Electrical Description; Pin Descriptions - Seagate Cheetah ST336605FC/FCV Product Manual

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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 [2]
10* Start_2 [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
[2]
18* DEV_CTRL_CODE_1
[2]
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.
[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.
Signal type Pin
Low Voltage 21
TTL output
22
23
24*
25*
26
Open collector out 27*
28*
TTL input 29
TTL input 30*
Low Voltage 31*
TTL output
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 73LP FC Product Manual, Rev. D
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 [2] TTL input
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