Intel 600 Series Chipset Family PCH Datasheet, Volume 1 of 2

Datasheet

ID 648364
Date 28/10/2021 00:00:00
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GPIO Buffer Impedance Compensation

All GPIO buffers require impedance compensation for 1.8 V and 3.3 V operation. The impedance compensation is done using the GPP_​RCOMP signal, which requires a precision pull down resistor of 200 Ohm (1 %) to GND. Without proper impedance compensation, the GPIO buffers, including the multiplexed native functions, may not operate as expected.