SCSI Description

 

 

 

Table 3–2

Signal Sources

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bus Phase

BSY

SEL

C/D

I/O

ACK ATN

DB(7–0)

DB(15-8)

 

 

 

 

MSG REQ

 

DB(P)

DB(P1)

 

 

 

 

 

 

 

 

 

 

BUS FREE

None

None

None

None

None

None

 

ARBITRATION

All

Winner

None

None

S ID

S ID

 

SELECTION

I&T

Init

None

Init

Init

Init

 

RESELECTION

I&T

Targ

Targ

Init

Targ

Targ

 

COMMAND

Targ

None

Targ

Init

Init

None

 

DATA IN

Targ

None

Targ

Init

Targ

Targ

 

DATA OUT

Targ

None

Targ

Init

Init

Init

 

STATUS

Targ

None

Targ

Init

Targ

None

 

MESSAGE IN

Targ

None

Targ

Init

Targ

None

 

MESSAGE OUT

Targ

None

Targ

Init

Init

None

 

All:

The signal is driven by all SCSI devices that are actively arbitrating.

SCSI ID:

Each SCSI device that is actively arbitrating asserts its unique SCSI ID bit. The other

 

seven (or fifteen) data bits are released. The parity bit DB(P or P1) can be released or

 

driven true, but is never driven false during this phase.

I&T:

The signal is driven by the initiator, drive, or both, as specified in the SELECTION and

 

RESELECTION phase.

Init:

If driven, this signal is driven only by the active initiator.

None:

The signal is released; that is, not driven by any SCSI device. The bias circuitry of the

 

bus terminators pulls the signal to the false state.

Winner:

The signal is driven by the winning SCSI device.

Targ:

If the signal is driven, it is driven only by the active drive.

3.3.2 SCSI ID Bits

SCSI permits a maximum of eight SCSI devices on a SCSI bus (16 devices are permitted when using wide SCSI). Each SCSI device has a unique SCSI ID assigned to it. This SCSI ID provides an address for identifying the device on the bus. On the drive, the SCSI ID is assigned by configuring jumpers or connecting remote switches to the option connector. Chapter 2, Hardware Implementation has full instructions for setting the SCSI ID.

Quantum DLT 7000 Tape System

3-5

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Quantum Instruments DLT 7000 manual Scsi ID Bits, Signal Sources, Command
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