SPI Engine

SPI Engine is a highly flexible and powerful SPI controller framework. It consist out of multiple sub-modules which communicate over well defined interfaces. This allows a high degree of flexibility and re-usability while at the same time staying highly customizable and easily extensible.

The core component of the SPI Engine framework is a lean but powerful fully programmable execution module, which implements the SPI bus control logic. The SPI Engine execution module is controlled by a command stream which is generated by a separate module. Different command stream manager modules are available and can be used depending on the system requirements. For example a software controlled memory mapped command stream offers high flexibility, while a offload core which executes a pre-programmed command stream when triggered by an external event allows for very low latency response times. By using a SPI Engine interconnect it is possible to connect multiple command stream manager modules to a SPI Engine execution module.

Sub-modules

• SPI Engine Execution Module: Main module which processes a SPI engine command stream and implements the SPI bus interface logic.

• AXI SPI Engine Module: Memory mapped software accessible interface to a SPI Engine command stream and/or offload cores.

• SPI Engine Offload Module: Stores a SPI Engine command stream, execution is triggered by an external event.

• SPI Engine Interconnect Module: Connects multiple SPI Engine command streams to a SPI Engine execution module.

Interfaces

• SPI Engine Control Interface: SPI Engine command stream.

• SPI Engine Offload Control Interface: Program the command stream stored in a offload module.

• SPI Bus Interface: Low-level SPI bus interface.

Software

• Linux Driver: Linux driver for the SPI Engine framework.

• SPI Engine Instruction Set Specification: Overview of the SPI Engine Instruction format.

Related IP Cores

This list contains cores that are not part of the core SPI engine framework but make use of its interfaces and are intended to be used together with the SPI engine framework.

• util-sigma-delta-spi: Helper module for interfacing ADCs from the Analog Devices Sigma-Delta family.

Examples

• CN0363: Colorimeter application using the AD7175-2 Sigma-Delta ADC.

• adaq7980-sdz: A 16-bit ADC subsystem with four common signal processing and conditioning blocks.

• ad5766: 16-channel, 16-/12-bit, voltage output Digital-to-Analog Converters (DAC).

• CN0363: The AD7768-1 is a low power, high performance, Σ-Δ analog-to-digital converter (ADC).

• projects/ad40xx_fmc Evaluation Board for the AD4000 Series 16-/18-/20-Bit Precision SAR ADCs.

• AD469x: 16-Bit, 16-Channel, 500 kSPS/1 MSPS, Easy Drive Multiplexed SAR ADC.

• AD4630-24 / AD4030-24 / AD4630-16: 16/24-Bit, 2 MSPS Single or Dual Channel SAR ADC.

Additional Resources

• Presentation: SPI Engine Design Philosophy.

• SPI Engine Pipeline Delays

• SPI Engine Tutorial - PulSAR-ADC.

Software Support

• No-OS project at drivers/axi_core/spi_engine

• No-OS driver at drivers/axi_core/spi_engine/spi_engine.c

• Linux project at drivers/spi

• Linux driver at drivers/spi/spi-axi-spi-engine.c

References

• HDL IP core at library/spi_engine

• SPI Engine on wiki