| Line 44... |
Line 44... |
|
|
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- RioSerial
|
-- RioSerial
|
--
|
--
|
|
-- Generics
|
|
-- --------
|
|
-- TIMEOUT_WIDTH - The number of bits to be used in the portLinkTimeout signal.
|
|
-- NUMBER_WORDS - The number of parallell words that the data symbols can
|
|
-- contain. This sizes the data buses. It can be used to increase the bandwidth
|
|
-- of the core. Note that it cannot be larger than 4. This is since two
|
|
-- packets may be completed at the same tick and the interface to the
|
|
-- packetBuffer cannot handle more than one packets in one tick.
|
|
--
|
|
-- Signals
|
|
-- -------
|
|
-- System signals.
|
-- clk - System clock.
|
-- clk - System clock.
|
-- areset_n - System reset. Asynchronous, active low.
|
-- areset_n - System reset. Asynchronous, active low.
|
--
|
--
|
|
-- Configuration signals. These are used to change the runtime behaviour.
|
-- portLinkTimeout_i - The number of ticks to wait for a packet-accepted before
|
-- portLinkTimeout_i - The number of ticks to wait for a packet-accepted before
|
-- a timeout occurrs.
|
-- a timeout occurrs.
|
-- linkInitialized_o - Indicates if a link partner is answering with valid
|
-- linkInitialized_o - Indicates if a link partner is answering with valid
|
-- status-control-symbols.
|
-- status-control-symbols.
|
-- inputPortEnable_i - Activate the input port for non-maintenance packets. If
|
-- inputPortEnable_i - Activate the input port for non-maintenance packets. If
|
| Line 142... |
Line 155... |
-- outbound symbols to read. Once deasserted, outboundSymbol_o will be
|
-- outbound symbols to read. Once deasserted, outboundSymbol_o will be
|
-- already be valid. This signal will be updated one tick after
|
-- already be valid. This signal will be updated one tick after
|
-- outboundSymbolRead_i has been asserted.
|
-- outboundSymbolRead_i has been asserted.
|
-- outboundSymbolRead_i - Indicate that outboundSymbol_o has been read and a
|
-- outboundSymbolRead_i - Indicate that outboundSymbol_o has been read and a
|
-- new value could be accepted. It should be active for one tick.
|
-- new value could be accepted. It should be active for one tick.
|
-- outboundSymbol_o - The outbound symbol. The two MSB bits are the type of the
|
-- REMARK: Update this comment...
|
-- symbol.
|
-- outboundSymbol_o - The outbound symbol. It is divided into two parts,
|
-- bit 34-33
|
-- symbolType and symbolContent.
|
|
-- symbolType - The two MSB bits are the type of the symbol according to
|
|
-- table below:
|
-- 00=IDLE, the rest of the bits are not used.
|
-- 00=IDLE, the rest of the bits are not used.
|
-- 01=CONTROL, the control symbols payload (24 bits) are placed in the MSB
|
-- 01=CONTROL, the control symbols payload (24 bits) are placed in the MSB
|
-- part of the symbol data.
|
-- part of the symbolContent.
|
-- 10=ERROR, the rest of the bits are not used.
|
-- 10=ERROR, the rest of the bits are not used.
|
-- 11=DATA, all the remaining bits contain the data-symbol payload.
|
-- 11=DATA, all the remaining bits contain the number of valid words and
|
|
-- the payload of the symbol.
|
|
-- symbolContent - The rest of the bits are symbol content. If there are
|
|
-- multiple words in the symbols they must be set to zero. The first
|
|
-- received word is placed in the MSB part of this field.
|
-- inboundSymbolFull_o - An asserted signal indicates that no more inbound
|
-- inboundSymbolFull_o - An asserted signal indicates that no more inbound
|
-- symbols can be accepted.
|
-- symbols can be accepted.
|
-- inboundSymbolWrite_i - Indicate that inboundSymbol_i contains valid
|
-- inboundSymbolWrite_i - Indicate that inboundSymbol_i contains valid
|
-- information that should be forwarded. Should be active for one tick.
|
-- information that should be forwarded. Should be active for one tick.
|
-- inboundSymbol_i - The inbound symbol. See outboundSymbol_o for formating.
|
-- inboundSymbol_i - The inbound symbol. See outboundSymbol_o for formating.
|
| Line 167... |
Line 186... |
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- Entity for RioSerial.
|
-- Entity for RioSerial.
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
entity RioSerial is
|
entity RioSerial is
|
generic(
|
generic(
|
TIMEOUT_WIDTH : natural);
|
TIMEOUT_WIDTH : natural;
|
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
port(
|
port(
|
-- System signals.
|
-- System signals.
|
clk : in std_logic;
|
clk : in std_logic;
|
areset_n : in std_logic;
|
areset_n : in std_logic;
|
|
|
| Line 200... |
Line 220... |
readWindowReset_o : out std_logic;
|
readWindowReset_o : out std_logic;
|
readWindowNext_o : out std_logic;
|
readWindowNext_o : out std_logic;
|
readContentEmpty_i : in std_logic;
|
readContentEmpty_i : in std_logic;
|
readContent_o : out std_logic;
|
readContent_o : out std_logic;
|
readContentEnd_i : in std_logic;
|
readContentEnd_i : in std_logic;
|
readContentData_i : in std_logic_vector(31 downto 0);
|
readContentData_i : in std_logic_vector(2+(32*NUMBER_WORDS-1) downto 0);
|
|
|
-- Inbound frame interface.
|
-- Inbound frame interface.
|
writeFrameFull_i : in std_logic;
|
writeFrameFull_i : in std_logic;
|
writeFrame_o : out std_logic;
|
writeFrame_o : out std_logic;
|
writeFrameAbort_o : out std_logic;
|
writeFrameAbort_o : out std_logic;
|
writeContent_o : out std_logic;
|
writeContent_o : out std_logic;
|
writeContentData_o : out std_logic_vector(31 downto 0);
|
writeContentData_o : out std_logic_vector(2+(32*NUMBER_WORDS-1) downto 0);
|
|
|
-- PCS layer signals.
|
-- PCS layer signals.
|
portInitialized_i : in std_logic;
|
portInitialized_i : in std_logic;
|
outboundSymbolEmpty_o : out std_logic;
|
outboundSymbolEmpty_o : out std_logic;
|
outboundSymbolRead_i : in std_logic;
|
outboundSymbolRead_i : in std_logic;
|
outboundSymbol_o : out std_logic_vector(33 downto 0);
|
outboundSymbol_o : out std_logic_vector(((2+32)*NUMBER_WORDS-1) downto 0);
|
inboundSymbolFull_o : out std_logic;
|
inboundSymbolFull_o : out std_logic;
|
inboundSymbolWrite_i : in std_logic;
|
inboundSymbolWrite_i : in std_logic;
|
inboundSymbol_i : in std_logic_vector(33 downto 0));
|
inboundSymbol_i : in std_logic_vector(((2+32)*NUMBER_WORDS-1) downto 0));
|
end entity;
|
end entity;
|
|
|
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- Architecture for RioSerial.
|
-- Architecture for RioSerial.
|
| Line 243... |
Line 263... |
data_i : in std_logic_vector(WIDTH-1 downto 0));
|
data_i : in std_logic_vector(WIDTH-1 downto 0));
|
end component;
|
end component;
|
|
|
component RioTransmitter is
|
component RioTransmitter is
|
generic(
|
generic(
|
TIMEOUT_WIDTH : natural);
|
TIMEOUT_WIDTH : natural;
|
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
port(
|
port(
|
clk : in std_logic;
|
clk : in std_logic;
|
areset_n : in std_logic;
|
areset_n : in std_logic;
|
|
|
portLinkTimeout_i : in std_logic_vector(TIMEOUT_WIDTH-1 downto 0);
|
portLinkTimeout_i : in std_logic_vector(TIMEOUT_WIDTH-1 downto 0);
|
| Line 261... |
Line 282... |
outboundAckId_o : out std_logic_vector(4 downto 0);
|
outboundAckId_o : out std_logic_vector(4 downto 0);
|
|
|
portInitialized_i : in std_logic;
|
portInitialized_i : in std_logic;
|
txFull_i : in std_logic;
|
txFull_i : in std_logic;
|
txWrite_o : out std_logic;
|
txWrite_o : out std_logic;
|
txControl_o : out std_logic_vector(1 downto 0);
|
txType_o : out std_logic_vector(1 downto 0);
|
txData_o : out std_logic_vector(31 downto 0);
|
txData_o : out std_logic_vector(31 downto 0);
|
|
|
txControlEmpty_i : in std_logic;
|
txControlEmpty_i : in std_logic;
|
txControlSymbol_i : in std_logic_vector(12 downto 0);
|
txControlSymbol_i : in std_logic_vector(12 downto 0);
|
txControlUpdate_o : out std_logic;
|
txControlUpdate_o : out std_logic;
|
| Line 285... |
Line 306... |
readWindowReset_o : out std_logic;
|
readWindowReset_o : out std_logic;
|
readWindowNext_o : out std_logic;
|
readWindowNext_o : out std_logic;
|
readContentEmpty_i : in std_logic;
|
readContentEmpty_i : in std_logic;
|
readContent_o : out std_logic;
|
readContent_o : out std_logic;
|
readContentEnd_i : in std_logic;
|
readContentEnd_i : in std_logic;
|
readContentData_i : in std_logic_vector(31 downto 0));
|
readContentWords_i : in std_logic_vector(1 downto 0);
|
|
readContentData_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
end component;
|
end component;
|
|
|
component RioReceiver is
|
component RioReceiver is
|
|
generic(
|
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
port(
|
port(
|
clk : in std_logic;
|
clk : in std_logic;
|
areset_n : in std_logic;
|
areset_n : in std_logic;
|
|
|
portEnable_i : in std_logic;
|
portEnable_i : in std_logic;
|
| Line 302... |
Line 326... |
inboundAckId_o : out std_logic_vector(4 downto 0);
|
inboundAckId_o : out std_logic_vector(4 downto 0);
|
|
|
portInitialized_i : in std_logic;
|
portInitialized_i : in std_logic;
|
rxEmpty_i : in std_logic;
|
rxEmpty_i : in std_logic;
|
rxRead_o : out std_logic;
|
rxRead_o : out std_logic;
|
rxControl_i : in std_logic_vector(1 downto 0);
|
rxType_i : in std_logic_vector(2*NUMBER_WORDS-1 downto 0);
|
rxData_i : in std_logic_vector(31 downto 0);
|
rxData_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
|
txControlWrite_o : out std_logic;
|
txControlWrite_o : out std_logic_vector(NUMBER_WORDS-1 downto 0);
|
txControlSymbol_o : out std_logic_vector(12 downto 0);
|
txControlSymbol_o : out std_logic_vector(12*NUMBER_WORDS downto 0);
|
rxControlWrite_o : out std_logic;
|
rxControlWrite_o : out std_logic_vector(NUMBER_WORDS-1 downto 0);
|
rxControlSymbol_o : out std_logic_vector(12 downto 0);
|
rxControlSymbol_o : out std_logic_vector(12*NUMBER_WORDS downto 0);
|
|
|
ackIdStatus_o : out std_logic_vector(4 downto 0);
|
ackIdStatus_o : out std_logic_vector(4 downto 0);
|
linkInitialized_o : out std_logic;
|
linkInitialized_o : out std_logic;
|
|
|
writeFrameFull_i : in std_logic;
|
writeFrameFull_i : in std_logic;
|
writeFrame_o : out std_logic;
|
writeFrame_o : out std_logic;
|
writeFrameAbort_o : out std_logic;
|
writeFrameAbort_o : out std_logic;
|
writeContent_o : out std_logic;
|
writeContent_o : out std_logic;
|
writeContentData_o : out std_logic_vector(31 downto 0));
|
writeContentWords_o : out std_logic_vector(1 downto 0);
|
|
writeContentData_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
end component;
|
end component;
|
|
|
signal linkInitializedRx : std_logic;
|
signal linkInitializedRx : std_logic;
|
signal linkInitializedTx : std_logic;
|
signal linkInitializedTx : std_logic;
|
signal ackIdStatus : std_logic_vector(4 downto 0);
|
signal ackIdStatus : std_logic_vector(4 downto 0);
|
|
|
signal txControlWrite : std_logic;
|
signal txControlWrite : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
signal txControlWriteSymbol : std_logic_vector(12 downto 0);
|
signal txControlWriteSymbol : std_logic_vector(12*NUMBER_WORDS downto 0);
|
signal txControlReadEmpty : std_logic;
|
signal txControlReadEmpty : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
signal txControlRead : std_logic;
|
signal txControlRead : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
signal txControlReadSymbol : std_logic_vector(12 downto 0);
|
signal txControlReadSymbol : std_logic_vector(12*NUMBER_WORDS downto 0);
|
|
|
signal rxControlWrite : std_logic;
|
signal rxControlWrite : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
signal rxControlWriteSymbol : std_logic_vector(12 downto 0);
|
signal rxControlWriteSymbol : std_logic_vector(12*NUMBER_WORDS downto 0);
|
signal rxControlReadEmpty : std_logic;
|
signal rxControlReadEmpty : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
signal rxControlRead : std_logic;
|
signal rxControlRead : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
signal rxControlReadSymbol : std_logic_vector(12 downto 0);
|
signal rxControlReadSymbol : std_logic_vector(12*NUMBER_WORDS downto 0);
|
|
|
signal outboundFull : std_logic;
|
signal outboundFull : std_logic;
|
signal outboundWrite : std_logic;
|
signal outboundWrite : std_logic;
|
signal outboundControl : std_logic_vector(1 downto 0);
|
signal outboundType : std_logic_vector(1 downto 0);
|
signal outboundData : std_logic_vector(31 downto 0);
|
signal outboundData : std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
signal outboundSymbol : std_logic_vector(33 downto 0);
|
signal outboundSymbol : std_logic_vector(2+(32*NUMBER_WORDS-1) downto 0);
|
|
|
signal inboundEmpty : std_logic;
|
signal inboundEmpty : std_logic;
|
signal inboundRead : std_logic;
|
signal inboundRead : std_logic;
|
signal inboundControl : std_logic_vector(1 downto 0);
|
signal inboundType : std_logic_vector(1 downto 0);
|
signal inboundData : std_logic_vector(31 downto 0);
|
signal inboundData : std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
signal inboundSymbol : std_logic_vector(33 downto 0);
|
signal inboundSymbol : std_logic_vector(((2+32)*NUMBER_WORDS-1) downto 0);
|
|
|
begin
|
begin
|
|
|
linkInitialized_o <=
|
linkInitialized_o <=
|
'1' when ((linkInitializedRx = '1') and (linkInitializedTx = '1')) else '0';
|
'1' when ((linkInitializedRx = '1') and (linkInitializedTx = '1')) else '0';
|
| Line 359... |
Line 384... |
-- Serial layer modules.
|
-- Serial layer modules.
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
Transmitter: RioTransmitter
|
Transmitter: RioTransmitter
|
generic map(
|
generic map(
|
TIMEOUT_WIDTH=>TIMEOUT_WIDTH)
|
TIMEOUT_WIDTH=>TIMEOUT_WIDTH,
|
|
NUMBER_WORDS=>NUMBER_WORDS)
|
port map(
|
port map(
|
clk=>clk, areset_n=>areset_n,
|
clk=>clk, areset_n=>areset_n,
|
portLinkTimeout_i=>portLinkTimeout_i,
|
portLinkTimeout_i=>portLinkTimeout_i,
|
portEnable_i=>outputPortEnable_i,
|
portEnable_i=>outputPortEnable_i,
|
localAckIdWrite_i=>localAckIdWrite_i,
|
localAckIdWrite_i=>localAckIdWrite_i,
|
| Line 372... |
Line 398... |
outboundAckId_i=>outboundAckId_i,
|
outboundAckId_i=>outboundAckId_i,
|
outstandingAckId_o=>outstandingAckId_o,
|
outstandingAckId_o=>outstandingAckId_o,
|
outboundAckId_o=>outboundAckId_o,
|
outboundAckId_o=>outboundAckId_o,
|
portInitialized_i=>portInitialized_i,
|
portInitialized_i=>portInitialized_i,
|
txFull_i=>outboundFull, txWrite_o=>outboundWrite,
|
txFull_i=>outboundFull, txWrite_o=>outboundWrite,
|
txControl_o=>outboundControl, txData_o=>outboundData,
|
txType_o=>outboundType, txData_o=>outboundData,
|
txControlEmpty_i=>txControlReadEmpty, txControlSymbol_i=>txControlReadSymbol,
|
txControlEmpty_i=>txControlReadEmpty(0), txControlSymbol_i=>txControlReadSymbol,
|
txControlUpdate_o=>txControlRead,
|
txControlUpdate_o=>txControlRead(0),
|
rxControlEmpty_i=>rxControlReadEmpty, rxControlSymbol_i=>rxControlReadSymbol,
|
rxControlEmpty_i=>rxControlReadEmpty(0), rxControlSymbol_i=>rxControlReadSymbol,
|
rxControlUpdate_o=>rxControlRead,
|
rxControlUpdate_o=>rxControlRead(0),
|
linkInitialized_o=>linkInitializedTx,
|
linkInitialized_o=>linkInitializedTx,
|
linkInitialized_i=>linkInitializedRx, ackIdStatus_i=>ackIdStatus,
|
linkInitialized_i=>linkInitializedRx, ackIdStatus_i=>ackIdStatus,
|
readFrameEmpty_i=>readFrameEmpty_i, readFrame_o=>readFrame_o,
|
readFrameEmpty_i=>readFrameEmpty_i, readFrame_o=>readFrame_o,
|
readFrameRestart_o=>readFrameRestart_o, readFrameAborted_i=>readFrameAborted_i,
|
readFrameRestart_o=>readFrameRestart_o, readFrameAborted_i=>readFrameAborted_i,
|
readWindowEmpty_i=>readWindowEmpty_i,
|
readWindowEmpty_i=>readWindowEmpty_i,
|
readWindowReset_o=>readWindowReset_o, readWindowNext_o=>readWindowNext_o,
|
readWindowReset_o=>readWindowReset_o, readWindowNext_o=>readWindowNext_o,
|
readContentEmpty_i=>readContentEmpty_i, readContent_o=>readContent_o,
|
readContentEmpty_i=>readContentEmpty_i, readContent_o=>readContent_o,
|
readContentEnd_i=>readContentEnd_i, readContentData_i=>readContentData_i);
|
readContentEnd_i=>readContentEnd_i,
|
|
readContentWords_i=>readContentData_i(2+(32*NUMBER_WORDS-1) downto 1+(32*NUMBER_WORDS-1)),
|
|
readContentData_i=>readContentData_i(32*NUMBER_WORDS-1 downto 0));
|
|
|
|
SymbolFifo: for i in 0 to NUMBER_WORDS-1 generate
|
TxSymbolFifo: RioFifo1
|
TxSymbolFifo: RioFifo1
|
generic map(WIDTH=>13)
|
generic map(WIDTH=>13)
|
port map(
|
port map(
|
clk=>clk, areset_n=>areset_n,
|
clk=>clk, areset_n=>areset_n,
|
empty_o=>txControlReadEmpty, read_i=>txControlRead, data_o=>txControlReadSymbol,
|
empty_o=>txControlReadEmpty(i),
|
full_o=>open, write_i=>txControlWrite, data_i=>txControlWriteSymbol);
|
read_i=>txControlRead(i),
|
|
data_o=>txControlReadSymbol(12*(i+1) downto 12*i),
|
|
full_o=>open,
|
|
write_i=>txControlWrite(i),
|
|
data_i=>txControlWriteSymbol(12*(i+1) downto 12*i));
|
|
|
RxSymbolFifo: RioFifo1
|
RxSymbolFifo: RioFifo1
|
generic map(WIDTH=>13)
|
generic map(WIDTH=>13)
|
port map(
|
port map(
|
clk=>clk, areset_n=>areset_n,
|
clk=>clk, areset_n=>areset_n,
|
empty_o=>rxControlReadEmpty, read_i=>rxControlRead, data_o=>rxControlReadSymbol,
|
empty_o=>rxControlReadEmpty(i),
|
full_o=>open, write_i=>rxControlWrite, data_i=>rxControlWriteSymbol);
|
read_i=>rxControlRead(i),
|
|
data_o=>rxControlReadSymbol(12*(i+1) downto 12*i),
|
|
full_o=>open,
|
|
write_i=>rxControlWrite(i),
|
|
data_i=>rxControlWriteSymbol(12*(i+1) downto 12*i));
|
|
end generate;
|
|
|
Receiver: RioReceiver
|
Receiver: RioReceiver
|
|
generic map(NUMBER_WORDS=>NUMBER_WORDS)
|
port map(
|
port map(
|
clk=>clk, areset_n=>areset_n,
|
clk=>clk, areset_n=>areset_n,
|
portEnable_i=>inputPortEnable_i,
|
portEnable_i=>inputPortEnable_i,
|
localAckIdWrite_i=>localAckIdWrite_i,
|
localAckIdWrite_i=>localAckIdWrite_i,
|
inboundAckId_i=>inboundAckId_i,
|
inboundAckId_i=>inboundAckId_i,
|
inboundAckId_o=>inboundAckId_o,
|
inboundAckId_o=>inboundAckId_o,
|
portInitialized_i=>portInitialized_i,
|
portInitialized_i=>portInitialized_i,
|
rxEmpty_i=>inboundEmpty, rxRead_o=>inboundRead,
|
rxEmpty_i=>inboundEmpty, rxRead_o=>inboundRead,
|
rxControl_i=>inboundControl, rxData_i=>inboundData,
|
rxType_i=>inboundType, rxData_i=>inboundData,
|
txControlWrite_o=>txControlWrite, txControlSymbol_o=>txControlWriteSymbol,
|
txControlWrite_o=>txControlWrite, txControlSymbol_o=>txControlWriteSymbol,
|
rxControlWrite_o=>rxControlWrite, rxControlSymbol_o=>rxControlWriteSymbol,
|
rxControlWrite_o=>rxControlWrite, rxControlSymbol_o=>rxControlWriteSymbol,
|
ackIdStatus_o=>ackIdStatus,
|
ackIdStatus_o=>ackIdStatus,
|
linkInitialized_o=>linkInitializedRx,
|
linkInitialized_o=>linkInitializedRx,
|
writeFrameFull_i=>writeFrameFull_i,
|
writeFrameFull_i=>writeFrameFull_i,
|
writeFrame_o=>writeFrame_o, writeFrameAbort_o=>writeFrameAbort_o,
|
writeFrame_o=>writeFrame_o, writeFrameAbort_o=>writeFrameAbort_o,
|
writeContent_o=>writeContent_o, writeContentData_o=>writeContentData_o);
|
writeContent_o=>writeContent_o,
|
|
writeContentWords_o=>writeContentData_o(2+(32*NUMBER_WORDS-1) downto 1+(32*NUMBER_WORDS-1)),
|
|
writeContentData_o=>writeContentData_o(32*NUMBER_WORDS-1 downto 0));
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- PCS layer FIFO interface.
|
-- PCS layer FIFO interface.
