Seagate Ultra 320 User Manual download pdf (Page 135)

Parallel SCSI Interface Product Manual, Rev. A 121

Management Flags field is not zero. Any bytes between the end of a 6 byte CDB, 10 byte CDB, or 12 byte

CDB and the end of the CDB

field shall be reserved.

[6] The Additional CDB field contains any CDB bytes beyond those contained within the standard 16 byte

CDB field.

[7] The CDB, Additional CDB, and Task Attribute fields are not valid and are ignored if the Task Management

Flags

field is not zero.

[8] The contents of the CDB and Additional CDB fields shall be as defined in the SCSI command standards.

[9] The iuCRC field shall use the algorithm defined in Subsection 11.3 of ANSI SCSI Parallel Interface (SPI-

5).

6.2.2 SPI L_Q information unit

The SPI L_Q information unit (see Table 49) contains L_Q nexus (Logical unit—Q tag relationship) information

for the information unit that follows, the type of information unit that follows, and the length of information unit

that follows. A SPI L_Q information unit shall precede all SPI command information units, SPI multiple com

mand information units, SPI data information units, SPI status information units, and the first of an uninter-

rupted sequence of SPI data stream information units.

The receipt of an error free (i.e., no iuCRC error) SPI L_Q information unit by a SCSI initiator port shall cause

the initiator to restore the data pointer.

Table 49: SPI L_Q information unit

Bit

Byte

7 6 5 4 3 2 1 0

0 Type [1]

1 Reserved

2 MSB

Tag [2 ]

3 LSB

4 MSB

Logical Unit Number [3]

11 LSB

12 Reserved

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 185 186

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Seagate Ultra 320 User Manual Page 135