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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VCCSPI Voltage (3.3 V or 1.8 V) Selection

The VCCSPI voltage (3.3 V or 1.8 V) is selected via a Hardware strap on GPP_​H18.

This strap sets the SPI interface signaling voltage at the rising edge of RSMRST#. Designers should strap this pin to match the expected interface operational voltage for their target SPI device as follows.

0 = SPI voltage is 3.3 V (Default, this strap has a 20 kohm ± 30% internal pull-down)

1 = SPI voltage is 1.8 V (4.7 kohm - 10 kohm pull-up to Primary well Power rail)