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9.5.3
Electrical 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.
9.5.4
Pin descriptions
This section provides a pin-out of the FC-SCA and a description of the functions provided by the pins.
Table 19:
FC-SCA pin descriptions
Pin
Signal name
1*
-EN bypass port A
2*
12 Volts
3*
12 Volts
4*
12 Volts
5*
-Parallel ESI
[1]
6*
Ground
7*
Active LED out
8*
Reserved
9*
Start_1
10*
Start_2
11*
-EN bypass port B
12*
SEL_6
13*
SEL_5
14*
SEL_4
15*
SEL_3
16*
Fault LED out
17*
DEV_CTRL_CODE_2
18*
DEV_CTRL_CODE_1
19*
5 Volts
20*
5 Volts
*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.
Signal type
Pin
TTL output
21
22
23
24*
25*
26
Open collector out
27*
28*
TTL input
29
TTL input
30*
TTL output
31*
TTL input/output
32
TTL input/output
33*
TTL input
34*
TTL input/output
35
Open collector out
36
TTL input
37
TTL input
38
39
40
Cheetah 73FC Product Manual, Rev. C
Signal name
12 Volts charge
Ground
Ground
+Port A_in
-Port A_in
Ground
+Port B_in
-Port B_in
Ground
+Port A_out
-Port A_out
Ground
+Port B_out
-Port B_out
Ground
SEL_2
SEL_1
SEL_0
DEV_CTRL_CODE_0
5 Volts charge
Signal type
Diff. PECL input pair
Diff. PECL input pair
Diff PECL output pair
Diff PECL output pair
TTL input/output
TTL input/output
TTL input/output
TTL input
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