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From coffin@ROCKY2.ROCKEFELLER.EDU Thu Mar 22 08:44:30 1990
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Subject: scsiDocs Part6 of 7
Date: Thu, 22 Mar 90 09:41:34 -0500
From: coffin@ROCKY2.ROCKEFELLER.EDU
.fo Section 10 #
10. Group 0 Command Descriptions for Printer Devices
The Group 0 commands for printer devices shall be as shown in Table 10-1.
Table 10-1
Group 0 Commands for Printer Devices
==============================================================================
Operation
Code Type Command Name Section
------------------------------------------------------------------------------
00H O TEST UNIT READY 7.1.1
01H V
02H V
03H M REQUEST SENSE 7.1.2
04H O FORMAT 10.1
05H V
06H V
07H V
08H V
09H V
0AH M PRINT 10.2
0BH O SLEW AND PRINT 10.3
0CH V
0DH V
0EH V
0FH V
10H O FLUSH BUFFER 10.4
11H V
12H E INQUIRY 7.1.3
13H V
14H O RECOVER BUFFERED DATA 10.5
15H O MODE SELECT 10.6
16H O RESERVE UNIT 10.7.1
17H O RELEASE UNIT 10.7.2
18H O COPY 7.1.4
19H V
1AH O MODE SENSE 10.8
1BH O STOP PRINT 10.9
1CH O RECEIVE DIAGNOSTIC RESULTS 7.1.5
1DH O SEND DIAGNOSTIC 7.1.6
1EH R
1FH R
==============================================================================
Key: M = Command implementation is mandatory.
E = Command implementation is required for SCSI devices that support
device-independent self-configuring software.
O = Command implementation is optional.
R = Operation code is reserved for future standardization.
V = Operation code is available for vendor unique commands.
.pa
10.1 FORMAT Command
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 04H
Table 10-2
FORMAT Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved | Format Type |
-----|-----------------------------------------------------------------------|
2 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
3 | Transfer Length |
-----|-----------------------------------------------------------------------|
4 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The FORMAT command (Table 10-2) provides a means for the initiator to
specify forms or fonts to printers that support programmable forms or fonts.
The format information sent is vendor unique since it is peripheral-device
specific.
The format type field specifies the type of format information to be
transferred from the initiator to the target. This field is defined as
follows:
DB(1) DB(0) Format Type
----- ----- -------------
0 0 Set Form
0 1 Set Font
1 0 Vendor Unique
1 1 Reserved
The transfer length specifies the length in bytes of format information that
shall be sent during the DATA OUT phase. A transfer length of zero indicates
that no format information shall be sent. This condition shall not be
considered as an error.
.pa
10.2 PRINT Command
Peripheral Device Type: Printer
Operation Code Type: Mandatory
Operation Code: 0AH
Table 10-3
PRINT Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
3 | Transfer Length |
-----|-----------------------------------------------------------------------|
4 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The PRINT command (Table 10-3) transfers the specified number of bytes from
the initiator to the target to be printed. The data sent is application
dependent.
The transfer length specifies the length in bytes of data that shall be sent
during the DATA OUT phase. A transfer length of zero indicates that no data
shall be sent. This condition shall not be considered as an error.
.pa
10.3 SLEW AND PRINT Command
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 0BH
Table 10-4
SLEW AND PRINT Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved | Channel|
-----|-----------------------------------------------------------------------|
2 | Slew Value |
-----|-----------------------------------------------------------------------|
3 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
4 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The SLEW AND PRINT command (Table 10-4) transfers the specified number of
bytes from the initiator to the target to be printed. The data sent is
application dependent. This command is provided for printers that do not
support forms control information imbedded within the print data.
The transfer length specifies the length in bytes of data that shall be sent
during the DATA OUT phase. A transfer length of zero indicates that no data
shall be sent. This condition shall not be considered as an error.
If the channel bit is zero, the slew value specifies the number of lines the
form shall be advanced before printing. A value of 255 indicates that the
form shall be advanced to the first line of the next form before printing. If
the channel bit is one, the slew value specifies the forms control channel
number to which the form shall be advanced prior to printing the data.
If the channel bit is one, and the channel option is not implemented, the
command shall be terminated with a CHECK CONDITION status and the sense key
shall be set to ILLEGAL REQUEST.
.pa
10.4 FLUSH BUFFER Command
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 10H
Table 10-5
FLUSH BUFFER Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
-----|-----------------------------------------------------------------------|
4 | Reserved |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The FLUSH BUFFER command (Table 10-5) provides a means for an initiator to
ensure that the data have been successfully printed prior to releasing the
peripheral device. This is useful for applications that wish to handle any
error or exception conditions (e.g., end-of-medium) prior to termination of
the application.
When all buffered data are actually printed the command shall be terminated
with a GOOD status. If it is not possible to finish printing all of the
buffered data (due to an error or exception condition on the peripheral
device), then this command shall be terminated with a CHECK CONDITION status
and the appropriate sense key.
.pa
10.5 RECOVER BUFFERED DATA Command
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 14H
Table 10-6
RECOVER BUFFERED DATA Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
3 | Transfer Length |
-----|-----------------------------------------------------------------------|
4 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The RECOVER BUFFERED DATA command (Table 10-6) returns to the initiator the
data that has been sent to the target, but not yet printed.
