User's Manual

COMPANY CONFIDENTIAL
7
USB 2.0 Device Interface
The USB device interface is compliant with the Universal Serial Bus Specification,
Revision 2.0, April 27, 2000. A USB host uses the USB cable bus and the USB 2.0 device
Interface to communicate with the chip.
The main features of the USB device interface include:
 High/full speed operation (480/12 Mbps)
 Suspend/host resume/device resume (remote wake-up)
 Built-in DMA engine that reduces interrupt loads on the embedded processor and
reduces the system bus bandwidth requirement for serving the USB device operation
 Supports Link Power Management (LPM), corresponding host resume or device resume
(remote wakeup) to exit from L1 sleep state
The USB 2.0 device interface is designed with 3.3V signal level pads.
SDIO Device Interface
The 88W8897 supports a SDIO device interface that conforms to the industry standard
SDIO full-speed card specification and allows a host controller using the SDIO bus protocol
to access the wireless SoC device.
The SDIO device interface main features include:
 Supports SDIO 3.0 standard
 On chip memory used for CIS
 Supports SPI, 1-bit SDIO, and 4-bit SDIO transfer modes at the full clock range of 0 to
208MHz
 Special interrupt register for information exchange
 Allows card to interrupt host
High-Speed UART Interface
The 88W8897 supports a high-speed Universal asynchronous receiver/transmitter interface,
compliant to the industry standard 16650 specification.
The UART interface features include: