Device Command Layer Protocols

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UNH InterOperability Lab
SATA Chapters 11 and 12
Device Command Layer Protocols
Improving Networks Worldwide.
SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
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SATA Device Command Layer Protocols
Command Layer Protocols
• Series of inter-related state machines
• Guidelines for devices and hosts on
steps to take when processing and
incoming or outgoing command
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SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
4
SATA Device Command Layer Protocols
Power-on and COMRESET
• On reception of COMRESET from a
Host, devices shall execute the
hardware reset protocol regardless of
current device command layer state or
power management state
• Covers the basic power on procedures
to be used by both Packet and Nonpacket devices
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SATA Device Command Layer Protocols
Power-on and COMRESET
• DHR0: Hardware_reset_asserted
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Command Layer has received a
message from the Transport Layer
that a COMRESET has been asserted
Device stays in this state until message
from Phy State Machine is received
saying that the hardware reset has
been negated
Only transitions to DHR1
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SATA Device Command Layer Protocols
Power-on and COMRESET
• DHR1: Execute_diagnostics
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During this state, a Device initializes
its hardware and executes its power
up diagnostic routines
Upon completion of power up
diagnostic routines a Device can
transition to DHR2 or DHR3
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SATA Device Command Layer Protocols
Power-on and COMRESET
• DHR2: Send_good_status
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In this state, a Devices transmits a
Register FIS to the Host indicating that
the power up diagnostics have been
completed successfully
The Device then transitions to DI0:
Device_idle
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SATA Device Command Layer Protocols
Power-on and COMRESET
• DHR3: Send_bad_status
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In this state, a Devices transmits a
Register FIS to the Host indicating that
the power up diagnostics have NOT
been completed successfully
The Device then transitions to DI0:
Device_idle
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SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
10
SATA Device Command Layer Protocols
Device Idle Protocol
• The default state for all SATA Devices
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Awaiting the reception of a FIS from
the Host
State machine defines how to process
commands and how to decide which
command specific state machine to
enter based on the received FIS
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SATA Device Command Layer Protocols
Device Idle Protocol
• DI0: Device Idle
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Default State
Just waiting for something to happen
from the Host
Numerous possible transitions from
this state based on Host actions
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SATA Device Command Layer Protocols
Device Idle Protocol
• DI1: Check_FIS
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Entered from DI0 upon reception of a
FIS
Check C-bit and SRST-Bit of the FIS
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If C-bit asserted → DI2:
Check_command
If SRST-bit asserted → DSR0:
Software_reset_asserted
Any other FIS → DI0: Device_idle
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SATA Device Command Layer Protocols
Device Idle Protocol
• DI2: Check_command
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Check the fields of the command
15 possible transitions out of this state
based on the command type found
when checking fields
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SATA Device Command Layer Protocols
Device Idle Protocol
• DI3: No_Command
– Entered when a Device receives a
command not supported
– ABRT-bit of command set to one → DI0:
Device_idle
• DI4: Set_service
– Entered when Device is ready to
complete data transfer for a queued
command
– SERV-bit of command set to one → DI0:
Device_idle
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SATA Device Command Layer Protocols
Device Idle Protocol
• DI5: Service_test
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Entered when a SERVICE Command
is received
Check the command to see if a
Register FIS needs to be transmitted
for DRQ bit and to set the Tag
If PACKET PIO In/Out → DI7:
Service_decode
Else → DI6: Service_send_tag
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SATA Device Command Layer Protocols
Device Idle Protocol
• DI6: Service_send_tag
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Entered when a SERVICE command
has been received
Device waits for a Register FIS with
the BSY-bit de-asserted, DRQ-bit
asserted, and an appropriate tag
Upon reception of the FIS → DI7:
Service_decode
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SATA Device Command Layer Protocols
Device Idle Protocol
• DI7: Service_Decode
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Check the command that has been
received after the required Register
FIS has been received
6 Possible transitions based on the
