Seagate Ultra 320 - Manual (Page 16)

2 Parallel SCSI Interface Product Manual, Rev. A
1.1.1 Scope of SCSI standards
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.
Figure 1. Functional scope of SCSI 1 standards
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)