Fujitsu MCM3064SS Manual Do Utilizador

C156-E228-02EN 7-1 

 

 

 

 

 

 

 

This chapter describes the structure of the SCSI bus, electrical conditions, 
interface protocol and their operations. 

 

The ODD operates on the SCSI bus as a TARG.  In this chapter, the 
ODD is represented as "TARG" except where some special 
distinction must be made. 

Up to eight SCSI devices can be connected to the SCSI bus.  Figure 7.1 shows a 
sample system configurations of a multi-host system.  Number of devices to be 
connected is restricted according to the synchronized transfer speed.  Refer to the 
related specifications for detail.  Communication on the SCSI bus is allowed 
between only two SCSI devices, an initiator (INIT) and a target (TARG), at any 
given time. 

In the configured system, any combination is allowed for an SCSI device to work 
as an INIT and as a TARG.  Also, there may be an SCSI device that works as both 
an INIT and a TARG. 

A unique address (SCSI ID) is assigned to each SCSI device.  The SCSI ID 
corresponds to one bit of the SCSI data bus.  The INIT designates an I/O device 
connected to the TARG by its logical unit number (LUN). 

The SCSI ID of the ODD can be selectable among #0 to #7, but the LUN is fixed 
to #0. 

7.1 System 

Configuration 

7.2 

Interface Signal Definition 

7.3 Physical 

Requirements 

7.4 Electrical 

Requirements 

7.5 Timing 

Rule 

7.6 Bus 

Phases 

7.7 Bus 

Conditions 

7.8 Bus 

Sequence