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
outboundSymbol <= outboundControl & outboundData;
|
outboundSymbol <= outboundType & outboundData;
|
OutboundSymbolFifo: RioFifo1
|
OutboundSymbolFifo: RioFifo1
|
generic map(WIDTH=>34)
|
generic map(WIDTH=>2+32*NUMBER_WORDS)
|
port map(
|
port map(
|
clk=>clk, areset_n=>areset_n,
|
clk=>clk, areset_n=>areset_n,
|
empty_o=>outboundSymbolEmpty_o, read_i=>outboundSymbolRead_i, data_o=>outboundSymbol_o,
|
empty_o=>outboundSymbolEmpty_o, read_i=>outboundSymbolRead_i, data_o=>outboundSymbol_o,
|
full_o=>outboundFull, write_i=>outboundWrite, data_i=>outboundSymbol);
|
full_o=>outboundFull, write_i=>outboundWrite, data_i=>outboundSymbol);
|
|
|
inboundControl <= inboundSymbol(33 downto 32);
|
inboundType <= inboundSymbol(2+(32*NUMBER_WORDS-1) downto 1+(32*NUMBER_WORDS-1));
|
inboundData <= inboundSymbol(31 downto 0);
|
inboundData <= inboundSymbol(32*NUMBER_WORDS-1 downto 0);
|
InboundSymbolFifo: RioFifo1
|
InboundSymbolFifo: RioFifo1
|
generic map(WIDTH=>34)
|
generic map(WIDTH=>2+32*NUMBER_WORDS)
|
port map(
|
port map(
|
clk=>clk, areset_n=>areset_n,
|
clk=>clk, areset_n=>areset_n,
|
empty_o=>inboundEmpty, read_i=>inboundRead, data_o=>inboundSymbol,
|
empty_o=>inboundEmpty, read_i=>inboundRead, data_o=>inboundSymbol,
|
full_o=>inboundSymbolFull_o, write_i=>inboundSymbolWrite_i, data_i=>inboundSymbol_i);
|
full_o=>inboundSymbolFull_o, write_i=>inboundSymbolWrite_i, data_i=>inboundSymbol_i);
|
|
|
| Line 457... |
Line 498... |
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- Entity for RioTransmitter.
|
-- Entity for RioTransmitter.
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
entity RioTransmitter is
|
entity RioTransmitter is
|
generic(
|
generic(
|
TIMEOUT_WIDTH : natural);
|
TIMEOUT_WIDTH : natural;
|
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
port(
|
port(
|
-- System signals.
|
-- System signals.
|
clk : in std_logic;
|
clk : in std_logic;
|
areset_n : in std_logic;
|
areset_n : in std_logic;
|
|
|
| Line 479... |
Line 521... |
|
|
-- Port output interface.
|
-- Port output interface.
|
portInitialized_i : in std_logic;
|
portInitialized_i : in std_logic;
|
txFull_i : in std_logic;
|
txFull_i : in std_logic;
|
txWrite_o : out std_logic;
|
txWrite_o : out std_logic;
|
txControl_o : out std_logic_vector(1 downto 0);
|
txType_o : out std_logic_vector(2*NUMBER_WORDS-1 downto 0);
|
txData_o : out std_logic_vector(31 downto 0);
|
txData_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
|
-- Control symbols aimed to the transmitter.
|
-- Control symbols aimed to the transmitter.
|
txControlEmpty_i : in std_logic;
|
txControlEmpty_i : in std_logic;
|
txControlSymbol_i : in std_logic_vector(12 downto 0);
|
txControlSymbol_i : in std_logic_vector(12 downto 0);
|
txControlUpdate_o : out std_logic;
|
txControlUpdate_o : out std_logic;
|
| Line 508... |
Line 550... |
readWindowReset_o : out std_logic;
|
readWindowReset_o : out std_logic;
|
readWindowNext_o : out std_logic;
|
readWindowNext_o : out std_logic;
|
readContentEmpty_i : in std_logic;
|
readContentEmpty_i : in std_logic;
|
readContent_o : out std_logic;
|
readContent_o : out std_logic;
|
readContentEnd_i : in std_logic;
|
readContentEnd_i : in std_logic;
|
readContentData_i : in std_logic_vector(31 downto 0));
|
readContentWords_i : in std_logic_vector(1 downto 0);
|
|
readContentData_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
end entity;
|
end entity;
|
|
|
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- Architecture for RioTransmitter.
|
-- Architecture for RioTransmitter.
|
| Line 520... |
Line 563... |
architecture RioTransmitterImpl of RioTransmitter is
|
architecture RioTransmitterImpl of RioTransmitter is
|
|
|
constant NUMBER_STATUS_TRANSMIT : natural := 15;
|
constant NUMBER_STATUS_TRANSMIT : natural := 15;
|
constant NUMBER_LINK_RESPONSE_RETRIES : natural := 2;
|
constant NUMBER_LINK_RESPONSE_RETRIES : natural := 2;
|
|
|
|
component RioTransmitterCore is
|
|
generic(
|
|
TIMEOUT_WIDTH : natural;
|
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
|
port(
|
|
-- System signals.
|
|
clk : in std_logic;
|
|
areset_n : in std_logic;
|
|
|
|
-- Status signals used for maintenance.
|
|
portLinkTimeout_i : in std_logic_vector(TIMEOUT_WIDTH-1 downto 0);
|
|
portEnable_i : in std_logic;
|
|
|
|
-- Port output interface.
|
|
portInitialized_i : in std_logic;
|
|
txFull_i : in std_logic;
|
|
txWrite_o : out std_logic;
|
|
txType_o : out std_logic_vector(2*NUMBER_WORDS-1 downto 0);
|
|
txData_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
|
|
-- Control symbols aimed to the transmitter.
|
|
txControlEmpty_i : in std_logic;
|
|
txControlSymbol_i : in std_logic_vector(13*NUMBER_WORDS-1 downto 0);
|
|
txControlUpdate_o : out std_logic;
|
|
|
|
-- Control symbols from the receiver to send.
|
|
rxControlEmpty_i : in std_logic;
|
|
rxControlSymbol_i : in std_logic_vector(13*NUMBER_WORDS-1 downto 0);
|
|
rxControlUpdate_o : out std_logic;
|
|
|
|
-- Internal signalling from the receiver part.
|
|
linkInitialized_o : out std_logic;
|
|
linkInitialized_i : in std_logic;
|
|
ackIdStatus_i : in std_logic_vector(4 downto 0);
|
|
|
|
-- The current time used for timeout calculations.
|
|
timeCurrent_i : in std_logic_vector(TIMEOUT_WIDTH downto 0);
|
|
|
|
-- Internal core variables for cascading.
|
|
timeSentWrite_o : out std_logic;
|
|
timeSentWriteAddress_o : out std_logic_vector(4 downto 0);
|
|
timeSentWriteData_o : out std_logic_vector(TIMEOUT_WIDTH downto 0);
|
|
timeSentReadAddress_o : out std_logic_vector(4 downto 0);
|
|
timeSentReadData_i : in std_logic_vector(TIMEOUT_WIDTH downto 0);
|
|
operational_i : in std_logic;
|
|
operational_o : out std_logic;
|
|
ackId_i : in std_logic_vector(4 downto 0);
|
|
ackId_o : out std_logic_vector(4 downto 0);
|
|
bufferStatus_i : in std_logic_vector(4 downto 0);
|
|
bufferStatus_o : out std_logic_vector(4 downto 0);
|
|
statusReceived_i : in std_logic;
|
|
statusReceived_o : out std_logic;
|
|
numberSentLinkRequests_i : in std_logic_vector(1 downto 0);
|
|
numberSentLinkRequests_o : out std_logic_vector(1 downto 0);
|
|
outputErrorStopped_i : in std_logic;
|
|
outputErrorStopped_o : out std_logic;
|
|
recoverActive_i : in std_logic;
|
|
recoverActive_o : out std_logic;
|
|
recoverCounter_i : in std_logic_vector(4 downto 0);
|
|
recoverCounter_o : out std_logic_vector(4 downto 0);
|
|
ackIdWindow_i : in std_logic_vector(4 downto 0);
|
|
ackIdWindow_o : out std_logic_vector(4 downto 0);
|
|
frameState_i : in std_logic_vector(4 downto 0);
|
|
frameState_o : out std_logic_vector(4 downto 0);
|
|
frameWordCounter_i : in std_logic_vector(1 downto 0);
|
|
frameWordCounter_o : out std_logic_vector(1 downto 0);
|
|
frameContent_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
frameContent_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
counter_i : in std_logic_vector(3 downto 0);
|
|
counter_o : out std_logic_vector(3 downto 0);
|
|
symbolsTransmitted_i : in std_logic_vector(7 downto 0);
|
|
symbolsTransmitted_o : out std_logic_vector(7 downto 0);
|
|
|
|
-- Frame buffer interface.
|
|
readFrameEmpty_i : in std_logic;
|
|
readFrame_o : out std_logic;
|
|
readFrameRestart_o : out std_logic;
|
|
readFrameAborted_i : in std_logic;
|
|
readWindowEmpty_i : in std_logic;
|
|
readWindowReset_o : out std_logic;
|
|
readWindowNext_o : out std_logic;
|
|
readContentEmpty_i : in std_logic;
|
|
readContent_o : out std_logic;
|
|
readContentEnd_i : in std_logic;
|
|
readContentWords_i : in std_logic_vector(1 downto 0);
|
|
readContentData_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
|
end component;
|
|
|
component MemorySimpleDualPortAsync is
|
component MemorySimpleDualPortAsync is
|
generic(
|
generic(
|
ADDRESS_WIDTH : natural := 1;
|
ADDRESS_WIDTH : natural := 1;
|
DATA_WIDTH : natural := 1;
|
DATA_WIDTH : natural := 1;
|
INIT_VALUE : std_logic := 'U');
|
INIT_VALUE : std_logic := 'U');
|
| Line 535... |
Line 666... |
|
|
addressB_i : in std_logic_vector(ADDRESS_WIDTH-1 downto 0);
|
addressB_i : in std_logic_vector(ADDRESS_WIDTH-1 downto 0);
|
dataB_o : out std_logic_vector(DATA_WIDTH-1 downto 0));
|
dataB_o : out std_logic_vector(DATA_WIDTH-1 downto 0));
|
end component;
|
end component;
|
|
|
component Crc5ITU is
|
signal timeCurrent : std_logic_vector(TIMEOUT_WIDTH downto 0);
|
port(
|
signal timeSentWrite : std_logic;
|
d_i : in std_logic_vector(18 downto 0);
|
signal timeSentWriteAddress : std_logic_vector(4 downto 0);
|
crc_o : out std_logic_vector(4 downto 0));
|
signal timeSentWriteData : std_logic_vector(TIMEOUT_WIDTH downto 0);
|
end component;
|
signal timeSentReadAddress : std_logic_vector(4 downto 0);
|
|
signal timeSentReadData : std_logic_vector(TIMEOUT_WIDTH downto 0);
|
type StateType is (STATE_UNINITIALIZED, STATE_PORT_INITIALIZED,
|
|
STATE_NORMAL,
|
|
STATE_OUTPUT_RETRY_STOPPED,
|
|
STATE_SEND_LINK_REQUEST, STATE_OUTPUT_ERROR_STOPPED,
|
|
STATE_RECOVER, STATE_FATAL_ERROR);
|
|
signal stateCurrent, stateNext : StateType;
|
|
|
|
signal statusReceivedCurrent, statusReceivedNext : std_logic;
|
signal operationalCurrent, operationalNext : std_logic;
|
signal counterCurrent, counterNext : natural range 0 to 15;
|
signal ackIdCurrent, ackIdNext : std_logic_vector(4 downto 0);
|
signal symbolsTransmittedCurrent, symbolsTransmittedNext : natural range 0 to 255;
|
|
|
|
type FrameStateType is (FRAME_START, FRAME_CHECK, FRAME_ACKID, FRAME_BODY, FRAME_END);
|
|
signal frameStateCurrent, frameStateNext : FrameStateType;
|
|
signal ackIdCurrent, ackIdNext : unsigned(4 downto 0) := (others=>'0');
|
|
signal ackIdWindowCurrent, ackIdWindowNext : unsigned(4 downto 0) := (others=>'0');
|
|
signal bufferStatusCurrent, bufferStatusNext : std_logic_vector(4 downto 0);
|
signal bufferStatusCurrent, bufferStatusNext : std_logic_vector(4 downto 0);
|
|
signal statusReceivedCurrent, statusReceivedNext : std_logic;
|
signal stype0 : std_logic_vector(2 downto 0);
|
signal numberSentLinkRequestsCurrent, numberSentLinkRequestsNext : std_logic_vector(1 downto 0);
|
signal parameter0 : std_logic_vector(4 downto 0);
|
signal outputErrorStoppedCurrent, outputErrorStoppedNext : std_logic;
|
signal parameter1 : std_logic_vector(4 downto 0);
|
signal recoverActiveCurrent, recoverActiveNext : std_logic;
|
signal stype1 : std_logic_vector(2 downto 0);
|
signal recoverCounterCurrent, recoverCounterNext : std_logic_vector(4 downto 0);
|
signal cmd : std_logic_vector(2 downto 0);
|
signal ackIdWindowCurrent, ackIdWindowNext : std_logic_vector(4 downto 0);
|
|
signal frameStateCurrent, frameStateNext : std_logic_vector(4 downto 0);
|
signal txControlStype0 : std_logic_vector(2 downto 0);
|
signal frameWordCounterCurrent, frameWordCounterNext : std_logic_vector(1 downto 0);
|
signal txControlParameter0 : std_logic_vector(4 downto 0);
|
signal frameContentCurrent, frameContentNext : std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
signal txControlParameter1 : std_logic_vector(4 downto 0);
|
signal counterCurrent, counterNext : std_logic_vector(3 downto 0);
|
|
signal symbolsTransmittedCurrent, symbolsTransmittedNext : std_logic_vector(7 downto 0);
|
signal rxControlStype0 : std_logic_vector(2 downto 0);
|
|
signal rxControlParameter0 : std_logic_vector(4 downto 0);
|
|
signal rxControlParameter1 : std_logic_vector(4 downto 0);
|
|
|
|
signal symbolWrite : std_logic;
|
|
signal symbolType : std_logic_vector(1 downto 0);
|
|
signal symbolControl : std_logic_vector(31 downto 0);
|
|
signal symbolData : std_logic_vector(31 downto 0);
|
|
signal crcCalculated : std_logic_vector(4 downto 0);
|
|
|
|
signal timeoutWrite : std_logic;
|
|
signal timeoutCounter : unsigned(TIMEOUT_WIDTH downto 0);
|
|
signal timeoutFrame : unsigned(TIMEOUT_WIDTH downto 0);
|
|
signal timeoutElapsed : unsigned(TIMEOUT_WIDTH downto 0);
|
|
signal timeoutDelta : unsigned(TIMEOUT_WIDTH downto 0);
|
|
signal timeoutExpired : std_logic;
|
|
|
|
signal timeoutAddress : std_logic_vector(4 downto 0);
|
|
signal timeoutMemoryOut : std_logic_vector(TIMEOUT_WIDTH downto 0);
|
|
|
|
begin
|
begin
|
|
|
linkInitialized_o <= '0' when ((stateCurrent = STATE_UNINITIALIZED) or
|
|
(stateCurrent = STATE_PORT_INITIALIZED)) else '1';
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- Assign control symbol from fifo signals.
|
|
-----------------------------------------------------------------------------
|
|
|
|
txControlStype0 <= txControlSymbol_i(12 downto 10);
|
|
txControlParameter0 <= txControlSymbol_i(9 downto 5);
|
|
txControlParameter1 <= txControlSymbol_i(4 downto 0);
|
|
|
|
rxControlStype0 <= rxControlSymbol_i(12 downto 10);
|
|
rxControlParameter0 <= rxControlSymbol_i(9 downto 5);
|
|
rxControlParameter1 <= rxControlSymbol_i(4 downto 0);
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- Outbound symbol creation logic.
|
|
-----------------------------------------------------------------------------
|
|
|
|
symbolControl(31 downto 29) <= stype0;
|
|
symbolControl(28 downto 24) <= parameter0;
|
|
symbolControl(23 downto 19) <= parameter1;
|
|
symbolControl(18 downto 16) <= stype1;
|
|
symbolControl(15 downto 13) <= cmd;
|
|
symbolControl(12 downto 8) <= crcCalculated;
|
|
symbolControl(7 downto 0) <= x"00";
|
|
|
|
Crc5Calculator: Crc5ITU
|
|
port map(
|
|
d_i=>symbolControl(31 downto 13), crc_o=>crcCalculated);
|
|
|
|
txWrite_o <= symbolWrite;
|
|
txControl_o <= symbolType;
|
|
txData_o <= symbolControl when (symbolType = SYMBOL_CONTROL) else symbolData;
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- Packet timeout logic.
|
|
-----------------------------------------------------------------------------
|
|
|
|
-- Note that the timer is one bit larger to be able to detect a timeout on a
|
|
-- free-running counter.
|
|
process(areset_n, clk)
|
process(areset_n, clk)
|
begin
|
begin
|
if (areset_n = '0') then
|
if (areset_n = '0') then
|
timeoutCounter <= (others=>'0');
|
timeCurrent <= (others=>'0');
|
elsif (clk'event and clk = '1') then
|
elsif (clk'event and clk = '1') then
|
timeoutCounter <= timeoutCounter + 1;
|
timeCurrent <= std_logic_vector(unsigned(timeCurrent) + 1);
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
timeoutElapsed <= timeoutCounter - timeoutFrame;
|
|
timeoutDelta <= unsigned('0' & portLinkTimeout_i) - timeoutElapsed;
|
|
timeoutExpired <= timeoutDelta(TIMEOUT_WIDTH);
|
|
|
|
timeoutFrame <= unsigned(timeoutMemoryOut);
|
|
TimeoutMemory: MemorySimpleDualPortAsync
|
TimeoutMemory: MemorySimpleDualPortAsync
|
generic map(ADDRESS_WIDTH=>5, DATA_WIDTH=>TIMEOUT_WIDTH+1, INIT_VALUE=>'0')
|
generic map(ADDRESS_WIDTH=>5, DATA_WIDTH=>TIMEOUT_WIDTH+1, INIT_VALUE=>'0')
|
port map(
|
port map(
|
clkA_i=>clk, enableA_i=>timeoutWrite,
|
clkA_i=>clk, enableA_i=>timeSentWrite,
|
addressA_i=>timeoutAddress, dataA_i=>std_logic_vector(timeoutCounter),
|
addressA_i=>timeSentWriteAddress, dataA_i=>timeSentWriteData,
|
addressB_i=>std_logic_vector(ackIdCurrent), dataB_o=>timeoutMemoryOut);
|
addressB_i=>timeSentReadAddress, dataB_o=>timeSentReadData);
|
|
|
-----------------------------------------------------------------------------
|
|
-- Main outbound symbol handler, synchronous part.
|
|
-----------------------------------------------------------------------------
|
|
process(areset_n, clk)
|
process(areset_n, clk)
|
begin
|
begin
|
if (areset_n = '0') then
|
if (areset_n = '0') then
|
stateCurrent <= STATE_UNINITIALIZED;
|
operationalCurrent <= '0';
|
|
|
statusReceivedCurrent <= '0';
|
|
counterCurrent <= 0;
|
|
symbolsTransmittedCurrent <= 0;
|
|
|
|
frameStateCurrent <= FRAME_START;
|
|
ackIdCurrent <= (others => '0');
|
ackIdCurrent <= (others => '0');
|
ackIdWindowCurrent <= (others => '0');
|
|
bufferStatusCurrent <= (others => '0');
|
bufferStatusCurrent <= (others => '0');
|
|
statusReceivedCurrent <= '0';
|
|
numberSentLinkRequestsCurrent <= (others=>'0');
|
|
outputErrorStoppedCurrent <= '0';
|
|
recoverActiveCurrent <= '0';
|
|
recoverCounterCurrent <= (others=>'0');
|
|
ackIdWindowCurrent <= (others=>'0');
|
|
frameStateCurrent <= (others=>'0');
|
|
frameWordCounterCurrent <= (others=>'0');
|
|
frameContentCurrent <= (others=>'0');
|
|
counterCurrent <= (others=>'0');
|
|
symbolsTransmittedCurrent <= (others=>'0');
|
elsif (clk'event and clk = '1') then
|
elsif (clk'event and clk = '1') then
|
stateCurrent <= stateNext;
|
operationalCurrent <= operationalNext;
|
|
ackIdCurrent <= ackIdNext;
|
|
bufferStatusCurrent <= bufferStatusNext;
|
statusReceivedCurrent <= statusReceivedNext;
|
statusReceivedCurrent <= statusReceivedNext;
|
|
numberSentLinkRequestsCurrent <= numberSentLinkRequestsNext;
|
|
outputErrorStoppedCurrent <= outputErrorStoppedNext;
|
|
recoverActiveCurrent <= recoverActiveNext;
|
|
recoverCounterCurrent <= recoverCounterNext;
|
|
ackIdWindowCurrent <= ackIdWindowNext;
|
|
frameStateCurrent <= frameStateNext;
|
|
frameWordCounterCurrent <= frameWordCounterNext;
|
|
frameContentCurrent <= frameContentNext;
|
counterCurrent <= counterNext;
|
counterCurrent <= counterNext;
|
symbolsTransmittedCurrent <= symbolsTransmittedNext;
|
symbolsTransmittedCurrent <= symbolsTransmittedNext;
|
|
|
frameStateCurrent <= frameStateNext;
|
|
ackIdCurrent <= ackIdNext;
|
|
ackIdWindowCurrent <= ackIdWindowNext;
|
|
bufferStatusCurrent <= bufferStatusNext;
|
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
-----------------------------------------------------------------------------
|
TxCore: RioTransmitterCore
|
-- Main outbound symbol handler, combinatorial part.
