Intel® Arria® 10 Hard Processor System Technical Reference Manual

ID 683711
Date 1/10/2023
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

20.5.5.2. Example: Slave Selection Software Flow for SPI Slave

  1. If the SPI slave is enabled, disable it by writing 0 to SSIENR.
  2. Write CTRLR0 to match the required transfer.
  3. Write TXFTLR and RXFTLR to set FIFO buffer threshold levels.
  4. Write IMR register to set interrupt masks.
  5. Write SSIENR register bit 0 to 1 to enable SPI slave.
  6. If the SPI slave transmits data, write data into TX FIFO buffer.
    Note: All other SPI slaves are disabled (SSIENR = 0) and therefore does not respond to an active level on their ss_in_n port.

The FIFO buffer depth (FIFO_DEPTH) for both the RX and TX buffers in the SPI controller is 256 entries.