This command is normally used only to recover from error or exception
conditions that make it impossible to print the buffered data. The order in
which the data is transferred from the target to the initiator is the same as
it was when the data was previously transferred using the PRINT command or
SLEW AND PRINT command. Data that is transferred by this command is deleted
>From the target data buffer. One or more RECOVER BUFFERED DATA commands may
be used to return the unprinted buffered data.
If an attempt is made to recover more data than is contained in the buffer,
the command shall be terminated with a CHECK CONDITION status and the sense
key shall be set to NO SENSE. In addition, the EOM, the valid, and the ILI
bits in extended sense shall be set to one. The information bytes shall be
set to the difference (residue) between the transfer length and the actual
number of bytes returned.
The transfer length specifies the maximum length in bytes of data that shall
be transferred during the DATA IN phase. A transfer length of zero indicates
that no data shall be transferred. This condition shall not be considered as
an error.
.pa
10.6 MODE SELECT Command
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 15H
Table 10-7
MODE SELECT Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
-----|-----------------------------------------------------------------------|
4 | Parameter List Length |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The MODE SELECT command (Table 10-7) provides a means for the initiator to
specify medium, logical unit, or peripheral device parameters to the target.
The parameter list length specifies the length in bytes of the MODE SELECT
parameter list that shall be transferred during the DATA OUT phase. A
parameter list length of zero indicates that no data shall be transferred.
This condition shall not be considered as an error. The MODE SELECT parameter
list (Table 10-8) contains a four-byte header, followed by the vendor unique
parameters, if any.
Table 10-8
MODE SELECT Parameter List
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Reserved |
-----|-----------------------------------------------------------------------|
1 | Reserved |
-----|-----------------------------------------------------------------------|
2 |Reserved| Buffered Mode | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
==============================================================================
| Vendor Unique Parameter(s) |
==============================================================================
0 _ n| Vendor Unique |
| Parameter Byte(s) |
==============================================================================
A buffered mode of zero indicates that the target shall not report a GOOD
status on PRINT commands or SLEW AND PRINT commands until the data are
actually printed. A buffered mode of one indicates that the target may report
a GOOD status on PRINT commands or SLEW AND PRINT commands as soon as the data
have been transferred to the SCSI device buffer. The data from one or more
commands may be buffered prior to printing. Buffered modes of 2H through 7H
are reserved.
10.7 RESERVE UNIT and RELEASE UNIT Commands
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 16H and 17H, respectively
Table 10-9
RESERVE UNIT and RELEASE UNIT Commands
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | 3rdPty | Third Party Device ID |Reserved|
-----|-----------------------------------------------------------------------|
2 | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
-----|-----------------------------------------------------------------------|
4 | Reserved |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The RESERVE UNIT and RELEASE UNIT commands both use the command descriptor
block shown in Table 10-9.
10.7.1 RESERVE UNIT Command. The RESERVE UNIT command (Table 10-9,
operation code 16H) shall reserve the specified logical unit for the exclusive
use by the requesting initiator or, if third-party reservation option is
implemented, to another specified SCSI device.
The reservation shall remain in effect until superceded by another RESERVE
UNIT command from the initiator that made the reservation or until released by
a RELEASE UNIT command from the same initiator, or a BUS DEVICE RESET message
>From any initiator, or a "hard" RESET condition. The occurrence of the last
two conditions is indicated by a sense key of UNIT ATTENTION on the next
command following the condition. It is not an error to issue this command to
a logical unit that is currently reserved to the requesting initiator.
If the logical unit is previously reserved by another initiator, then the
target shall either:
(1) return a RESERVATION CONFLICT status
(2) queue the reservation request and disconnect until all previously
queued reservations have been released. When the logical unit is available,
the target shall reconnect to perform the reservation
If, after honoring the reservation, any other initiator then subsequently
attempts to perform any command on the reserved logical unit other than a
RESERVE UNIT command, which may be queued, or a RELEASE UNIT command, which
shall be ignored, then the command shall be rejected with a RESERVATION
CONFLICT status.
The third-party reservation option for the RESERVE UNIT command allows an
initiator to reserve a logical unit for another SCSI device. This option is
intended for use in multiple-initiator systems that use the COPY command. Any
target that implements the third-party reservation option shall also implement
the third-party release option (see 10.7.2).
If the third-party (3rdPty) bit is zero, then the third-party reservation
option is not requested. If the 3rdPty bit is one and the third-party
reservation option is implemented, then the RESERVE UNIT command shall reserve
the specified logical unit for the SCSI device specified in the third-party
device ID field. The target shall preserve the reservation until superceded
by another RESERVE UNIT command from the initiator that made the reservation
or until released by the same initiator, by a BUS DEVICE RESET message from
any initiator, or by a "hard" RESET condition. The target shall ignore (i.e.,
return GOOD status) any attempt made by any other initiator to release the
reservation.
If the 3rdPty bit is one and the third-party reservation option is not
implemented, then the target shall reject the RESERVE UNIT command with a
CHECK CONDITION status and a sense key of ILLEGAL REQUEST.
An initiator that holds a current reservation may modify that reservation
(e.g., switch third-parties) by issuing another RESERVE UNIT command to the
same logical unit. The superceding RESERVE UNIT command shall release the
previous reservation state only when the new reservation is granted. A
superceding reservation takes priority over any previously queued reservation
request.
10.7.2 RELEASE UNIT Command. The RELEASE UNIT command (Table 10-9,
operation code 17H) shall release the logical unit if it is currently reserved
by the requesting initiator.
