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
• https://gitlab.raptorengineering.com/raptor-engineering-public/lpc-spi-bridge-fpga/-/blob/master/spi_master.v
• Also Shakti E-Class peripheral set in BSV
• https://github.com/freecores/tiny_spi/blob/master/driver/linux-2.6/oc_tiny_spi.c