SCSI Description

NOTES

In contrast to the BUSY status condition, the DRIVE NOT READY Sense Key is returned as part of the Sense data following a REQUEST SENSE command and indicates that a media access command has been issued but that the media is not ready to be accessed. For example, the tape cartridge is not installed, the tape medium has been unloaded, the tape drive is currently initializing the tape medium to prepare it for access, etc.).

In the DRIVE NOT READY state, the initiator cannot perform any operation that would cause tape motion (READ, WRITE, VERIFY, for example). These commands return a CHECK CONDITION status with a DRIVE NOT READY sense key. The initiator may execute commands that do not require tape motion or access to the tape medium, and a GOOD status may be the result.

3.6SCSI BUS CONDITIONS

The SCSI bus has two asynchronous conditions: Attention and Reset.

3.6.1 Attention Condition

The attention condition informs a drive that an initiator has a message ready. The drive gets the message by performing a MESSAGE OUT phase. The attention condition requires the following timing:

∙The initiator creates the attention condition by asserting ATN at any time except during the ARBITRATION or BUS FREE phases.

∙The initiator negates the ATN signal at least two deskew delays before asserting the ACK signal while transferring the last byte of the message.

∙If the drive detects that the initiator failed to meet this requirement, then the drive goes to BUS FREE.

∙Before transition to a new bus phase, the initiator asserts the ATN signal, then waits at least two deskew delays before negating the ACK signal for the last byte transferred in the current bus phase. Asserting the ATN signal later cannot be honored until a later bus phase and then cannot result in the expected action.

The drive responds with MESSAGE OUT as described in the following table:

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Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Scsi BUS Conditions
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DLT 7000 specifications

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