|
generic map(TIMEOUT_WIDTH=>TIMEOUT_WIDTH,
|
-----------------------------------------------------------------------------
|
NUMBER_WORDS=>NUMBER_WORDS)
|
process(stateCurrent,
|
port map(
|
statusReceivedCurrent, counterCurrent,
|
clk=>clk, areset_n=>areset_n,
|
symbolsTransmittedCurrent,
|
portLinkTimeout_i=>portLinkTimeout_i, portEnable_i=>portEnable_i,
|
frameStateCurrent, ackIdCurrent, ackIdWindowCurrent, bufferStatusCurrent,
|
portInitialized_i=>portInitialized_i,
|
txControlStype0, txControlParameter0, txControlParameter1,
|
txFull_i=>txFull_i, txWrite_o=>txWrite_o, txType_o=>txType_o, txData_o=>txData_o,
|
rxControlStype0, rxControlParameter0, rxControlParameter1,
|
txControlEmpty_i=>txControlEmpty_i,
|
portEnable_i,
|
txControlSymbol_i=>txControlSymbol_i,
|
localAckIdWrite_i, clrOutstandingAckId_i,
|
txControlUpdate_o=>txControlUpdate_o,
|
outstandingAckId_i, outboundAckId_i,
|
rxControlEmpty_i=>rxControlEmpty_i,
|
txFull_i,
|
rxControlSymbol_i=>rxControlSymbol_i,
|
txControlEmpty_i, txControlSymbol_i,
|
rxControlUpdate_o=>rxControlUpdate_o,
|
rxControlEmpty_i, rxControlSymbol_i,
|
linkInitialized_o=>linkInitialized_o,
|
portInitialized_i, linkInitialized_i, ackIdStatus_i,
|
linkInitialized_i=>linkInitialized_i,
|
readFrameEmpty_i, readFrameAborted_i,
|
ackIdStatus_i=>ackIdStatus_i,
|
readWindowEmpty_i,
|
|
readContentEmpty_i, readContentEnd_i, readContentData_i,
|
timeCurrent_i=>timeCurrent,
|
timeoutExpired)
|
timeSentWrite_o=>timeSentWrite,
|
begin
|
timeSentWriteAddress_o=>timeSentWriteAddress,
|
stateNext <= stateCurrent;
|
timeSentWriteData_o=>timeSentWriteData,
|
statusReceivedNext <= statusReceivedCurrent;
|
timeSentReadAddress_o=>timeSentReadAddress,
|
counterNext <= counterCurrent;
|
timeSentReadData_i=>timeSentReadData,
|
symbolsTransmittedNext <= symbolsTransmittedCurrent;
|
|
|
operational_i=>operationalCurrent, operational_o=>operationalNext,
|
frameStateNext <= frameStateCurrent;
|
ackId_i=>ackIdCurrent, ackId_o=>ackIdNext,
|
ackIdNext <= ackIdCurrent;
|
bufferStatus_i=>bufferStatusCurrent, bufferStatus_o=>bufferStatusNext,
|
ackIdWindowNext <= ackIdWindowCurrent;
|
statusReceived_i=>statusReceivedCurrent, statusReceived_o=>statusReceivedNext,
|
bufferStatusNext <= bufferStatusCurrent;
|
numberSentLinkRequests_i=>numberSentLinkRequestsCurrent, numberSentLinkRequests_o=>numberSentLinkRequestsNext,
|
|
outputErrorStopped_i=>outputErrorStoppedCurrent, outputErrorStopped_o=>outputErrorStoppedNext,
|
|
recoverActive_i=>recoverActiveCurrent, recoverActive_o=>recoverActiveNext,
|
|
recoverCounter_i=>recoverCounterCurrent, recoverCounter_o=>recoverCounterNext,
|
|
ackIdWindow_i=>ackIdWindowCurrent, ackIdWindow_o=>ackIdWindowNext,
|
|
frameState_i=>frameStateCurrent, frameState_o=>frameStateNext,
|
|
frameWordCounter_i=>frameWordCounterCurrent, frameWordCounter_o=>frameWordCounterNext,
|
|
frameContent_i=>frameContentCurrent, frameContent_o=>frameContentNext,
|
|
counter_i=>counterCurrent, counter_o=>counterNext,
|
|
symbolsTransmitted_i=>symbolsTransmittedCurrent, symbolsTransmitted_o=>symbolsTransmittedNext,
|
|
|
|
readFrameEmpty_i=>readFrameEmpty_i,
|
|
readFrame_o=>readFrame_o,
|
|
readFrameRestart_o=>readFrameRestart_o,
|
|
readFrameAborted_i=>readFrameAborted_i,
|
|
readWindowEmpty_i=>readWindowEmpty_i,
|
|
readWindowReset_o=>readWindowReset_o,
|
|
readWindowNext_o=>readWindowNext_o,
|
|
readContentEmpty_i=>readContentEmpty_i,
|
|
readContent_o=>readContent_o,
|
|
readContentEnd_i=>readContentEnd_i,
|
|
readContentWords_i=>readContentWords_i,
|
|
readContentData_i=>readContentData_i);
|
|
|
txControlUpdate_o <= '0';
|
end architecture;
|
rxControlUpdate_o <= '0';
|
|
|
|
readFrame_o <= '0';
|
|
readFrameRestart_o <= '0';
|
|
readWindowReset_o <= '0';
|
|
readWindowNext_o <= '0';
|
|
readContent_o <= '0';
|
|
|
|
symbolWrite <= '0';
|
|
symbolType <= (others=>'U');
|
|
stype0 <= (others=>'U');
|
|
parameter0 <= (others=>'U');
|
|
parameter1 <= (others=>'U');
|
|
stype1 <= (others=>'U');
|
|
cmd <= (others=>'U');
|
|
symbolData <= (others=>'U');
|
|
|
|
timeoutWrite <= '0';
|
|
timeoutAddress <= (others=>'U');
|
|
|
|
outstandingAckId_o <= std_logic_vector(ackIdCurrent);
|
|
outboundAckId_o <= std_logic_vector(ackIdWindowCurrent);
|
|
|
|
-- Check if a localAckIdWrite is active.
|
|
if (localAckIdWrite_i = '1') then
|
|
-- A localAckIdWrite is active.
|
|
|
|
-- Check if all outstanding packets should be discarded.
|
|
if (clrOutstandingAckId_i = '1') then
|
|
-- Delete all outbound packets.
|
|
-- REMARK: Remove all packets in another way... what if uninitialized???
|
|
stateNext <= STATE_RECOVER;
|
|
end if;
|
|
|
|
-- Set ackIds.
|
|
ackIdNext <= unsigned(outstandingAckId_i);
|
|
ackIdWindowNext <= unsigned(outboundAckId_i);
|
|
else
|
|
-- A localAckIdWrite is not active.
|
|
|
|
-- Act on the current state.
|
-------------------------------------------------------------------------------
|
case (stateCurrent) is
|
-- RioTransmitterCore
|
|
-------------------------------------------------------------------------------
|
|
library ieee;
|
|
use ieee.std_logic_1164.all;
|
|
use ieee.numeric_std.all;
|
|
use work.rio_common.all;
|
|
use work.rio_serial_common.all;
|
|
|
when STATE_UNINITIALIZED =>
|
-------------------------------------------------------------------------------
|
-----------------------------------------------------------------------
|
-- Entity for RioTransmitterCore.
|
-- This state is entered at startup. A port that is not initialized
|
-------------------------------------------------------------------------------
|
-- should only transmit idle sequences.
|
entity RioTransmitterCore is
|
-----------------------------------------------------------------------
|
generic(
|
|
TIMEOUT_WIDTH : natural;
|
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
|
port(
|
|
-- System signals.
|
|
clk : in std_logic;
|
|
areset_n : in std_logic;
|
|
|
-- Check if the port is initialized.
|
-- Status signals used for maintenance.
|
if (portInitialized_i = '0') then
|
portLinkTimeout_i : in std_logic_vector(TIMEOUT_WIDTH-1 downto 0);
|
-- Port not initialized.
|
portEnable_i : in std_logic;
|
|
|
-- Check if any new symbols from the link partner has been received.
|
-- Port output interface.
|
if (txControlEmpty_i = '0') then
|
portInitialized_i : in std_logic;
|
-- New symbols have been received.
|
txFull_i : in std_logic;
|
-- Discard all new symbols in this state.
|
txWrite_o : out std_logic;
|
txControlUpdate_o <= '1';
|
txType_o : out std_logic_vector(2*NUMBER_WORDS-1 downto 0);
|
else
|
txData_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
-- No new symbols from the link partner.
|
|
-- Dont do anything.
|
|
end if;
|
|
|
|
-- Check if any new symbols should be transmitted to the link partner.
|
-- Control symbols aimed to the transmitter.
|
if (rxControlEmpty_i = '0') then
|
txControlEmpty_i : in std_logic;
|
-- New symbols should be transmitted.
|
txControlSymbol_i : in std_logic_vector(13*NUMBER_WORDS-1 downto 0);
|
-- Do not forward any symbols in this state.
|
txControlUpdate_o : out std_logic;
|
rxControlUpdate_o <= '1';
|
|
else
|
|
-- No new symbols to transmit.
|
|
-- Dont do anything.
|
|
end if;
|
|
|
|
-- Check if a new symbol should be transmitted.
|
-- Control symbols from the receiver to send.
|
if (txFull_i = '0') then
|
rxControlEmpty_i : in std_logic;
|
-- A new symbol should be transmitted.
|
rxControlSymbol_i : in std_logic_vector(13*NUMBER_WORDS-1 downto 0);
|
|
rxControlUpdate_o : out std_logic;
|
|
|
-- Send idle sequence.
|
-- Internal signalling from the receiver part.
|
symbolWrite <= '1';
|
linkInitialized_o : out std_logic;
|
symbolType <= SYMBOL_IDLE;
|
linkInitialized_i : in std_logic;
|
else
|
ackIdStatus_i : in std_logic_vector(4 downto 0);
|
-- The outbound fifo is full.
|
|
-- Dont do anything.
|
|
end if;
|
|
|
|
-- Check if a new full packet is ready.
|
-- The current time used for timeout calculations.
|
if (readFrameEmpty_i = '0') then
|
timeCurrent_i : in std_logic_vector(TIMEOUT_WIDTH downto 0);
|
-- A new full packet is ready.
|
|
-- It is not possible to send the packet now. If the packet is not
|
|
-- discarded it might congest the full system if the link does not
|
|
-- go initialized. To avoid a congested switch, the packet is
|
|
-- discarded and will have to be resent by the source when the link
|
|
-- is up and running.
|
|
readFrame_o <= '1';
|
|
else
|
|
-- No new full packets are ready.
|
|
-- Dont do anything.
|
|
end if;
|
|
else
|
|
-- Port is initialized.
|
|
|
|
-- Go to the initialized state and reset the counters.
|
-- Internal core variables for cascading.
|
statusReceivedNext <= '0';
|
timeSentWrite_o : out std_logic;
|
counterNext <= NUMBER_STATUS_TRANSMIT;
|
timeSentWriteAddress_o : out std_logic_vector(4 downto 0);
|
symbolsTransmittedNext <= 0;
|
timeSentWriteData_o : out std_logic_vector(TIMEOUT_WIDTH downto 0);
|
stateNext <= STATE_PORT_INITIALIZED;
|
timeSentReadAddress_o : out std_logic_vector(4 downto 0);
|
end if;
|
timeSentReadData_i : in std_logic_vector(TIMEOUT_WIDTH downto 0);
|
|
|
|
operational_i : in std_logic;
|
|
operational_o : out std_logic;
|
|
ackId_i : in std_logic_vector(4 downto 0);
|
|
ackId_o : out std_logic_vector(4 downto 0);
|
|
bufferStatus_i : in std_logic_vector(4 downto 0);
|
|
bufferStatus_o : out std_logic_vector(4 downto 0);
|
|
statusReceived_i : in std_logic;
|
|
statusReceived_o : out std_logic;
|
|
numberSentLinkRequests_i : in std_logic_vector(1 downto 0);
|
|
numberSentLinkRequests_o : out std_logic_vector(1 downto 0);
|
|
outputErrorStopped_i : in std_logic;
|
|
outputErrorStopped_o : out std_logic;
|
|
recoverActive_i : in std_logic;
|
|
recoverActive_o : out std_logic;
|
|
recoverCounter_i : in std_logic_vector(4 downto 0);
|
|
recoverCounter_o : out std_logic_vector(4 downto 0);
|
|
ackIdWindow_i : in std_logic_vector(4 downto 0);
|
|
ackIdWindow_o : out std_logic_vector(4 downto 0);
|
|
frameState_i : in std_logic_vector(4 downto 0);
|
|
frameState_o : out std_logic_vector(4 downto 0);
|
|
frameWordCounter_i : in std_logic_vector(1 downto 0);
|
|
frameWordCounter_o : out std_logic_vector(1 downto 0);
|
|
frameContent_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
frameContent_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
counter_i : in std_logic_vector(3 downto 0);
|
|
counter_o : out std_logic_vector(3 downto 0);
|
|
symbolsTransmitted_i : in std_logic_vector(7 downto 0);
|
|
symbolsTransmitted_o : out std_logic_vector(7 downto 0);
|
|
|
when STATE_PORT_INITIALIZED =>
|
-- Frame buffer interface.
|
-----------------------------------------------------------------------
|
readFrameEmpty_i : in std_logic;
|
-- The specification requires a status control symbol being sent at
|
readFrame_o : out std_logic;
|
-- least every 1024 code word until an error-free status has been
|
readFrameRestart_o : out std_logic;
|
-- received. This implies that at most 256 idle sequences should be
|
readFrameAborted_i : in std_logic;
|
-- sent in between status control symbols. Once an error-free status has
|
readWindowEmpty_i : in std_logic;
|
-- been received, status symbols may be sent more rapidly. At least 15
|
readWindowReset_o : out std_logic;
|
-- statuses has to be transmitted once an error-free status has been
|
readWindowNext_o : out std_logic;
|
-- received.
|
readContentEmpty_i : in std_logic;
|
---------------------------------------------------------------------
|
readContent_o : out std_logic;
|
|
readContentEnd_i : in std_logic;
|
|
readContentWords_i : in std_logic_vector(1 downto 0);
|
|
readContentData_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
|
end entity;
|
|
|
-- Check if the port is initialized.
|
|
if (portInitialized_i = '1') then
|
|
-- Port is initialized.
|
|
|
|
-- Check if we are ready to change state to linkInitialized.
|
-------------------------------------------------------------------------------
|
if ((linkInitialized_i = '1') and (counterCurrent = 0)) then
|
-- Architecture for RioTransmitterCore.
|
-- Receiver has received enough error free status symbols and we have
|
-------------------------------------------------------------------------------
|
-- transmitted enough.
|
architecture RioTransmitterCoreImpl of RioTransmitterCore is
|
|
|
-- Initialize framing before entering the normal state.
|
|
ackIdWindowNext <= ackIdCurrent;
|
|
frameStateNext <= FRAME_START;
|
|
readWindowReset_o <= '1';
|
|
|
|
-- Considder the link initialized.
|
constant NUMBER_STATUS_TRANSMIT : std_logic_vector := "1111";
|
stateNext <= STATE_NORMAL;
|
constant NUMBER_LINK_RESPONSE_RETRIES : std_logic_vector := "10";
|
else
|
|
-- Not ready to change state to linkInitialized.
|
|
-- Dont do anything.
|
|
end if;
|
|
|
|
-- Check if any new symbols from the link partner has been received.
|
-- REMARK: Binary coding???
|
if (txControlEmpty_i = '0') then
|
constant FRAME_START : std_logic_vector(4 downto 0) := "00001";
|
-- New symbols have been received.
|
constant FRAME_CHECK : std_logic_vector(4 downto 0) := "00010";
|
|
constant FRAME_ACKID : std_logic_vector(4 downto 0) := "00100";
|
|
constant FRAME_BODY : std_logic_vector(4 downto 0) := "01000";
|
|
constant FRAME_END : std_logic_vector(4 downto 0) := "10000";
|
|
|
-- Check if the new symbol is a status.
|
component Crc5ITU is
|
if (txControlStype0 = STYPE0_STATUS) then
|
port(
|
-- A new status control symbol has been received.
|
d_i : in std_logic_vector(18 downto 0);
|
statusReceivedNext <= '1';
|
crc_o : out std_logic_vector(4 downto 0));
|
|
end component;
|
|
|
-- Set the ackId and the linkpartner buffer status to what is indicated
|
signal timeSentUpdate : std_logic;
|
-- in the received control symbol.
|
signal timeElapsed : unsigned(TIMEOUT_WIDTH downto 0);
|
ackIdNext <= unsigned(txControlParameter0);
|
signal timeDelta : unsigned(TIMEOUT_WIDTH downto 0);
|
bufferStatusNext <= txControlParameter1;
|
signal timeExpired : std_logic;
|
else
|
|
-- Did not receive a status control symbol.
|
signal sendRestartFromRetry, sendRestartFromRetryOut : std_logic;
|
-- Discard it.
|
signal sendLinkRequest, sendLinkRequestOut : std_logic;
|
end if;
|
|
|
signal symbolControlRestartOut, symbolControlRestart : std_logic;
|
|
signal symbolControlLinkRequestOut, symbolControlLinkRequest : std_logic;
|
|
signal symbolControlStartOut, symbolControlStart : std_logic;
|
|
signal symbolControlEndOut, symbolControlEnd : std_logic;
|
|
signal symbolDataOut, symbolData : std_logic;
|
|
signal symbolDataContentOut, symbolDataContent : std_logic_vector(31 downto 0);
|
|
|
|
signal symbolControlStype1 : std_logic;
|
|
signal controlValidOut, controlValid : std_logic;
|
|
signal stype0Out, stype0 : std_logic_vector(2 downto 0);
|
|
signal parameter0Out, parameter0 : std_logic_vector(4 downto 0);
|
|
signal parameter1Out, parameter1 : std_logic_vector(4 downto 0);
|
|
signal stype1 : std_logic_vector(2 downto 0);
|
|
signal cmd : std_logic_vector(2 downto 0);
|
|
signal dataValid : std_logic;
|
|
signal dataContent : std_logic_vector(31 downto 0);
|
|
|
-- Update to the next control symbol received by the receiver.
|
signal controlContent : std_logic_vector(31 downto 0);
|
txControlUpdate_o <= '1';
|
signal crc5 : std_logic_vector(4 downto 0);
|
else
|
|
-- No new symbols from the link partner.
|
|
-- Dont do anything.
|
|
end if;
|
|
|
|
-- Check if any new symbols should be transmitted to the link partner.
|
signal txControlStype0 : std_logic_vector(2 downto 0);
|
if (rxControlEmpty_i = '0') then
|
signal txControlParameter0 : std_logic_vector(4 downto 0);
|
-- New symbols should be transmitted.
|
signal txControlParameter1 : std_logic_vector(4 downto 0);
|
-- Do not forward any symbols in this state.
|
|
rxControlUpdate_o <= '1';
|
|
else
|
|
-- No new symbols to transmit.
|
|
-- Dont do anything.
|
|
end if;
|
|
|
|
-- Check if a new symbol may be transmitted.
|
signal rxControlStype0 : std_logic_vector(2 downto 0);
|
if (txFull_i = '0') then
|
signal rxControlParameter0 : std_logic_vector(4 downto 0);
|
-- A new symbol can be transmitted.
|
signal rxControlParameter1 : std_logic_vector(4 downto 0);
|
|
|
-- Check if idle sequence or a status symbol should be transmitted.
|
begin
|
if (((statusReceivedCurrent = '0') and (symbolsTransmittedCurrent = 255)) or
|
|
((statusReceivedCurrent = '1') and (symbolsTransmittedCurrent > 15))) then
|
|
-- A status symbol should be transmitted.
|
|
|
|
-- Send a status control symbol to the link partner.
|
linkInitialized_o <= operational_i;
|
symbolWrite <= '1';
|
|
symbolType <= SYMBOL_CONTROL;
|
|
stype0 <= STYPE0_STATUS;
|
|
parameter0 <= ackIdStatus_i;
|
|
parameter1 <= "11111";
|
|
stype1 <= STYPE1_NOP;
|
|
cmd <= "000";
|
|
|
|
-- Reset idle sequence transmission counter.
|
-----------------------------------------------------------------------------
|
symbolsTransmittedNext <= 0;
|
-- N-3
|
|
-- Receive stuff from link-partner and timeout supervision.
|
|
-- Input: ackId, ackIdWindow, timeoutExpired
|
|
-- Output: sendLinkRequest, sendRestartFromRetry, ackId,
|
|
-----------------------------------------------------------------------------
|
|
|
-- Check if the number of transmitted statuses should be updated.
|
timeSentReadAddress_o <= ackId_i;
|
if (statusReceivedCurrent = '1') and (counterCurrent /= 0) then
|
timeElapsed <= unsigned(timeCurrent_i) - unsigned(timeSentReadData_i);
|
counterNext <= counterCurrent - 1;
|
timeDelta <= unsigned('0' & portLinkTimeout_i) - timeElapsed;
|
end if;
|
timeExpired <= timeDelta(TIMEOUT_WIDTH);
|
else
|
|
-- A idle sequence should be transmitted.
|
|
symbolWrite <= '1';
|
|
symbolType <= SYMBOL_IDLE;
|
|
|
|
-- Increment the idle sequence transmission counter.
|
process(clk, areset_n)
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
begin
|
end if;
|
if (areset_n = '0') then
|
else
|
sendRestartFromRetry <= '0';
|
-- Cannot send a new symbol.
|
sendLinkRequest <= '0';
|
-- Dont do anything.
|
elsif (clk'event and clk = '1') then
|
|
sendRestartFromRetry <= sendRestartFromRetryOut;
|
|
sendLinkRequest <= sendLinkRequestOut;
|
end if;
|
end if;
|
|
end process;
|
|
|
|
-- REMARK: Reset statusReceived at startup...
|
|
process(outputErrorStopped_i, recoverActive_i, recoverCounter_i, ackId_i, bufferStatus_i,
|
|
statusReceived_i, numberSentLinkRequests_i)
|
|
begin
|
|
txControlUpdate_o <= '0';
|
|
outputErrorStopped_o <= outputErrorStopped_i;
|
|
recoverActive_o <= recoverActive_i;
|
|
recoverCounter_o <= recoverCounter_i;
|
|
ackId_o <= ackId_i;
|
|
bufferStatus_o <= bufferStatus_i;
|
|
statusReceived_o <= statusReceived_i;
|
|
numberSentLinkRequests_o <= numberSentLinkRequests_i;
|
|
|
|
sendRestartFromRetryOut <= '0';
|
|
sendLinkRequestOut <= '0';
|
|
|
|
if (recoverActive_i = '1') then
|
|
if (ackId_i /= recoverCounter_i) then
|
|
ackId_o <= std_logic_vector(unsigned(ackId_i) + 1);
|
else
|
else
|
-- Go back to the uninitialized state.
|
recoverActive_o <= '0';
|
stateNext <= STATE_UNINITIALIZED;
|
outputErrorStopped_o <= '0';
|
|
end if;
|
|
else
|
|
if (txFull_i = '0') then
|
|
if (operational_i = '0') then
|
|
if (txControlEmpty_i = '0') then
|
|
if (txControlStype0 = STYPE0_STATUS) then
|
|
-- A status-control symbol has been received.
|
|
ackId_o <= txControlParameter0;
|
|
bufferStatus_o <= txControlParameter1;
|
|
statusReceived_o <= '1';
|
|
else
|
|
-- Discard all other received symbols in this state.
|
|
end if;
|
|
txControlUpdate_o <= '1';
|
end if;
|
end if;
|
|
else
|
|
-- Check if the oldest frame timeout has expired.
|
|
if ((ackId_i /= ackIdWindow_i) and
|
|
(timeExpired = '1')) then
|
|
-- There has been a timeout on a transmitted frame.
|
|
|
when STATE_NORMAL =>
|
if (outputErrorStopped_i = '1') then
|
-------------------------------------------------------------------
|
-- Count the number of retransmissions and abort if
|
-- This state is the normal state. It relays frames and handle flow
|
-- no reply has been received for too many times.
