SPI Engine Control Interface

The SPI Engine Control Interface is used to exchange data between different cores within the SPI Engine framework. It is used to exchange the commands and synchronization points as well as the SPI bus transmit and receive data.

The interface consists of four streams:

• The CMD stream which carries the SPI Engine commands. (Manager to Subordinate)

• The SDO stream which carries the to be transmitted data for the SPI bus. (Manager to Subordinate)

• The SDI stream which carries the received data from the SPI bus. (Subordinate to Manager)

• The SYNC stream which carries the synchronization events. (Subordinate to Manager)

Each of the streams has a valid, ready and data signal. They follow the handshaking protocol as defined by the AXI standard. Meaning the manager asserts valid when the data on the data signal is valid and the subordinate asserts ready when it is able to accept new data. If both valid and ready are asserted at the same time the data has been transmitted from the manager to the subordinate.

Files

Name	Description
library/spi_engine/interfaces/spi_engine_ctrl_rtl.xml	Interface definition file

Signal Pins

Width	Name	Direction (Manager)	Description
	cmd_ready	Input	Ready signal of the CMD stream
	cmd_valid	Output	Valid signal of the CMD stream
[15:0]	cmd_data	Output	Data signal of the CMD stream
	sdo_ready	Input	Ready signal of the SDO stream
	sdo_valid	Output	Valid signal of the SDO stream
[DATA_WIDTH-1:0]	sdo_data	Output	Data signal of the SDO stream
	sdi_ready	Output	Ready signal of the SDI stream
	sdi_valid	Input	Valid signal of the SDI stream
[(NUM_OF_SDI*DATA_WIDTH-1):0]	sdi_data	Input	Data signal of the SDI stream
	sync_ready	Output	Ready signal of the SYNC stream
	sync_valid	Input	Valid signal of the SYNC stream
[7:0]	sync_data	Input	Data signal of the sync stream