9.4.1 Unexpected BUS FREE Phase Error Condition
There are several error conditions that will cause the file to immediately change to the BUS F R E E phase,
regardless of the state of the A T N signal. The file will not attempt to reconnect to the initiator to complete
the operation that was in progress when the error condition was detected.
The initiator should interpret this
as a catastrophic error condition.
If the L U N was identified by the file prior to the error condition, then the file will abort the active command
for this initiator/LUN and generate sense data for this initiator/LUN to describe the cause of the catastrophic
error. The initiator may retrieve this sense data by issuing a REQUEST SENSE command to this LUN.
Note however, that the REQUEST SENSE command may fail if the catastrophic error condition persists.
If the L U N was not identified by the file prior to the error condition, then the file will not affect the sense
data or the operation of any currently executing command for this initiator or any other initiator.
9.4.2 MESSAGE OUT Phase Parity Error
If the file detects a parity error during the MESSAGE O U T phase, the file will retry the MESSAGE O U T
phase one time as follows:
1. Continue the R E Q / A C K handshakes until the initiator drops ATN.
The file will ignore all the
remaining MESSAGE O U T phase bytes received after the parity error.
2. Assert the R E Q signal prior to changing to any other phase. After detecting this condition, the initiator
must resend all of the previous message byte(s) sent during this MESSAGE O U T phase.
3. Repeat the transfer of the MESSAGE O U T phase bytes(s). If the file receives all of the message byte(s)
successfully, the file will change to:
Any other information transfer phase and transfer at least one byte.
BUS F R E E phase if the message received was A B OR T or BUS DEVICE RESET.
If a second parity error is detected, the target will abort the current command with C H E C K CONDI-
T I O N status and sense data of A B O R T E D C O M M A N D / SCSI PARITY E R R O R .
9.4.3 MESSAGE IN Phase Parity Error (Message Parity Error)
If the file receives a MESSAGE PARITY E R R O R message, it is considered a retrievable error. The file will
do the following one time if no previous retrievable error and if a MESSAGE IN phase has just occurred:
1. Change phase to MESSAGE IN.
2. Send the last message again.
If this is the second retrievable error, the file will terminate the current command as follows:
1. Change to the BUS F R E E phase, regardless of the state of the A T N signal.
2. Abort the active command for this initiator/LUN and set the sense data to A B O R T E D C O M M A N D /
SCSI PARITY E R R O R .
9.4.4 COMMAND Phase Parity Error
1. Change phase to MESSAGE IN and send a R E S T O R E P O I N T E R S message.
2. If R E S T O R E P O I N T E R S message is accepted, then change phase to C O M M A N D O U T and receive
the command again.
If a second parity error is detected, the file will abort the current command with C H E C K C O N D I T I O N
status and sense data of A B O R T E D C O M M A N D / SCSI PARITY E R R O R .
SCSI MESSAGE SYSTEM
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Содержание DCAS-32160 - Ultrastar 2.1 GB Hard Drive
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Страница 59: ...6 7 3 Interface Connector 6 7 3 1 50 pin Model Figure 39 Interface Connector 50 pin Model Specification 45...
Страница 60: ...6 7 3 2 68 pin Model Figure 40 Interface Connector 68 pin Model 46 OEM Spec of DCAS 34330 32160...
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