User guide

Redpine Signals, Inc. Proprietary and Confidential. Page 13
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2.2.6 TCP/IP Control frames
If the frames from the Host are interpreted as TCP/IP specific frames then the
WCB interacts with the TCP/IP stack.
2.2.7 Station Management Entity (SME)
The SME is the core layer which manages the Wi-Fi connectivity. The SME
maintains the state machine to detect the activity on the Wi-Fi network and
indicates to the user accordingly. It also performs re-association to the
configured access point in Infrastructure mode. It interacts with the WPA
supplicant if Security is enabled in the Wi-Fi network.
2.2.8 WPA Supplicant
The WPA supplicant is used to initiate the 802.1x/E Access Point authentication if
WPA/WPA2-PSK is used as the security parameter. It also plays a major part in
performing the 4-way handshake to derive the PTK in WPA/WPA2-PSK modes.
2.2.9 Interrupt
The interrupt pin in the module is an output pin, used by SPI based modules in two
conditions:
1.When the module has data in its output buffers, that needs to be sent to
the host through the SPI interface.
2.When the module wakes up from sleep in Power Save Mode 1.
The interrupt is active high and level triggered.