|
-- control.
|
if (unsigned(numberSentLinkRequests_i) /= 0) then
|
-------------------------------------------------------------------
|
-- Not sent link-request too many times.
|
|
|
-- Check that both the port and link is initialized.
|
-- Send another link-request.
|
if (portInitialized_i = '1') and (linkInitialized_i = '1') then
|
sendLinkRequestOut <= '1';
|
-- The port and link is initialized.
|
numberSentLinkRequests_o <= std_logic_vector(unsigned(numberSentLinkRequests_i) - 1);
|
|
else
|
|
-- No response for too many times.
|
|
-- REMARK: What to do here???
|
|
--readWindowReset_o <= '1';
|
|
--stateNext <= STATE_UNINITIALIZED;
|
|
end if;
|
|
else
|
|
sendLinkRequestOut <= '1';
|
|
numberSentLinkRequests_o <= NUMBER_LINK_RESPONSE_RETRIES;
|
|
outputErrorStopped_o <= '1';
|
|
end if;
|
|
else
|
|
-- There has been no timeout.
|
|
|
-- Check if any control symbol has been received from the link
|
-- Check if any control symbol has been received from the link
|
-- partner.
|
-- partner.
|
if (txControlEmpty_i = '0') then
|
if (txControlEmpty_i = '0') then
|
-- A control symbol has been received.
|
-- A control symbol has been received.
|
|
|
-- Check the received control symbol.
|
-- Check the received control symbol.
|
case txControlStype0 is
|
case txControlStype0 is
|
|
|
when STYPE0_STATUS =>
|
when STYPE0_STATUS =>
|
|
if (outputErrorStopped_i = '0') then
|
-- Save the number of buffers in the link partner.
|
-- Save the number of buffers in the link partner.
|
bufferStatusNext <= txControlParameter1;
|
bufferStatus_o <= txControlParameter1;
|
|
end if;
|
|
|
when STYPE0_PACKET_ACCEPTED =>
|
when STYPE0_PACKET_ACCEPTED =>
|
-- The link partner is accepting a frame.
|
-- The link partner is accepting a frame.
|
|
|
|
if (outputErrorStopped_i = '0') then
|
-- Save the number of buffers in the link partner.
|
-- Save the number of buffers in the link partner.
|
bufferStatusNext <= txControlParameter1;
|
bufferStatus_o <= txControlParameter1;
|
|
|
-- Check if expecting this type of reply and that the ackId is
|
-- Check if expecting this type of reply and that the ackId is
|
-- expected.
|
-- expected.
|
if ((ackIdCurrent /= ackIdWindowCurrent) and
|
if ((ackId_i /= ackIdWindow_i) and
|
(ackIdCurrent = unsigned(txControlParameter0))) then
|
(ackId_i = txControlParameter0)) then
|
-- The packet-accepted is expected and the ackId is the expected.
|
-- The packet-accepted is expected and the ackId is the expected.
|
-- The frame has been accepted by the link partner.
|
-- The frame has been accepted by the link partner.
|
|
|
-- Update to a new buffer and increment the ackId.
|
-- Update to a new buffer and increment the ackId.
|
readFrame_o <= '1';
|
readFrame_o <= '1';
|
ackIdNext <= ackIdCurrent + 1;
|
ackId_o <= std_logic_vector(unsigned(ackId_i) + 1);
|
else
|
else
|
-- Unexpected packet-accepted or packet-accepted for
|
-- Unexpected packet-accepted or packet-accepted for
|
-- unexpected ackId.
|
-- unexpected ackId.
|
counterNext <= NUMBER_LINK_RESPONSE_RETRIES;
|
sendLinkRequestOut <= '1';
|
stateNext <= STATE_SEND_LINK_REQUEST;
|
numberSentLinkRequests_o <= NUMBER_LINK_RESPONSE_RETRIES;
|
|
outputErrorStopped_o <= '1';
|
|
end if;
|
end if;
|
end if;
|
|
|
when STYPE0_PACKET_RETRY =>
|
when STYPE0_PACKET_RETRY =>
|
-- The link partner has asked for a frame retransmission.
|
-- The link partner has asked for a frame retransmission.
|
|
|
|
if (outputErrorStopped_i = '0') then
|
-- Save the number of buffers in the link partner.
|
-- Save the number of buffers in the link partner.
|
bufferStatusNext <= txControlParameter1;
|
bufferStatus_o <= txControlParameter1;
|
|
|
-- Check if the ackId is the one expected.
|
-- Check if the ackId is the one expected.
|
if (ackIdCurrent = unsigned(txControlParameter0)) then
|
if (ackId_i = txControlParameter0) then
|
-- The ackId to retry is expected.
|
-- The ackId to retry is expected.
|
-- Go to the output-retry-stopped state.
|
-- Go to the output-retry-stopped state.
|
stateNext <= STATE_OUTPUT_RETRY_STOPPED;
|
-- REMARK: The output-retry-stopped state is equivalent
|
|
-- to sending a restart-from-retry.
|
|
sendRestartFromRetryOut <= '1';
|
else
|
else
|
-- Unexpected ackId to retry.
|
-- Unexpected ackId to retry.
|
counterNext <= NUMBER_LINK_RESPONSE_RETRIES;
|
sendLinkRequestOut <= '1';
|
stateNext <= STATE_SEND_LINK_REQUEST;
|
numberSentLinkRequests_o <= NUMBER_LINK_RESPONSE_RETRIES;
|
|
outputErrorStopped_o <= '1';
|
|
end if;
|
end if;
|
end if;
|
|
|
when STYPE0_PACKET_NOT_ACCEPTED =>
|
when STYPE0_PACKET_NOT_ACCEPTED =>
|
|
if (outputErrorStopped_i = '0') then
|
-- Packet was rejected by the link-partner.
|
-- Packet was rejected by the link-partner.
|
-- REMARK: Indicate that this has happened to the outside...
|
sendLinkRequestOut <= '1';
|
counterNext <= NUMBER_LINK_RESPONSE_RETRIES;
|
numberSentLinkRequests_o <= NUMBER_LINK_RESPONSE_RETRIES;
|
stateNext <= STATE_SEND_LINK_REQUEST;
|
outputErrorStopped_o <= '1';
|
|
end if;
|
|
|
when STYPE0_LINK_RESPONSE =>
|
when STYPE0_LINK_RESPONSE =>
|
|
if (outputErrorStopped_i = '1') then
|
|
-- Check if the link partner return value is acceptable.
|
|
if ((unsigned(txControlParameter0) - unsigned(ackId_i)) <=
|
|
(unsigned(ackIdWindow_i) - unsigned(ackId_i))) then
|
|
-- Recoverable error.
|
|
-- Use the received ackId and recover by removing packets
|
|
-- that has been received by the link-partner.
|
|
recoverCounter_o <= txControlParameter0;
|
|
recoverActive_o <= '1';
|
|
else
|
|
-- Totally out of sync.
|
|
-- REMARK: What to do here???
|
|
--readWindowReset_o <= '1';
|
|
--stateNext <= STATE_UNINITIALIZED;
|
|
end if;
|
|
else
|
-- Dont expect or need a link-response in this state.
|
-- Dont expect or need a link-response in this state.
|
-- Discard it.
|
-- Discard it.
|
|
end if;
|
|
|
when STYPE0_VC_STATUS =>
|
when STYPE0_VC_STATUS =>
|
-- Not supported.
|
-- Not supported.
|
-- Discard it.
|
-- Discard it.
|
|
|
| Line 1021... |
Line 1159... |
null;
|
null;
|
end case;
|
end case;
|
|
|
-- Indicate the control symbol has been processed.
|
-- Indicate the control symbol has been processed.
|
txControlUpdate_o <= '1';
|
txControlUpdate_o <= '1';
|
else
|
end if;
|
-- No control symbol has been received.
|
end if;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
-- Check if the oldest frame timeout has expired.
|
-----------------------------------------------------------------------------
|
if ((ackIdCurrent /= ackIdWindowCurrent) and
|
-- N-2 pipeline stage.
|
(timeoutExpired = '1')) then
|
-- Create stype1-part of symbols and data symbols. Save the time when a
|
-- There has been a timeout on a transmitted frame.
|
-- packet was fully sent.
|
|
-- Input: sendRestartFromRetry, sendLinkRequest
|
|
-- Output: ackIdWindow, frameState, timeout(0 to 31),
|
|
-- symbolControlStart, symbolControlEnd, symbolControlRestart,
|
|
-- symbolControlLinkRequest, symbolData2, symbolData2Content.
|
|
-----------------------------------------------------------------------------
|
|
|
-- Send link-request.
|
process(clk, areset_n)
|
counterNext <= NUMBER_LINK_RESPONSE_RETRIES;
|
begin
|
stateNext <= STATE_SEND_LINK_REQUEST;
|
if (areset_n = '0') then
|
else
|
symbolControlRestart <= '0';
|
-- There has been no timeout.
|
symbolControlLinkRequest <= '0';
|
|
symbolControlStart <= '0';
|
|
symbolControlEnd <= '0';
|
|
symbolData <= '0';
|
|
symbolDataContent <= (others => '0');
|
|
elsif (clk'event and clk = '1') then
|
|
symbolControlRestart <= symbolControlRestartOut;
|
|
symbolControlLinkRequest <= symbolControlLinkRequestOut;
|
|
symbolControlStart <= symbolControlStartOut;
|
|
symbolControlEnd <= symbolControlEndOut;
|
|
symbolData <= symbolDataOut;
|
|
symbolDataContent <= symbolDataContentOut;
|
|
end if;
|
|
end process;
|
|
|
-- Check if the outbound fifo needs new data.
|
-- This process decide which stype1-part of a control symbols to send as well
|
if (txFull_i = '0') then
|
-- as all data symbols.
|
-- There is room available in the outbound FIFO.
|
process(frameState_i, ackIdWindow_i, timeCurrent_i, sendRestartFromRetry, sendLinkRequest)
|
|
begin
|
|
readFrame_o <= '0';
|
|
readFrameRestart_o <= '0';
|
|
readWindowReset_o <= '0';
|
|
readWindowNext_o <= '0';
|
|
readContent_o <= '0';
|
|
|
-- Check if there are any events from the receiver.
|
frameState_o <= frameState_i;
|
if (rxControlEmpty_i = '0') then
|
ackIdWindow_o <= ackIdWindow_i;
|
-- A symbol from the receiver should be transmitted.
|
|
|
|
-- Send the receiver symbol and a NOP.
|
|
-- REMARK: Combine this symbol with an STYPE1 to more effectivly
|
|
-- utilize the link.
|
|
symbolWrite <= '1';
|
|
symbolType <= SYMBOL_CONTROL;
|
|
stype0 <= rxControlStype0;
|
|
parameter0 <= rxControlParameter0;
|
|
parameter1 <= rxControlParameter1;
|
|
stype1 <= STYPE1_NOP;
|
|
cmd <= "000";
|
|
|
|
-- Remove the symbol from the fifo.
|
timeSentWrite_o <= '0';
|
rxControlUpdate_o <= '1';
|
timeSentWriteAddress_o <= ackIdWindow_i;
|
|
timeSentWriteData_o <= timeCurrent_i;
|
|
|
|
symbolControlRestartOut <= '0';
|
|
symbolControlLinkRequestOut <= '0';
|
|
symbolControlStartOut <= '0';
|
|
symbolControlEndOut <= '0';
|
|
symbolDataOut <= '0';
|
|
symbolDataContentOut <= (others => '0');
|
|
|
|
if (recoverActive_i = '1') then
|
|
-- REMARK: Make sure idle is generated when this state is active...
|
|
ackIdWindow_o <= recoverCounter_i;
|
|
frameState_o <= FRAME_START;
|
|
|
-- Check if the transmitted symbol contains status about
|
if (ackId_i /= recoverCounter_i) then
|
-- available buffers.
|
readFrame_o <= '1';
|
if ((rxControlStype0 = STYPE0_PACKET_ACCEPTED) or
|
|
(rxControlStype0 = STYPE0_PACKET_RETRY)) then
|
|
-- A symbol containing the bufferStatus has been sent.
|
|
symbolsTransmittedNext <= 0;
|
|
else
|
else
|
-- A symbol not containing the bufferStatus has been sent.
|
readWindowReset_o <= '1';
|
-- REMARK: symbolsTransmitted might overflow...
|
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
|
end if;
|
end if;
|
else
|
else
|
-- No events from the receiver.
|
if (txFull_i = '0') then
|
|
if (operational_i = '0') then
|
|
-----------------------------------------------------------------------
|
|
-- This state is entered at startup. A port that is not initialized
|
|
-- should only transmit idle sequences.
|
|
-----------------------------------------------------------------------
|
|
|
-- Check if a status symbol must be sent.
|
-- Initialize framing before entering the operational state.
|
if (symbolsTransmittedCurrent = 255) then
|
-- REMARK: Only do this when the portInitialized becomes asserted???
|
-- A status symbol must be sent.
|
frameState_o <= FRAME_START;
|
|
ackIdWindow_o <= ackId_i;
|
|
readWindowReset_o <= '1';
|
|
else
|
|
-------------------------------------------------------------------
|
|
-- This state is the operational state. It relays frames and handle
|
|
-- flow control.
|
|
-------------------------------------------------------------------
|
|
|
-- Reset the number of transmitted symbols between statuses.
|
if (sendRestartFromRetry = '1') then
|
symbolsTransmittedNext <= 0;
|
-- Send a restart-from-retry control symbol to acknowledge the restart
|
|
-- of the frame.
|
|
symbolControlRestartOut <= '1';
|
|
|
-- Send status.
|
-- Make sure there wont be any timeout before the frame is
|
symbolWrite <= '1';
|
-- starting to be retransmitted.
|
symbolType <= SYMBOL_CONTROL;
|
timeSentWrite_o <= '1';
|
stype0 <= STYPE0_STATUS;
|
|
parameter0 <= ackIdStatus_i;
|
|
parameter1 <= "11111";
|
|
stype1 <= STYPE1_NOP;
|
|
cmd <= "000";
|
|
else
|
|
-- A status symbol does not have to be sent.
|
|
|
|
|
-- Restart the frame transmission.
|
|
ackIdWindow_o <= ackId_i;
|
|
frameState_o <= FRAME_START;
|
|
readWindowReset_o <= '1';
|
|
end if;
|
|
|
|
if (sendLinkRequest = '1') then
|
|
-- Dont restart the packet transmission since we do not yet know which
|
|
-- packets that was successfully received by our link partner.
|
|
|
|
-- Send a link-request symbol.
|
|
symbolControlLinkRequestOut <= '1';
|
|
|
|
-- Write the current timer value.
|
|
timeSentWrite_o <= '1';
|
|
end if;
|
|
|
|
if ((sendRestartFromRetry = '0') and (sendLinkRequest = '0') and
|
|
(outputErrorStopped_i = '0')) then
|
-- Check if a frame transfer is in progress.
|
-- Check if a frame transfer is in progress.
|
case frameStateCurrent is
|
-- REMARK: Hold any data symbol if there is a pending symbol from the
|
|
-- receiver side...
|
|
|
|
case frameState_i is
|
|
|
when FRAME_START =>
|
when FRAME_START =>
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
-- No frame has been started.
|
-- No frame has been started.
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
|
|
-- Wait for a new frame to arrive from the frame buffer,
|
-- Wait for a new frame to arrive from the frame buffer,
|
-- for new buffers to be available at the link-partner
|
-- for new buffers to be available at the link-partner
|
-- and also check that a maximum 31 frames are outstanding.
|
-- and also check that a maximum 31 frames are outstanding.
|
if ((readWindowEmpty_i = '0') and (bufferStatusCurrent /= "00000") and
|
-- REMARK: Only update readContent_o in the last instance
|
((ackIdWindowCurrent - ackIdCurrent) /= 31)) then
|
-- if cascaded...
|
|
if ((readWindowEmpty_i = '0') and
|
|
(bufferStatus_i /= "00000") and
|
|
((unsigned(ackIdWindow_i) - unsigned(ackId_i)) /= 31)) then
|
-- New data is available for transmission and there
|
-- New data is available for transmission and there
|
-- is room to receive it at the other side.
|
-- is room to receive it at the other side.
|
|
|
-- Indicate that a control symbol has been sent to start the
|
-- Indicate that a control symbol has been sent to start the
|
-- transmission of the frame.
|
-- transmission of the frame.
|
frameStateNext <= FRAME_CHECK;
|
frameState_o <= FRAME_CHECK;
|
|
|
-- Update the output from the frame buffer to contain the
|
-- Update the output from the frame buffer to contain the
|
-- data when it is read later.
|
-- data when it is read later.
|
readContent_o <= '1';
|
readContent_o <= '1';
|
else
|
|
-- There are no frame data to send or the link partner has
|
|
-- no available buffers.
|
|
|
|
-- Send idle-sequence.
|
|
symbolWrite <= '1';
|
|
symbolType <= SYMBOL_IDLE;
|
|
|
|
-- A symbol not containing the buffer status has been sent.
|
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
|
end if;
|
end if;
|
|
|
when FRAME_CHECK =>
|
when FRAME_CHECK =>
|
-------------------------------------------------------
|
-------------------------------------------------------
|
-- Check if we are allowed to transmit this packet.
|
-- Check if we are allowed to transmit this packet.
|
-------------------------------------------------------
|
-------------------------------------------------------
|
|
|
-- Check if this packet is allowed to be transmitted.
|
-- Check if this packet is allowed to be transmitted.
|
if ((portEnable_i = '1') or (readContentData_i(19 downto 16) = FTYPE_MAINTENANCE_CLASS)) then
|
if ((portEnable_i = '1') or
|
|
(readContentData_i(19 downto 16) = FTYPE_MAINTENANCE_CLASS)) then
|
-- The packet may be transmitted.
|
-- The packet may be transmitted.
|
|
|
-- Indicate that a control symbol has been sent to start the
|
-- Indicate that a control symbol has been sent to start the
|
-- transmission of the frame.
|
-- transmission of the frame.
|
frameStateNext <= FRAME_ACKID;
|
frameState_o <= FRAME_ACKID;
|
|
frameWordCounter_o <= readContentWords_i;
|
-- Send a control symbol to start the packet and a status to complete
|
frameContent_o <= readContentData_i;
|
-- the symbol.
|
|
symbolWrite <= '1';
|
-- Send a control symbol to start the packet and a status to
|
symbolType <= SYMBOL_CONTROL;
|
-- complete the symbol.
|
stype0 <= STYPE0_STATUS;
|
symbolControlStartOut <= '1';
|
parameter0 <= ackIdStatus_i;
|
|
parameter1 <= "11111";
|
|
stype1 <= STYPE1_START_OF_PACKET;
|
|
cmd <= "000";
|
|
|
|
-- A symbol containing the bufferStatus has been sent.
|
|
symbolsTransmittedNext <= 0;
|
|
else
|
else
|
-- The packet should be discarded.
|
-- The packet should be discarded.
|
|
-- Send idle-sequence.
|
|
|
-- Check that there are no outstanding packets that
|
-- Check that there are no outstanding packets that
|
-- has not been acknowledged.
|
-- has not been acknowledged.
|
if(ackIdWindowCurrent /= ackIdCurrent) then
|
if(unsigned(ackIdWindow_i) = unsigned(ackId_i)) then
|
-- There are packets that has not been acknowledged.
|
|
|
|
-- Send idle-sequence.
|
|
symbolWrite <= '1';
|
|
symbolType <= SYMBOL_IDLE;
|
|
|
|
-- A symbol not containing the buffer status has been sent.
|
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
|
else
|
|
-- No unacknowledged packets.
|
-- No unacknowledged packets.
|
-- It is now safe to remove the unallowed frame.
|
-- It is now safe to remove the unallowed frame.
|
readFrame_o <= '1';
|
readFrame_o <= '1';
|
|
|
-- Go back and send a new frame.
|
-- Go back and send a new frame.
|
frameStateNext <= FRAME_START;
|
frameState_o <= FRAME_START;
|
end if;
|
end if;
|
end if;
|
end if;
|
|
|
when FRAME_ACKID =>
|
when FRAME_ACKID =>
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
| Line 1181... |
Line 1350... |
-- ackId.
|
-- ackId.
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
|
|
-- Write a new data symbol and fill in our ackId on the
|
-- Write a new data symbol and fill in our ackId on the
|
-- packet.
|
-- packet.
|
symbolWrite <= '1';
|
symbolDataOut <= '1';
|
symbolType <= SYMBOL_DATA;
|
symbolDataContentOut <=
|
symbolData <= std_logic_vector(ackIdWindowCurrent) & "0" & readContentData_i(25 downto 0);
|
std_logic_vector(ackIdWindow_i) & "0" &
|
|
frameContent_i((32*NUMBER_WORDS)-1 downto (32*(NUMBER_WORDS-1))-1);
|
-- Continue to send the rest of the body of the packet.
|
|
|
if (unsigned(frameWordCounter_i) /= 0) then
|
|
frameWordCounter_o <=
|
|
std_logic_vector(unsigned(frameWordCounter_i) - 1);
|
|
frameContent_o <=
|
|
frameContent_i((32*(NUMBER_WORDS-1))-1 downto 0) & x"0000";
|
|
else
|
readContent_o <= '1';
|
readContent_o <= '1';
|
frameStateNext <= FRAME_BODY;
|
frameWordCounter_o <= readContentWords_i;
|
|
frameContent_o <= readContentData_i;
|
|
end if;
|
|
|
-- A symbol not containing the buffer status has been sent.
|
-- Continue to send the rest of the body of the packet.
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
frameState_o <= FRAME_BODY;
|
|
|
when FRAME_BODY =>
|
when FRAME_BODY =>
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
-- The frame has not been fully sent.
|
-- The frame has not been fully sent.
|
-- Send a data symbol.
|
-- Send a data symbol.