It is not an error to attempt to release a logical unit that is not
currently reserved to the requesting initiator. However, it shall not be
released if it is reserved by another initiator.
The third-party release option for the RELEASE UNIT command allows an
initiator to release a logical unit that was previously reserved using the
third-party reservation option (see 10.7.1). This option shall be implemented
if the third-party reservation option is implemented. This option is intended
for use in multiple-initiator systems that use the COPY command.
If the third-party (3rdPty) bit is zero, then the third-party release option
is not requested. If the 3rdPty bit is one and the target implements the
third-party release option, then the target shall release the specified
logical unit, but only if the reservation was made using the third-party
reservation option by the initiator that is requesting the release and for the
same SCSI device as specified in the third-party device ID field.
If the 3rdPty bit is one and the target does not implement the third-party
release option, then the target shall terminate the command with a CHECK
CONDITION status and the sense key shall be set to ILLEGAL REQUEST.
10.8 MODE SENSE Command
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 1AH
Table 10-10
MODE SENSE Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
-----|-----------------------------------------------------------------------|
4 | Allocation Length |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The MODE SENSE command (Table 10-10) provides a means for a target to report
its medium, logical unit, or peripheral device parameters to the initiator.
It is a complementary command to the MODE SELECT command.
The allocation length specifies the number of bytes that the initiator has
allocated for returned MODE SENSE data. An allocation length of zero
indicates that no MODE SENSE data shall be transferred. This condition shall
not be considered as an error. Any other value indicates the maximum number
of bytes that shall be transferred. The target shall terminate the DATA IN
phase when allocation length bytes have been transferred or when all available
MODE SENSE data have been transferred to the initiator, whichever is less.
The MODE SENSE data (Table 10-11) contains a four-byte header, followed the
vendor unique parameters, if any.
.pa
Table 10-11
MODE SENSE Data
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Sense Data Length |
-----|-----------------------------------------------------------------------|
1 | Reserved |
-----|-----------------------------------------------------------------------|
2 |Reserved| Buffered Mode | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
==============================================================================
| Vendor Unique Parameter(s) |
==============================================================================
0 _ n| Vendor Unique |
| Parameter Byte(s) |
==============================================================================
The sense data length specifies the length in bytes of the following MODE
SENSE data that is available to be transferred during the DATA IN phase. The
sense data length does not include itself.
A buffered mode of zero indicates that the target does not report a GOOD
status on PRINT commands or SLEW AND PRINT commands until the data are
actually printed. A buffered mode of one indicates that the target may report
a GOOD status on PRINT commands or SLEW AND PRINT commands as soon as the data
have been transferred to the SCSI device buffer. The data from one or more
commands may be buffered prior to printing. Buffered modes of 2H through 7H
are reserved.
.pa
10.9 STOP PRINT Command
Peripheral Device Type: Printer
Operation Code Type: Optional
Operation Code: 1BH
Table 10-12
STOP PRINT Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved | Retain |
-----|-----------------------------------------------------------------------|
2 | Vendor Unique |
-----|-----------------------------------------------------------------------|
3 | Reserved |
-----|-----------------------------------------------------------------------|
4 | Reserved |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The STOP PRINT command (Table 10-12) is used to halt printing on buffered
devices in an orderly fashion.
A retain bit of zero requests that the target data buffer be discarded;
otherwise, the unprinted data is retained. The unprinted data may be
recovered by use of the RECOVER BUFFERED DATA command, if supported. A
subsequent PRINT command or SLEW AND PRINT command shall cause the remaining
unprinted and unrecovered data to be printed followed by the data transferred
by the subsequent command. The point at which printing is suspended by this
command is peripheral-device specific and is not defined by this standard.
.pa
.fo Section 11 #
11. Group 0 Command Descriptions for Processor Devices
The Group 0 commands for processor devices shall be as shown in Table 11-1.
Table 11-1
Group 0 Commands for Processor Devices
==============================================================================
Operation
Code Type Command Name Section
------------------------------------------------------------------------------
00H O TEST UNIT READY 7.1.1
01H V
02H V
03H M REQUEST SENSE 7.1.2
04H V
05H V
06H V
07H V
08H O RECEIVE 11.1
09H V
0AH M SEND 11.2
0BH V
0CH V
0DH V
0EH V
0FH V
10H V
11H V
12H E INQUIRY 7.1.3
13H V
14H V
15H V
16H V
17H V
18H O COPY 7.1.4
19H R
1AH R
1BH R
1CH O RECEIVE DIAGNOSTIC RESULTS 7.1.5
1DH O SEND DIAGNOSTIC 7.1.6
1EH R
1FH R
==============================================================================
Key: M = Command implementation is mandatory.
E = Command implementation is required for SCSI devices that support
device-independent self-configuring software.
O = Command implementation is optional.
R = Operation code is reserved for future standardization.
V = Operation code is available for vendor unique commands.
.pa
11.1 RECEIVE Command
Peripheral Device Type: Processor Devices
Operation Code Type: Optional
Operation Code: 08H
Table 11-2
RECEIVE Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Allocation Length (MSB) |
-----|-----------------------------------------------------------------------|
3 | Allocation Length |
-----|-----------------------------------------------------------------------|
4 | Allocation Length (LSB) |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The RECEIVE command (Table 11-2) transfers data from the target to the
initiator.
The allocation length specifies the number of bytes that the initiator has
allocated for the returned data. An allocation length of zero indicates that
no data shall be transferred. This condition shall not be considered as an
error. Any other value indicates the maximum number of bytes that shall be
transferred. The target shall terminate the DATA IN phase when allocation
length bytes have been transferred or when all available data have been
transferred to the initiator, whichever is less.
