Seagate Ultra 320 ユーザーズマニュアル

2  

                                                      Parallel SCSI Interface Product Manual, Rev. A 

Figure  1 uses a representative set of specifications to show the functional partitions and the relationships 
among SCSI standards applicable to drives covered by this manual.

1

The functional areas define the scope of each standard as follows:
• SCSI Architecture Model: Defines the SCSI systems model, the functional partitioning of the SCSI standard 

set and requirements applicable to all SCSI implementations and implementation standards.

• Commands: Implementation standards which define classes including a device model for each class. These 

standards specify the required commands and behavior that is common to all devices or unique to a given 
class of devices and prescribe the rules to be followed by a SCSI initiator port when sending commands to a 
device.

• Common Access Method: Implementation standard which defines a host architecture and set of services for 

device access.

• Protocols: Implementation standards which define the rules for exchanging information so that different 

SCSI devices can communicate.

• Interconnects: Implementation standards which define the electrical and signaling rules essential for devices 

to interoperate over a given physical interconnect.

1

 The diagram of Figure 1 shows how the standards listed below fit within each category. The standards 

included in the diagram are meant to serve as examples and may not reflect the full set of standards currently 
in force.

SCSI Block

Commands (SBC)

SCSI Primary

Commands (SPC)

SCSI

Fibre Channel

Protocol (FCP)

Fibre Channel

Physical and Signaling

Interface (FC-PH)

SCSI Architecture Model (SAM)

Common Access Method (CAM)

Commands

Protocols

Interconnects

SCSI

Interlocked

Protocol

and

SCSI

Parallel

Interface (SPI-3)