Motorola MPMC101 Service Manual download pdf (Page 19)

Introduction to SCSI-2

1-7

Introduction to SCSI-2

SCSI (Small Computer System Interface) is an I/O bus protocol that

provides high performance, peer-to-peer data communications for

up to 16 devices, including one or more host computers. The main

advantage for using SCSI-2 is that all the initialization information

is stored within the SCSI-2 device. The hostÕs operating system can

obtain all the pertinent information about the device without

referencing external setup files or software drivers.

All SCSI devices are required to operate using asynchronous data

transfers. Synchronous transfers are optional, and negotiated

between the host and target during power-up.

Single-Target Conﬁguration

In a SCSI-2 system, a computer with a host-adapter serves as the

primary initiator for all actions on the SCSI bus. All other devices

connected to the bus are SCSI targets. Figure 1-3 illustrates a simple

configuration where a host computer is connected to a single target,

a disk drive with an embedded SCSI controller. The controller can

be a stand-alone device with multiple peripherals as shown in

Figure 1-4.

Figure 1-3. Single Initiator, Single Target Systems

Host Computer

Disk Drive

Computer

Host

Adapter

SCSI BUS

Peripheral

SCSI

Controller

11709 9701

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Motorola MPMC101 Service Manual Page 19