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The Carrier Board's push button S2 is connected to the 'RESIN' signal, the function of the button is to trigger a reset of the mounted SoM by driving the reset-signal 'NRST_IN' to ground.

Gigabit Ethernet PHY

On-board Gigabit Ethernet PHY (U6) is provided with Marvell Alaska 88E1512. The Ethernet PHY RGMII interface is connected to the B2B connector JB3, where they can be accessed by the mounted SoM's PS bank. Reference clock input of the PHY is supplied from the on-board 25.000000 MHz oscillator (U7), the 125MHz output clock signal *CLK125' is connected to the B2B connector pin JB3-32.

SDIO Port Expander

The TE0706 Carrier Board is equipped with a Texas Instruments TXS02612 SDIO Port Expander, which is needed for voltage translation due to different voltage levels of the Micro SD Card and the PS MIO-bank of the Zynq device of the mounted SoM. The Micro SD Card has 3.3V signal voltage level, but the PS MIO-bank on the Xilinx Zynq module has VCCIO of 1.8V.

Power and Power-On Sequence

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