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GPIO Number | Function |
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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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