@hsu-hh.de
at the Helmut Schmidt University in Hamburg.
The main difference at the moment is the usage of the SimpleFifo Component as Fifos
not multiple Implementations for different FPGAs.

24
src/UART/Receiver.vhd → src/Modules/UART/Receiver.vhd
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@ -27,15 +27,17 @@ entity Receiver is
ie4BaudClkEn : in std_logic;reset : in std_logic; --! signal description asynchronous reset
Rx : in STD_LOGIC; --! signal description signal for the RS232 Rx line
data : out STD_LOGIC_VECTOR (7 downto 0); --! signal description last data received
parity : out std_logic; --! signal description
icEnableParity: in std_logic; --! signal description Enable reception of the parity bit
ready : out STD_LOGIC); --! '0' signals receving in progress, if '1' after a previous '0' signals data available at <data>
end Receiver;
architecture Behavioral of Receiver is
signal z, tz : integer range 0 to 63;
signal result, tresult : STD_LOGIC_VECTOR(7 downto 0);
signal sdParity : std_logic;
begin
process (z, Rx)
process (z, Rx, icEnableParity)
begin
if z = 0 then
if (Rx ='0') then
@ -46,7 +48,8 @@ begin
elsif z <= 36 then
tz <= z + 1;
elsif (z <= 40 and icEnableParity='1') then
tz <= z+1;
else
tz <= 0;
@ -55,11 +58,12 @@ begin
tresult <= Rx & result(7 downto 1);
process (reset, iSysClk)
process (iSysClk)
begin
if (iSysClk'event and iSysClk = '1') then
if reset = '1' then
z <= 0;
sdParity <= '0';
elsif ie4BaudClkEn = '1' then
z <= tz;
case z is
@ -87,7 +91,14 @@ begin
when 33 =>
result <= tresult; -- D(7)
when 37 =>
result <= result;
if (icEnableParity='1') then
sdParity <= Rx;
else
sdParity <= '0';
end if;
-- optional TODO: add check for STOP-Bit(s)
when others => result <= result;
@ -95,7 +106,8 @@ begin
end if;
end if;
end process;
parity <= sdParity;
data <= result;
ready <= '1' when z = 0 else '0';

118
src/UART/ReceiverAndFifo.vhd → src/Modules/UART/ReceiverAndFifo.vhd
View File