.pa
11.2 SEND Command
Peripheral Device Type: Processor Devices
Operation Code Type: Mandatory
Operation Code: 0AH
Table 11-3
SEND Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
3 | Transfer Length |
-----|-----------------------------------------------------------------------|
4 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The SEND command (Table 11-3) transfers data from the initiator to the
target.
The transfer length specifies the length in bytes of data that shall be sent
during the DATA OUT phase. A transfer length of zero indicates that no data
shall be sent. This condition shall not be considered as an error.
.pa
.fo Section 12 #
12. Command Descriptions for Write-Once Read-Multiple Devices
12.1 Group 0 Commands for Write-Once Read-Multiple Devices. The Group 0
commands for write-once read-multiple devices shall be as shown in Table 12-1.
Table 12-1
Group 0 Commands for Write-Once Read-Multiple Devices
==============================================================================
Operation
Code Type Command Name Section
------------------------------------------------------------------------------
00H O TEST UNIT READY 7.1.1
01H O REZERO UNIT 8.1.1
02H V
03H M REQUEST SENSE 7.1.2
04H R
05H V
06H V
07H O REASSIGN BLOCKS 8.1.3
08H O READ 12.1.1
09H V
0AH O WRITE 12.1.2
0BH O SEEK 8.1.6
0CH V
0DH V
0EH V
0FH V
10H V
11H V
12H E INQUIRY 7.1.3
13H V
14H V
15H O MODE SELECT 12.1.3
16H O RESERVE 8.1.8
17H O RELEASE 8.1.9
18H O COPY 7.1.4
19H V
1AH O MODE SENSE 12.1.4
1BH O START/STOP UNIT 8.1.11
1CH O RECEIVE DIAGNOSTIC RESULTS 7.1.5
1DH O SEND DIAGNOSTIC 7.1.6
1EH O PREVENT/ALLOW MEDIUM REMOVAL 8.1.12
1FH R
==============================================================================
Key: M = Command implementation is mandatory.
E = Command implementation is required for SCSI devices that support
device-independent self-configuring software.
O = Command implementation is optional.
R = Operation code is reserved for future standardization.
V = Operation code is available for vendor unique commands.
.pa
12.1.1 READ Command
Peripheral Device Type: Write-Once Read-Multiple and
Read-Only Direct Access
Operation Code Type: Optional
Operation Code: 08H
Table 12-2
READ Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number |Logical Block Address (MSB) |
-----|-----------------------------------------------------------------------|
2 | Logical Block Address |
-----|-----------------------------------------------------------------------|
3 | Logical Block Address (LSB) |
-----|-----------------------------------------------------------------------|
4 | Transfer Length |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The READ command (Table 12-2) requests that the target transfer data to the
initiator.
The logical block address specifies the logical block at which the read
operation shall begin.
The transfer length specifies the number of contiguous logical blocks of
data to be transferred. A Transfer Length of zero indicates that 256 logical
blocks shall be transferred. Any other value indicates the number of logical
blocks that shall be transferred.
This command shall be terminated with a status of RESERVATION CONFLICT if
any reservation access conflict (see 8.1.8) exists and no data shall be
transferred.
If any of the following conditions occur, this command shall be terminated
with a CHECK CONDITION status, and if extended sense is implemented, the sense
key shall be set as indicated in the following table. This table does not
provide an exhaustive enumeration of all conditions that may cause the CHECK
CONDITION status.
.pa
Condition Sense Key
---------------------------------------------- ----------------------------
Invalid logical block address ILLEGAL REQUEST (see note 1)
Target reset or medium change since the
last command from this initiator UNIT ATTENTION
Unrecoverable read error MEDIUM ERROR
Overrun or other error that might
be resolved by repeating the command ABORTED COMMAND
Attempt to read a blank or previously
unwritten block BLANK CHECK (see note 2)
NOTES:
(1) The extended sense information bytes shall be set to the logical block
address of the first invalid address.
(2) The extended sense information bytes shall be set to the logical block
address of the first blank block encountered. The data read up to that block
shall be transferred.
12.1.2 WRITE Command
Peripheral Device Type: Write-Once Read-Multiple
Operation Code Type: Optional
Operation Code: 0AH
Table 12-3
WRITE Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number |Logical Block Address (MSB) |
-----|-----------------------------------------------------------------------|
2 | Logical Block Address |
-----|-----------------------------------------------------------------------|
3 | Logical Block Address (LSB) |
-----|-----------------------------------------------------------------------|
4 | Transfer Length |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The WRITE command (Table 12-3) requests that the target write the data
transferred from the initiator to the medium.
The logical block address specifies the logical block at which the write
operation shall begin.
The transfer length specifies the number of contiguous logical blocks of
data that shall be written. A transfer length of zero indicates that 256
logical blocks shall be written. Any other value indicates the number of
logical blocks that shall be written.
This command shall be terminated with a status of RESERVATION CONFLICT if
any reservation access conflict (see 8.1.8) exists and no data shall be
written.
If any of the following conditions occur, this command shall be terminated
with a CHECK CONDITION status, and if extended sense is implemented, the sense
key shall be set as indicated in the following table. This table does not
provide an exhaustive enumeration of all conditions that may cause the CHECK
CONDITION status.
