-DRIVE PRESENT
This signal is connected to the ground plane of the drive. The backplane can use this signal to detect the presence of the drive.
DEV_CTRL_CODE_X
The DEV_CTRL_CODE_2 through DEV_CTRL_CODE_0 signals provide a binary code to the drive to control functions such as FC link rate, Power Failure Warning (PFW) and Hard Reset. The control function is either identified by a code or a sequence of codes on the DEV_CTRL_CODE signals.
Table 9 lists the functions and the associated codes that use a decode 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 and 5. A drive detecting a valid Hard Reset sequence shall perform the equivalent of a
4.7K ohm
DEV_CTRL_CODE_1 and DEV_CTRL_CODE_0 to ensure that each signal is maintained in its high state unless a low is provided from the backplane.
Note: Please refer to the
Table 9. DEV_CTRL_CODE_N Signal Definitions
| DEV_CTRL_CODE_N | ||
|
|
|
|
Link Rate | CODE_2 | CODE_1 | CODE_0 |
|
|
|
|
1.0625 GHz | 1 | 1 | 1 |
|
|
|
|
2.1250 GHz | 1 | 1 | 0 |
|
|
|
|
Reserved | 1 | 0 | 1 |
|
|
|
|
Reserved | 1 | 0 | 0 |
|
|
|
|
Reserved | 0 | 1 | 1 |
|
|
|
|
Reserved | 0 | 1 | 0 |
|
|
|
|
Reserved | 0 | 0 | 1 |
|
|
|
|
Power Failure Warning | 0 | 0 | 0 |
|
|
|
|
32 | ZeusIOPS |