@ -22,20 +22,21 @@ use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity ReceiverAndFifo is
port (
iSysClk : in std_logic; --! signal description System side clock
ieClkEn : in std_logic;
iSysClk : in std_logic; --! signal description System side clock
ieClkEn : in std_logic;
ie4xBaudClkEn : in std_logic; --! signal description UART clock (4xBAUD Rate frequency!)
iReset : in std_logic; --! signal description asynchronous reset
odDataRcvd : out std_logic_vector(7 downto 0); --! signal description data from Fifo
ocREmpty : out std_logic; --! signal description indicates that Fifo is empty
ocRFull : out std_logic; --! signal description indicates that Fifo is full
ocRAlmostE : out std_logic; --! signal description indicates that Fifo is empty to half full
ocRAlmostF : out std_logic; --! signal description indicates that Fifo is half full to full
icRReadEn : in std_logic; --! signal description get next value from Fifo (Fifo is in First Word Fall Through Mode!)
idReceive : in std_logic --! signal description signal for the RS232 Tx line
iReset : in std_logic; --! signal description asynchronous reset
icEnableParity: in std_logic; --! signal description allow reception of parity bit
odDataRcvd : out std_logic_vector(7 downto 0); --! signal description data from Fifo
odParity : out std_logic; --! possible parity bit
ocREmpty : out std_logic; --! signal description indicates that Fifo is empty
ocRFull : out std_logic; --! signal description indicates that Fifo is full
ocRAlmostE : out std_logic; --! signal description indicates that Fifo is empty to half full
ocRAlmostF : out std_logic; --! signal description indicates that Fifo is half full to full
icRReadEn : in std_logic; --! signal description get next value from Fifo (Fifo is in First Word Fall Through Mode!)
idReceive : in std_logic --! signal description signal for the RS232 Tx line
);
end ReceiverAndFifo;
@ -43,39 +44,50 @@ architecture arch of ReceiverAndFifo is
component Receiver is
port (
iSysClk : in std_logic;
ie4BaudClkEn : in std_logic;
reset : in STD_LOGIC;
Rx : in STD_LOGIC;
data : out STD_LOGIC_VECTOR (7 downto 0);
ready : out STD_LOGIC);
iSysClk : in std_logic;
ie4BaudClkEn : in std_logic;
reset : in STD_LOGIC;
Rx : in STD_LOGIC;
data : out STD_LOGIC_VECTOR (7 downto 0);
parity : out std_logic;
icEnableParity: in std_logic;
ready : out STD_LOGIC);
end component;
component Fifo is
port (
iReset : in std_logic;
iClkWrite : in std_logic;
icWriteEn : in std_logic;
iClkRead : in std_logic;
icReadEn : in std_logic;
idDataIn : in std_logic_vector(7 downto 0);
odDataOut : out std_logic_vector(7 downto 0);
ocEmpty : out std_logic;
ocFull : out std_logic;
ocAlmostE : out std_logic;
ocAlmostF : out std_logic
);
end component;
component SimpleFifo is
generic (
GEN_WIDTH : integer := 9; --! Data width of each data word
GEN_DEPTH : integer := 256; --! how many values can be stored in Fifo
GEN_A_EMPTY : integer := 2; --! when is the FIFO signaled as almost empty
GEN_A_FULL : integer := 250 --! when is the FIFO signaled as almost full
);
port (
icReset : in std_logic;
icWriteClk : in std_logic;
icWe : in std_logic;
icReadClk : in std_logic;
icReadEnable : in std_logic;
idData : in std_logic_vector(8 downto 0);
odData : out std_logic_vector(8 downto 0);
ocEmpty : out std_logic;
ocFull : out std_logic;
ocAempty : out std_logic;
ocAfull : out std_logic
);
end component;
signal scRWrite : std_logic;
signal scRWriteEn : std_logic;
signal seRReadEn : std_logic;
signal sdDataRcvd : STD_LOGIC_VECTOR (7 downto 0);
signal sdDataRcvd : STD_LOGIC_VECTOR (8 downto 0);
signal sdParity : std_logic;
signal scRcvrEmpty : std_logic;
signal scRcvrFull : std_logic;
@ -90,24 +102,25 @@ begin
scRWriteEn <= scRWrite and ie4xBaudClkEn;
seRReadEn <= icRReadEn and ieClkEn;
rcvFifo : Fifo
rcvFifo : SimpleFifo
PORT MAP(
iReset => iReset,
icReset => iReset,
iClkWrite => iSysClk,
icWriteEn => scRWriteEn,
icWriteClk => iSysClk,
icWe => scRWriteEn,
iClkRead => iSysClk,
icReadEn => seRReadEn,
icReadClk => iSysClk,
icReadEnable => seRReadEn,
idDataIn => sdDataRcvd,
odDataOut => odDataRcvd,
idData => sdDataRcvd,
odData(8 downto 1) => odDataRcvd,
odData(0) => odParity,
ocEmpty => scRcvrEmpty,
ocFull => scRcvrFull,
ocAlmostE => scRcvrAEmpty,
ocAlmostF => scRcvrAFull
ocAempty => scRcvrAEmpty,
ocAfull => scRcvrAFull
);
ocREmpty <= scRcvrEmpty;
@ -121,10 +134,13 @@ begin
ie4BaudClkEn => ie4xBaudClkEn,
reset => iReset,
Rx => idReceive,
data => sdDataRcvd,
data => sdDataRcvd(8 downto 1),
parity => sdDataRcvd(0),
icEnableParity => icEnableParity,
ready => scReaderReady
);
ReceiverCtrl : process (iSysClk)
begin
if (rising_edge(iSysClk)) then