command type
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SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
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SATA Device Command Layer Protocols
Execute Device Diagnostics Protocol
• Command Class for the EXECUTE
DEVICE DIAGNOSTIC command
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If COMRESET or a FIS with SRST-bit
asserted is received, the Device shall
execute the COMRESET Command
Protocol or the Software Reset
Command Protocol respectively
• Describes the process for EXECUTE
DEVICE DIAGNOSTIC command
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SATA Device Command Layer Protocols
Execute Device Diagnostics Protocol
• DEDD0: Execute_device_diag
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In this state, a Device will execute its
internal diagnostic procedures
• If diagnostics completed successfully →
DEDD1: Send_good_status
• Else → DEDD2: Send_bad_status
• From DEDD1 and DEDD2 → DI0:
Device_Idle
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SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
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SATA Device Command Layer Protocols
Device Reset Protocol
• Command Class for the DEVICE RESET
command
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If COMRESET or a FIS with SRST-bit
asserted is received, the Device shall
execute the COMRESET Command
Protocol or the Software Reset Command
Protocol respectively
• When this command is received, a Device will
stop all activity
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SATA Device Command Layer Protocols
Device Reset Protocol
• DDR0: Device_reset
– Upon reception of this command, a
Device will halt all execution of any
outstanding commands and will hald all
background activity
– When activity has ceased → DDR1:
Send_good_status
• DDR1: Send_good_status
– Device requests the Host transmit a
Register FIS
– Upon reception of this FIS → DI0:
Device_Idle
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SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
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SATA Device Command Layer Protocols
DMA Data-in Protocol
• Command Class for the READ DMA
and READ DMA EXT commands
• Execution of this command induces the transfer
of one ore more blocks of data from the device to
the host use using a DMA transfer
• Command Protocol for most read operations in
modern, non-packet devices
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SATA Device Command Layer Protocols
DMA Data-in Protocol
• DDMAI0: DMA_in
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In this state, a Device will prepare the
date for transfer to the host
When Data FIS is ready → DDMAI1:
Send_data
Otherwise, command has been
completed or aborted → DDMA2:
Send_status
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SATA Device Command Layer Protocols
DMA Data-in Protocol
• DDMAI1: Send_data
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In this state, the Device shall transmit
the prepared FIS to the host
• DDMAI2: Send_status
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A Device enters this state when all the
data for a command has been
transmitted to a Host or an error has
caused the command to abort
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SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• Command Class for READ FPDMA
QUEUED and WRITE FPDMA
QUEUED commands
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Special Read and Write commands for
Native Command Queuing features
found in SATA2+
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ1: AddCommandToQueue
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Upon determining a FPDMA
command has been received, a Device
will add the command to its internal
queue and store the command's TAG
value
Successful en-queuing →
DFPDMAQ2: CleareInterfaceBsy
Else → DFPDMAQ12:
BrokenHost_ClearBusy
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ2: ClearInterfaceBsy
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Transmit a Register FIS to the host
with BSY and DRQ bits deasserted,
indicating the Device is ready to
receive the next command
Upon transmission → DI0:
Device_idle
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ3: DataPhaseReadSetup
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State entered when the device is ready
to transmit data from a previously
queued READ FPDMA QUEUED
command
In this state, a Device will attempt to
setup up a host memory write DMA
connection with the Host
Once the connection is established, a
Device will transition to DFPDMAQ8
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ4: DataPhasePreWriteSetup
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State entered when the device is ready
to receive data from a previously
queued WRITE FPDMA QUEUED
command
In this state a Device needs to
determine if Auto-Activate is
supported an enabled
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If yes, → DFPDMAQ5:
DataPhase_WriteSetup
Else → DFPDMAQ6:
DatePahse_OldWriteSetup
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ5: DataPhase_WriteSetup
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This state is entered when a Device is
ready to Auto-Activate
A device transmits a DMA Setup FIS
to the host with a DMA buffer Id, the
queued TAG value, the direction bit
cleared (Host Memory Read), and the
AA bit set to one