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
-- REMARK: Add support for partial frames...
|
-- REMARK: There will be idle symbols generated here if the
|
|
-- end-of-packet cannot be generated directly following the last
|
-- Check if the frame is ending.
|
-- data symbol... need to rewrite PacketBufferWindow to indicate
|
if (readContentEnd_i = '0') then
|
-- the end at the last word.
|
-- The frame is not ending.
|
-- REMARK: Dont send anything if there is a pending symbol in the
|
|
-- rx-control fifo to let it be transmitted in the middle of the
|
|
-- packet...
|
|
|
-- Write a new data symbol.
|
-- Write a new data symbol.
|
symbolWrite <= '1';
|
symbolDataOut <= '1';
|
symbolType <= SYMBOL_DATA;
|
symbolDataContentOut <=
|
symbolData <= readContentData_i;
|
frameContent_i((32*NUMBER_WORDS)-1 downto (32*(NUMBER_WORDS-1))-1);
|
|
|
-- Continue to send the rest of the body of the packet.
|
if (unsigned(frameWordCounter_i) /= 0) then
|
readContent_o <= '1';
|
frameWordCounter_o <=
|
|
std_logic_vector(unsigned(frameWordCounter_i) - 1);
|
-- A symbol not containing the buffer status has been sent.
|
frameContent_o <=
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
frameContent_i((32*(NUMBER_WORDS-1))-1 downto 0) & x"0000";
|
else
|
else
|
|
-- Check if the frame is ending.
|
|
if (readContentEnd_i = '1') then
|
-- The frame is ending.
|
-- The frame is ending.
|
|
|
-- Update the window to the next frame.
|
-- Update the window to the next frame.
|
-- It takes one tick for the output from the frame
|
-- It takes one tick for the output from the frame
|
-- buffer to get updated.
|
-- buffer to get updated.
|
readWindowNext_o <= '1';
|
readWindowNext_o <= '1';
|
|
|
-- Proceed to check if there is another frame to start
|
-- Proceed to check if there is another frame to start
|
-- with directly.
|
-- with directly.
|
frameStateNext <= FRAME_END;
|
frameState_o <= FRAME_END;
|
|
else
|
|
readContent_o <= '1';
|
|
frameWordCounter_o <= readContentWords_i;
|
|
frameContent_o <= readContentData_i;
|
|
end if;
|
end if;
|
end if;
|
|
|
when FRAME_END =>
|
when FRAME_END =>
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
-- A frame has ended and the window has been updated.
|
-- A frame has ended and the window has been updated.
|
| Line 1238... |
Line 1424... |
-- Check if there is a new frame pending.
|
-- Check if there is a new frame pending.
|
if (readWindowEmpty_i = '1') then
|
if (readWindowEmpty_i = '1') then
|
-- No new frame is pending.
|
-- No new frame is pending.
|
|
|
-- Send a control symbol to end the packet.
|
-- Send a control symbol to end the packet.
|
symbolWrite <= '1';
|
symbolControlEndOut <= '1';
|
symbolType <= SYMBOL_CONTROL;
|
|
stype0 <= STYPE0_STATUS;
|
|
parameter0 <= ackIdStatus_i;
|
|
parameter1 <= "11111";
|
|
stype1 <= STYPE1_END_OF_PACKET;
|
|
cmd <= "000";
|
|
|
|
-- A symbol containing the bufferStatus has been sent.
|
|
symbolsTransmittedNext <= 0;
|
|
end if;
|
end if;
|
|
|
-- Update the window ackId.
|
-- Update the window ackId.
|
ackIdWindowNext <= ackIdWindowCurrent + 1;
|
ackIdWindow_o <= std_logic_vector(unsigned(ackIdWindow_i) + 1);
|
|
|
-- Start timeout supervision for transmitted frame.
|
-- Start timeout supervision for transmitted frame.
|
timeoutWrite <= '1';
|
timeSentWrite_o <= '1';
|
timeoutAddress <= std_logic_vector(ackIdWindowCurrent);
|
|
|
|
-- Start a new frame the next time.
|
-- Start a new frame the next time.
|
frameStateNext <= FRAME_START;
|
frameState_o <= FRAME_START;
|
|
|
when others =>
|
when others =>
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
--
|
--
|
---------------------------------------------------------------
|
---------------------------------------------------------------
|
null;
|
null;
|
|
|
end case;
|
end case;
|
end if;
|
end if;
|
end if;
|
end if;
|
else
|
|
-- Wait for new storage in the transmission FIFO to become
|
|
-- available.
|
|
-- Dont do anything.
|
|
end if;
|
|
end if;
|
|
end if;
|
end if;
|
else
|
|
-- The port or the link has become uninitialized.
|
|
-- Go back to the uninitialized state.
|
|
stateNext <= STATE_UNINITIALIZED;
|
|
end if;
|
end if;
|
|
end process;
|
|
|
when STATE_OUTPUT_RETRY_STOPPED =>
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------
|
-- N-1
|
-- This is the output-retry-stopped state described in 5.9.1.5.
|
-- Create the stype0 and stype1 part of a control symbol.
|
-----------------------------------------------------------------------
|
-- This process makes sure that the buffer status are transmitted at least
|
|
-- every 255 symbol.
|
|
-- At startup it makes sure that at least 16 status symbols are transmitted
|
|
-- before the operational-state is entered.
|
|
-- Input: symbolControlStart, symbolControlEnd, symbolControlRestart,
|
|
-- symbolControlLinkRequest, symbolData, symbolDataContent
|
|
-- Output: symbolsTransmitted_o, operational_o,
|
|
-- symbolControl, stype0, parameter0, parameter1, stype1, cmd,
|
|
-- symbolData1, symbolData1Content
|
|
-----------------------------------------------------------------------------
|
|
|
-- Check if the outbound fifo needs new data.
|
process(clk, areset_n)
|
|
begin
|
|
if (areset_n = '0') then
|
|
controlValid <= '0';
|
|
stype0 <= (others=>'0');
|
|
parameter0 <= (others=>'0');
|
|
parameter1 <= (others=>'0');
|
|
stype1 <= STYPE1_NOP;
|
|
cmd <= (others=>'0');
|
|
dataValid <= '0';
|
|
dataContent <= (others=>'0');
|
|
elsif (clk'event and clk = '1') then
|
if (txFull_i = '0') then
|
if (txFull_i = '0') then
|
-- There is room available in the outbound FIFO.
|
controlValid <= controlValidOut;
|
|
stype0 <= stype0Out;
|
|
parameter0 <= parameter0Out;
|
|
parameter1 <= parameter1Out;
|
|
stype1 <= STYPE1_NOP;
|
|
cmd <= "000";
|
|
dataValid <= symbolData;
|
|
dataContent <= symbolDataContent;
|
|
|
-- Send a restart-from-retry control symbol to acknowledge the restart
|
if (symbolControlStart = '1') then
|
-- of the frame.
|
stype1 <= STYPE1_START_OF_PACKET;
|
symbolWrite <= '1';
|
end if;
|
symbolType <= SYMBOL_CONTROL;
|
if (symbolControlEnd = '1') then
|
stype0 <= STYPE0_STATUS;
|
stype1 <= STYPE1_END_OF_PACKET;
|
parameter0 <= ackIdStatus_i;
|
end if;
|
parameter1 <= "11111";
|
if (symbolControlRestart = '1') then
|
stype1 <= STYPE1_RESTART_FROM_RETRY;
|
stype1 <= STYPE1_RESTART_FROM_RETRY;
|
cmd <= "000";
|
end if;
|
|
if (symbolControlLinkRequest = '1') then
|
|
stype1 <= STYPE1_LINK_REQUEST;
|
|
cmd <= LINK_REQUEST_CMD_INPUT_STATUS;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
-- Make sure there wont be any timeout before the frame is
|
symbolControlStype1 <=
|
-- starting to be retransmitted.
|
symbolControlRestart or symbolControlLinkRequest or
|
timeoutWrite <= '1';
|
symbolControlStart or symbolControlEnd;
|
timeoutAddress <= std_logic_vector(ackIdCurrent);
|
|
|
|
-- Restart the frame transmission.
|
process(txFull_i, linkInitialized_i, ackIdStatus_i, portInitialized_i,
|
ackIdWindowNext <= ackIdCurrent;
|
operational_i, counter_i, statusReceived_i, symbolsTransmitted_i)
|
frameStateNext <= FRAME_START;
|
begin
|
readWindowReset_o <= '1';
|
operational_o <= operational_i;
|
|
counter_o <= counter_i;
|
|
|
-- Proceed back to the normal state.
|
controlValidOut <= '0';
|
stateNext <= STATE_NORMAL;
|
stype0Out <= STYPE0_STATUS;
|
|
parameter0Out <= ackIdStatus_i;
|
|
parameter1Out <= "11111";
|
|
|
-- A symbol containing the bufferStatus has been sent.
|
-- Check if there is room for more in the outbound fifo.
|
symbolsTransmittedNext <= 0;
|
if (txFull_i = '0') then
|
end if;
|
-- The outbound fifo needs to be filled.
|
|
|
when STATE_SEND_LINK_REQUEST =>
|
-- Check the operational state.
|
|
if (operational_i = '0') then
|
-----------------------------------------------------------------------
|
-----------------------------------------------------------------------
|
-- Send a link-request symbol when the transmission fifo is ready. Then
|
-- This state is entered at startup. A port that is not initialized
|
-- always proceed to the output-error-state.
|
-- should only transmit idle sequences.
|
-----------------------------------------------------------------------
|
-----------------------------------------------------------------------
|
|
|
-- Check if the outbound fifo needs new data.
|
-- Check if the port is initialized.
|
if (txFull_i = '0') then
|
if (portInitialized_i = '1') then
|
-- There is room available in the outbound FIFO.
|
---------------------------------------------------------------------
|
|
-- The specification requires a status control symbol being sent at
|
|
-- least every 1024 code word until an error-free status has been
|
|
-- received. This implies that at most 256 idle sequences should be
|
|
-- sent in between status control symbols. Once an error-free status
|
|
-- has been received, status symbols may be sent more rapidly. At
|
|
-- least 15 statuses has to be transmitted once an error-free status
|
|
-- has been received.
|
|
---------------------------------------------------------------------
|
|
|
-- Send a link-request symbol.
|
-- Check if we are ready to change state to operational.
|
symbolWrite <= '1';
|
if ((linkInitialized_i = '1') and
|
symbolType <= SYMBOL_CONTROL;
|
(unsigned(counter_i) = 0)) then
|
stype0 <= STYPE0_STATUS;
|
-- Receiver has received enough error free status symbols and we
|
parameter0 <= ackIdStatus_i;
|
-- have transmitted enough.
|
parameter1 <= "11111";
|
|
stype1 <= STYPE1_LINK_REQUEST;
|
|
cmd <= LINK_REQUEST_CMD_INPUT_STATUS;
|
|
|
|
-- Write the current timer value.
|
-- Considder ourselfs operational.
|
timeoutWrite <= '1';
|
operational_o <= '1';
|
timeoutAddress <= std_logic_vector(ackIdCurrent);
|
else
|
|
-- Not ready to change state to operational.
|
|
-- Dont do anything.
|
|
end if;
|
|
|
-- Proceed to the output-error-stopped state.
|
-- Check if idle sequence or a status symbol should be transmitted.
|
stateNext <= STATE_OUTPUT_ERROR_STOPPED;
|
if (((statusReceived_i = '0') and (symbolsTransmitted_i = x"ff")) or
|
|
((statusReceived_i = '1') and (symbolsTransmitted_i > x"0f"))) then
|
|
-- A status symbol should be transmitted.
|
|
|
-- A symbol containing the bufferStatus has been sent.
|
-- Send a status control symbol to the link partner.
|
symbolsTransmittedNext <= 0;
|
controlValidOut <= '1';
|
|
|
|
-- Reset idle sequence transmission counter.
|
|
symbolsTransmitted_o <= (others=>'0');
|
|
|
|
-- Check if the number of transmitted statuses should be updated.
|
|
if (statusReceived_i = '1') and (unsigned(counter_i) /= 0) then
|
|
counter_o <= std_logic_vector(unsigned(counter_i) - 1);
|
|
end if;
|
|
else
|
|
-- Increment the idle sequence transmission counter.
|
|
symbolsTransmitted_o <= std_logic_vector(unsigned(symbolsTransmitted_i) + 1);
|
end if;
|
end if;
|
|
else
|
|
-- The port is not initialized.
|
|
-- Reset initialization variables.
|
|
counter_o <= NUMBER_STATUS_TRANSMIT;
|
|
end if;
|
|
else
|
|
---------------------------------------------------------------------
|
|
-- This is the operational state.
|
|
-- It is entered once the link has been considdered up and running.
|
|
---------------------------------------------------------------------
|
|
|
when STATE_OUTPUT_ERROR_STOPPED =>
|
-- Check if the port is still initialized.
|
-------------------------------------------------------------------
|
if (portInitialized_i = '1') then
|
-- This state is the error stopped state described in 5.13.2.7.
|
-- The port is still initialized.
|
-------------------------------------------------------------------
|
|
|
|
-- Check that both the port and link is initialized.
|
-- Check if a status must be sent.
|
if (portInitialized_i = '1') and (linkInitialized_i = '1') then
|
-- A status must be sent when there are not other stype0 value to
|
-- The port and link is initialized.
|
-- send or if too many symbols without buffer-status has been sent.
|
|
-- REMARK: Is there a risk of a race when a generated status-symbol
|
|
-- is sent before another symbol stored in the rx-control fifo???
|
|
if (((symbolControlStype1 = '1') and (rxControlEmpty_i = '1')) or
|
|
((symbolControlStype1 = '0') and (symbolData = '0') and
|
|
(symbolsTransmitted_i = x"ff"))) then
|
|
-- A control symbol is about to be sent without pending symbol from
|
|
-- receiver or too many idle symbols has been sent.
|
|
|
|
-- Force the sending of a status containing the bufferStatus.
|
|
controlValidOut <= '1';
|
|
symbolsTransmitted_o <= (others=>'0');
|
|
elsif ((symbolControlStype1 = '1') and (rxControlEmpty_i = '0')) then
|
|
-- A control symbol is about to be sent and there is a pending
|
|
-- symbol from the receiver.
|
|
|
-- Check if any control symbol has been received from the link
|
-- Remove the symbol from the fifo.
|
-- partner.
|
rxControlUpdate_o <= '1';
|
if (txControlEmpty_i = '0') then
|
|
-- A control symbol has been received.
|
|
|
|
-- Check the received control symbol.
|
-- Send the receiver symbol.
|
case txControlStype0 is
|
controlValidOut <= '1';
|
|
stype0Out <= rxControlStype0;
|
|
parameter0Out <= rxControlParameter0;
|
|
parameter1Out <= rxControlParameter1;
|
|
|
when STYPE0_PACKET_ACCEPTED =>
|
-- Check if the transmitted symbol contains status about
|
-- Wait for a link-response.
|
-- available buffers.
|
-- Discard these.
|
if ((rxControlStype0 = STYPE0_PACKET_ACCEPTED) or
|
|
(rxControlStype0 = STYPE0_PACKET_RETRY)) then
|
|
-- A symbol containing the bufferStatus has been sent.
|
|
symbolsTransmitted_o <= (others=>'0');
|
|
else
|
|
-- A symbol not containing the bufferStatus has been sent.
|
|
symbolsTransmitted_o <= std_logic_vector(unsigned(symbolsTransmitted_i) + 1);
|
|
end if;
|
|
else
|
|
-- A symbol not containing the bufferStatus has been sent.
|
|
controlValidOut <= '0';
|
|
symbolsTransmitted_o <= std_logic_vector(unsigned(symbolsTransmitted_i) + 1);
|
|
end if;
|
|
else
|
|
-- The port is not initialized anymore.
|
|
-- Change the operational state.
|
|
operational_o <= '0';
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
when STYPE0_PACKET_RETRY =>
|
-----------------------------------------------------------------------------
|
-- Wait for a link-response.
|
-- N pipeline stage.
|
-- Discard these.
|
-- Make all symbols ready for transmission, i.e. calculate the CRC5 on
|
|
-- control symbols.
|
|
-- Inputs: controlValid, stype0, parameter0, parameter1, stype1, cmd,
|
|
-- symbolData1, symbolData1Content
|
|
-----------------------------------------------------------------------------
|
|
|
when STYPE0_PACKET_NOT_ACCEPTED =>
|
controlContent(31 downto 29) <= stype0;
|
-- Wait for a link-response.
|
controlContent(28 downto 24) <= parameter0;
|
-- Discard these.
|
controlContent(23 downto 19) <= parameter1;
|
|
controlContent(18 downto 16) <= stype1;
|
|
controlContent(15 downto 13) <= cmd;
|
|
controlContent(12 downto 8) <= crc5;
|
|
controlContent(7 downto 0) <= x"00";
|
|
|
when STYPE0_STATUS =>
|
Crc5Calculator: Crc5ITU
|
-- Wait for a link-response.
|
port map(
|
-- Discard these.
|
d_i=>controlContent(31 downto 13), crc_o=>crc5);
|
|
|
when STYPE0_LINK_RESPONSE =>
|
txWrite_o <= not txFull_i;
|
-- Check if the link partner return value is acceptable.
|
process(clk, areset_n)
|
if ((unsigned(txControlParameter0) - ackIdCurrent) <=
|
begin
|
(ackIdWindowCurrent - ackIdCurrent)) then
|
if (areset_n = '0') then
|
-- Recoverable error.
|
txType_o <= SYMBOL_IDLE;
|
-- Use the received ackId and recover by removing packets
|
txData_o <= (others=>'0');
|
-- that were received by the link-partner.
|
elsif (clk'event and clk = '1') then
|
ackIdWindowNext <= unsigned(txControlParameter0);
|
if (txFull_i = '0') then
|
stateNext <= STATE_RECOVER;
|
txType_o <= SYMBOL_IDLE;
|
else
|
if (controlValid = '1') then
|
-- Totally out of sync.
|
txType_o <= SYMBOL_CONTROL;
|
stateNext <= STATE_FATAL_ERROR;
|
txData_o <= controlContent;
|
|
end if;
|
|
if (dataValid = '1') then
|
|
txType_o <= SYMBOL_DATA;
|
|
txData_o <= dataContent;
|
|
end if;
|
end if;
|
end if;
|
|
end if;
|
|
end process;
|
|
|
when STYPE0_VC_STATUS =>
|
end architecture;
|
-- Not supported.
|
|
|
|
when STYPE0_RESERVED =>
|
|
-- Not supported.
|
|
|
|
when STYPE0_IMPLEMENTATION_DEFINED =>
|
|
-- Not supported.
|
|
|
|
when others =>
|
-------------------------------------------------------------------------------
|
null;
|
--
|
end case;
|
-------------------------------------------------------------------------------
|
|
library ieee;
|
|
use ieee.std_logic_1164.all;
|
|
use ieee.numeric_std.all;
|
|
use work.rio_common.all;
|
|
|
-- Indicate the control symbol has been processed.
|
|
txControlUpdate_o <= '1';
|
|
else
|
|
-- No control symbol has been received.
|
|
|
|
-- Check if the timeout for a link-response has expired.
|
entity RioReceiver is
|
if (timeoutExpired = '1') then
|
generic(
|
-- There was no reply on the link-request.
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
|
port(
|
|
clk : in std_logic;
|
|
areset_n : in std_logic;
|
|
|
-- Count the number of retransmissions and abort if
|
portEnable_i : in std_logic;
|
-- no reply has been received for too many times.
|
|
if (counterCurrent /= 0) then
|
localAckIdWrite_i : in std_logic;
|
-- Not sent link-request too many times.
|
inboundAckId_i : in std_logic_vector(4 downto 0);
|
|
inboundAckId_o : out std_logic_vector(4 downto 0);
|
|
|
|
portInitialized_i : in std_logic;
|
|
rxEmpty_i : in std_logic;
|
|
rxRead_o : out std_logic;
|
|
rxType_i : in std_logic_vector(2*NUMBER_WORDS-1 downto 0);
|
|
rxData_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
|
|
txControlWrite_o : out std_logic_vector(NUMBER_WORDS-1 downto 0);
|
|
txControlSymbol_o : out std_logic_vector(12*NUMBER_WORDS downto 0);
|
|
rxControlWrite_o : out std_logic_vector(NUMBER_WORDS-1 downto 0);
|
|
rxControlSymbol_o : out std_logic_vector(12*NUMBER_WORDS downto 0);
|
|
|
|
ackIdStatus_o : out std_logic_vector(4 downto 0);
|
|
linkInitialized_o : out std_logic;
|
|
|
|
writeFrameFull_i : in std_logic;
|
|
writeFrame_o : out std_logic;
|
|
writeFrameAbort_o : out std_logic;
|
|
writeContent_o : out std_logic;
|
|
writeContentWords_o : out std_logic_vector(1 downto 0);
|
|
writeContentData_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
|
end entity;
|
|
|
|
-------------------------------------------------------------------------------
|
|
--
|
|
-------------------------------------------------------------------------------
|
|
architecture RioReceiverImpl of RioReceiver is
|
|
|
-- Send another link-request.
|
component RioReceiverCore is
|
counterNext <= counterCurrent - 1;
|
generic(
|
stateNext <= STATE_SEND_LINK_REQUEST;
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
else
|
port(
|
-- No response for too many times.
|
clk : in std_logic;
|
stateNext <= STATE_FATAL_ERROR;
|
areset_n : in std_logic;
|
end if;
|
|
else
|
|
-- There has been no timeout.
|
|
|
|
-- Check if the outbound fifo needs new data.
|
-- Status signals used for maintenance.
|
if (txFull_i = '0') then
|
portEnable_i : in std_logic;
|
-- There is room available in the outbound FIFO.
|
|
|
|
-- Check if there are any events from the receiver.
|
-- Support for localAckIdCSR.
|
if (rxControlEmpty_i = '0') then
|
-- REMARK: Add support for this???
|
-- A symbol from the receiver should be transmitted.
|
localAckIdWrite_i : in std_logic;
|
|
inboundAckId_i : in std_logic_vector(4 downto 0);
|
-- Send the receiver symbol and a NOP.
|
inboundAckId_o : out std_logic_vector(4 downto 0);
|
symbolWrite <= '1';
|
|
symbolType <= SYMBOL_CONTROL;
|
|
stype0 <= rxControlStype0;
|
|
parameter0 <= rxControlParameter0;
|
|
parameter1 <= rxControlParameter1;
|
|
stype1 <= STYPE1_NOP;
|
|
cmd <= "000";
|
|
|
|
-- Remove the symbol from the fifo.
|
-- Port input interface.
|
rxControlUpdate_o <= '1';
|
portInitialized_i : in std_logic;
|
|
rxEmpty_i : in std_logic;
|
|
rxRead_o : out std_logic;
|
|
rxType_i : in std_logic_vector(1 downto 0);
|
|
rxData_i : in std_logic_vector(31 downto 0);
|
|
|
-- Check if the transmitted symbol contains status about
|
-- Receiver has received a control symbol containing:
|
-- available buffers.
|
-- packet-accepted, packet-retry, packet-not-accepted,
|
-- The receiver never send any status so that does not have
|
-- status, VC_status, link-response
|
-- to be checked.
|
txControlWrite_o : out std_logic;
|
if ((rxControlStype0 = STYPE0_PACKET_ACCEPTED) or
|
txControlSymbol_o : out std_logic_vector(12 downto 0);
|
(rxControlStype0 = STYPE0_PACKET_RETRY)) then
|
|
-- A symbol containing the bufferStatus has been sent.
|
|
symbolsTransmittedNext <= 0;
|
|
else
|
|
-- A symbol not containing the buffer status has been sent.
|
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
|
end if;
|
|
else
|
|
-- No events from the receiver.
|
|
-- There are no frame data to send or the link partner has
|
|
-- no available buffers.
|
|
|
|
-- Check if a status symbol must be sent.
|
-- Reciever wants to signal the link partner:
|
if (symbolsTransmittedCurrent = 255) then
|
-- a new frame has been accepted => packet-accepted(rxAckId, bufferStatus)
|
-- A status symbol must be sent.
