SPI Engine Offload Module

The SPI Engine Offload peripheral allows to store a SPI Engine command and SDO data stream in a RAM or ROM module. The command stream is executed when the trigger signal is asserted. This allows the execution of SPI transactions with a very short delay in reaction to a event.

Files

Name	Description
library/spi_engine/spi_engine_offload/spi_engine_offload.v	Verilog source for the peripheral.
library/spi_engine/spi_engine_offload/spi_engine_offload_ip.tcl	TCL script to generate the Vivado IP-integrator project for the peripheral.

Configuration Parameters

Name	Description
`ASYNC_SPI_CLK`	If set to 1 the `ctrl_clk` and `spi_clk` are assumed to be asynchronous.
`ASYNC_TRIG`	If set to 1, the trigger input is considered asynchronous to the module.
`CMD_MEM_ADDRESS_WIDTH`	Configures the size of the command stream storage. The size is `2**CMD_MEM_ADDR_WIDTH` entries.
`SDO_MEM_ADDRESS_WIDTH`	Configures the size of the SDO data stream storage. The size is `2**SDO_MEM_ADDR_WIDTH` entries.
`DATA_WIDTH`	Data width of the parallel data stream. Will define the transaction’s granularity. Supported values: 8/16/24/32
`NUM_OF_SDI`	Number of multiple SDI lines, (min: 1, max: 8)
`SDO_STREAMING`	Enables the s_axis_sdo interface. This allows for sourcing the SDO data stream from a DMA or other similar sources, useful for DACs.

Signal and Interface Pins

Name	Description
`ctrl_clk`	The `spi_engine_offload_ctrl` signals are synchronous to this clock.
`spi_clk`	The `spi_engine_ctrl` signals, `offload_sdi` signals and trigger are synchronous to this clock.
`spi_resetn`	Synchronous active low reset - Resets the internal state machine of the core.
`trigger`	When asserted the stored command and data stream is send out on the `spi_engine_ctrl` interface.
`spi_engine_offload_ctrl`	SPI Engine Offload Control Interface subordinate. Control interface which allows to re-program the stored command and SDO data stream.
`spi_engine_ctrl`	SPI Engine Control Interface controller. SPI Engine Control stream that contains commands and data.
`offload_sdi`	Streaming AXI controller Output stream of the received SPI data.
`s_axis_sdo`	Streaming AXI peripheral Input stream for SPI data to be sent. Only present when `SDO_STREAMING` parameter is set to 1.