52
Cheetah 73LP FC Product Manual, Rev. D
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
*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.
Pin
Signal name
Signal type
Pin
Signal name
Signal type
1*
-EN bypass port A
Low Voltage
TTL output
21
12 Volts charge
2*
12 Volts
22
Ground
3*
12 Volts
23
Ground
4*
12 Volts
24*
+Port A_in
Diff. PECL input pair
5*
-Parallel ESI
25*
-Port A_in
6*
Ground
[1]
26
Ground
7*
Active LED out
Open collector out
27*
+Port B_in
Diff. PECL input pair
8*
Reserved
28*
-Port B_in
9*
Start_1 [2]
TTL input
29
Ground
10*
Start_2 [2]
TTL input
30*
+Port A_out
Diff PECL output pair
11*
-EN bypass port B
Low Voltage
TTL output
31*
-Port A_out
12*
SEL_6
TTL input/output
32
Ground
13*
SEL_5
TTL input/output
33*
+Port B_out
Diff PECL output pair
14*
SEL_4
TTL input
34*
-Port B_out
15*
SEL_3
TTL input/output
35
Ground
16*
Fault LED out
Open collector out
36
SEL_2
TTL input/output
17*
DEV_CTRL_CODE_2
[2]
TTL input
37
SEL_1
TTL input/output
18*
DEV_CTRL_CODE_1
[2]
TTL input
38
SEL_0
TTL input/output
19*
5 Volts
39
DEV_CTRL_CODE_0 [2] TTL input
20*
5 Volts
40
5 Volts charge
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