Seagate ST3300056FC (FDE) 사용자 설명서
70
Cheetah 15K.6 FC Product Manual, Rev. C
Table 27:
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 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.
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.
9.5.5
FC-AL transmitters and receivers
A typical FC-AL differential copper transmitter and receiver pair is shown in Figure 17. The receiver is required
to provide the AC coupling to eliminate ground shift noise.
to provide the AC coupling to eliminate ground shift noise.
Figure 17. FC-AL transmitters and receivers
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
FC Diff. input pair
5*
-Parallel ESI
25*
-Port A_in
6*
Ground
26
Ground
7*
Active LED out
Open collector out
27*
+Port B_in
FC Diff. input pair
8*
Reserved
28*
-Port B_in
9*
Start_1
TTL input
29
Ground
10*
Start_2
TTL input
30*
+Port A_out
FC Diff. 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
FC Diff. 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
TY
.01
Differential
Transfer Medium
.01
Transmitter
TX
RY
Receiver
RX
100
100