# SPI

see also [[QSPI]]

* <http://bugs.libre-soc.org/show_bug.cgi?id=6>
* Optional 4-wire SPI NAND/NOR for boot (XIP - Execute In-place - recommended).
* <https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/>
  includes GPIO, SPI, UART, JTAG, I2C, PinCtrl, UART and PWM.  Also included
  is a Watchdog Timer and others.
* APB to SPI <https://opencores.org/project,apb2spi>
* ASIC-proven <https://opencores.org/project,spi_master_slave>
https://opencores.org/websvn/filedetails?repname=spi_master_slave&path=%2Fspi_master_slave%2Ftrunk%2Frtl%2Fspi_master_slave%2Fspi_master.vhd
* Wishbone-compliant <https://opencores.org/project,simple_spi>
* Raptor Engineering litespi, improved <https://gitlab.raptorengineering.com/kestrel-collaboration/kestrel-litex/litespi>
* Also Shakti E-Class peripheral set in BSV