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[chromium.org documentation](https://www.chromium.org/for-testers/saft) for
more details.
+* **SHI - SPI Host Interface** {#shi}
+
+ [SPI](#spi) host interface used for communication between the AP and the EC.
+ In this configuration, the AP provides the SPI controller and the EC
+ provides the SPI peripheral. This interface is only used for non-x86 base
+ APs.
+
+ x86-based APs use either the [eSPI](#espi) or [LPC](#lpc) interface.
+
* **SPI - Serial Peripheral Interconnect** {#spi}
A 4-wire synchronous communication bus consisting of the signals CLK