BCM4319 Preliminary Data Sheet
MAC Features
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Interframe space timing support, including reduced interframe spacing (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
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Hardware offload for AES-CCMP, legacy WPA™ TKIP, legacy WEP ciphers, and support for key
management
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Support for coexistence with Bluetooth® (BT) and other external radios
Programmable independent basic service set (IBSS) or infrastructure basic service set functionality
Statistics counters for management information base (MIB) support
MAC Description
The BCM4319 WLAN MAC is designed to support high throughput operation with low power consumption. 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 14.
The following sections provide an overview of the important MAC modules.
Figure 14: WLAN MAC Architecture
Embedded CPU Interface
Host Registers, DMA Engines
TX-FIFO
32 KB
RX-FIFO
10 KB
PSM
PMQ
PSM
UCODE
Memory
IFS
Backoff, BTCX
WSE
WEP, TKIP, AES
TSF
SHM
BUS
IHR
NAV
BUS
Shared Memory
6 KB
RXE
RX A-MPDU
TXE
TX A-MPDU
EXT- IHR
MAC
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PHY Interface
Broadcom®
April 2, 2014 • 4319-DS05-R
Single-Chip IEEE 802.11™ a/b/g/n MAC/Baseband/Radio
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