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There is a Silicon Labs I²C programmable clock generator on-board (Si5345A, U2) to generate reference clocks for the module.

Not connected.

Si5345A Pin	Signal Name / Description	Connected To	Direction	Note
IN0	Reference input clock.	U1	Input	25.000000 MHz oscillator, Si8208AI
IN1	-	Not connected.	Input	Not used.
IN2	-	Not connected.	Input	Not used.
IN3	CLK2	J2-K4/K5	Input	HPC FMC configured as C2M clock.
A1	-	GND	Input	I²C slave device address LSB.
XAXB	-	Y1	Input	54.0000 MHz XTAL CX3225SB
OUT0	CLKPLL2F	U5-H6/G5	Output	FPGA bank 2.
OUT1	-	Not connected.	Output	Not used.
OUT2	GBTCLK1	J2-B20/B21	Output	M2C via HPC FMC.
OUT3	-	Not connected.	Output	Not used.
OUT4	-	Not connected.	Output	Not used.
OUT5	-	Not connected.	Output	Not used.
OUT6	-	Not connected.	Output	Not used.
OUT7	GBTCLK0	J2-D4/D5	Output	M2C via HPC FMC.
OUT8	CLK0	J2-H4/H5	Output	M2C via HPC FMC.
OUT9	CLK1	J2-G2/G3	Output	M2C via HPC FMC.

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LED	Color	Connected to	Description and Notes
D1	Green	U5-C2 (bank 1A)	Status LED: ...Depending on FPGA design. With the shiped FPGA design it is on if at least on SFP is connected.

Table 10: On-board LEDsLED.

Power and Power-On Sequence

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