SCSI Description

3.5.5Information Transfer Phases

NOTES

1.The tape drive supports wide asynchronous and synchronous data transfers.

2.Both differential and single-ended versions of the tape drive are available.

3.Odd parity is generated during all information transfer phases during which the device writes data to the SCSI bus, and parity is checked during all transfer phases in which data is read from the bus by the tape drive. Parity checking can be disabled (Chapter 2).

4.The ANSI SCSI specification refers to mini-libraries as “medium changers.” In this chapter the term “mini-libraries” is used to describe these devices.

5.The DLT 7000 supports block size of 1 byte to 16 Mbytes.

6.Disconnects from the SCSI bus are done at regular intervals during information transfer phases to allow other devices to access the bus. These disconnects are user-configurable via the Disconnect-Reconnect Page of the SCSI MODE SELECT command.

7.The tape drive does not act as an initiator on the SCSI bus. Therefore, the drive does not 1) generate unsolicited interrupts to the bus, 2) initiate its own SCSI commands, and 3) assert bus reset.

8.A mini-library subsystem is assigned two logical unit numbers (LUNs): the tape drive is always LUN 0, and the mini-library component has a default LUN of 1, but may be reconfigured to any LUN from 0 to 15 via the SCSI MODE SELECT command.

The COMMAND, DATA, STATUS, and MESSAGE phases are known as the Information Transfer Phases because they are used to transfer data or control information.

The C/D, I/O, and MSG signals are used to distinguish between the different information transfer phases (Table 3−5). The drive asserts these three signals and so controls all information transfer phase changes. The drive can also cause a BUS FREE phase by releasing the MSG, C/D, I/O, and BSY signals. The initiator can request a MESSAGE OUT phase by asserting the ATN signal.

Quantum DLT 7000 Tape System

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Quantum Instruments manual Information Transfer Phases, DLT 7000 supports block size of 1 byte to 16 Mbytes
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DLT 7000 specifications

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