Data Sheet

17
FORM NO.: FR2-015_ A Responsible Department：WBU Expiry Date: Forever
The information contained herein is the exclusive property of AzureWave and shall not be distributed, reproduced, or disclosed
in whole or in part without prior written permission of AzureWave.
3.4.1 SDIO Host Interface Specification
The AW-CM358SM supports a SDIO device interface that conforms to the industry SDIO Full-Speed
card specification and allows a host controller using the SDIO bus protocol to access the Wireless
SoC device.
The AW-CM358SM acts as the device on the SDIO bus. The host unit can access registers of the
SDIO interface directly and can access shared memory in the frvice through the use of BARs and a
DMA engine.
 Support SDIO 3.0 Standard.
 On-chip memory used for CIS.
 Supports 4-bit SDIO and 1-bit SDIO transfer modes.
 Special interrupt register for information exchange.
SDIO Interface Signals
AW-CM358SM
SDIO Pin Name
Type
Description
SDIO_DATA_CLK
I
SDIO 4-bit mode: Clock
SDIO 1-bit mode: Clock
SDIO_DATA_CMD
I/O
SDIO 4-bit mode: Command line
SDIO 1-bit mode: Command line
SDIO_DATA_3
I/O
SDIO 4-bit mode: Data line Bit[3]
SDIO 1-bit mode: Not used
SDIO_DATA_2
I/O
SDIO 4-bit mode: Data line Bit[2] or Read Wait (optional)
SDIO 1-bit mode: Read Wait (optional)
SDIO_DATA_1
I/O
SDIO 4-bit mode: Data line Bit[1]
SDIO 1-bit mode: Interrupt
SDIO_DATA_0
I/O
SDIO 4-bit mode: Data line Bit[0]
SDIO 1-bit mode: Data line