|
-- a frame needs to be retransmitted due to buffering =>
|
|
-- packet-retry(rxAckId, bufferStatus)
|
|
-- a frame is rejected due to errors => packet-not-accepted
|
|
-- a link-request should be answered => link-response
|
|
rxControlWrite_o : out std_logic;
|
|
rxControlSymbol_o : out std_logic_vector(12 downto 0);
|
|
|
-- Reset the number of transmitted symbols between statuses.
|
-- Status signals used internally.
|
symbolsTransmittedNext <= 0;
|
ackIdStatus_o : out std_logic_vector(4 downto 0);
|
|
linkInitialized_o : out std_logic;
|
|
|
-- Send status.
|
-- Core->Core cascading signals.
|
symbolWrite <= '1';
|
enable_o : out std_logic;
|
symbolType <= SYMBOL_CONTROL;
|
operational_i : in std_logic;
|
stype0 <= STYPE0_STATUS;
|
operational_o : out std_logic;
|
parameter0 <= ackIdStatus_i;
|
inputRetryStopped_i : in std_logic;
|
parameter1 <= "11111";
|
inputRetryStopped_o : out std_logic;
|
stype1 <= STYPE1_NOP;
|
inputErrorStopped_i : in std_logic;
|
cmd <= "000";
|
inputErrorStopped_o : out std_logic;
|
else
|
ackId_i : in unsigned(4 downto 0);
|
-- A status symbol does not have to be sent.
|
ackId_o : out unsigned(4 downto 0);
|
|
frameIndex_i : in std_logic_vector(6 downto 0);
|
|
frameIndex_o : out std_logic_vector(6 downto 0);
|
|
frameWordCounter_i : in std_logic_vector(1 downto 0);
|
|
frameWordCounter_o : out std_logic_vector(1 downto 0);
|
|
frameContent_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
frameContent_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
crc_i : in std_logic_vector(15 downto 0);
|
|
crc_o : out std_logic_vector(15 downto 0);
|
|
|
-- Send idle-sequence.
|
-- Frame buffering interface.
|
symbolWrite <= '1';
|
writeFrameFull_i : in std_logic;
|
symbolType <= SYMBOL_IDLE;
|
writeFrame_o : out std_logic;
|
|
writeFrameAbort_o : out std_logic;
|
|
writeContent_o : out std_logic;
|
|
writeContentWords_o : out std_logic_vector(1 downto 0);
|
|
writeContentData_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
|
end component;
|
|
|
-- A symbol not containing the buffer status has been sent.
|
signal enable : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
symbolsTransmittedNext <= symbolsTransmittedCurrent + 1;
|
signal operationalCurrent, operationalNext : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
end if;
|
signal inputRetryStoppedCurrent, inputRetryStoppedNext : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
end if;
|
signal inputErrorStoppedCurrent, inputErrorStoppedNext : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
else
|
signal ackIdCurrent, ackIdNext : unsigned(5*NUMBER_WORDS-1 downto 0);
|
-- Wait for new storage in the transmission FIFO to become
|
signal frameIndexCurrent, frameIndexNext : std_logic_vector(7*NUMBER_WORDS-1 downto 0);
|
-- available.
|
signal frameWordCounterCurrent, frameWordCounterNext : std_logic_vector(2*NUMBER_WORDS-1 downto 0);
|
-- Dont do anything.
|
signal frameContentCurrent, frameContentNext : std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
end if;
|
signal crcCurrent, crcNext : std_logic_vector(16*NUMBER_WORDS-1 downto 0);
|
end if;
|
|
end if;
|
signal txControlWrite : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
else
|
signal rxControlWrite : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
-- The port or the link has become uninitialized.
|
|
-- Go back to the uninitialized state.
|
signal writeFrame : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
stateNext <= STATE_UNINITIALIZED;
|
signal writeFrameAbort : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
end if;
|
signal writeContent : std_logic_vector(NUMBER_WORDS-1 downto 0);
|
|
signal writeContentWords : std_logic_vector(2*NUMBER_WORDS-1 downto 0);
|
|
signal writeContentData : std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
|
when STATE_RECOVER =>
|
begin
|
-----------------------------------------------------------------------
|
|
-- A recoverable error condition has occurred.
|
|
-- When this state is entered, ackIdWindow should contain the ackId to
|
|
-- proceed with.
|
|
-----------------------------------------------------------------------
|
|
|
|
-- Check if the expected ackId has incremented enough.
|
-----------------------------------------------------------------------------
|
if (ackIdCurrent /= ackIdWindowCurrent) then
|
-- Output generation to packet buffer.
|
-- Remove this frame. It has been received by the link-partner.
|
-----------------------------------------------------------------------------
|
readFrame_o <= '1';
|
process(enable, writeFrame, writeFrameAbort,
|
ackIdNext <= ackIdCurrent + 1;
|
writeContent, writeContentWords, writeContentData)
|
else
|
begin
|
-- Keep this frame.
|
writeFrame_o <= '0';
|
-- Restart the window and the frame transmission.
|
writeFrameAbort_o <= '0';
|
frameStateNext <= FRAME_START;
|
writeContent_o <= '0';
|
readWindowReset_o <= '1';
|
writeContentWords_o <= (others=>'0');
|
stateNext <= STATE_NORMAL;
|
writeContentData_o <= (others=>'0');
|
|
for i in 0 to NUMBER_WORDS-1 loop
|
|
if ((writeFrame(i) = '1') and (enable(i) = '1')) then
|
|
writeFrame_o <= '1';
|
end if;
|
end if;
|
|
|
when STATE_FATAL_ERROR =>
|
if ((writeFrameAbort(i) = '1') and (enable(i) = '1')) then
|
-----------------------------------------------------------------------
|
writeFrameAbort_o <= '1';
|
-- A fatal error condition has occurred.
|
end if;
|
-----------------------------------------------------------------------
|
|
|
|
-- Reset the window and resynchronize the link.
|
if ((writeContent(i) = '1') and (enable(i) = '1')) then
|
-- REMARK: Count these situations...
|
writeContent_o <= '1';
|
-- REMARK: Do something else here???
|
writeContentWords_o <= writeContentWords(2*(i+1)-1 downto 2*i);
|
readWindowReset_o <= '1';
|
writeContentData_o <= writeContentData(32*(i+1)-1 downto 32*i);
|
stateNext <= STATE_UNINITIALIZED;
|
end if;
|
|
end loop;
|
|
end process;
|
|
|
when others =>
|
-----------------------------------------------------------------------------
|
-------------------------------------------------------------------
|
-- Protocol core and synchronization.
|
--
|
-----------------------------------------------------------------------------
|
-------------------------------------------------------------------
|
process(clk, areset_n)
|
null;
|
begin
|
end case;
|
if (areset_n = '0') then
|
|
operationalCurrent <= (others=>'0');
|
|
inputRetryStoppedCurrent <= (others=>'0');
|
|
inputErrorStoppedCurrent <= (others=>'0');
|
|
ackIdCurrent <= (others=>'0');
|
|
frameIndexCurrent <= (others => '0');
|
|
frameWordCounterCurrent <= (others=>'0');
|
|
frameContentCurrent <= (others=>'0');
|
|
crcCurrent <= (others=>'0');
|
|
elsif (clk'event and clk = '1') then
|
|
if (enable(0) = '1') then
|
|
operationalCurrent <= operationalNext;
|
|
inputRetryStoppedCurrent <= inputRetryStoppedNext;
|
|
inputErrorStoppedCurrent <= inputErrorStoppedNext;
|
|
ackIdCurrent <= ackIdNext;
|
|
frameIndexCurrent <= frameIndexNext;
|
|
frameWordCounterCurrent <= frameWordCounterNext;
|
|
frameContentCurrent <= frameContentNext;
|
|
crcCurrent <= crcNext;
|
|
end if;
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
end architecture;
|
CoreGeneration: for i in 0 to NUMBER_WORDS-1 generate
|
|
txControlWrite_o(i) <= txControlWrite(i) and enable(i);
|
|
rxControlWrite_o(i) <= rxControlWrite(i);
|
|
|
|
ReceiverCore: RioReceiverCore
|
|
generic map(NUMBER_WORDS=>NUMBER_WORDS)
|
|
port map(
|
|
clk=>clk,
|
|
areset_n=>areset_n,
|
|
portEnable_i=>portEnable_i,
|
|
localAckIdWrite_i=>localAckIdWrite_i,
|
|
inboundAckId_i=>inboundAckId_i,
|
|
inboundAckId_o=>inboundAckId_o,
|
|
portInitialized_i=>portInitialized_i,
|
|
rxEmpty_i=>rxEmpty_i,
|
|
rxRead_o=>rxRead_o,
|
|
rxType_i=>rxType_i,
|
|
rxData_i=>rxData_i,
|
|
txControlWrite_o=>txControlWrite(i),
|
|
txControlSymbol_o=>txControlSymbol_o(13*(i+1)-1 downto 13*i),
|
|
rxControlWrite_o=>rxControlWrite(i),
|
|
rxControlSymbol_o=>rxControlSymbol_o(13*(i+1)-1 downto 13*i),
|
|
ackIdStatus_o=>ackIdStatus_o,
|
|
linkInitialized_o=>linkInitialized_o,
|
|
enable_o=>enable(i),
|
|
operational_i=>operationalCurrent(i),
|
|
operational_o=>operationalNext(i),
|
|
inputRetryStopped_i=>inputRetryStoppedCurrent(i),
|
|
inputRetryStopped_o=>inputRetryStoppedNext(i),
|
|
inputErrorStopped_i=>inputErrorStoppedCurrent(i),
|
|
inputErrorStopped_o=>inputErrorStoppedNext(i),
|
|
ackId_i=>ackIdCurrent(5*(i+1)-1 downto 5*i),
|
|
ackId_o=>ackIdNext(5*(i+1)-1 downto 5*i),
|
|
frameIndex_i=>frameIndexCurrent(7*(i+1)-1 downto 7*i),
|
|
frameIndex_o=>frameIndexNext(7*(i+1)-1 downto 7*i),
|
|
frameWordCounter_i=>frameWordCounterCurrent(2*(i+1)-1 downto 2*i),
|
|
frameWordCounter_o=>frameWordCounterNext(2*(i+1)-1 downto 2*i),
|
|
frameContent_i=>frameContentCurrent(32*(i+1)-1 downto 32*i),
|
|
frameContent_o=>frameContentNext(32*(i+1)-1 downto 32*i),
|
|
crc_i=>crcCurrent(16*(i+1)-1 downto 16*i),
|
|
crc_o=>crcNext(16*(i+1)-1 downto 16*i),
|
|
writeFrameFull_i=>writeFrameFull_i,
|
|
writeFrame_o=>writeFrame(i),
|
|
writeFrameAbort_o=>writeFrameAbort(i),
|
|
writeContent_o=>writeContent(i),
|
|
writeContentWords_o=>writeContentWords(2*(i+1)-1 downto 2*i),
|
|
writeContentData_o=>writeContentData(32*(i+1)-1 downto 32*i));
|
|
end generate;
|
|
|
|
end architecture;
|
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
--
|
-- RioReceiverCore
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
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;
|
use work.rio_common.all;
|
use work.rio_common.all;
|
|
|
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
--
|
--
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
entity RioReceiver is
|
entity RioReceiverCore is
|
|
generic(
|
|
NUMBER_WORDS : natural range 1 to 4 := 1);
|
port(
|
port(
|
clk : in std_logic;
|
clk : in std_logic;
|
areset_n : in std_logic;
|
areset_n : in std_logic;
|
|
|
-- Status signals used for maintenance.
|
-- Status signals used for maintenance.
|
portEnable_i : in std_logic;
|
portEnable_i : in std_logic;
|
|
|
-- Support for localAckIdCSR.
|
-- Support for localAckIdCSR.
|
|
-- REMARK: Add support for this???
|
localAckIdWrite_i : in std_logic;
|
localAckIdWrite_i : in std_logic;
|
inboundAckId_i : in std_logic_vector(4 downto 0);
|
inboundAckId_i : in std_logic_vector(4 downto 0);
|
inboundAckId_o : out std_logic_vector(4 downto 0);
|
inboundAckId_o : out std_logic_vector(4 downto 0);
|
|
|
-- Port input interface.
|
-- Port input interface.
|
portInitialized_i : in std_logic;
|
portInitialized_i : in std_logic;
|
rxEmpty_i : in std_logic;
|
rxEmpty_i : in std_logic;
|
rxRead_o : out std_logic;
|
rxRead_o : out std_logic;
|
rxControl_i : in std_logic_vector(1 downto 0);
|
rxType_i : in std_logic_vector(1 downto 0);
|
rxData_i : in std_logic_vector(31 downto 0);
|
rxData_i : in std_logic_vector(31 downto 0);
|
|
|
-- Receiver has received a control symbol containing:
|
-- Receiver has received a control symbol containing:
|
-- packet-accepted, packet-retry, packet-not-accepted,
|
-- packet-accepted, packet-retry, packet-not-accepted,
|
-- status, VC_status, link-response
|
-- status, VC_status, link-response
|
| Line 1603... |
Line 1984... |
|
|
-- Status signals used internally.
|
-- Status signals used internally.
|
ackIdStatus_o : out std_logic_vector(4 downto 0);
|
ackIdStatus_o : out std_logic_vector(4 downto 0);
|
linkInitialized_o : out std_logic;
|
linkInitialized_o : out std_logic;
|
|
|
|
-- Core->Core cascading signals.
|
|
enable_o : out std_logic;
|
|
operational_i : in std_logic;
|
|
operational_o : out std_logic;
|
|
inputRetryStopped_i : in std_logic;
|
|
inputRetryStopped_o : out std_logic;
|
|
inputErrorStopped_i : in std_logic;
|
|
inputErrorStopped_o : out std_logic;
|
|
ackId_i : in unsigned(4 downto 0);
|
|
ackId_o : out unsigned(4 downto 0);
|
|
frameIndex_i : in std_logic_vector(6 downto 0);
|
|
frameIndex_o : out std_logic_vector(6 downto 0);
|
|
frameWordCounter_i : in std_logic_vector(1 downto 0);
|
|
frameWordCounter_o : out std_logic_vector(1 downto 0);
|
|
frameContent_i : in std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
frameContent_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
crc_i : in std_logic_vector(15 downto 0);
|
|
crc_o : out std_logic_vector(15 downto 0);
|
|
|
-- Frame buffering interface.
|
-- Frame buffering interface.
|
writeFrameFull_i : in std_logic;
|
writeFrameFull_i : in std_logic;
|
writeFrame_o : out std_logic;
|
writeFrame_o : out std_logic;
|
writeFrameAbort_o : out std_logic;
|
writeFrameAbort_o : out std_logic;
|
writeContent_o : out std_logic;
|
writeContent_o : out std_logic;
|
writeContentData_o : out std_logic_vector(31 downto 0));
|
writeContentWords_o : out std_logic_vector(1 downto 0);
|
|
writeContentData_o : out std_logic_vector(32*NUMBER_WORDS-1 downto 0));
|
end entity;
|
end entity;
|
|
|
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
--
|
--
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
architecture RioReceiverImpl of RioReceiver is
|
architecture RioReceiverCoreImpl of RioReceiverCore is
|
|
|
component Crc5ITU is
|
component Crc5ITU is
|
port(
|
port(
|
d_i : in std_logic_vector(18 downto 0);
|
d_i : in std_logic_vector(18 downto 0);
|
crc_o : out std_logic_vector(4 downto 0));
|
crc_o : out std_logic_vector(4 downto 0));
|
| Line 1630... |
Line 2031... |
d_i : in std_logic_vector(15 downto 0);
|
d_i : in std_logic_vector(15 downto 0);
|
crc_i : in std_logic_vector(15 downto 0);
|
crc_i : in std_logic_vector(15 downto 0);
|
crc_o : out std_logic_vector(15 downto 0));
|
crc_o : out std_logic_vector(15 downto 0));
|
end component;
|
end component;
|
|
|
type StateType is (STATE_UNINITIALIZED, STATE_PORT_INITIALIZED,
|
signal symbolEnable0, symbolEnable1 : std_logic;
|
STATE_NORMAL,
|
signal symbolType0 : std_logic_vector(1 downto 0);
|
STATE_INPUT_RETRY_STOPPED, STATE_INPUT_ERROR_STOPPED);
|
signal symbolContent0, symbolContent1 : std_logic_vector(31 downto 0);
|
signal state : StateType;
|
signal crc5Valid : std_logic;
|
|
|
signal statusCounter : natural range 0 to 8;
|
|
|
|
signal ackId : unsigned(4 downto 0);
|
|
signal frameIndex : natural range 0 to 70;
|
|
|
|
signal stype0 : std_logic_vector(2 downto 0);
|
|
signal parameter0 : std_logic_vector(4 downto 0);
|
|
signal parameter1 : std_logic_vector(4 downto 0);
|
|
signal stype1 : std_logic_vector(2 downto 0);
|
|
signal cmd : std_logic_vector(2 downto 0);
|
|
|
|
signal crc5 : std_logic_vector(4 downto 0);
|
signal crc5 : std_logic_vector(4 downto 0);
|
signal crc5Calculated : std_logic_vector(4 downto 0);
|
|
|
|
signal crc16Valid : std_logic;
|
signal symbolValid : std_logic;
|
|
signal stype0Status : std_logic;
|
|
signal stype1Start : std_logic;
|
|
signal stype1End : std_logic;
|
|
signal stype1Stomp : std_logic;
|
|
signal stype1Restart : std_logic;
|
|
signal stype1LinkRequest : std_logic;
|
|
signal symbolData : std_logic;
|
|
|
signal crc16Data : std_logic_vector(31 downto 0);
|
signal crc16Data : std_logic_vector(31 downto 0);
|
signal crc16Current : std_logic_vector(15 downto 0);
|
signal crc16Current : std_logic_vector(15 downto 0);
|
signal crc16Temp : std_logic_vector(15 downto 0);
|
signal crc16Temp : std_logic_vector(15 downto 0);
|
signal crc16Next : std_logic_vector(15 downto 0);
|
signal crc16Next : std_logic_vector(15 downto 0);
|
|
signal crc16Valid : std_logic;
|
|
|
|
signal frameContent : std_logic_vector(32*NUMBER_WORDS-1 downto 0);
|
|
|
signal rxRead : std_logic;
|
signal rxControlWrite : std_logic;
|
|
signal rxControlSymbol : std_logic_vector(12 downto 0);
|
|
|
begin
|
begin
|
|
|
linkInitialized_o <= '0' when ((state = STATE_UNINITIALIZED) or
|
linkInitialized_o <= operational_i;
|
(state = STATE_PORT_INITIALIZED)) else '1';
|
ackIdStatus_o <= std_logic_vector(ackId_i);
|
ackIdStatus_o <= std_logic_vector(ackId);
|
inboundAckId_o <= std_logic_vector(ackId_i);
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- Get the entries in a control symbol.
|
-- First pipeline stage.
|
|
-- Check the validity of the symbol, CRC5 on control symbols, and save the
|
|
-- symbol content for the next stage.
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
stype0 <= rxData_i(31 downto 29);
|
-- Read the fifo immediatly.
|
parameter0 <= rxData_i(28 downto 24);
|
rxRead_o <= not rxEmpty_i;
|
parameter1 <= rxData_i(23 downto 19);
|
|
stype1 <= rxData_i(18 downto 16);
|
|
cmd <= rxData_i(15 downto 13);
|
|
crc5 <= rxData_i(12 downto 8);
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- Entity for CRC-5 calculation on control symbols according to the standard.
|
|
-----------------------------------------------------------------------------
|
|
|
|
Crc5Calculator: Crc5ITU
|
Crc5Calculator: Crc5ITU
|
port map(
|
port map(
|
d_i=>rxData_i(31 downto 13), crc_o=>crc5Calculated);
|
d_i=>rxData_i(31 downto 13), crc_o=>crc5);
|
|
|
-----------------------------------------------------------------------------
|
|
-- Entities for CRC-16 calculation on 32-bit data in frames according to the
|
|
-- standard.
|
|
-----------------------------------------------------------------------------
|
|
|
|
-- If the CRC is correct, there is either zero in crc16Next if no pad exists
|
process(clk, areset_n)
|
-- or zero in crc16Temp and crc16Data(15 downto 0). This means that crc16Next
|
begin
|
-- will always be zero here if the CRC is correct.
|
if (areset_n = '0') then
|
crc16Valid <= '1' when (crc16Next = x"0000") else '0';
|
crc5Valid <= '0';
|
|
symbolType0 <= (others => '0');
|
Crc16High: Crc16CITT
|
symbolContent0 <= (others => '0');
|
port map(
|
elsif (clk'event and clk = '1') then
|
d_i=>crc16Data(31 downto 16), crc_i=>crc16Current, crc_o=>crc16Temp);
|
if (rxEmpty_i = '0') then
|
Crc16Low: Crc16CITT
|
if (crc5 = rxData_i(12 downto 8)) then
|
port map(
|
crc5Valid <= '1';
|
d_i=>crc16Data(15 downto 0), crc_i=>crc16Temp, crc_o=>crc16Next);
|
else
|
|
crc5Valid <= '0';
|
|
end if;
|
|
symbolEnable0 <= '1';
|
|
symbolType0 <= rxType_i;
|
|
symbolContent0 <= rxData_i;
|
|
else
|
|
symbolEnable0 <= '0';
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- Main inbound symbol handler.
|
-- Second pipeline stage.
|
|
-- Separate the part of the control symbol that are going to the transmitter
|
|
-- side and check the type of symbol for this side.
