Cheetah 10K.6 FC Product Manual, Rev. B

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9.5.3Electrical description

Fibre Channel drives use the FC-SCA connector for:

•DC power

•FC-AL interface

•Drive select (device identification)

•Option selection

•Enclosure Services interface

This 40-pin connector is designed to plug directly into a backpanel. External cables are not required.

9.5.4Pin descriptions

This section provides a pin-out of the FC-SCA and a description of the functions provided by the pins.

Table 20:

FC-SCA pin descriptions

 

 

 

 

Pin

 

Signal name

Signal type

 

 

 

 

 

 

 

 

1*

 

-EN bypass port A

Low Voltage

 

 

 

TTL output

 

 

 

 

2*

 

12 Volts

 

 

 

 

 

3*

 

12 Volts

 

 

 

 

 

4*

 

12 Volts

 

 

 

 

 

5*

 

-Parallel ESI

 

 

 

 

 

6*

 

Ground[1]

 

7*

 

Active LED out

Open collector out

 

 

 

 

8*

 

Reserved

 

 

 

 

 

9*

 

Start_1 [2]

TTL input

 

 

 

 

10*

 

Start_2 [2]

TTL input

 

 

 

 

11*

 

-EN bypass port B

Low Voltage

 

 

 

TTL output

 

 

 

 

12*

 

SEL_6

TTL input/output

 

 

 

 

13*

 

SEL_5

TTL input/output

 

 

 

 

14*

 

SEL_4

TTL input

 

 

 

 

15*

 

SEL_3

TTL input/output

 

 

 

 

16*

 

Fault LED out

Open collector out

 

 

 

 

17*

 

DEV_CTRL_CODE_2

TTL input

 

 

[2]

 

 

 

 

 

18*

 

DEV_CTRL_CODE_1

TTL input

 

 

[2]

 

 

 

 

 

19*

 

5 Volts

 

 

 

 

 

20*

 

5 Volts

 

 

 

 

 

Pin

Signal name

Signal type

 

 

 

 

 

 

21

12 Volts charge

 

 

 

 

22

Ground

 

 

 

 

23

Ground

 

 

 

 

24*

+Port A_in

Diff. PECL input pair

 

 

 

25*

-Port A_in

 

 

 

 

26

Ground

 

 

 

 

27*

+Port B_in

Diff. PECL input pair

 

 

 

28*

-Port B_in

 

 

 

 

29

Ground

 

 

 

 

30*

+Port A_out

Diff PECL output pair

 

 

 

31*

-Port A_out

 

 

 

 

32

Ground

 

 

 

 

33*

+Port B_out

Diff PECL output pair

 

 

 

34*

-Port B_out

 

 

 

 

35

Ground

 

 

 

 

36

SEL_2

TTL input/output

 

 

 

37

SEL_1

TTL input/output

 

 

 

38

SEL_0

TTL input/output

 

 

 

39

DEV_CTRL_CODE_0 [2]

TTL input

 

 

 

40

5 Volts charge

 

 

 

 

*Short pins in mating backpanel connector.

[1]This pin may be connected to external logic to detect the presence of the drive. The drive connects this pin to the common ground.

[2]Pins 9, 10, 17, 18, and 39 are option select pins and are tied high by the drive circuitry. The preferred elec- trical connection at the backplane is either open or grounded (open for the ‘1’ setting, grounded for the ‘0’ setting). Alternatively, these pins may be driven by a 3.3V logic device, pulled up to 3.3V through a pull-up resistor (recommended size of 10K ohm), or grounded through some other means.

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Image 65
Seagate ST373307FC, ST3146807FC, ST336607FC manual Pin descriptions, FC-SCA pin descriptions, Pin Signal name Signal type
Page 64 Page 66

ST336607FC, ST373307FC, ST3146807FC specifications

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