23
src/UART/Sender.vhd → src/Modules/UART/Sender.vhd
View File

@ -27,15 +27,17 @@ entity Sender is
iReset : in STD_LOGIC; --! signal description synchronous reset
icSend : in STD_LOGIC; --! signal description force a send of <idData>
idData : in STD_LOGIC_VECTOR (7 downto 0); --! signal description the data to be sent
idParity : in std_logic; --! signal description the parity bit of the data
icEnableParity:in std_logic; --! signal description enable sending of the parity bit
odTransmit : out STD_LOGIC; --! signal description signal for the RS232 Tx line
ocReady : out STD_LOGIC; --! signal description signals availability of the Sender (no Sending in Progress)
ocSyn : out STD_LOGIC); --! signal description signals sending of first Stop Bit
end Sender;
architecture Behavioral of Sender is
signal temp, tnext :STD_LOGIC_VECTOR(11 downto 0);
signal temp, tnext :STD_LOGIC_VECTOR(12 downto 0);
type StateType is (WAITING, INIT, HIGH, START, DATA0, DATA1, DATA2, DATA3, DATA4, DATA5, DATA6, DATA7, STOP1, STOP2);
type StateType is (WAITING, INIT, HIGH, START, DATA0, DATA1, DATA2, DATA3, DATA4, DATA5, DATA6, DATA7, PARITY, STOP1, STOP2);
signal state : StateType;
begin
process(iSysClk)
@ -53,7 +55,11 @@ begin
case state is
when WAITING =>
if (icSend = '1') then
temp <= "11" & idData & "01";
if (icEnableParity = '1') then
temp <= "11" & idParity & idData & "01";
else
temp <= "111" & idData & "01";
end if;
state <= INIT;
else
state <= WAITING;
@ -90,7 +96,14 @@ begin
state <= DATA7;
when DATA7 =>
state <= STOP1;
if (icEnableParity = '1') then
state <= PARITY;
else
state <= STOP1;
end if;
when PARITY =>
state <= STOP1;
when STOP1 =>
state <= STOP2;
@ -104,7 +117,7 @@ begin
end if;
end process;
tnext <= '1' & temp(11 downto 1);
tnext <= '1' & temp(12 downto 1);
ocReady <= '1' when state = WAITING else
'0';

