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There is a Silicon Labs I2C programmable clock generator on-board (Si5345A, U2) to generate reference clocks for the module. Programming can be done using I2C via PIN header J1. The I2C bus is also routed to the MAX10 FPGA.

Si5345A Pin
Signal Name / Description
Connected ToDirectionNoteDefault

IN0

Reference input clock.

U1Input25.000000 MHz oscillator, Si8208AI
IN1-Not connected.InputNot used.

IN2

-

Not connected.InputNot used.

IN3

CLK2J2-K4/K5InputHPC FMC configured as C2M clock.

A1

-

GNDInputI2C slave device address LSB.
XAXB-Y1Input54.0000 MHz XTAL CX3225SB

OUT0

CLKPLL2F

U5-H6/G5Output

FPGA bank 2.

25MHz
OUT1-Not connected.OutputNot used.---
OUT2GBTCLK1J2-B20/B21OutputM2C via HPC FMC.125MHz
OUT3-Not connected.OutputNot used.---
OUT4-Not connected.OutputNot used.---
OUT5-Not connected.OutputNot used.---
OUT6

-

Not connected.

Output

Not used.---
OUT7GBTCLK0J2-D4/D5OutputM2C via HPC FMC.156.25MHz
OUT8CLK0J2-H4/H5OutputM2C via HPC FMC.156.25MHz
OUT9CLK1J2-G2/G3OutputM2C via HPC FMC.125MHz

 Table 9: Programmable clock generator inputs and outputs.

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