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GPIO Number

Function

J7 pin 10

SPI host flash programming / mux select

J7 pin 20Active high output for main power switch12

Host power button sensing

J7 pin 14

Host power button control

J7 pin 18

Active high host Host is powered on indication (directly via power LED or through other indication)(POST Complete)

J7 pin 20

Active high host/chassis power switch

J7 pin 22

Host/chassis power good

J7 pin 26

Active low host reset. On negative edge (3.3v to GND) this circuit triggers host system reset via P-channel MOSFET

J7 pin 28

Host reset button sensing

J7 pin 30

BMC_LED0 (BMC booted)

J7 pin 32

BMC_LED1 (BMC identify)

J7 pin 34

BMC_LED2 (Host powered)

J7 pin 36

BMC_LED3 (host ok/fault)

J9 pin 34

Active high host RTC battery disconnect. This signal is active high and when transisions from GND to 3.3v it grounds the RTC power input to the main processor via an N-channel MOSFET. This transistor MUST be connected after the safety 1K ohm between the battery and the RTC power input.Host graceful shutdown

Prototype using HummingBoard

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