Product manual

Cheetah 36LP FC Product Manual, Rev. C 55
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 20: 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.
Pin Signal name Signal type Pin Signal name Signal type
1* -EN bypass port A 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 TTL input 29 Ground
10* Start_2 TTL input 30* +Port A_out Diff PECL output pair
11* -EN bypass port B 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 TTL input 37 SEL_1 TTL input/output
18* DEV_CTRL_CODE_1 TTL input 38 SEL_0 TTL input/output
19* 5 Volts 39 DEV_CTRL_CODE_0 TTL input
20* 5 Volts 40 5 Volts charge