Fan control circuit

Help me please. I can not find this circuit in fpga/nios sources.

Hello @thermit,

LM75 controls the fan itself. NIOS configures it at the startup. LM75 configuration function is here. Function call is here.

Thank you, Zack.
Everything became clear.

manual turn fan ON/OFF

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thx. find the way to control fan manual by limesuitegui