1.. _espi_api:
2
3Enhanced Serial Peripheral Interface (eSPI) Bus
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5
6Overview
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8
9The eSPI (enhanced serial peripheral interface) is a serial bus that is
10based on SPI. It also features a four-wire interface (receive, transmit, clock
11and target select) and three configurations: single IO, dual IO and quad IO.
12
13The technical advancements include lower voltage signal levels (1.8V vs. 3.3V),
14lower pin count, and the frequency is twice as fast (66MHz vs. 33MHz)
15Because of its enhancements, the eSPI is used to replace the LPC
16(lower pin count) interface, SPI, SMBus and sideband signals.
17
18See `eSPI interface specification`_ for additional details.
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20
21API Reference
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23
24.. doxygengroup:: espi_interface
25
26.. _eSPI interface specification:
27    https://downloadmirror.intel.com/27055/327432%20espi_base_specification%20R1-5.pdf
28