84
src/UART/SenderAndFifo.vhd → src/Modules/UART/SenderAndFifo.vhd
View File

@ -32,6 +32,8 @@ entity SenderAndFifo is
icSend : in std_logic; --! signal description add data <idDataSend> to Fifo (Enable Signal)
idDataSend : in std_logic_vector(7 downto 0); --! signal description data to be added to the Fifo
idParity : in std_logic; --! signal description the parity bit for the data
icEnableParity: in std_logic; --! signal description enable the sending of the parity bit
ocSEmpty : out std_logic; --! signal description indicates that Fifo is empty
ocSFull : out std_logic; --! signal description indicates that Fifo is full
ocSAlmostE : out std_logic; --! signal description indicates that Fifo is empty to half full
@ -49,36 +51,46 @@ architecture arch of SenderAndFifo is
iReset : in STD_LOGIC;
icSend : in STD_LOGIC;
idData : in STD_LOGIC_VECTOR (7 downto 0);
idParity : in std_logic;
icEnableParity:in std_logic;
odTransmit : out STD_LOGIC;
ocReady : out STD_LOGIC;
ocSyn : out STD_LOGIC);
end component;
component Fifo is
port (
iReset : in std_logic;
iClkWrite : in std_logic;
icWriteEn : in std_logic;
iClkRead : in std_logic;
icReadEn : in std_logic;
idDataIn : in std_logic_vector(7 downto 0);
odDataOut : out std_logic_vector(7 downto 0);
ocEmpty : out std_logic;
ocFull : out std_logic;
ocAlmostE : out std_logic;
ocAlmostF : out std_logic
);
end component;
component SimpleFifo is
generic (
GEN_WIDTH : integer := 9; --! Data width of each data word
GEN_DEPTH : integer := 256; --! how many values can be stored in Fifo
GEN_A_EMPTY : integer := 2; --! when is the FIFO signaled as almost empty
GEN_A_FULL : integer := 250 --! when is the FIFO signaled as almost full
);
port (
icReset : in std_logic;
icWriteClk : in std_logic;
icWe : in std_logic;
icReadClk : in std_logic;
icReadEnable : in std_logic;
idData : in std_logic_vector(8 downto 0);
odData : out std_logic_vector(8 downto 0);
ocEmpty : out std_logic;
ocFull : out std_logic;
ocAempty : out std_logic;
ocAfull : out std_logic
);
end component;
signal scSenderRead : std_logic;
signal scSenderReadEn : std_logic;
signal sdDataToSend : STD_LOGIC_VECTOR (7 downto 0);
signal sdDataToSend : STD_LOGIC_VECTOR (8 downto 0);
signal scSenderEmpty : std_logic;
signal scSenderFull : std_logic;
signal scSenderAEmpty : std_logic;
@ -93,31 +105,35 @@ architecture arch of SenderAndFifo is
signal seSend : std_logic;
signal sdFifoDataIn : std_logic_vector(8 downto 0);
begin
scSenderReadEn <= scSenderRead and ieBaudClkEn;
seSend <= icSend and ieClkEn;
sendFifo : Fifo
sendFifo : SimpleFifo
PORT MAP(
iReset => iReset,
icReset => iReset,
iClkWrite => iSysClk,
icWriteEn => seSend,
icWriteClk => iSysClk,
icWe => seSend,
iClkRead => iSysClk,
icReadEn => scSenderReadEn,
icReadClk => iSysClk,
icReadEnable => scSenderReadEn,
idDataIn => idDataSend,
odDataOut => sdDataToSend,
idData => sdFifoDataIn,
odData => sdDataToSend,
ocEmpty => scSenderEmpty,
ocFull => scSenderFull,
ocAlmostE => scSenderAEmpty,
ocAlmostF => scSenderAFull
ocAempty => scSenderAEmpty,
ocAfull => scSenderAFull
);
sdFifoDataIn <= idDataSend & idParity;
ocSEmpty <= scSenderEmpty;
ocSFull <= scSenderFull;
ocSAlmostE <= scSenderAEmpty;
@ -129,7 +145,9 @@ begin
ieBaudClkEn => ieBaudClkEn,
iReset => iReset,
icSend => scSenderSendReq,
idData => sdDataToSend,
idData => sdDataToSend(8 downto 1),
idParity => sdDataToSend(0),
icEnableParity=>icEnableParity,
odTransmit => odTransmit,
ocReady => scSenderReady,
ocSyn => scSyn

13
src/UART/UART.vhd → src/Modules/UART/UART.vhd
View File

@ -29,9 +29,10 @@ entity UART is
iReset : in std_logic;
icBaudLExt : in integer := 0;
icEnableParity : in std_logic := '0';
icSend : in std_logic;
idDataSend : in std_logic_vector(7 downto 0);
idParity : in std_logic := '0';
ocSEmpty : out std_logic;
ocSFull : out std_logic;
ocSAlmostE : out std_logic;
@ -40,6 +41,7 @@ entity UART is
odTransmit : out std_logic;
odDataRcvd : out std_logic_vector(7 downto 0);
odParity : out std_logic;
ocREmpty : out std_logic;
ocRFull : out std_logic;
ocRAlmostE : out std_logic;
@ -90,9 +92,10 @@ architecture arch of UART is
ieClkEn : in std_logic;
ieBaudClkEn : in std_logic;
iReset : in std_logic;
icSend : in std_logic;
idDataSend : in std_logic_vector(7 downto 0);
idParity : in std_logic;
icEnableParity : in std_logic;
ocSEmpty : out std_logic;
ocSFull : out std_logic;
ocSAlmostE : out std_logic;
@ -110,6 +113,8 @@ architecture arch of UART is
iReset : in std_logic;
odDataRcvd : out std_logic_vector(7 downto 0);
odParity : out std_logic;
icEnableParity:in std_logic;
ocREmpty : out std_logic;
ocRFull : out std_logic;
ocRAlmostE : out std_logic;
@ -189,7 +194,9 @@ end generate;
iReset => iReset,
icSend => icSend,
icEnableParity=> icEnableParity,
idDataSend => idDataSend,
idParity => idParity,
ocSEmpty => ocSEmpty,
ocSFull => ocSFull,
ocSAlmostE => ocSAlmostE,
@ -205,7 +212,9 @@ end generate;
ie4xBaudClkEn => se4BaudReceiver,
iReset => iReset,
icEnableParity=>icEnableParity,
odDataRcvd => odDataRcvd,
odParity => odParity,
ocREmpty => ocREmpty,
ocRFull => ocRFull,
ocRAlmostE => ocRAlmostE,

