BCM43907 Preliminary Data Sheet
IEEE 802.11n MAC
Figure 12: 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
WEP
TKIP, AES, WAPI
TSF
SHM
BUS
IHR
NAV
BUS
Shared Memory
6 KB
RXE
RX A-MPDU
TXE
TX A-MPDU
EXT- IHR
MAC-PHY Interface
The BCM43907 WLAN MAC supports features specified in the IEEE 802.11 base standard and amended by
IEEE 802.11n. The key MAC features include:
•
Transmission and reception of aggregated
MPDUs (A-MPDU) for high throughput (HT).
•
Timing synchronization function (TSF), network
allocation vector (NAV) maintenance, and target
beacon transmission time (TBTT) generation in
hardware.
•
Support for power management schemes,
including WMM power-save, power-save multi-
poll (PSMP), and multiphase PSMP operation.
•
Hardware offload for AES-CCMP, legacy WPA
TKIP, legacy WEP ciphers, WAPI, and support for
key management.
•
Support for immediate ACK and Block-ACK
policies.
•
•
Support for coexistence with Bluetooth and other
external radios.
•
•
Interframe space timing support, including RIFS.
Support for RTS/CTS and CTS-to-self frame
sequences for protecting frame exchanges.
Programmable independent basic service set
(IBSS) or infrastructure basic service set
functionality.
•
Back-off counters in hardware for supporting
multiple priorities as specified in the WMM
specification.
•
Statistics counters for MIB support.
Broadcom®
March 12, 2016 • 43907-DS104-R
Page 45
BROADCOM CONFIDENTIAL
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