User's Manual

FLC-WFM301 Datasheet
Flaircomm Microelectronics Confidential
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4.6.1.2 Host Sleep and Wake-up
The normal method for WFM301CL to wake the host up is via the in-band interrupt on
SDIO_DATA[1]. This is the dame mechanism that is used to notify the host of received data or
interesting events; no explicit sleep signaling is required.
An alternative out-of-band mechanism is provided for hosts that cannot utilize the SDIO interrupt as
a wake-up signal, e.g. where a separate power-management IC needs to restore power to the host
processor. This feature is enabled by masking out SDIO interrupts via the Int Enable register within
the CCCR in function 0. When an SDIO interrupt would have been signaled otherwise, a pulse is
instead generated on a configured PIO line.
Note: The out-of-band wake-up signal is not a replacement for the in-band SDIO interrupt. The standard interrupt signal
should be used for data transfer during normal operation.