Seagate Ultra 320 - Manual (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]
5
6
7
8
9
10
11 LSB
12 Reserved