Fc-Al Transmitters And Receivers - Seagate SAVVIO 10K.5 FC ST9300605FC Product Manual

Table 25: 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
[2]
9* Start_1
[2]
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.
[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.
10.5.5

FC-AL transmitters and receivers

A typical FC-AL differential copper transmitter and receiver pair is shown in Figure 15. The receiver is required
to provide the AC coupling to eliminate ground shift noise.
TX
Transmitter
100
TY
Figure 15. FC-AL transmitters and receivers
70
Signal type
Low Voltage TTL output
Open collector out
TTL input
TTL input
Low Voltage TTL output
TTL input/output
TTL input/output
TTL input
TTL input/output
Open collector out
[2]
TTL input
[2]
TTL input
.01
Differential
Transfer Medium
.01
Pin Signal name
21 12 Volts charge
22 Ground
23 Ground
24* +Port A_in
25* -Port A_in
26 Ground
27* +Port B_in
28* -Port B_in
29 Ground
30* +Port A_out
31* -Port A_out
32 Ground
33* +Port B_out
34* -Port B_out
35 Ground
36 SEL_2
37 SEL_1
38 SEL_0
39 DEV_CTRL_CODE_0
40 5 Volts charge
RX
Receiver
100
RY
Savvio 10K.5 FC Product Manual, Rev. D
Signal type
FC Diff. input pair
FC Diff. input pair
FC Diff. output pair
FC Diff. output pair
TTL input/output
TTL input/output
TTL input/output
[2
TTL input