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
rxRead_o <= rxRead;
|
|
inboundAckId_o <= std_logic_vector(ackId);
|
process(clk, areset_n)
|
process(areset_n, clk)
|
|
begin
|
begin
|
if (areset_n = '0') then
|
if (areset_n = '0') then
|
state <= STATE_UNINITIALIZED;
|
txControlWrite_o <= '0';
|
|
txControlSymbol_o <= (others => '0');
|
|
|
|
symbolValid <= '0';
|
|
stype0Status <= '0';
|
|
stype1Start <= '0';
|
|
stype1End <= '0';
|
|
stype1Stomp <= '0';
|
|
stype1Restart <= '0';
|
|
stype1LinkRequest <= '0';
|
|
symbolData <= '0';
|
|
|
rxRead <= '0';
|
symbolContent1 <= (others => '0');
|
|
elsif (clk'event and clk = '1') then
|
|
if (symbolEnable0 = '1') then
|
|
symbolEnable1 <= '1';
|
|
symbolContent1 <= symbolContent0;
|
|
|
|
if (symbolType0 = SYMBOL_CONTROL) then
|
|
if (crc5Valid = '1') then
|
|
-- REMARK: Check if stype0 is nop and dont forward it???
|
|
symbolValid <= '1';
|
|
txControlWrite_o <= '1';
|
|
txControlSymbol_o <= symbolContent0(31 downto 19);
|
|
else
|
|
symbolValid <= '0';
|
txControlWrite_o <= '0';
|
txControlWrite_o <= '0';
|
txControlSymbol_o <= (others => '0');
|
txControlSymbol_o <= (others => '0');
|
rxControlWrite_o <= '0';
|
end if;
|
rxControlSymbol_o <= (others => '0');
|
else
|
|
symbolValid <= '1';
|
|
end if;
|
|
|
writeFrame_o <= '0';
|
if ((symbolType0 = SYMBOL_CONTROL) and
|
writeFrameAbort_o <= '0';
|
(symbolContent0(31 downto 29) = STYPE0_STATUS)) then
|
writeContent_o <= '0';
|
stype0Status <= '1';
|
writeContentData_o <= (others => '0');
|
else
|
|
stype0Status <= '0';
|
|
end if;
|
|
if ((symbolType0 = SYMBOL_CONTROL) and
|
|
(symbolContent0(18 downto 16) = STYPE1_START_OF_PACKET)) then
|
|
stype1Start <= '1';
|
|
else
|
|
stype1Start <= '0';
|
|
end if;
|
|
if ((symbolType0 = SYMBOL_CONTROL) and
|
|
(symbolContent0(18 downto 16) = STYPE1_END_OF_PACKET)) then
|
|
stype1End <= '1';
|
|
else
|
|
stype1End <= '0';
|
|
end if;
|
|
if ((symbolType0 = SYMBOL_CONTROL) and
|
|
(symbolContent0(18 downto 16) = STYPE1_STOMP)) then
|
|
stype1Stomp <= '1';
|
|
else
|
|
stype1Stomp <= '0';
|
|
end if;
|
|
if ((symbolType0 = SYMBOL_CONTROL) and
|
|
(symbolContent0(18 downto 16) = STYPE1_RESTART_FROM_RETRY)) then
|
|
stype1Restart <= '1';
|
|
else
|
|
stype1Restart <= '0';
|
|
end if;
|
|
if ((symbolType0 = SYMBOL_CONTROL) and
|
|
(symbolContent0(18 downto 16) = STYPE1_LINK_REQUEST)) then
|
|
stype1LinkRequest <= '1';
|
|
else
|
|
stype1LinkRequest <= '0';
|
|
end if;
|
|
if (symbolType0 = SYMBOL_DATA) then
|
|
symbolData <= '1';
|
|
else
|
|
symbolData <= '0';
|
|
end if;
|
|
else
|
|
symbolEnable1 <= '0';
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
-- REMARK: Use frameIndex instead of this...
|
-----------------------------------------------------------------------------
|
statusCounter <= 0;
|
-- Third pipeline stage.
|
|
-- Update the CRC16 for the packet.
|
|
-- Update the buffered data and write it to the packet buffer if needed.
|
|
-- Update the main receiver state machine.
|
|
-- Generate reply symbols to the link-partner.
|
|
-- Note that this stage cannot contain any registers as it could be cascaded
|
|
-- to other cores.
|
|
-----------------------------------------------------------------------------
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- CRC-calculation.
|
|
-- Add a data symbol to the calculated CRC for the packet.
|
|
-- controlSymbol->just forward old crc16.
|
|
-- first data-symbol in packet->crc_o is product of 11111 and the
|
|
-- symbolContent1 without ackid.
|
|
-- not first data-symbol->crc_o is product of crc_i and symbolContent1.
|
|
-----------------------------------------------------------------------------
|
|
|
frameIndex <= 0;
|
crc16Data(31 downto 26) <= "000000" when (unsigned(frameIndex_i) = 1) else
|
ackId <= (others => '0');
|
symbolContent1(31 downto 26);
|
|
crc16Data(25 downto 0) <= symbolContent1(25 downto 0);
|
|
|
crc16Current <= (others => '0');
|
crc16Current <= crc_i when (unsigned(frameIndex_i) /= 1) else
|
crc16Data <= (others => '0');
|
(others => '1');
|
elsif (clk'event and clk = '1') then
|
|
rxRead <= '0';
|
|
|
|
txControlWrite_o <= '0';
|
Crc16Msb: Crc16CITT
|
rxControlWrite_o <= '0';
|
port map(
|
|
d_i=>crc16Data(31 downto 16), crc_i=>crc16Current, crc_o=>crc16Temp);
|
|
Crc16Lsb: Crc16CITT
|
|
port map(
|
|
d_i=>crc16Data(15 downto 0), crc_i=>crc16Temp, crc_o=>crc16Next);
|
|
|
writeFrame_o <= '0';
|
crc_o <= crc_i when (symbolData = '0') else
|
writeFrameAbort_o <= '0';
|
crc16Next;
|
writeContent_o <= '0';
|
|
|
|
-- Check if a locakAckIdWrite is active.
|
crc16Valid <= '1' when (crc_i = x"0000") else '0';
|
if (localAckIdWrite_i = '1') then
|
|
-- A localAckIdWrite is active.
|
|
-- Set ackId.
|
|
ackId <= unsigned(inboundAckId_i);
|
|
else
|
|
-- A localAckIdWrite is not active.
|
|
|
|
-- Act on the current state.
|
-----------------------------------------------------------------------------
|
case state is
|
-- Update buffered data.
|
|
-----------------------------------------------------------------------------
|
|
|
when STATE_UNINITIALIZED =>
|
-- Append the new symbol content to the end of the
|
-----------------------------------------------------------------------
|
-- current frame content if the symbol is a data symbol.
|
-- This state is entered at startup. A port that is not initialized
|
frameContentSingle:
|
-- should discard all received symbols.
|
if (NUMBER_WORDS = 1) generate
|
-----------------------------------------------------------------------
|
frameContent <= symbolContent1;
|
|
end generate;
|
|
frameContentMulti:
|
|
if (NUMBER_WORDS > 1) generate
|
|
frameContent <=
|
|
(frameContent_i((32*(NUMBER_WORDS-1))-1 downto 0) & symbolContent1) when (symbolData = '1') else
|
|
frameContent_i;
|
|
end generate;
|
|
|
|
-- Update outputs.
|
|
enable_o <= symbolEnable1;
|
|
frameContent_o <= frameContent;
|
|
writeContentData_o <= frameContent;
|
|
|
-- Check if the port is initialized.
|
-----------------------------------------------------------------------------
|
if (portInitialized_i = '0') then
|
-- Main inbound symbol handler.
|
-- Port not initialized.
|
-----------------------------------------------------------------------------
|
|
process(portInitialized_i, portEnable_i, writeFrameFull_i,
|
|
operational_i, ackId_i, frameIndex_i, frameWordCounter_i,
|
|
inputRetryStopped_i, inputErrorStopped_i,
|
|
symbolValid,
|
|
stype0Status,
|
|
stype1Start, stype1End, stype1Stomp, stype1Restart, stype1LinkRequest,
|
|
symbolData,
|
|
symbolContent1,
|
|
frameContent,
|
|
crc16Valid)
|
|
begin
|
|
operational_o <= operational_i;
|
|
ackId_o <= ackId_i;
|
|
frameIndex_o <= frameIndex_i;
|
|
frameWordCounter_o <= frameWordCounter_i;
|
|
inputRetryStopped_o <= inputRetryStopped_i;
|
|
inputErrorStopped_o <= inputErrorStopped_i;
|
|
|
-- Check if a new symbol is ready to be read.
|
rxControlWrite <= '0';
|
if (rxRead = '0') and (rxEmpty_i = '0') then
|
rxControlSymbol <= (others => '0');
|
-- New symbol ready.
|
|
-- Discard all received symbols in this state.
|
|
rxRead <= '1';
|
|
else
|
|
-- No new symbol ready to be read.
|
|
-- Dont do anything.
|
|
end if;
|
|
else
|
|
-- Port is initialized.
|
|
|
|
-- Go to the initialized state and reset the counters.
|
writeFrame_o <= '0';
|
state <= STATE_PORT_INITIALIZED;
|
writeFrameAbort_o <= '0';
|
statusCounter <= 0;
|
writeContent_o <= '0';
|
end if;
|
writeContentWords_o <= (others => '0');
|
|
|
when STATE_PORT_INITIALIZED =>
|
-- Act on the current state.
|
|
if (operational_i = '0') then
|
---------------------------------------------------------------------
|
---------------------------------------------------------------------
|
-- The port has been initialized and status control symbols are being
|
-- The port is not operational and is waiting for status control
|
-- received on the link to check if it is working. Count the number
|
-- symbols to be received on the link. Count the number
|
-- of error-free status symbols and considder the link initialized
|
-- of error-free status symbols and considder the link operational
|
-- when enough of them has been received. Frames are not allowed
|
-- when enough of them has been received. Frames are not allowed
|
-- here.
|
-- here.
|
---------------------------------------------------------------------
|
---------------------------------------------------------------------
|
|
|
-- Check if the port is initialized.
|
-- Check if the port is initialized.
|
if (portInitialized_i = '1') then
|
if (portInitialized_i = '1') then
|
-- Port is initialized.
|
-- Port is initialized.
|
|
|
-- Check if a new symbol is ready to be read.
|
|
if (rxRead = '0') and (rxEmpty_i = '0') then
|
|
-- There is a new symbol to read.
|
|
|
|
-- Check the type of symbol.
|
|
if (rxControl_i = SYMBOL_CONTROL) then
|
|
-- This is a control symbol that is not a packet delimiter.
|
|
|
|
-- Check if the control symbol has a valid checksum.
|
-- Check if the control symbol has a valid checksum.
|
if (crc5Calculated = crc5) then
|
if (symbolValid = '1') then
|
-- The control symbol has a valid checksum.
|
-- The control symbol has a valid checksum.
|
|
|
-- Forward the stype0 part of the symbol to the transmitter.
|
|
txControlWrite_o <= '1';
|
|
txControlSymbol_o <= stype0 & parameter0 & parameter1;
|
|
|
|
-- Check the stype0 part if we should count the number of
|
-- Check the stype0 part if we should count the number of
|
-- error-free status symbols.
|
-- error-free status symbols.
|
if (stype0 = STYPE0_STATUS) then
|
if (stype0Status = '1') then
|
-- The symbol is a status.
|
-- The symbol is a status.
|
|
|
-- Check if enough status symbols have been received.
|
-- Check if enough status symbols have been received.
|
if (statusCounter = 7) then
|
if (unsigned(frameIndex_i) = 7) then
|
-- Enough status symbols have been received.
|
-- Enough status symbols have been received.
|
|
|
-- Reset all packets.
|
-- Reset all packets.
|
frameIndex <= 0;
|
frameIndex_o <= (others => '0');
|
writeFrameAbort_o <= '1';
|
writeFrameAbort_o <= '1';
|
|
|
-- Set the link as initialized.
|
-- Set the link as initialized.
|
state <= STATE_NORMAL;
|
operational_o <= '1';
|
else
|
else
|
-- Increase the number of error-free status symbols that
|
-- Increase the number of error-free status symbols that
|
-- has been received.
|
-- has been received.
|
statusCounter <= statusCounter + 1;
|
frameIndex_o <= std_logic_vector(unsigned(frameIndex_i) + 1);
|
end if;
|
end if;
|
else
|
else
|
-- The symbol is not a status.
|
-- The symbol is not a status.
|
-- Dont do anything.
|
-- Dont do anything.
|
end if;
|
end if;
|
else
|
else
|
-- A control symbol with CRC5 error was recevied.
|
-- A control symbol with CRC5 error was recevied.
|
statusCounter <= 0;
|
frameIndex_o <= (others => '0');
|
end if;
|
end if;
|
else
|
else
|
-- Symbol that is not allowed in this state have been received.
|
-- The port has become uninitialized.
|
-- Discard it.
|
frameIndex_o <= (others => '0');
|
end if;
|
|
|
|
-- Update to the next symbol.
|
|
rxRead <= '1';
|
|
else
|
|
-- No new symbol ready to be read.
|
|
-- Dont do anything.
|
|
end if;
|
end if;
|
else
|
else
|
-- Go back to the uninitialized state.
|
|
state <= STATE_UNINITIALIZED;
|
|
end if;
|
|
|
|
when STATE_NORMAL =>
|
|
---------------------------------------------------------------------
|
---------------------------------------------------------------------
|
-- The port has been initialized and enough error free status symbols
|
-- The port has been initialized and enough error free status symbols
|
-- have been received. Forward data frames to the frame buffer
|
-- have been received. Forward data frames to the frame buffer
|
-- interface. This is the normal operational state.
|
-- interface. This is the normal operational state.
|
---------------------------------------------------------------------
|
---------------------------------------------------------------------
|
|
|
-- Check that the port is initialized.
|
-- Check that the port is initialized.
|
if (portInitialized_i = '1') then
|
if (portInitialized_i = '1') then
|
-- The port and link is initialized.
|
-- The port and link is initialized.
|
|
|
-- Check if a new symbol is ready to be read.
|
|
if (rxRead = '0') and (rxEmpty_i = '0') then
|
|
-- There is a new symbol to read.
|
|
|
|
-- Check the type of symbol.
|
|
if (rxControl_i = SYMBOL_CONTROL) then
|
|
-- This is a control symbol with or without a packet delimiter.
|
|
|
|
-- Check if the control symbol has a valid CRC-5.
|
-- Check if the control symbol has a valid CRC-5.
|
if (crc5Calculated = crc5) then
|
if (symbolValid = '1') then
|
-- The control symbol is correct.
|
-- The symbol is correct.
|
|
|
-- Forward the stype0 part of the symbol to the transmitter.
|
|
txControlWrite_o <= '1';
|
|
txControlSymbol_o <= stype0 & parameter0 & parameter1;
|
|
|
|
-- Check the stype1 part.
|
if ((stype1Start = '1') and
|
case stype1 is
|
(inputRetryStopped_i = '0') and (inputErrorStopped_i = '0')) then
|
|
|
when STYPE1_START_OF_PACKET =>
|
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- Start the reception of a new frame or end a currently
|
-- Start the reception of a new frame or end a currently
|
-- ongoing frame.
|
-- ongoing frame and start a new one.
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
|
|
-- Check if a frame has already been started.
|
-- Check if a frame has already been started.
|
if (frameIndex /= 0) then
|
if (unsigned(frameIndex_i) /= 0) then
|
-- A frame is already started.
|
-- A frame is already started.
|
-- Complete the last frame and start to ackumulate a new one
|
-- Complete the last frame and start to ackumulate a new one
|
-- and update the ackId.
|
-- and update the ackId.
|
|
|
|
if (unsigned(frameIndex_i) > 3) then
|
|
|
|
-- Reset the frame index to indicate the frame is started.
|
|
frameIndex_o <= "0000001";
|
|
frameWordCounter_o <= (others=>'0');
|
|
|
-- Check the CRC-16 and the length of the received frame.
|
-- Check the CRC-16 and the length of the received frame.
|
if (crc16Valid = '1') and (frameIndex > 3) then
|
if (crc16Valid = '1') then
|
-- The CRC-16 is ok.
|
-- The CRC-16 is ok.
|
|
|
-- Reset the frame index to indicate the frame is started.
|
-- Check if there are any unwritten buffered packet content
|
frameIndex <= 1;
|
-- and write it if there is.
|
|
-- REMARK: Multi-symbol support...
|
|
if (unsigned(frameWordCounter_i) /= 0) then
|
|
writeContent_o <= '1';
|
|
end if;
|
|
|
-- Update the frame buffer to indicate that the frame has
|
-- Update the frame buffer to indicate that the frame has
|
-- been completly received.
|
-- been completly received.
|
writeFrame_o <= '1';
|
writeFrame_o <= '1';
|
|
|
-- Update ackId.
|
-- Update ackId.
|
ackId <= ackId + 1;
|
ackId_o <= ackId_i + 1;
|
|
|
-- Send packet-accepted.
|
-- Send packet-accepted.
|
-- The buffer status is appended by the transmitter
|
-- The buffer status is appended by the transmitter
|
-- when sent to get the latest number.
|
-- when sent to get the latest number.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_ACCEPTED & std_logic_vector(ackId) & "11111";
|
rxControlSymbol <= STYPE0_PACKET_ACCEPTED &
|
|
std_logic_vector(ackId_i) &
|
|
"11111";
|
else
|
else
|
-- The CRC-16 is not ok.
|
-- The CRC-16 is not ok.
|
|
|
-- Make the transmitter send a packet-not-accepted to indicate
|
-- Make the transmitter send a packet-not-accepted to indicate
|
-- that the received packet contained a CRC error.
|
-- that the received packet contained a CRC error.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_NOT_ACCEPTED &
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
"00000" &
|
"00000" &
|
PACKET_NOT_ACCEPTED_CAUSE_PACKET_CRC;
|
PACKET_NOT_ACCEPTED_CAUSE_PACKET_CRC;
|
state <= STATE_INPUT_ERROR_STOPPED;
|
inputErrorStopped_o <= '1';
|
|
end if;
|
|
else
|
|
-- This packet is too small.
|
|
-- Make the transmitter send a packet-not-accepted to indicated
|
|
-- that the received packet was too small.
|
|
rxControlWrite <= '1';
|
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
|
"00000" &
|
|
PACKET_NOT_ACCEPTED_CAUSE_GENERAL_ERROR;
|
|
inputErrorStopped_o <= '1';
|
end if;
|
end if;
|
else
|
else
|
-- No frame has been started.
|
-- No frame has been started.
|
|
|
-- Reset the frame index to indicate the frame is started.
|
-- Reset the frame index to indicate the frame is started.
|
frameIndex <= 1;
|
frameIndex_o <= "0000001";
|
|
frameWordCounter_o <= (others=>'0');
|
|
end if;
|
end if;
|
end if;
|
|
|
when STYPE1_END_OF_PACKET =>
|
if ((stype1End = '1') and
|
|
(inputRetryStopped_i = '0') and (inputErrorStopped_i = '0')) then
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- End the reception of an old frame.
|
-- End the reception of an old frame.
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
|
|
|
-- Check if a frame has already been started.
|
|
if (unsigned(frameIndex_i) > 3) then
|
|
-- A frame has been started and it is large enough.
|
|
|
|
-- Reset frame reception to indicate that no frame is ongoing.
|
|
frameIndex_o <= (others => '0');
|
|
|
-- Check the CRC-16 and the length of the received frame.
|
-- Check the CRC-16 and the length of the received frame.
|
if (crc16Valid = '1') and (frameIndex > 3) then
|
if (crc16Valid = '1') then
|
-- The CRC-16 is ok.
|
-- The CRC-16 is ok.
|
|
|
-- Reset frame reception to indicate that no frame is ongoing.
|
-- Check if there are any unwritten buffered packet content
|
frameIndex <= 0;
|
-- and write it if there is.
|
|
-- REMARK: Multi-symbol support...
|
|
if (unsigned(frameWordCounter_i) /= 0) then
|
|
writeContent_o <= '1';
|
|
end if;
|
|
|
-- Update the frame buffer to indicate that the frame has
|
-- Update the frame buffer to indicate that the frame has
|
-- been completly received.
|
-- been completly received.
|
writeFrame_o <= '1';
|
writeFrame_o <= '1';
|
|
|
-- Update ackId.
|
-- Update ackId.
|
ackId <= ackId + 1;
|
ackId_o <= ackId_i + 1;
|
|
|
-- Send packet-accepted.
|
-- Send packet-accepted.
|
-- The buffer status is appended by the transmitter
|
-- The buffer status is appended by the transmitter
|
-- when sent to get the latest number.
|
-- when sent to get the latest number.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_ACCEPTED & std_logic_vector(ackId) & "11111";
|
rxControlSymbol <= STYPE0_PACKET_ACCEPTED &
|
|
std_logic_vector(ackId_i) &
|
|
"11111";
|
else
|
else
|
-- The CRC-16 is not ok.
|
-- The CRC-16 is not ok.
|
|
|
-- Make the transmitter send a packet-not-accepted to indicate
|
-- Make the transmitter send a packet-not-accepted to indicate
|
-- that the received packet contained a CRC error.
|
-- that the received packet contained a CRC error.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_NOT_ACCEPTED &
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
"00000" &
|
"00000" &
|
PACKET_NOT_ACCEPTED_CAUSE_PACKET_CRC;
|
PACKET_NOT_ACCEPTED_CAUSE_PACKET_CRC;
|
state <= STATE_INPUT_ERROR_STOPPED;
|
inputErrorStopped_o <= '1';
|
|
end if;
|
|
else
|
|
-- This packet is too small.
|
|
-- Make the transmitter send a packet-not-accepted to indicate
|
|
-- that the received packet was too small.
|
|
rxControlWrite <= '1';
|
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
|
"00000" &
|
|
PACKET_NOT_ACCEPTED_CAUSE_GENERAL_ERROR;
|
|
inputErrorStopped_o <= '1';
|
|
end if;
|
end if;
|
end if;
|
|
|
when STYPE1_STOMP =>
|
if ((stype1Stomp = '1') and
|
|
(inputRetryStopped_i = '0') and (inputErrorStopped_i = '0')) then
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- Restart the reception of an old frame.
|
-- Restart the reception of an old frame.
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- See 5.10 in the standard.
|
-- See 5.10 in the standard.
|
|
|
-- Make the transmitter send a packet-retry to indicate
|
-- Make the transmitter send a packet-retry to indicate
|
-- that the packet cannot be accepted.
|
-- that the packet cannot be accepted.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_RETRY & std_logic_vector(ackId) & "11111";
|
rxControlSymbol <= STYPE0_PACKET_RETRY &
|
|
std_logic_vector(ackId_i) &
|
|
"11111";
|
|
|
-- Enter the input retry-stopped state.
|
-- Enter the input retry-stopped state.
|
state <= STATE_INPUT_RETRY_STOPPED;
|
inputRetryStopped_o <= '1';
|
|
end if;
|
|
|
|
if (stype1Restart = '1') then
|
|
if (inputRetryStopped_i = '1') then
|
|
-------------------------------------------------------------
|
|
-- The receiver indicates a restart from a retry sent
|
|
-- from us.
|
|
-------------------------------------------------------------
|
|
|
|
-- Abort the frame and reset frame reception.
|
|
frameIndex_o <= (others => '0');
|
|
writeFrameAbort_o <= '1';
|
|
|
when STYPE1_RESTART_FROM_RETRY =>
|
-- Go back to the normal operational state.
|
|
inputRetryStopped_o <= '0';
|
|
else
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- The receiver indicates a restart from a retry sent
|
-- The receiver indicates a restart from a retry sent
|
-- from us.
|
-- from us.
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- See 5.10 in the standard.
|
-- See 5.10 in the standard.
|
-- Protocol error, this symbol should not be received here since
|
-- Protocol error, this symbol should not be received here since
|
-- we should have been in input-retry-stopped.
|
-- we should have been in input-retry-stopped.
|
|
|
-- Send a packet-not-accepted to indicate that a protocol
|
-- Send a packet-not-accepted to indicate that a protocol
|
-- error has occurred.
|
-- error has occurred.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_NOT_ACCEPTED &
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
"00000" &
|
"00000" &
|
PACKET_NOT_ACCEPTED_CAUSE_GENERAL_ERROR;
|
PACKET_NOT_ACCEPTED_CAUSE_GENERAL_ERROR;
|
state <= STATE_INPUT_ERROR_STOPPED;
|
inputErrorStopped_o <= '1';
|
|
end if;
|
|
end if;
|
|
|
when STYPE1_LINK_REQUEST =>
|
if (stype1LinkRequest = '1') then
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- Reply to a LINK-REQUEST.
|
-- Reply to a LINK-REQUEST.
