SimpleTech ZeusIOPS manual SELN/PESIN Signal Definitions, SFF-8045 Enclosure Service Interface

17	C5	37	81	57	4C	77	17
18	C3	38	80	58	4B	78	10
19	BC	39	7C	59	4A	79	F
1A	BA	3A	7A	5A	49	7A	8
1B	B9	3B	79	5B	47	7B	4
1C	B6	3C	76	5C	46	7C	2
1D	B5	3D	75	5D	45	7D	1
1E	B4	3E	74	5E	43	7E	NA
1F	B3	3F	73	5F	3C	7F	SOFT

P_ESI_n FUNCTION

The SEL_N (TTL compatible) inputs and outputs (defined when -Parallel ESI is asserted) provide an interface between the enclosure and the drive. Table 8 summarizes the signals.

Table 8. SEL_N/P_ESI_N Signal Definitions

-Parallel ESI (High)	-Parallel ESI (Low)
Sel_0 (Input)	P_ESI_0 (Input)
Sel_1 (Input)	P_ESI_1 (Input)
Sel_2 (Input)	P_ESI_2 (Input)
Sel_3 (Input)	P_ESI_3 (Input)
Sel_4 (Input)	P_ESI_4 (Input)
Sel_5 (Input)	P_ESI_5 (Input)
Sel_6 (Input)	-EFW (Input)

SFF-8045 ENCLOSURE SERVICE INTERFACE

The SFF-8045 Enclosure Service Interface defines 7 bits of enclosure status. This status is read by the drive, and presented to the Initiator, upon receipt of appropriate Receive Diagnostic command. The definitions of the status bits are vendor specific. The drive will not interpret the status. The drive assumes -EFW is status and treats it as if does the other P_ESI_n signals.

-ENBL_BYP CH1 AND -ENBL_BYP_CH2

These two signals are TTL outputs from the drive and provide 4mA of sink capability. The signals are intended to control the state of the loop port bypass circuit on the backplane. The drive powers up with these signals turned off. It is assumed that the backplane will provide a 1K ohm pull-down resistor that will ensure the drive is bypassed on the loop when it is not present, or when it is powering up. The drive will attempt to enable itself on both loops after a successful power up.

START_n MATED

These signals are used to control the motor spin on rotating media drives. Because the ZeusIOPS SSD is a solid-state device and has no motor, these signals are ignored by the drive.

ZeusIOPS 3.5-Inch Fibre Channel Solid State Drive Product Manual Rev. 1.0 31