9.6.2LED driver signals

Fault and Active LED signals are located in the FC-SCA connector (J1). See Table 25 for the output character- istics of the LED drive signals.

Table 25: LED drive signal

State

Current drive available

Output voltage

 

 

 

LED off, high

0 < IOH < 100µA

 

 

 

 

LED on, low

IOL < -30 mA

0 < VOL < 0.8V

 

 

 

9.6.3FC Differential output

The serial output signal voltage characteristics are provided in Table 26. 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 26:

FC Differential output characteristics

 

 

 

 

Description

Parameter

Notes

 

 

 

Serial output voltage swing

600 < Vout < 1300 mV

Centered at 1.32V

 

 

 

 

Figure 10 provides the data output valid eye diagram relative to the bit cell time.

Bit Time

Vout (mv)

XMIT Eye

Figure 10. Transmit eye diagram

9.6.4FC Differential input

The serial input signal voltage characteristics are provided in Table 27.

Table 27:

FC Differential input characteristics

 

 

 

 

Description

Parameter

Notes

 

 

 

Serial input voltage swing

200 < Vin < 1.300 mV

AC coupled

 

 

 

 

64

Barracuda ES.2 FC Product Manual, Rev. B

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Seagate ES.2 FC, ST31000640FC manual LED driver signals, FC Differential output, FC Differential input

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