Once Setup FIS is completed →
DFPDMAQ9: DataXmitWrite
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ6: DataPhase_OldWriteSetup
– This state is entered when Auto-Activate
is not supported or enabled
– A device transmits a DMA Setup FIS to
the host with a DMA buffer Id, the
queued TAG value, the direction bit
cleared (Host Memory Read), and the
AA bit set to zero
– Once Setup FIS is completed →
DFPDMAQ9: DataXmitWrite
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ7: DataPhaseXmit_Activate
– This state is entered after a device
completed setup for a WRITE
DPDMA QUEUED command
– While in this state a Device transmits a
DMA Activate FIS indicating its
readiness to receive DATA FISes
– The device then transitions to
DFPDMAQ9: DataXmitWrite
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ8: DataXmitRead
– This state is entered after a device has
completed setup for a READ FPDMA
QUEUED command
– A device continues to transmit Data
FISs until the command has been
completed or an error has been
encountered
– Device transitions to DI0: Device_idle
upon completion
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ9: DataXmitWrite
– This state is entered after a device has
completed setup for a WRITE FPDMA
QUEUED command
– A device continues to receive DATA
FISes until the command has been
completed or an error has been
encountered
– Device transitions to DI0: Device_idle
upon completetion
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ10: SendStatus
– This state is entered after a device has
completed the data transfer associated
with a command
– In this state, a device will transmit a
Set Device Bits FIS to the host
indicating the completion of the
command
– Following the transmission of this FIS,
a device will transition to DI0:
Device_idle
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ11: Error
– This state is entered when a device has
encountered an unrecoverable error
– When this state is entered, a device
halts all transmissions and transmits a
Set Device Bits FIS to the host
indictating the error condition
– A device then transitions to
DFPDMAQ13: WaitforClear
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ12: BrokenHost_ClearBusy
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This state is entered when a device receives a
READ or WRITE FPDMA QUEUED
command with a tag that exists already in
the queue or a non-queued command is
received while there are still outstanding
commands in the queue
Upon entering this state, a device will
transmit a Register FIS to the host indicating
the error condition and then transition to
DFPDMAQ13
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ13: WaitforClear
– This state is entered when a device has
transmitted an error FIS and is waiting
for a READ LOG EXT command or a
Soft-Reset
– All other commands will be
responded to with an Error FIS
– When the READ LOG EXT command
is received the device shall transition
to DFPDMAQ12
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SATA Device Command Layer Protocols
FPDMA Queued Protocol
• DFPDMAQ14: SendQueue_CleanACK
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This stae is entered when the Host has
responseded to an error FIS with a READ
LOG EXT command
The Device will discard all queued
commands remaining and transmit a Set
Device Bits FIS with the ERR bit cleared,
Error Field cleared, and Sactive = FFFFFFFFh
and interup cleared
Upon transmission of this FIS, the device
shall transition to DPIOI0:PIO_in
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SATA Device Command Layer Protocols
FPDMA Queued Protocol (Hosts)
• This state machine describes the behavior for
Native Command Queuing Hosts
• This class is largely similar to the behavior of
the devices but also covers:
– TAG assignment
– Error Recovery
– Retrying Failed Commands
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SATA Device Command Layer Protocols
Presentation Topics
• Device Command Layer Protocol
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Power-on and COMRESET
Device Idle
EXECUTE DEVICE DIAGNOSITC
DEVICE RESET
DMA data-in
FPDMA QUEUED (Host and Device)
• Other Command Layer Protocols
46
SATA Device Command Layer Protocols
Software Reset Protocol
• This state machine covers how a device
handles receiving a FIS with the SRST bit
asserted
• Essentially the same as the DEVICE RESET
Command Protocol
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SATA Device Command Layer Protocols
Non-Data Protocol
• This state machine describes how a device
will handle receiving a non-data command
FIS
• Commands include: FLUSH CACHE, IDLE,
MEDIA LOCK, SEEK, NOP, and SET
MULTIPLE MODE among others
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SATA Device Command Layer Protocols
PIO Data-in and Data-out Protocol
• These two state machines describe how
commands will responds to PIO requests
(Diagnostic and legacy commands from
previous ATA standards)
• Commands include IDENTIFY DEVICE,
READ SECTORS, SMART READ DATA,
DOWNLOAD MICROCODE, and WRITE
SECTORS among others
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SATA Device Command Layer Protocols
Packet Protocol
• This state machine describes how a device
will handle receiving a packet based
commands. Packet commands are used by
Optical Disc Drives and other ATAPI device
which do not utilize the traditional PIO and
DMA interfaces defined with ATA
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