Condition Sense Key
---------------------------------------------- ----------------------------
Invalid logical block address ILLEGAL REQUEST (see note 1)
Target reset or medium change since the
last command from this initiator UNIT ATTENTION
Overrun or other error that might
be resolved by repeating the command ABORTED COMMAND
Attempt to write a previously
written block and blank checking is
enabled (see 12.1.3) BLANK CHECK (see note 2)
NOTES:
(1) The extended sense information bytes shall be set to the logical Block
Address of the first invalid address.
(2) The extended sense information bytes shall be set to the logical block
address of the first non-blank block encountered.
.pa
12.1.3 MODE SELECT Command
Peripheral Device Type: Write-Once Read-Multiple and
Read-Only Direct Access
Operation Code Type: Optional
Operation Code: 15H
Table 12-4
MODE SELECT Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
-----|-----------------------------------------------------------------------|
4 | Parameter List Length |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The MODE SELECT command (Table 12-4) provides a means for the initiator to
specify medium, logical unit, or peripheral device parameters to the target.
The parameter list length specifies the length in bytes of the MODE SELECT
parameter list that shall be transferred from the initiator to the target. A
parameter list length of zero indicates that no data shall be transferred.
This condition shall not be considered as an error.
The MODE SELECT parameter list (Table 12-5) contains a four-byte header,
followed by zero or more eight-byte block descriptors, followed by the vendor
unique parameters, if any.
.pa
Table 12-5
MODE SELECT Parameter List
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Reserved |
-----|-----------------------------------------------------------------------|
1 | Reserved |
-----|-----------------------------------------------------------------------|
2 | Reserved | EBC |
-----|-----------------------------------------------------------------------|
3 | Block Descriptor Length |
==============================================================================
| Block Descriptor(s) |
==============================================================================
0 | Reserved |
-----|-----------------------------------------------------------------------|
1 | Number of Blocks (MSB) |
-----|-----------------------------------------------------------------------|
2 | Number of Blocks |
-----|-----------------------------------------------------------------------|
3 | Number of Blocks (LSB) |
-----|-----------------------------------------------------------------------|
4 | Reserved |
-----|-----------------------------------------------------------------------|
5 | Block Length (MSB) |
-----|-----------------------------------------------------------------------|
6 | Block Length |
-----|-----------------------------------------------------------------------|
7 | Block Length (LSB) |
==============================================================================
| Vendor Unique Parameter(s) |
==============================================================================
0 _ n| Vendor Unique |
| Parameter Byte(s) |
==============================================================================
An enable blank check (EBC) bit of zero disables blank checking of the
medium during write operations. An EBC bit of one enables blank checking.
If a non-blank block is found during a write operation, the command shall be
terminated with a CHECK CONDITION status and the sense key shall be set to
BLANK CHECK. For read-only direct-access devices, the EBC bit is reserved.
The block descriptor length specifies the length in bytes of all the block
descriptors. It is equal to the number of block descriptors times eight and
does not include the vendor unique parameters, if any. A block descriptor
length of zero indicates that no block descriptors shall be included in the
parameter list. This condition shall not be considered as an error.
Each block descriptor specifies the medium characteristics for all or part
of a logical unit. Each block descriptor contains a number of blocks and a
block length. The number of blocks field specifies the number of logical
blocks to be formatted with the block length specified in the block
descriptor. The block length field specifies the length in bytes of the
logical block to be formatted.
12.1.4 MODE SENSE Command
Peripheral Device Type: Write-Once Read-Multiple and
Read-Only Direct Access
Operation Code Type: Optional
Operation Code: 1AH
Table 12-6
MODE SENSE Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved |
-----|-----------------------------------------------------------------------|
2 | Reserved |
-----|-----------------------------------------------------------------------|
3 | Reserved |
-----|-----------------------------------------------------------------------|
4 | Allocation Length |
-----|-----------------------------------------------------------------------|
5 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The MODE SENSE command (Table 12-6) provides a means for a target to report
its medium, logical unit, or peripheral device parameters to the initiator.
It is a complementary command to the MODE SELECT command for support of medium
that may contain multiple block lengths.
The allocation length specifies the number of bytes that the initiator has
allocated for returned MODE SENSE Data. An allocation length of zero
indicates that no MODE SENSE data shall be transferred. This condition shall
not be considered as an error. Any other value indicates the maximum number
of bytes that shall be transferred. The target shall terminate the DATA IN
phase when allocation length bytes have been transferred or when all available
MODE SENSE data have been transferred to the initiator, whichever is less.
The MODE SENSE data (Table 12-7) contains a four-byte header, followed by
zero or more eight-byte block descriptors, followed by the vendor unique
parameters, if any.
.pa
Table 12-7
MODE SENSE Data
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Sense Data Length |
-----|-----------------------------------------------------------------------|
1 | Medium Type |
-----|-----------------------------------------------------------------------|
2 | WP | Reserved | EBC |
-----|-----------------------------------------------------------------------|
3 | Block Descriptor Length |
==============================================================================
| Block Descriptor(s) |
==============================================================================
0 | Reserved |
-----|-----------------------------------------------------------------------|
1 | Number of Blocks (MSB) |
-----|-----------------------------------------------------------------------|
2 | Number of Blocks |
-----|-----------------------------------------------------------------------|
3 | Number of Blocks (LSB) |
-----|-----------------------------------------------------------------------|
4 | Reserved |
-----|-----------------------------------------------------------------------|
5 | Block Length (MSB) |
-----|-----------------------------------------------------------------------|
6 | Block Length |
-----|-----------------------------------------------------------------------|
7 | Block Length (LSB) |
==============================================================================
| Vendor Unique Parameter(s) |
==============================================================================
0 _ n| Vendor Unique |
| Parameter Byte(s) |
==============================================================================
The sense data length specifies the length in bytes of the following MODE
SENSE data that is available to be transferred during the DATA IN phase. The
sense data length does not include itself.
