BECKHOFF EtherCAT IP Core for Xilinx FPGAs v3.00k - Manual (Page 58)

IP Core Configuration
III-46 Slave Controller – IP Core for Xilinx FPGAs
5.1.5.4 SPI Configuration
The SPI interface is a serial slave interface for µControllers.
Figure 21: Register PDI – SPI Configuration
Device emulation
Enable Device emulation (0x0141[0]=1). This feature should be disabled in most use cases.
SPI Mode
The SPI mode determines the SPI timing. Refer to SPI PDI description for details. Mode 3 is
recommended for slave sample code.
Late Sample
The Late Sample configuration determines the SPI timing. Refer to SPI PDI description for details. It is
recommended to leave this unchecked for slave sample code.
Interrupt Configuration
SPI_IRQ output driver configuration.
Polarity of SPI_SEL
SPI_SEL signal polarity.
Tristate driver for SPI_DO inside core
Include tri-state driver for SPI Data Out. With tri-state driver, SPI_DO is either driven actively or high
impedance output.