Maxtor 10K III manual Length Fields, Definition, Out

SCSI Description

￿￿￿#Many￿6TCPUHGTof the SCSI￿%QOOCPFcommands￿%QORQPGPVUcause data to be transferred between the initiator and the drive. The content and characteristics of this data are command-dependent. Table 5-8lists the information transmitted for all of the commands.

The “Length in CDB” column of Table 5-8identifies the Command Descriptor Block field used by the drive to determine how much command-related data are to be transferred. The units (bytes or logical blocks) for the different Length fields are implied by the Length Field Name as shown in Table 5-7:

			Length Fields
%QOOCPFCHANGE		.GPIVJ0￿KP￿%&$Table&CVC5-7￿1WV￿￿--6Q￿&TKXG￿		&CVC￿+P￿￿6Q--￿+PKVKCVQT￿
	Allocation Length		Bytes of data the drive is allowed to send to the initiator
	Parameter List Length		Bytes of data the initiator has available for the drive
	Transfer Length		Logical data sectors the initiator wants transferred or verified
	Byte Transfer Length		Bytes of data the initiator wants transferred

The DATA OUT column in Table 5-8lists the information passed to the drive by the initiator as part of the command. The DATA IN column lists the information sent to the initiator by the drive.

Numbers in parentheses after an item indicate the item’s length in bytes. In some cases, additional length information is communicated during the DATA phase. For example, a FORMAT UNIT Defect List Header contains a Defect List Length field that contains the total length of the Defect Descriptors that follow the Defect List Header. Table 5-8does not include these cases.

	(KGNF￿0COG		DATA-Phase Command7PKVUContents￿+ORNKGF
DEFINITION
			Defect List Header
FORMAT UNIT		0	Initialization Pattern (6-8)
			Defect Descriptors
INQUIRY		Allocation	---	Standard Inquiry or a Vital Prod-
				uct Data page
LOG SELECT		Parameter List	--	--
		(must be 0)
LOG SENSE		Allocation	---	Log Page
		Parameter List	Mode Parameter Header
MODE SELECT			(4 Block Descriptor (8	--
			Page(s))
MODE SENSE		Allocation	---	Block Descriptor (8)
PERSIST. RES. IN
PERSIST. RES.		Table5-8
OUT
READ (6) (10)		Transfer	---	Data

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