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