SPI Engine: SDO data prefetch #1501
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This was referenced Oct 31, 2024
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SDO data can now be clocked in independently from the offload trigger. This allows lower latencies for executing transfers, since the data can be obtained from the DMA before the trigger. It also better separates the command path from the data path. SDO data source behavior is altered: previously, with SDO_STREAMING=1 the SPI Engine would prioritize the SDO memory and switch to AXI Streaming when empty. This unused automatic switching is now removed: if the SPI Engine is built with SDO_STREAMING=1 it will only get SDO data from AXI Streaming, and with SDO_STREAMING=0 it will only use the SDO memory. Signed-off-by: Laez Barbosa <[email protected]>
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changed it so the SDO data source is a parameter (synthesis-time), rebased on main |
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Tested on AD4052, same behavior as in main |
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PR Description
Allows spi_engine_execution get sdo data independently of the instruction command. This reduces the trigger to transfer latency, and opens the door to further pipelining this path or reducing latency even more.
(this PR should be merged after #1499)
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