Code values for the medium type field shall be assigned as follows:
00H Default (only one medium type supported)
01H _ 7FH Reserved
80H _ FFH Vendor unique
An enable blank check (EBC) bit of zero indicates that blank checking of the
medium during write operations is disabled. An EBC bit of one indicates that
blank checking during write operations is enabled. For read-only direct-
access devices, the EBC bit is reserved.
A write protected (WP) bit of zero indicates that the medium is write
enabled. A WP bit of one indicates that the medium is write protected. For
read-only direct-access devices, the WP bit is reserved.
The block descriptor length specifies the length in bytes of all the block
descriptors. It is equal to the number of block descriptors times eight and
does not include the vendor unique parameters, if any. A block descriptor
length of zero indicates that no block descriptors shall be included in the
parameter list. This condition shall not be considered as an error.
Each block descriptor specifies the medium characteristics for all or part
of a logical unit. Each block descriptor contains a number of blocks and a
block length.
The number of blocks field indicates the number of logical blocks that have
the block length specified in the block descriptor. The block length field
indicates the length in bytes of each logical block.
.pa ??
12.2 Group 1 Commands for Write-Once Read-Multiple Devices. The Group 1
commands for write-once read-multiple devices shall be as shown in Table 12-8.
Table 12-8
Group 1 Commands for Write-Once Read-Multiple Devices
==============================================================================
Operation
Code Type Command Name Section
------------------------------------------------------------------------------
20H V
21H V
22H V
23H V
24H V
25H E READ CAPACITY 8.2.1
26H V
27H V
28H M READ 12.2.1
29H V
2AH M WRITE 12.2.2
2BH O SEEK 8.2.4
2CH V
2DH V
2EH O WRITE AND VERIFY 12.2.3
2FH O VERIFY 12.2.4
30H O SEARCH DATA HIGH 8.2.7.1
31H O SEARCH DATA EQUAL 8.2.7.2
32H O SEARCH DATA LOW 8.2.7.3
33H O SET LIMITS 8.2.8
34H R
35H R
36H R
37H R
38H R
39H O COMPARE 7.2.1
3AH O COPY AND VERIFY 7.2.2
3BH R
3CH R
3DH R
3EH R
3FH R
==============================================================================
Key: M = Command implementation is mandatory.
E = Command implementation is required for SCSI devices that support
device-independent self-configuring software.
O = Command implementation is optional.
R = Operation code is reserved for future standardization.
V = Operation code is available for vendor unique commands.
.pa
12.2.1 READ Command
Peripheral Device Type: Write-Once Read-Multiple and
Read-Only Direct Access
Operation Code Type: Mandatory
Operation Code: 28H
Table 12-9
READ Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved | RelAdr |
-----|-----------------------------------------------------------------------|
2 | Logical Block Address (MSB) |
-----|-----------------------------------------------------------------------|
3 | Logical Block Address |
-----|-----------------------------------------------------------------------|
4 | Logical Block Address |
-----|-----------------------------------------------------------------------|
5 | Logical Block Address (LSB) |
-----|-----------------------------------------------------------------------|
6 | Reserved |
-----|-----------------------------------------------------------------------|
7 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
8 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
9 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The READ command (Table 12-9) requests that the target transfer data to the
initiator from the medium.
The logical block address specifies the logical block at which the read
operation shall begin.
The transfer length specifies the number of contiguous logical blocks of
data that shall be transferred. A transfer length of zero indicates that no
data shall be transferred. This condition shall not be considered as an
error. Any other value indicates the number of logical blocks that shall be
transferred.
This command shall be terminated with a status of RESERVATION CONFLICT if
any reservation access conflict (see 8.1.8) exists and no data shall be
transferred.
If any of the following conditions occur, this command shall be terminated
with a CHECK CONDITION status and, if extended sense is implemented, the sense
key shall be set as indicated in the following table. This table does not
provide an exhaustive enumeration of all conditions that may cause the CHECK
CONDITION status.
Condition Sense Key
---------------------------------------------- ----------------------------
Invalid logical block address ILLEGAL REQUEST (see note 1)
Target reset or medium change since the
last command from this initiator UNIT ATTENTION
Overrun or other error that might
be resolved by repeating the command ABORTED COMMAND
Attempt to read a blank or previously
unwritten block BLANK CHECK (see note 2)
NOTES:
(1) The extended sense information bytes shall be set to the logical block
address of the first invalid address.
(2) The extended sense information bytes shall be set to the logical block
address of the first blank block encountered. The data read up to that block
shall be transferred.
12.2.2 WRITE Command
Peripheral Device Type: Write-Once Read-Multiple
Operation Code Type: Mandatory
Operation Code: 2AH
Table 12-10
WRITE Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved | RelAdr |
-----|-----------------------------------------------------------------------|
2 | Logical Block Address (MSB) |
-----|-----------------------------------------------------------------------|
3 | Logical Block Address |
-----|-----------------------------------------------------------------------|
4 | Logical Block Address |
-----|-----------------------------------------------------------------------|
5 | Logical Block Address (LSB) |
-----|-----------------------------------------------------------------------|
6 | Reserved |
-----|-----------------------------------------------------------------------|
7 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
8 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
9 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The WRITE command (Table 12-10) requests that the target write the data
transferred from the initiator to the medium.
