User's Manual

The data buffering is done inside the chipset BCM43455. The chip uses SDIO as the
data interface of WiFi and serial port as the data interface of Bluetooth. Both SDIO and
serial port IO are well defined by international standard. Such SDIO and serial are all
serial(no parallel ) data interface and they must be buffered to provide bytes data to be
processed by BCM43455’s microcontroller.
The block diagram of the module is as below: