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112
Table 50:
BIDI Direction
Codes
Description
00b
A unidirectional command or a type code other than data or data stream (see Table 49).
01b
A bidirectional command transferring data from the SCSI initiator device to the SCSI target
device.
10b
A bidirectional command transferring data from the SCSI target device to the SCSI initiator
device.
11b
Reserved.
[6]
The iuCRC Interval field contains the length in bytes of the data to be sent before a iuCRC is transferred.
The iuCRC interval length shall not include the 4 byte iuCRC nor any transmitted pad bytes (e.g., an
iuCRC interval length of 510 transfer 510 bytes of data plus 2 bytes of pad plus 4 bytes of iuCRC for a total
transfer of 516 bytes). The iuCRC interval shall be a multiple of two (i.e., odd numbers are not allowed). If
the iuCRC interval is equal to zero or is greater than or equal to the data length only one iuCRC shall
occur at the end of the SPI information unit.
[7]
The iuCRC field shall use the algorithm defined in Subsection 11.3 of the ANSI SCSI Parallel Interface
(SPI-4).
SCSI Interface Product Manual, Rev. B
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