Intel® Stratix® 10 Hard Processor System Technical Reference Manual

ID 683222
Date 11/28/2022
Public

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16.5.3. Controller/DMA/FIFO Buffer Reset Usage

The following list shows the effect of reset on various parts in the SD/MMC controller:
  • Controller reset—resets the controller by setting the controller_reset bit in the ctrl register to 1. Controller reset resets the CIU and state machines, and also resets the BIU‑to‑CIU interface. Because this reset bit is self‑clearing, after issuing the reset, wait until this bit changes to 0.
  • FIFO buffer reset—resets the FIFO buffer by setting the FIFO reset bit (fifo_reset) in the ctrl register to 1. FIFO buffer reset resets the FIFO buffer pointers and counters in the FIFO buffer. Because this reset bit is self‑clearing, after issuing the reset, wait until this bit changes to 0.
  • DMA reset—resets the internal DMA controller logic by setting the DMA reset bit (dma_reset) in the ctrl register to 1, which immediately terminates any DMA transfer in progress. Because this reset bit is self‑clearing, after issuing the reset, wait until this bit changes to 0.
Note: Ensure that the DMA is idle before performing a DMA reset. Otherwise, the L3 interconnect might be left in an indeterminate state.

Intel recommends setting the controller_reset, fifo_reset, and dma_reset bits in the ctrl register to 1 first, and then resetting the rintsts register to 0 using another write, to clear any resultant interrupt.