Quantum LTO 2 User Manual page 35
Quantum lto 2: user guide
Hide thumbs
Also See for LTO 2:
- User manual (94 pages) ,
- Specifications (1 page) ,
- Quick start manual (4 pages)
Table of Contents
Advertisement
State or Phase
Data Out Phase
Status Phase
Message In Phase
Message Out Phase
LTO-2 SCSI Interface Guide
Description
If the drive detects a parity error while the host is transferring data, the
drive:
• Terminates the transfer of data.
• Switches the host to the Status Phase and sends a Check Condition.
• Switches the host to the Message In Phase and sends Command Complete.
• Sets the Sense Key = B and ASC/ASCQ = 47-00 (SCSI-2 only).
If the host is in the Status phase and detects an error in the status byte and
asserts ATN, the drive:
• Switches the host to the Message Out Phase and waits for the host to send
05 (Initiator Detected Error).
• Switches the host to the Status Phase and sends a Check Condition.
• Target sends restore pointers and resends Status.
If the host is in the Message In Phase and detects an error on a message bytes
an asserts ATN, the drive:
• Switches the host to the Message Out Phase.
• Waits for the host to send 09 (Parity Error Message).
• Switches the host to the Message In Phase and resends the message.
If the host is in the Message Out Phase and sends a message bytes and the
drive detects a parity error, the drive retries forever.
An Initiator that accommodates disconnect/reconnect can indicate this
capability to the tape drive during the Selection phase by asserting both
its own Initiator SCSI ID bit as well as the tape drive's SCSI ID bit (allows
the tape drive to know with which Initiator to reconnect). The Initiator
must also assert ATN before exiting the Selection phase (prior to
releasing SEL) and send an Identify message out of C0h to the tape drive.
This sequence causes the drive to enter the Message-Out phase when the
Selection phase completes.
The first message sent by the host after the Selection phase is an Identify
message. Under normal conditions, the first message sent by the tape
drive after a Reselection phase is also Identify. Under certain exceptional
conditions, the host may send the Abort message or the Bus Device Reset
message instead of Identify as the first message.
Chapter 1 SCSI Interface
Parallel SCSI Interface
11
Advertisement
Table of Contents
