Seagate ST300MM0026 Savvio 10K.4 FC Product Manual - Page 72

LED driver signals, FC Differential output, FC Differential input

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9.6.2 LED driver signals Fault and Active LED signals are located in the FC-SCA connector (J1). See Table 27 for the output characteristics of the LED drive signals. Table 27: LED drive signal State LED off, high LED on, low Current drive available 0 < IOH < 100µA IOL < -30 mA Output voltage 0 < VOL < 0.8V 9.6.3 FC Differential output The serial output signal voltage characteristics are provided in Table 28. 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 isolate potentially different DC characteristics of the outputs and the receiver. Table 28: FC Differential output characteristics Description Serial output voltage swing Parameter 600 < Vout < 1300 mV Notes Centered at 1.32V Figure 13 provides the data output valid eye diagram relative to the bit cell time. Bit Time Vout (mv) XMIT Eye Figure 13. Transmit eye diagram 9.6.4 FC Differential input The serial input signal voltage characteristics are provided in Table 29. Table 29: FC Differential input characteristics Description Serial input voltage swing Parameter 200 < Vin < 1.300 mV Notes AC coupled 66 Savvio 10K.4 FC Product Manual, Rev. A

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66
Savvio 10K.4 FC Product Manual, Rev. A
9.6.2
LED driver signals
Fault and Active LED signals are located in the FC-SCA connector (J1). See Table 27 for the output character-
istics of the LED drive signals.
9.6.3
FC Differential output
The serial output signal voltage characteristics are provided in Table 28. 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.
Figure 13 provides the data output valid eye diagram relative to the bit cell time.
Figure 13.
Transmit eye diagram
9.6.4
FC Differential input
The serial input signal voltage characteristics are provided in Table 29.
Table 27:
LED drive signal
State
Current drive available
Output voltage
LED off, high
0 < I
OH
< 100μA
LED on, low
I
OL
< -30 mA
0 < V
OL
< 0.8V
Table 28:
FC Differential output characteristics
Description
Parameter
Notes
Serial output voltage swing
600 < V
out
< 1300 mV
Centered at 1.32V
Table 29:
FC Differential input characteristics
Description
Parameter
Notes
Serial input voltage swing
200 < V
in
< 1.300 mV
AC coupled
Bit Time
Vout (mv)
XMIT Eye