Table 3.16 Bidi Direction - Hitachi Ultrastar 15K73 Reference Manual

field is an 16-bit integer assigned by the application client and sent to the
The Logical nit N
I_T_L_Q nexus for the current task.
ata L
Unit. For SPI ata S
total number of bytes transferred would equal the data length times the number of
Data tream I
pad bytes (e.g., a data length of 509 with a
509 would transfer 509 bytes of data plus 3 bytes of pad plus 4 bytes of IU
a total transfer of 516 bytes).
that exceeds the maximum burst size as defined in the
The BIDI Direction
bidirectional command and the
for the BIDI Direction
Code
00b A unidirectional command or a type code other than data or
data stream
01b A bidirectional command transferring data from the host to
the controller.(Write)
10b A bidirectional command transferring data from the controller
to the host.(Read)
11b Reserved
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.
IUCRC(Information Unit CRC) is specified to be IUCRC field.
SCSI BUS
field specifies the address of the logical unit of the
field contains the length in bytes of the following I
Information
Data tream I
Units transferred).

Table 3.16 BIDI Direction

OEM MANUAL:K6602924
nits the D Length field contains the
Unit that follows (i.e., the
IUCRC nor any transmitted
CRC interval of zero or greater than
Table .16
Description
1 / Date: 200 .03 06
Page: / 273