Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 4/01/2024
Public

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5.10.6.7.4. Data Transfers

The SPI master starts data transfers when all the following conditions are met:

  • The SPI master is enabled
  • There is at least one valid entry in the transmit FIFO buffer
  • A slave device is selected

When actively transferring data, the busy flag (BUSY) in the status register (SR) is set. You must wait until the busy flag is cleared before attempting a new serial transfer.

Note: The BUSY status is not set when the data are written into the transmit FIFO buffer. This bit gets set only when the target slave has been selected and the transfer is underway. After writing data into the transmit FIFO buffer, the shift logic does not begin the serial transfer until a positive edge of the sclk_out signal is present. The delay in waiting for this positive edge depends on the baud rate of the serial transfer. Before polling the BUSY status, you should first poll the Transit FIFO Empty (TFE) status (waiting for 1) or wait for (BAUDR * SPI clock) clock cycles.