Intel® Agilex™ Hard Processor System Technical Reference Manual

ID 683567
Date 11/11/2022
Public

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19.5.6.2. Transmit FIFO Watermark

Therefore, the goal in choosing a watermark level is to minimize the number of transactions per block, while at the same time keeping the probability of an underflow condition to an acceptable level. In practice, this is a function of the ratio of the rate at which the SPI transmits data to the rate at which the DMA can respond to destination burst requests. †