5.1.1 Operation Code; Table 5-3 Standard Command Descriptor Block For 12-Byte Commands; Table 5-4 Operation Code - Hitachi DK32EJ - Ultrastar Series 36.9 GB Hard Drive Reference Manual

Table 5-3 Standard Command Descriptor Block for 12-byte Commands

Bit
Byte
0
1 Logical Unit Number
2
3
4
5
6
7
8
9
10
11

5.1.1 OPERATION CODE

Table 5-4 shows the format of the operation code.
Bit
Byte
0
The Operation Code consists of the group code and the command code.
5 SCSI COMMANDS
7 6 5
Logical Block Address (MSB)
Logical Block Address (LSB)

Table 5-4 Operation Code

7 6 5
Group Code
4 3
Operation Code
Reserved
Logical Block Address
Logical Block Address
Transfer Length (MSB)
Transfer Length
Transfer Length
Transfer Length (LSB)
Reserved
Control Byte
4 3
Command Code
OEM MANUAL:K6602771
2 1 0
RelAdr
2 1 0
Revision: 2 / Date: 2002.12.19
Page: 105 / 313