The SOMPWR_EN signal controls the entire power rail of the SOM, with the exception of the FAN header power. When SOMPWR_EN is pulled low and no FAN is connected, the SOM standby current is approximately 0.2µA. This enable signal is managed via a MOSFET switch. Additionally, the RESET_SW_IN signal is pulled high to 1.8V on the OSM module.
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Please find the detailed product information here:
Virtex™ UltraScale+™ System on Module