84
src/UART/Fifo.vhd
View File

@ -1,84 +0,0 @@
--------------------------------------------------------------------------------
-- Entity: Fifo
--------------------------------------------------------------------------------
-- Copyright ... 2011
-- Filename : Fifo.vhd
-- Creation date : 2011-05-27
-- Author(s) : marcel
-- Version : 1.00
-- Description : <short description>
--------------------------------------------------------------------------------
-- File History:
-- Date Version Author Comment
-- 2011-05-27 1.00 marcel Creation of File
--------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
Library UNISIM;
use UNISIM.vcomponents.all;
entity Fifo is
port (
iReset : in std_logic;
iClkWrite : in std_logic;
icWriteEn : in std_logic;
iClkRead : in std_logic;
icReadEn : in std_logic;
idDataIn : in std_logic_vector(7 downto 0);
odDataOut : out std_logic_vector(7 downto 0);
ocEmpty : out std_logic;
ocFull : out std_logic;
ocAlmostE : out std_logic;
ocAlmostF : out std_logic
);
end Fifo;
architecture arch of Fifo is
signal sdDataOut : std_logic_vector(31 downto 0);
signal sdDataIn : std_logic_vector(31 downto 0);
begin
FIFO36_inst : FIFO36
generic map (
ALMOST_FULL_OFFSET => X"0080", -- Sets almost full threshold
ALMOST_EMPTY_OFFSET => X"0080", -- Sets the almost empty threshold
DATA_WIDTH => 9, -- Sets data width to 4, 9, 18, or 36
DO_REG => 1, -- Enable output register ( 0 or 1)
-- Must be 1 if the EN_SYN = FALSE
EN_SYN => FALSE, -- Specified FIFO as Asynchronous (FALSE) or
-- Synchronous (TRUE)
FIRST_WORD_FALL_THROUGH => TRUE, -- Sets the FIFO FWFT to TRUE or FALSE
SIM_MODE => "FAST") -- Simulation: "SAFE" vs "FAST", see "Synthesis and Simulation
-- Design Guide" for details
port map (
ALMOSTEMPTY => ocAlmostE, -- 1-bit almost empty output flag
ALMOSTFULL => ocAlmostF, -- 1-bit almost full output flag
DO => sdDataOut, -- 32-bit data output
DOP => open, -- 4-bit parity data output
EMPTY => ocEmpty, -- 1-bit empty output flag
FULL => ocFull, -- 1-bit full output flag
RDCOUNT => open, -- 13-bit read count output
RDERR => open, -- 1-bit read error output
WRCOUNT => open, -- 13-bit write count output
WRERR => open, -- 1-bit write error
DI => sdDataIn, -- 32-bit data input
DIP => "1111", -- 4-bit parity input
RDCLK => iClkRead, -- 1-bit read clock input
RDEN => icReadEn, -- 1-bit read enable input
RST => iReset, -- 1-bit reset input
WRCLK => iClkWrite, -- 1-bit write clock input
WREN => icWriteEn -- 1-bit write enable input
);
odDataOut <= sdDataOut(7 downto 0);
sdDataIn <= X"000000" & idDataIn;
end arch;

