4-3.31 Write Command 0Ah; 4-3.31.1 Write Cdb Description; 4-3.31.2 Write Check Condition Status; Table 4-128. Write Field Description - Fujitsu M2488 Product Manual

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TAPE UNIT SCSI COMMANDS
4-3.31
WRITE command 0Ah
The WRITE command transfers one or more blocks from the initiator to the current position on the
logical unit.
4-3.31.1
WRITE CDB Description
WRITE is a six-byte command. The bytes are as shown below and described in Table 4-128.
Common fields are described in paragraph 4-3.1 on page 4-4.
BYTES
7
0
0
1
2
MSB
3
4
5
Note: Changeable fields in the CDB are shaded.
BYTE
BIT
VALUE
0
0-7
1
0
2-4
4-3.31.2
WRITE CHECK CONDITION Status
This control unit implements both fixed-block and variable-block modes. Reference the Read
Block Limits and Mode Select (mode parameters block descriptor) commands for more informa-
tion about fixed and variable block modes. If the Fixed bit is one and the current mode is variable
(as set by MODE SELECT command or default power on condition) the command is rejected with
4-140
6
5
4
0
0
0
LUN
Transfer Length
Reserved

Table 4-128. WRITE Field Description

0Ah
Operation code.
The Fixed bit specifies both the meaning of the transfer length field and
whether fixed-length or variable-length blocks are to be transferred.
If the Fixed bit is zero, a single block is transferred with the bytes trans-
ferred being the lesser of the actual block length or the requested transfer
length.
If the Fixed bit is one, the transfer length specifies the number of blocks to
be transferred to the initiator.
The Transfer Length indicates the number of bytes or blocks to transfer.
The block length used is the current block length specified in the mode
parameters block descriptor (refer to the Mode Select Block Descriptor in
Table 4-47 on page 4- 53.)
When the transfer length is zero, no data is transferred and the current
position on the logical unit is not changed. This condition is not considered
an error.
CG00000-011503 REV. A
M2488 PRODUCT GUIDE
BITS
3
2
1
0
Reserved
DESCRIPTION
1
0
1
0
Fixed
LSB
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Link
April 1997

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