SimpleTech ZeusIOPS manual Drive Present, Devctrlcodex, Devctrlcoden Signal Definitions, Link Rate

-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 power-on reset.

4.7K ohm pull-up resistors to 3.3V are provided on the drive for both DEV_CTRL_CODE_2,

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 SFF-8045 Specification for more information.

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 3.5-Inch Fibre Channel Solid State Drive Product Manual Rev. 1.0