IBM DCAS-32160 - Ultrastar 2.1 GB Hard Drive, Технические характеристики

Страница: 177 / 232

8.0 SCSI Status Byte
Upon the completion of a command, a status byte is sent to the initiator. Additional sense information may
also be available depending on the contents of the status byte. The following section describes the possible
values for the status byte and sense data.
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³
BIT
³
³
7 6 5 4 3 2 1 0
³
ÚÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄ´
³
STATUS
³
Reserved = 0
³
Status Code
³
RSVD
³
ÀÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÙ
Figure 121. SCSI Status Byte. Format of the SCSI STATUS byte. All Reserved fields(R) are set to zero.
STATUS BYTE Description
00h G O O D
The command has been successfully completed.
02h C H E C K C O N D I T I O N
An error, exception, or abnormal condition has been detected. The sense data is set by the
file. The REQUEST SENSE command should be issued to determine the nature of the
condition.
08h BUSY
This condition is returned when disconnect privilege is not granted while the file is BUSY
processing the other command for the other initiator. The normal initiator recovery action
is to issue the command at a later time, or reissue the command and grant the disconnect
privilege.
10h I N T E R M E D I A T E / G O O D
This status is returned for every command in a series of linked commands (except the last
command), unless an error, exception, or abnormal condition causes a C H E C K CONDI-
T I O N status or a RESERVATION C O N F L I C T status to be set.
If this status is not
returned, the chain of linked commands is broken, and no further commands in the series
are executed.
18h RESERVATION C O N F L I C T
This status is returned whenever an SCSI device attempts to access the file, but it has been
reserved by another initiator. (See 7.25, “RESERVE (16)” on page 141.)
28h Q U E U E F U L L
This status indicates that the target's command queue is full. If tagged command queuing
feature is enabled and there is no room on the command queue, this status is returned
when the initiator sends a command. For this status, sense is not valid.

Copyright IBM Corp. 1996
163