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©Copyright 2000-2007 SD Card Association
SDIO Simplified Specification Version 2.00
10. SDIO Read Wait Operation
The optional Read Wait (RW) operation is defined only for the SD 1-bit and 4-bit modes. The read Wait
operation allows a host to signal a card that is executing a read multiple (CMD53) operation to temporarily stall
the data transfer while allowing the host to send commands to any function within the SDIO card. To determine
if a card supports the Read Wait protocol, the host shall test SRW capability bit in the Card Capability byte of the
CCCR (see Table 6-1). The timing for Read Wait is based on the Interrupt Period that is defined in section 8.1
If a card does not support the Read Wait protocol, the only means a host has to stall (not abort) data in the
middle of a read multiple command is to control the SDCLK. Read wait support is mandatory for the card to
support suspend/resume.
The rest of this chapter is not included in the Simplified Specification.
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