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
|
|
-- Check the command part.
|
-- Check the command part.
|
if (cmd = "100") then
|
if (symbolContent1(15 downto 13) = "100") then
|
-- Return input port status command.
|
-- Return input port status command.
|
-- This functions as a link-request(restart-from-error)
|
-- This functions as a link-request(restart-from-error)
|
-- control symbol under error situations.
|
-- control symbol under error situations.
|
|
|
|
if (inputErrorStopped_i = '1') then
|
|
rxControlWrite <= '1';
|
|
rxControlSymbol <= STYPE0_LINK_RESPONSE &
|
|
std_logic_vector(ackId_i) &
|
|
"00101";
|
|
elsif (inputRetryStopped_i = '1') then
|
|
rxControlWrite <= '1';
|
|
rxControlSymbol <= STYPE0_LINK_RESPONSE &
|
|
std_logic_vector(ackId_i) &
|
|
"00100";
|
|
else
|
-- Send a link response containing an ok reply.
|
-- Send a link response containing an ok reply.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_LINK_RESPONSE & std_logic_vector(ackId) & "10000";
|
rxControlSymbol <= STYPE0_LINK_RESPONSE &
|
elsif (cmd = "011") then
|
std_logic_vector(ackId_i) &
|
-- Reset device command.
|
"10000";
|
-- Discard this.
|
end if;
|
else
|
else
|
-- Unsupported command.
|
-- Reset device command or other unsupported command.
|
-- Discard this.
|
-- Discard this.
|
end if;
|
end if;
|
|
|
-- Abort the frame and reset frame reception.
|
-- Abort the frame and reset frame reception.
|
frameIndex <= 0;
|
inputRetryStopped_o <= '0';
|
|
inputErrorStopped_o <= '0';
|
|
frameIndex_o <= (others=>'0');
|
writeFrameAbort_o <= '1';
|
writeFrameAbort_o <= '1';
|
|
end if;
|
|
|
when STYPE1_MULTICAST_EVENT =>
|
if ((symbolData = '1') and
|
-------------------------------------------------------------
|
(inputRetryStopped_i = '0') and (inputErrorStopped_i = '0')) then
|
-- Multicast symbol.
|
|
-------------------------------------------------------------
|
|
-- Discard the symbol.
|
|
|
|
when STYPE1_RESERVED =>
|
|
-------------------------------------------------------------
|
|
-- Reserved.
|
|
-------------------------------------------------------------
|
|
-- Not supported, dont do anything.
|
|
|
|
when STYPE1_NOP =>
|
|
-------------------------------------------------------------
|
|
-- NOP, no operation.
|
|
-------------------------------------------------------------
|
|
-- Dont do anything.
|
|
|
|
when others =>
|
|
-------------------------------------------------------------
|
|
--
|
|
-------------------------------------------------------------
|
-------------------------------------------------------------
|
-- NOP, no operation, dont do anything.
|
|
null;
|
|
|
|
end case;
|
|
else
|
|
-- The control symbol contains a crc error.
|
|
|
|
-- Send a packet-not-accepted to indicate that a corrupted
|
|
-- control-symbol has been received and change state.
|
|
rxControlWrite_o <= '1';
|
|
rxControlSymbol_o <= STYPE0_PACKET_NOT_ACCEPTED &
|
|
"00000" &
|
|
PACKET_NOT_ACCEPTED_CAUSE_CONTROL_CRC;
|
|
state <= STATE_INPUT_ERROR_STOPPED;
|
|
end if;
|
|
elsif (rxControl_i = SYMBOL_DATA) then
|
|
-- This is a data symbol.
|
-- This is a data symbol.
|
|
-------------------------------------------------------------
|
-- REMARK: Add check for in-the-middle-crc here...
|
-- REMARK: Add check for in-the-middle-crc here...
|
|
|
-- Check if a frame has been started.
|
case frameIndex_i is
|
-- Index=0 not started
|
when "0000000" | "1000110" =>
|
-- index=1 started and expecting to receive the first data.
|
-- A frame has not been started or is too long.
|
-- index=others, the index of the received data.
|
-- Send packet-not-accepted.
|
if (frameIndex /= 0) and (frameIndex /= 70) then
|
rxControlWrite <= '1';
|
-- A frame has been started and is not too long.
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
|
"00000" &
|
-- Check if the ackId is correct.
|
PACKET_NOT_ACCEPTED_CAUSE_GENERAL_ERROR;
|
if (((frameIndex = 1) and (unsigned(rxData_i(31 downto 27)) = ackId)) or
|
inputErrorStopped_o <= '1';
|
(frameIndex /= 1)) then
|
when "0000001" =>
|
-- This is the first data symbol containing the ackId which
|
if (unsigned(symbolContent1(31 downto 27)) = ackId_i) then
|
-- is matching or receiving the rest of the frame.
|
if ((portEnable_i = '1') or
|
|
(symbolContent1(19 downto 16) = FTYPE_MAINTENANCE_CLASS)) then
|
-- Check if the packet ftype is allowed.
|
|
-- If the portEnable is deasserted only maintenance
|
|
-- packets are allowed.
|
|
if (((frameIndex = 1) and
|
|
((portEnable_i = '1') or (rxData_i(19 downto 16) = FTYPE_MAINTENANCE_CLASS))) or
|
|
(frameIndex /= 1)) then
|
|
-- The packet is allowed.
|
|
|
|
-- Check if there is buffers available to store the new packet.
|
-- Check if there are buffers available to store the new
|
|
-- packet.
|
if(writeFrameFull_i = '0') then
|
if(writeFrameFull_i = '0') then
|
-- There is buffering space available to store the new data.
|
-- There are buffering space available to store the new
|
|
-- data.
|
|
|
|
-- Check if the buffer entry is ready to be written
|
|
-- into the packet buffer.
|
|
-- REMARK: Multi-symbol support...
|
|
if (unsigned(frameWordCounter_i) = (NUMBER_WORDS-1)) then
|
-- Write the data to the frame FIFO.
|
-- Write the data to the frame FIFO.
|
|
frameWordCounter_o <= (others=>'0');
|
writeContent_o <= '1';
|
writeContent_o <= '1';
|
writeContentData_o <= rxData_i;
|
writeContentWords_o <= frameWordCounter_i;
|
|
|
-- Increment the number of received data symbols.
|
|
frameIndex <= frameIndex + 1;
|
|
|
|
-- Update the saved crc result with the output from the CRC calculation.
|
|
if (frameIndex = 1) then
|
|
-- Note that the ackId should not be included when the CRC
|
|
-- is calculated.
|
|
crc16Data <= "000000" & rxData_i(25 downto 0);
|
|
crc16Current <= (others => '1');
|
|
else
|
else
|
crc16Data <= rxData_i;
|
frameWordCounter_o <= std_logic_vector(unsigned(frameWordCounter_i) + 1);
|
crc16Current <= crc16Next;
|
|
end if;
|
end if;
|
|
|
|
-- Increment the number of received data symbols.
|
|
frameIndex_o <= std_logic_vector(unsigned(frameIndex_i) + 1);
|
else
|
else
|
-- The packet buffer is full.
|
-- The packet buffer is full.
|
-- Let the link-partner resend the packet.
|
-- Let the link-partner resend the packet.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_RETRY & std_logic_vector(ackId) & "11111";
|
rxControlSymbol <= STYPE0_PACKET_RETRY &
|
state <= STATE_INPUT_RETRY_STOPPED;
|
std_logic_vector(ackId_i) &
|
|
"11111";
|
|
inputRetryStopped_o <= '1';
|
end if;
|
end if;
|
else
|
else
|
-- The non-maintenance packets are not allowed.
|
-- A non-maintenance packets are not allowed.
|
-- Send packet-not-accepted.
|
-- Send packet-not-accepted.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <=
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
STYPE0_PACKET_NOT_ACCEPTED & "00000" & PACKET_NOT_ACCEPTED_CAUSE_NON_MAINTENANCE_STOPPED;
|
"00000" &
|
state <= STATE_INPUT_ERROR_STOPPED;
|
PACKET_NOT_ACCEPTED_CAUSE_NON_MAINTENANCE_STOPPED;
|
|
inputErrorStopped_o <= '1';
|
end if;
|
end if;
|
else
|
else
|
-- The ackId is unexpected.
|
-- The ackId is unexpected.
|
-- Send packet-not-accepted.
|
-- Send packet-not-accepted.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <=
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
STYPE0_PACKET_NOT_ACCEPTED & "00000" & PACKET_NOT_ACCEPTED_CAUSE_UNEXPECTED_ACKID;
|
"00000" &
|
state <= STATE_INPUT_ERROR_STOPPED;
|
PACKET_NOT_ACCEPTED_CAUSE_UNEXPECTED_ACKID;
|
end if;
|
inputErrorStopped_o <= '1';
|
else
|
|
-- A frame has not been started or is too long.
|
|
-- Send packet-not-accepted.
|
|
rxControlWrite_o <= '1';
|
|
rxControlSymbol_o <= STYPE0_PACKET_NOT_ACCEPTED & "00000" & PACKET_NOT_ACCEPTED_CAUSE_GENERAL_ERROR;
|
|
state <= STATE_INPUT_ERROR_STOPPED;
|
|
end if;
|
|
else
|
|
-- Idle sequence received.
|
|
-- Discard these.
|
|
end if;
|
|
|
|
-- Update to the next symbol.
|
|
rxRead <= '1';
|
|
else
|
|
-- No new symbol received.
|
|
-- Dont do anything.
|
|
end if;
|
|
else
|
|
-- The port has become uninitialized.
|
|
-- Go back to the uninitialized state.
|
|
state <= STATE_UNINITIALIZED;
|
|
end if;
|
end if;
|
|
when others =>
|
when STATE_INPUT_RETRY_STOPPED =>
|
-- A frame has been started and is not too long.
|
---------------------------------------------------------------------
|
-- Check if the buffer entry is ready to be written
|
-- This state is entered when a frame could not be accepted. All
|
-- into the packet buffer.
|
-- symbols except restart-from-retry and link-request are discarded.
|
-- REMARK: Multi-symbol support...
|
-- A restart-from-retry triggers a state change into the normal
|
if (unsigned(frameWordCounter_i) = (NUMBER_WORDS-1)) then
|
-- link-initialized state.
|
-- Write the data to the frame FIFO.
|
---------------------------------------------------------------------
|
frameWordCounter_o <= (others=>'0');
|
|
writeContent_o <= '1';
|
-- Check that the port is initialized.
|
writeContentWords_o <= frameWordCounter_i;
|
if (portInitialized_i = '1') then
|
|
-- The port and link is initialized.
|
|
|
|
-- Check if a new symbol is ready to be read.
|
|
if (rxRead = '0') and (rxEmpty_i = '0') then
|
|
-- There is a new symbol to read.
|
|
|
|
-- Check the type of symbol.
|
|
if (rxControl_i = SYMBOL_CONTROL) then
|
|
-- This is a control symbol with or without a packet delimiter.
|
|
|
|
-- Check if the control symbol has a valid CRC-5.
|
|
if (crc5Calculated = crc5) then
|
|
-- The control symbol is correct.
|
|
|
|
-- Forward the stype0 part of the symbol to the transmitter.
|
|
txControlWrite_o <= '1';
|
|
txControlSymbol_o <= stype0 & parameter0 & parameter1;
|
|
|
|
-- Check the stype1 part.
|
|
case stype1 is
|
|
|
|
when STYPE1_RESTART_FROM_RETRY =>
|
|
-------------------------------------------------------------
|
|
-- The receiver indicates a restart from a retry sent
|
|
-- from us.
|
|
-------------------------------------------------------------
|
|
|
|
-- Abort the frame and reset frame reception.
|
|
frameIndex <= 0;
|
|
writeFrameAbort_o <= '1';
|
|
|
|
-- Go back to the normal operational state.
|
|
state <= STATE_NORMAL;
|
|
|
|
when STYPE1_LINK_REQUEST =>
|
|
-------------------------------------------------------------
|
|
-- Received a link-request.
|
|
-------------------------------------------------------------
|
|
|
|
-- Check the command part.
|
|
if (cmd = "100") then
|
|
-- Return input port status command.
|
|
-- This functions as a link-request(restart-from-error)
|
|
-- control symbol under error situations.
|
|
|
|
-- Send a link response containing an ok reply.
|
|
rxControlWrite_o <= '1';
|
|
rxControlSymbol_o <= STYPE0_LINK_RESPONSE & std_logic_vector(ackId) & "00100";
|
|
elsif (cmd = "011") then
|
|
-- Reset device command.
|
|
-- Discard this.
|
|
else
|
else
|
-- Unsupported command.
|
frameWordCounter_o <= std_logic_vector(unsigned(frameWordCounter_i) + 1);
|
-- Discard this.
|
|
end if;
|
end if;
|
|
|
-- Abort the frame and reset frame reception.
|
-- Increment the number of received data symbols.
|
frameIndex <= 0;
|
frameIndex_o <= std_logic_vector(unsigned(frameIndex_i) + 1);
|
writeFrameAbort_o <= '1';
|
|
|
|
-- Go back to the normal operational state.
|
|
state <= STATE_NORMAL;
|
|
|
|
when others =>
|
|
-------------------------------------------------------------
|
|
--
|
|
-------------------------------------------------------------
|
|
-- Discard other control symbols.
|
|
null;
|
|
|
|
end case;
|
end case;
|
|
end if;
|
else
|
else
|
-- The control symbol contains a crc error.
|
-- A control symbol contains a crc error.
|
|
|
-- Send a packet-not-accepted to indicate that a corrupted
|
-- Send a packet-not-accepted to indicate that a corrupted
|
-- control-symbol has been received and change state.
|
-- control-symbol has been received and change state.
|
rxControlWrite_o <= '1';
|
rxControlWrite <= '1';
|
rxControlSymbol_o <= STYPE0_PACKET_NOT_ACCEPTED &
|
rxControlSymbol <= STYPE0_PACKET_NOT_ACCEPTED &
|
"00000" &
|
"00000" &
|
PACKET_NOT_ACCEPTED_CAUSE_CONTROL_CRC;
|
PACKET_NOT_ACCEPTED_CAUSE_CONTROL_CRC;
|
state <= STATE_INPUT_ERROR_STOPPED;
|
inputErrorStopped_o <= '1';
|
end if;
|
|
elsif (rxControl_i = SYMBOL_DATA) then
|
|
-- This is a data symbol.
|
|
-- Discard all data symbols in this state.
|
|
else
|
|
-- Idle sequence received.
|
|
-- Discard other symbols.
|
|
end if;
|
|
|
|
-- Update to the next symbol.
|
|
rxRead <= '1';
|
|
else
|
|
-- No new symbol received.
|
|
-- Dont do anything.
|
|
end if;
|
end if;
|
else
|
else
|
-- The port has become uninitialized.
|
-- The port has become uninitialized.
|
-- Go back to the uninitialized state.
|
-- Go back to the uninitialized state.
|
state <= STATE_UNINITIALIZED;
|
operational_o <= '0';
|
end if;
|
|
|
|
when STATE_INPUT_ERROR_STOPPED =>
|
|
---------------------------------------------------------------------
|
|
-- This state is entered when an error situation has occurred. When in this
|
|
-- state, all symbols should be discarded until a link-request-symbols has
|
|
-- been received. See section 5.13.2.6 in part 6 of the standard.
|
|
-- Note that it is only the input side of the port that are affected, not the
|
|
-- output side. Packets may still be transmitted and acknowledges should be
|
|
-- accepted.
|
|
---------------------------------------------------------------------
|
|
|
|
-- Check that the port is initialized.
|
|
if (portInitialized_i = '1') then
|
|
-- The port and link is initialized.
|
|
|
|
-- Check if a new symbol is ready to be read.
|
|
if (rxRead = '0') and (rxEmpty_i = '0') then
|
|
-- There is a new symbol to read.
|
|
|
|
-- Check the type of symbol.
|
|
if (rxControl_i = SYMBOL_CONTROL) then
|
|
-- This is a control symbol with or without a packet delimiter.
|
|
|
|
-- Check if the control symbol has a valid CRC-5.
|
|
if (crc5Calculated = crc5) then
|
|
-- The control symbol is correct.
|
|
|
|
-- Forward the stype0 part of the symbol to the transmitter.
|
|
txControlWrite_o <= '1';
|
|
txControlSymbol_o <= stype0 & parameter0 & parameter1;
|
|
|
|
-- Check the stype1 part.
|
|
case stype1 is
|
|
|
|
when STYPE1_LINK_REQUEST =>
|
|
-------------------------------------------------------------
|
|
-- Received a link-request.
|
|
-------------------------------------------------------------
|
|
|
|
-- Check the command part.
|
|
-- REMARK: Should also send a status-control-symbol
|
|
-- directly following this symbol...
|
|
if (cmd = "100") then
|
|
-- Return input port status command.
|
|
-- This functions as a link-request(restart-from-error)
|
|
-- control symbol under error situations.
|
|
|
|
-- Send a link response containing an ok reply.
|
|
rxControlWrite_o <= '1';
|
|
rxControlSymbol_o <= STYPE0_LINK_RESPONSE & std_logic_vector(ackId) & "00101";
|
|
elsif (cmd = "011") then
|
|
-- Reset device command.
|
|
-- Discard this.
|
|
else
|
|
-- Unsupported command.
|
|
-- Discard this.
|
|
end if;
|
|
|
|
-- Abort the frame and reset frame reception.
|
|
frameIndex <= 0;
|
|
writeFrameAbort_o <= '1';
|
|
|
|
-- Go back to the normal operational state.
|
|
state <= STATE_NORMAL;
|
|
|
|
when others =>
|
|
-------------------------------------------------------------
|
|
--
|
|
-------------------------------------------------------------
|
|
-- Discard other control symbols.
|
|
null;
|
|
|
|
end case;
|
|
else
|
|
-- The control symbol contains a crc error.
|
|
-- Error is ignored in this state.
|
|
end if;
|
end if;
|
else
|
|
-- Other symbol received.
|
|
-- All other symbols are discarded in this state.
|
|
end if;
|
end if;
|
|
end process;
|
|
|
-- Update to the next symbol.
|
-----------------------------------------------------------------------------
|
rxRead <= '1';
|
-- Fourth pipeline stage.
|
else
|
-----------------------------------------------------------------------------
|
-- No new symbol received.
|
-- REMARK: Do more stuff in this stage, convert a one-hot to the symbol to
|
-- Dont do anything.
|
-- send...
|
end if;
|
-- REMARK: Register other outputs here like writeContent_o...
|
else
|
|
-- The port has become uninitialized.
|
|
-- Go back to the uninitialized state.
|
|
state <= STATE_UNINITIALIZED;
|
|
end if;
|
|
|
|
when others =>
|
process(clk, areset_n)
|
---------------------------------------------------------------------
|
begin
|
--
|
if (areset_n = '0') then
|
---------------------------------------------------------------------
|
rxControlWrite_o <= '0';
|
null;
|
rxControlSymbol_o <= (others=>'0');
|
end case;
|
elsif (clk'event and clk = '1') then
|
end if;
|
rxControlWrite_o <= rxControlWrite and symbolEnable1;
|
|
rxControlSymbol_o <= rxControlSymbol;
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
end architecture;
|
end architecture;
|
|
|
| Line 2489... |
Line 2812... |
-- Reverse the bit vector indexes to make them the same as in the standard.
|
-- Reverse the bit vector indexes to make them the same as in the standard.
|
crc_o(4) <= c(0); crc_o(3) <= c(1); crc_o(2) <= c(2); crc_o(1) <= c(3);
|
crc_o(4) <= c(0); crc_o(3) <= c(1); crc_o(2) <= c(2); crc_o(1) <= c(3);
|
crc_o(0) <= c(4);
|
crc_o(0) <= c(4);
|
end architecture;
|
end architecture;
|
|
|
No newline at end of file
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No newline at end of file
|
|
|
|
-------------------------------------------------------------------------------
|
|
--
|
|
-------------------------------------------------------------------------------
|
|
library ieee;
|
|
use ieee.std_logic_1164.all;
|
|
use ieee.numeric_std.all;
|
|
use work.rio_common.all;
|
|
|
|
-------------------------------------------------------------------------------
|
|
--
|
|
-------------------------------------------------------------------------------
|
|
entity Crc16Calculator is
|
|
|
|
generic (
|
|
NUMBER_WORDS : natural range 1 to 8 := 1);
|
|
|
|
port (
|
|
clk : in std_logic;
|
|
areset_n : in std_logic;
|
|
|
|
write_i : in std_logic;
|
|
crc_i : in std_logic_vector(15 downto 0);
|
|
data_i : in std_logic_vector((32*NUMBER_WORDS)-1 downto 0);
|
|
|
|
crc_o : out std_logic_vector(15 downto 0);
|
|
done_o : out std_logic);
|
|
|
|
end Crc16Calculator;
|
|
|
|
-------------------------------------------------------------------------------
|
|
--
|
|
-------------------------------------------------------------------------------
|
|
architecture Crc16CalculatorImpl of Crc16Calculator is
|
|
|
|
component Crc16CITT is
|
|
port(
|
|
d_i : in std_logic_vector(15 downto 0);
|
|
crc_i : in std_logic_vector(15 downto 0);
|
|
crc_o : out std_logic_vector(15 downto 0));
|
|
end component;
|
|
|
|
signal iterator : natural range 0 to 2*NUMBER_WORDS;
|
|
signal crcData : std_logic_vector((32*NUMBER_WORDS)-1 downto 0);
|
|
signal crcCurrent : std_logic_vector(15 downto 0);
|
|
signal crcNext : std_logic_vector(15 downto 0);
|
|
|
|
begin
|
|
|
|
process(areset_n, clk)
|
|
begin
|
|
if (areset_n = '0') then
|
|
iterator <= 0;
|
|
done_o <= '0';
|
|
crc_o <= (others => '0');
|
|
elsif (clk'event and clk = '1') then
|
|
if (write_i = '1') then
|
|
iterator <= 2*NUMBER_WORDS-1;
|
|
crcData <= data_i;
|
|
crcCurrent <= crc_i;
|
|
done_o <= '0';
|
|
else
|
|
if (iterator /= 0) then
|
|
iterator <= iterator - 1;
|
|
crcData <= crcData(((32*NUMBER_WORDS)-1)-16 downto 0) & x"0000";
|
|
crcCurrent <= crcNext;
|
|
else
|
|
crc_o <= crcNext;
|
|
done_o <= '1';
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
|
Crc16Inst: Crc16CITT
|
|
port map(
|
|
d_i=>crcData((32*NUMBER_WORDS)-1 downto (32*NUMBER_WORDS)-16),
|
|
crc_i=>crcCurrent, crc_o=>crcNext);
|
|
|
|
end architecture;
|
|
|
|
|
No newline at end of file
|
No newline at end of file
|