The logical block address specifies the logical block at which the write
operation shall begin.
The transfer length specifies the number of contiguous logical blocks of
data that shall be transferred. A transfer length of zero indicates that no
data shall be transferred. This condition shall not be considered as an
error and no data shall be written. Any other value indicates the number of
logical blocks that shall be transferred.
This command shall be terminated with a status of RESERVATION CONFLICT if
any reservation access conflict (see 8.1.8) exists and no data shall be
written.
If any of the following conditions occur, this command shall be terminated
with a CHECK CONDITION status and, if extended sense is implemented, the sense
key shall be set as indicated in the following table. This table does not
provide an exhaustive enumeration of all conditions that may cause the CHECK
CONDITION status.
Condition Sense Key
---------------------------------------------- ----------------------------
Invalid logical block address ILLEGAL REQUEST (see note 1)
Target reset or medium change since the
last command from this initiator UNIT ATTENTION
Overrun or other error that might
be resolved by repeating the command ABORTED COMMAND
Attempt to write a previously
written block and blank checking is
enabled (see 12.1.3) BLANK CHECK (see note 2)
NOTES:
(1) The extended sense information bytes shall be set to the logical block
address of the first invalid address.
(2) The extended sense information bytes shall be set to the logical block
address of the first non-blank block encountered.
.pa
12.2.3 WRITE AND VERIFY Command
Peripheral Device Type: Write-Once Read-Multiple
Operation Code Type: Optional
Operation Code: 2EH
Table 12-11
WRITE AND VERIFY Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved | BytChk | RelAdr |
-----|-----------------------------------------------------------------------|
2 | Logical Block Address (MSB) |
-----|-----------------------------------------------------------------------|
3 | Logical Block Address |
-----|-----------------------------------------------------------------------|
4 | Logical Block Address |
-----|-----------------------------------------------------------------------|
5 | Logical Block Address (LSB) |
-----|-----------------------------------------------------------------------|
6 | Reserved |
-----|-----------------------------------------------------------------------|
7 | Transfer Length (MSB) |
-----|-----------------------------------------------------------------------|
8 | Transfer Length (LSB) |
-----|-----------------------------------------------------------------------|
9 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The WRITE AND VERIFY command (Table 12-11) requests that the target write
the data transferred from the initiator to the medium and then verify that the
data is correctly written.
A byte check (BytChk) bit of zero causes the verification to be simply a
medium verification (CRC, ECC, etc). A BytChk bit of one causes a byte-by-
byte compare of data written to the peripheral device and the data transferred
>From the initiator. If the compare is unsuccessful, the command shall be
terminated with a CHECK CONDITION status and the sense key shall be set to
MISCOMPARE.
The logical block address specifies the logical block at which the write
operation shall begin.
The transfer length specifies the number of contiguous logical blocks of
data that shall be transferred. A transfer length of zero indicates that no
logical blocks shall be transferred. This condition shall not be considered
as an error and no data shall be written. Any other value indicates the
number of logical blocks that shall be transferred.
.pa
12.2.4 VERIFY Command
Peripheral Device Type: Write-Once Read-Multiple and
Read-Only Direct Access
Operation Code Type: Optional
Operation Code: 2FH
Table 12-12
VERIFY Command
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 | Operation Code |
-----|-----------------------------------------------------------------------|
1 | Logical Unit Number | Reserved | BlkVfy | BytChk | RelAdr |
-----|-----------------------------------------------------------------------|
2 | Logical Block Address (MSB) |
-----|-----------------------------------------------------------------------|
3 | Logical Block Address |
-----|-----------------------------------------------------------------------|
4 | Logical Block Address |
-----|-----------------------------------------------------------------------|
5 | Logical Block Address (LSB) |
-----|-----------------------------------------------------------------------|
6 | Reserved |
-----|-----------------------------------------------------------------------|
7 | Verification Length (MSB) |
-----|-----------------------------------------------------------------------|
8 | Verification Length (LSB) |
-----|-----------------------------------------------------------------------|
9 | Vendor Unique | Reserved | Flag | Link |
==============================================================================
The VERIFY command (Table 12-12) requests that the target verify the data on
the medium.
A byte check (BytChk) bit of zero causes the verification to be simply a
medium verification (CRC, ECC, etc). A BytChk bit of one causes a byte-by-
byte compare of the data on the medium and the data transferred from the
initiator. The data shall be transferred as it would be for a WRITE command.
If the compare is unsuccessful, the command shall be terminated with a CHECK
CONDITION status and the sense key shall be set to MISCOMPARE.
A blank verify (BlkVfy) bit of one causes a verification that the blocks are
blank.
The logical block address specifies the logical block at which the verify
operation shall begin.
The verification length specifies the number of contiguous logical blocks of
data or blanks that shall be verified. A verification length of zero
indicates that no logical blocks shall be verified. This condition shall not
be considered as an error. Any other value indicates the number of logical
blocks that shall be verified.
.fo Section 13 #
13. Command Descriptions for Read-Only Direct-Access Devices
13.1 Group 0 Commands for Read-Only Direct-Access Devices. The Group 0
commands for read-only direct-access devices shall be as shown in Table 13-1.
