This version is outdated by a newer approved version.
This version (27 May 2015 14:19) is a draft.
Approvals: 0/1The Previously approved version (26 May 2015 18:55) is available.
This version (27 May 2015 14:19) is a draft.Approvals: 0/1The Previously approved version (26 May 2015 18:55) is available.
This is an old revision of the document!
Table of Contents
SPI Engine Offload FPGA Peripheral
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 |
|---|---|
| spi_engine_offload.v | Verilog source for the peripheral. |
| spi_engine_offload_ip.tcl | TCL script to generate the Vivado IP-integrator project for the peripheral. |
Configuration Parameters
| Name | Description | Default |
|---|---|---|
SPI_CLK_ASYNC | If set to 1 the ctrl_clk and spi_clk are assumed to be asynchronous | 0 |
CMD_MEM_ADDR_WIDTH | Configures the size of the command stream storage. The size is 2**CMD_MEM_ADDR_WIDTH entries. | 4 |
SDO_MEM_ADDR_WIDTH | Configures the size of the SDO data stream storage. The size is 2**SDO_MEM_ADDR_WIDTH entries. | 4 |
Signal and Interface Pins
| Name | Type | Description |
|---|---|---|
ctrl_clk | Clock | The spi_engine_offload_ctrl signals are synchronous to this clock. |
spi_clk | Clock | The spi_engine_ctrl siganls, 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 | Input | 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 slave | Control interface which allows to re-program the stored command and SDO data stream. |
spi_engine_ctrl | SPI Engine Control Interface master | SPI Engine Control stream that contains commands and data. |
offload_sdi | Streaming AXI master | Output stream of the received SPI data |
Theory of Operation
More Information
resources/fpga/peripherals/spi_engine/offload.1432729173.txt.gz · Last modified: 27 May 2015 14:19 by Lars-Peter Clausen