Led Driver Signals; Fc Differential Output; Fc Differential Input - Seagate CHEETAH NS 10K.2 FC ST3600002FC Product Manual

9.6.2

LED driver signals

Fault and Active LED signals are located in the FC-SCA connector (J1). See Table 29 for the output character-
istics of the LED drive signals.
Table 29: LED drive signal
State
LED off, high
LED on, low
9.6.3

FC Differential output

The serial output signal voltage characteristics are provided in Table 30. The outputs are not AC coupled in
order to deliver maximum signal without rise and fall time degradation. You must AC couple the receiver to iso-
late potentially different DC characteristics of the outputs and the receiver.
Table 30: FC Differential output characteristics
Description
Serial output voltage swing
Figure 15 provides the data output valid eye diagram relative to the bit cell time.
Figure 15. Transmit eye diagram
9.6.4

FC Differential input

The serial input signal voltage characteristics are provided in Table 31.
Table 31: FC Differential input characteristics
Description
Serial input voltage swing
72
Current drive available
0 < I < 100µA
OH
I < -30 mA
OL
Parameter
600 < V < 1300 mV
out
Bit Time
XMIT Eye
Parameter
200 < V < 1.300 mV
in
Output voltage
0 < V < 0.8V
OL
Notes
Centered at 1.32V
Cheetah NS 10K.2 FC Product Manual, Rev. B
Notes
AC coupled