Table 13-1
Group 0 Commands for Read-Only Direct-Access Devices
==============================================================================
Operation
Code Type Command Name Section
------------------------------------------------------------------------------
00H O TEST UNIT READY 7.1.1
01H O REZERO UNIT 8.1.1
02H V
03H M REQUEST SENSE 7.1.2
04H R
05H V
06H V
07H R
08H O READ 12.1.1
09H V
0AH R
0BH O SEEK 8.1.6
0CH V
0DH V
0EH V
0FH V
10H V
11H V
12H E INQUIRY 7.1.3
13H V
14H V
15H O MODE SELECT 12.1.3
16H O RESERVE 8.1.8
17H O RELEASE 8.1.9
18H O COPY 7.1.4
19H V
1AH O MODE SENSE 12.1.4
1BH O START/STOP UNIT 8.1.11
1CH O RECEIVE DIAGNOSTIC RESULTS 7.1.5
1DH O SEND DIAGNOSTIC 7.1.6
1EH O PREVENT/ALLOW MEDIUM REMOVAL 8.1.12
1FH R
==============================================================================
Key: M = Command implementation is mandatory.
E = Command implementation is required for SCSI devices that support
device-independent self-configuring software.
O = Command implementation is optional.
R = Operation code is reserved for future standardization.
V = Operation code is available for vendor unique commands.
.pa
13.2 Group 1 Commands for Read-Only Direct-Access Devices. The Group 1
commands for read-only direct-access devices shall be as shown in Table 13-2.
Table 13-2
Group 1 Commands for Read-Only Direct-Access Devices
==============================================================================
Operation
Code Type Command Name Section
------------------------------------------------------------------------------
20H V
21H V
22H V
23H V
24H V
25H E READ CAPACITY 8.2.1
26H V
27H V
28H M READ 12.2.1
29H V
2AH R
2BH O SEEK 8.2.4
2CH V
2DH V
2EH R
2FH O VERIFY 12.2.4
30H O SEARCH DATA HIGH 8.2.7.1
31H O SEARCH DATA EQUAL 8.2.7.2
32H O SEARCH DATA LOW 8.2.7.3
33H O SET LIMITS 8.2.8
34H R
35H R
36H R
37H R
38H R
39H O COMPARE 7.2.1
3AH O COPY AND COMPARE 7.2.2
3BH R
3CH R
3DH R
3EH R
3FH R
==============================================================================
Key: M = Command implementation is mandatory.
E = Command implementation is required for SCSI devices that support
device-independent self-configuring software.
O = Command implementation is optional.
R = Operation code is reserved for future standardization.
V = Operation code is available for vendor unique commands.
.pa
.fo Section 14 #
14. Status
A status byte shall be sent from the target to the initiator during the STATUS
phase at the termination of each command as specified in Tables 14-1 and 14-2
unless the command is cleared by an ABORT message, by a BUS DEVICE RESET
message, or by a "hard" RESET condition.
Table 14-1
Status Byte
==============================================================================
Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Byte | | | | | | | | |
==============================================================================
0 |Reserved| Vendor Unique | Status Byte Code | V |
==============================================================================
Table 14-2
Status Byte Code Bit Values
==============================================================================
Bits of Status Byte
-----------------------------
7 6 5 4 3 2 1 0 Status(es) Represented
------------------------------------------------------------------------------
R V V 0 0 0 0 V GOOD
R V V 0 0 0 1 V CHECK CONDITION
R V V 0 0 1 0 V CONDITION MET/GOOD
R V V 0 0 1 1 V Reserved
R V V 0 1 0 0 V BUSY
R V V 0 1 0 1 V Reserved
R V V 0 1 1 0 V Reserved
R V V 0 1 1 1 V Reserved
R V V 1 0 0 0 V INTERMEDIATE/GOOD
R V V 1 0 0 1 V Reserved
R V V 1 0 1 0 V INTERMEDIATE/CONDITION MET/GOOD
R V V 1 0 1 1 V Reserved
R V V 1 1 0 0 V RESERVATION CONFLICT
R V V 1 1 0 1 V Reserved
R V V 1 1 1 0 V Reserved
R V V 1 1 1 1 V Reserved
==============================================================================
Key: R - Reserved bit
V - Vendor unique bit
.pa
A description of the status byte codes is given below:
GOOD. This status indicates that the target has successfully completed the
command.
CHECK CONDITION. Any error, exception, or abnormal condition that causes
sense data to be set, shall cause a CHECK CONDITION status. The REQUEST SENSE
command should be issued following a CHECK CONDITION status, to determine the
nature of the condition.
CONDITION MET. The SEARCH DATA commands shall return this status whenever a
search condition is satisfied. This status does not break a chain of linked
commands. The logical block address of the logical block that satisfies the
search may be determined with a REQUEST SENSE command.
BUSY. The target is busy. This status shall be returned whenever a target is
unable to accept a command from an initiator. The normal initiator recovery
action is to issue the command again at a later time.
INTERMEDIATE. This status shall be returned for every command in a series of
linked commands (except the last command), unless an error, exception, or
abnormal condition causes a CHECK CONDITION status or a RESERVATION CONFLICT
status to be set. If this status is not returned, the chain of linked
commands is broken; no further commands in the series are executed.
RESERVATION CONFLICT. This status shall be returned whenever an SCSI device
attempts to access a logical unit or an extent within a logical unit that is
reserved for that type of access to another SCSI device.
.pa
