Sony DDS-4, Product Description Manual

Page: 149 / 177

6 - 98 SONY SDT-10000/SDT-11000 DDS Tape Drive
6. COMMAND SPECIFICATION
6. 27 WRITE 0Ah
Bit 7 6 5 4 3 2 1 0
Byte
0 Operation Code (0Ah)
1 Logical Unit Number Reserved Fixed
2 (MSB)
3 Transfer Length
4 (LSB)
5 Unused (00b) Reserved
WRITE transfers one or more blocks from the Host to the tape beginning at the current logical position.
Fixed:
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 set to zero, Variable Block mode is selected. The Transfer Length specifies the maximum number
of bytes that the drive handshakes out from the initiator. A single block is transferred from the initiator and is
written beginning at the current logical tape position. Upon successful termination, the tape is logically positioned
after this block (EOM/P side). The Transfer Length specifies the maximum number of bytes that the drive hand-
shakes out from the initiator.
If the Fixed Bit is set to one, the Transfer Length field specifies the number of blocks to be transferred to the drive,
beginning at the current logical position. This is valid only if the drive is currently operating in Fixed Block mode,
in other words, when it has been instructed to use fixed-length blocks with MODE SELECT. The current block
length is the block length defined in the MODE SELECT command. Upon termination, the tape is logically posi-
tioned after these blocks (EOM/P side).
If EOT is detected while writing, the drive will finish writing any buffered data. The command will terminate with
CHECK CONDITION status. Within the Sense data, the EOM bit is set, the Sense Key field is set to NO SENSE and the
Additional Sense Code and Additional Sense Code Qualifier fields are set to EOM/P detected. The drive will attempt to
complete any subsequent writes, returning a CHECK CONDITION status in each case.
WRITE