PRELIMINARY
CYW43340
10. Wireless LAN MAC and PHY
10.1 MAC Features
The CYW43340 WLAN media access controller (MAC) supports features specified in the IEEE 802.11 base standard, and amended
by IEEE 802.11n. The salient features are listed below:
■ Transmission and reception of aggregated MPDUs (A-MPDU)
■ Support for power management schemes, including WMM power-save, power-save multi-poll (PSMP) and multiphase PSMP
operation
■ Support for immediate ACK and Block-ACK policies
■ Interframe space timing support, including RIFS
■ Support for RTS/CTS and CTS-to-self frame sequences for protecting frame exchanges
■ Back-off counters in hardware for supporting multiple priorities as specified in the WMM specification
■ Timing synchronization function (TSF), network allocation vector (NAV) maintenance, and target beacon transmission time (TBTT)
generation in hardware
■ Hardware offload for AES-CCMP, legacy WEP ciphers, WAPI, and support for key management
■ Support for coexistence with Bluetooth and other external radios
■ Programmable independent basic service set (IBSS) or infrastructure basic service set functionality
■ Statistics counters for MIB support
10.1.1 MAC Description
The CYW43340 WLAN MAC is designed to support high-throughput operation with low-power consumption. It does so without
compromising the Bluetooth coexistence policies, thereby enabling optimal performance over both networks. In addition, several
power saving modes have been implemented that allow the MAC to consume very little power while maintaining network-wide timing
synchronization. The architecture diagram of the MAC is shown in Figure 24 on page 40.
The following sections provide an overview of the important modules in the MAC.
Document Number: 002-14943 Rev. *L
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