Seagate Ultra160 Product Manual page 239

SCSI Interface Product Manual, Rev. B
additional sense code to Write Protected. When SWP is one and the device model defines a write protect
(WP) bit in the DEVICE-SPECIFIC PARAMETER field in the mode parameter header (see Table 143), the
WP bit shall be set to one for subsequent MODE SENSE commands. A SWP bit of zero specifies that the
logical unit may allow writing to the medium, depending on other write inhibit mechanisms implemented by
the logical unit. When the SWP bit is zero, the value of the WP bit (if defined) is device model specific. The
individual drive's Product Manual, Volume 1, must be consulted to see how each device handles write pro-
tect issues. A jumper on the drive option select head usually provides the device model-specific way to
control write protect.
[11] The RAERP, UAAERP, and EAERP bits enable specific events to be reported via the asynchronous event
reporting protocol. When all three bits are zero, the target shall not use asynchronous event reporting.
AER is defined in SAM-2.
A Ready AER Permission (RAERP) bit of one specifies that the device server may issue an asynchronous
event report upon completing its initialization sequence instead of generating a unit attention condition. A
RAERP bit of zero specifies that the device server shall not issue an asynchronous event report upon
completing its initialization sequence.
Note. If the device server's default value for the RAERP bit is one and it does not implement saved
parameters or include a hardware switch, then it may be impossible to disable the initialization
sequence asynchronous event reporting.
[12] A REUNIT ATTENTION AER Permission (UAAERP) bit of one specifies that the device server may issue
an asynchronous event report instead of creating a unit attention condition upon detecting an unit atten-
tion condition event (other than upon completing an initialization sequence). A UAAERP bit of zero speci-
fies that the device server shall not issue an asynchronous event reporting instead of creating a unit
attention condition.
[13] An Error AER Permission (EAERP) bit of one specifies that the device server may issue an asynchronous
event report upon detecting a deferred error condition instead of waiting to report the deferred error on the
next command. An EAERP bit of zero specifies that the device server shall not report deferred error con-
ditions via an asynchronous event reporting.
[14] The Autoload Mode field specifies the action to be taken by a removable medium device server when a
medium is inserted. For devices other than removable medium devices, this field is reserved. Table 155
shows the usage of the Autoload Mode field.
Table 155: Autoload Mode field
Value Description
000b Medium shall be loaded for full access.
001b Medium shall be loaded for medium auxiliary memory access only.
010b Medium shall not be loaded.
011b - 111b Reserved
[15] The READY AER HOLDOFF PERIOD field specifies the minimum time in milliseconds after the target
starts its initialization sequence that it shall delay before attempting to issue an asynchronous event
report. This value may be rounded up as defined in Section 7.8.
[16] The BUSY TIMEOUT PERIOD field specifies the maximum time, in 100 milliseconds increments, that the
initiator allows for the target to remain busy for unanticipated conditions which are not a routine part of
commands from the initiator. This value may be rounded down as defined in Section 7.8. A 0000h value in
this field is undefined by this manual. An FFFFh value in this field is defined as an unlimited period.
[17] The EXTENDED SELF-TEST COMPLETION TIME field contains advisory data that an application client
may use to determine the time in seconds that the device server requires to complete an extended self-
test when the device server is not interrupted by subsequent commands and no errors occur during exe-
cution of the self-test. The application client should expect this time to increase significantly if other com-
mands are sent to the logical unit while a self-test is in progress or if errors occur during execution of the
self-test. Device servers supporting SELF-TEST CODE field values other than 000b for the SEND DIAG-
NOSTIC command (see Section 8.47), shall support the EXTENDED SELF-TEST COMPLETION TIME
field.
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