Read Long Command (3E H ); Write Long Command (3F H ) - Seagate MEDALIST 1080SL Product Manual

Medalist 1080sl SCSI Product Manual, August 1995
3.5.9.1 Read Buffer Header
The following table shows the structure of the 4-byte Read Buffer Header.
Bytes
7 6
0
1–3
Bytes 1–3 The buffer capacity field specifies the size of the drive
buffer. Byte 1 is MSB; byte 3 is LSB.
3.5.10 Read Long command (3E
When the drive receives the Read Long command, it transfers data to
the initiator.
Bytes
7 6
0 0 0
1 LUN
2–5
6 0 0
7–8
9 0 0
Bytes 2–5 The logical block address specifies the LBA where the drive
begins reading data.
Bytes 7–8 The byte transfer length specifies the number of bytes
transferred to the initiator. The drive transfers the logical
block size plus eleven. If the byte transfer length is zero, the
drive does not transfer any data to the initiator. This condi-
tion is not considered an error.
Transfer length must be 523 (20B
3.5.11 Write Long command (3F
When the drive receives the Write Long command, it writes one logical
block of data and eleven bytes of error correction code (ECC) to the disc.
During this command, the drive does not perform any ECC verification.
Bits
5 4 3 2
0
Buffer capacity
)
H
Bits
5 4 3 2
1 1 1 1
0 0 0
Logical block address
0 0 0 0
Byte transfer length
0 0 0 0
) Bytes.
H
)
H
63
1 0
1 0
1 0
0 0
0 0
0 0