Intel® Agilex™ Hard Processor System Technical Reference Manual

ID 683567
Date 11/11/2022
Public

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16.5.8.2.1. Signaling a Stall

To signal the stall, perform the following steps:
  1. Check if the card supports the read_wait facility by reading the SDIO card’s SRW bit, bit 2 at offset 0x8 in the CCCR.
  2. If this bit is 1, all functions in the card support the read_wait facility. Use the SD/SDIO IO_RW_DIRECT command to read this bit.
  3. If the card supports the read_wait signal, assert it by setting the read wait bit (read_wait) in the ctrl register to 1.
  4. Reset the read_wait bit to 0 in the ctrl register.