Intel® 500 Series Chipset Family On-Package PCH Datasheet Volume 1

Datasheet

ID Date Version Classification
631119 21/09/2021 00:00:00 Public Content

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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 via 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 muxed native functions, may not operate as expected.