78
src/UART/FifoS3e.vhd
View File

@ -1,78 +0,0 @@
--------------------------------------------------------------------------------
-- Entity: Fifo
--------------------------------------------------------------------------------
-- Copyright ... 2011
-- Filename : Fifo.vhd
-- Creation date : 2011-05-27
-- Author(s) : marcel
-- Version : 1.00
-- Description : <short description>
--------------------------------------------------------------------------------
-- File History:
-- Date Version Author Comment
-- 2011-05-27 1.00 marcel Creation of File
--------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
Library UNISIM;
use UNISIM.vcomponents.all;
entity Fifo is
port (
iReset : in std_logic;
iClkWrite : in std_logic;
icWriteEn : in std_logic;
iClkRead : in std_logic;
icReadEn : in std_logic;
idDataIn : in std_logic_vector(7 downto 0);
odDataOut : out std_logic_vector(7 downto 0);
ocEmpty : out std_logic;
ocFull : out std_logic;
ocAlmostE : out std_logic;
ocAlmostF : out std_logic
);
end Fifo;
architecture arch of Fifo is
component fifo_generator_v7_2
port (
rst: in std_logic;
wr_clk: in std_logic;
rd_clk: in std_logic;
din: in std_logic_vector(7 downto 0);
wr_en: in std_logic;
rd_en: in std_logic;
dout: out std_logic_vector(7 downto 0);
full: out std_logic;
almost_full: out std_logic;
empty: out std_logic;
almost_empty: out std_logic);
end component;
begin
fifo_generator_v7_2_0 : fifo_generator_v7_2
port map (
rst => iReset,
wr_clk => iClkWrite,
rd_clk => iClkRead,
din => idDataIn,
wr_en => icWriteEn,
rd_en => icReadEn,
dout => odDataOut,
full => ocFull,
almost_full => ocAlmostF,
empty => ocEmpty,
almost_empty => ocAlmostE
);
end arch;

79
src/UART/FifoS6.vhd
View File

@ -1,79 +0,0 @@
--------------------------------------------------------------------------------
-- Entity: Fifo
--------------------------------------------------------------------------------
-- Copyright ... 2011
-- Filename : Fifo.vhd
-- Creation date : 2011-05-27
-- Author(s) : marcel
-- Version : 1.00
-- Description : <short description>
--------------------------------------------------------------------------------
-- File History:
-- Date Version Author Comment
-- 2011-05-27 1.00 marcel Creation of File
--------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
Library UNISIM;
use UNISIM.vcomponents.all;
entity Fifo is
port (
iReset : in std_logic;
iClkWrite : in std_logic;
icWriteEn : in std_logic;
iClkRead : in std_logic;
icReadEn : in std_logic;
idDataIn : in std_logic_vector(7 downto 0);
odDataOut : out std_logic_vector(7 downto 0);
ocEmpty : out std_logic;
ocFull : out std_logic;
ocAlmostE : out std_logic;
ocAlmostF : out std_logic
);
end Fifo;
architecture arch of Fifo is
component FifoS6 IS
PORT (
wr_clk : IN STD_LOGIC;
rst : IN STD_LOGIC;
rd_clk : IN STD_LOGIC;
din : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
wr_en : IN STD_LOGIC;
rd_en : IN STD_LOGIC;
dout : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);
full : OUT STD_LOGIC;
almost_full : OUT STD_LOGIC;
empty : OUT STD_LOGIC;
almost_empty : OUT STD_LOGIC
);
END component;
begin
FifoS6_0 : FifoS6
port map (
rst => iReset,
wr_clk => iClkWrite,
rd_clk => iClkRead,
din => idDataIn,
wr_en => icWriteEn,
rd_en => icReadEn,
dout => odDataOut,
full => ocFull,
almost_full => ocAlmostF,
empty => ocEmpty,
almost_empty => ocAlmostE
);
end arch;

14
src/UART/Makefile.files
View File

@ -1,14 +0,0 @@
ifeq ($(FPGA_FAMILY),spartan6)
VHDL_SRC += FifoS6.vhd
else
ifeq ($(FPGA_FAMILY),spartan3e)
VHDL_SRC += FifoS3e.vhd
else
VHDL_SRC += Fifo.vhd
endif
endif
VHDL_SRC += Receiver.vhd ReceiverAndFifo.vhd Sender.vhd SenderAndFifo.vhd UART.vhd
VHDL_PKG +=
VHDL_TB +=