
Si5040
Rev. 1.3 45
Reset settings = 0101 1000
Register 2. ChipConfig1
Bit D7 D6 D5 D4 D3D2D1D0
Name losOpenDrain intOpenDrain intEnable spiOpenDrain Reserved lineside
Loopback
XFI
Loopback
refClkFreq
Type R/W R/W R/W R/W R/W R/W R/W R/W
Bit Name Function
7 losOpenDrain RX LOS Output Select.
0 = CMOS output.
1 = Open Drain.
6 intOpenDrain Interrupt Pin Drive Select.
0 = CMOS output.
1 = Open Drain.
5intEnableInterrupt Enable.
0 = Interrupts disabled.
1 = Interrupts enabled.
4 spiOpenDrain SD Pin Drive Configuration.
0=CMOS.
1 = Open Drain.
3 Reserved Do not change. Must only write a 1 to this bit.
2 lineside
Loopback
Lineside Loopback Mode Control.
0 = Normal operation.
1 = Optical data loopback.
1 XFILoopback XFI Loopback Mode Control.
0 = Normal operation.
1 = XFI loopback.
0 refClkFreq Reference Clock Frequency Select.
0 = 155 MHz.
1 = 622 MHz.
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