Fujitsu MAS3367, MAP3367, MAP3147, MAS3735, MAP3735 specifications Command Format, Lun

CHAPTER 1 Command Processing

1.1Command Format

1.2Status Byte

1.3Outline of Command Processing

1.4Command Queuing Function

1.5UNIT ATTENTION Condition

1.6Sense Data Hold State

1.7Command Processing Exceptions

1.8Data Block Addressing

This chapter describes the basic logical specifications of the IDD command processing functions.

Note: The IDD operates as the target (TARG) on the SCSI bus. In the explanations in this chapter, the IDD is mentioned as “TARG”, except in cases where a particularly clear distinction is necessary.

1.1Command Format

Input/output operation commands from INIT (initiator) to the IDD are accomplished by the CDB (Command Descriptor Block). The CDB is information transferred from INIT to TARG in the COMMAND phase. In a number of commands, the parameters which are necessary for command execution in the DATA OUT phase may be specified in addition to the CDB specification. Details concerning these are described in the specifications for each individual command in Chapter 3.

The CDB used by the IDD has 3 formats, these formats have length of 6, 10 and 12 bytes. The basic format of each respective CDB is shown in Figures 1.1, 1.2 and 1.3.

Byte	Bit	7	6	5		4	3	2	1	0
	0					Operation Code
	1		LUN				Logical Block Address (MSB)
	2				Logical Block Address
	3				Logical Block Address (LSB)
	4				Transfer Data Length
	5				Control Byte

Figure 1.1 6-Byte CDB Basic Format

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