Hitachi ULTRASTAR 15K450 HUS154530VLF400 Specifications page 40

decode of the value on the DEV_CTRL_CODE signals.
The Hard Reset function uses a sequence of values on the DEV_CTRL_CODE signals. The sequence is 5, 1, 3, 2, 3, 1, 5. A
drive detecting a valid Hard Reset sequence shall perform the equivalent of a power-on-reset.
10 Kohm pull up resistors to 3.3 VOLTS are provided on the drive for both DEV_CTRL_CODE_ 2, DEV_CTRL_CODE_1
and DEV_CTRL_CODE_0 to be sure that each signal is maintained in its high state unless a low is provided from the back-
plane.
For more information refer to the SFF-8045 Specification.
Table 16: DEV_CTRL_CODE_N Signal Definition
Link Rate
1.0625 GHz
2.1250 GHz
4.250 GHz
Reserved
Reserved
Reserved
Reserved
Power Failure Warning
DEV_CTRL_CODE_2 DEV_CTRL_CODE_1 DEV_CTRL_CODE_0
1
1
1
1
0
0
0
0
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
1
1
0
0
1
1
0
0
24
1
0
1
0
1
0
1
0