BCM89359 Advance Data Sheet
Wireless LAN MAC and PHY
Section 10: Wireless LAN MAC and PHY
IEEE 802.11ac MAC
The BCM89359 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 26.
The following sections provide an overview of the important modules in the MAC.
Figure 26: WLAN MAC Architecture
Embedded CPU Interface
Host Registers, DMA Engines
PMQ
TX/RX FIFO
PMQ
Shared
PSM
Memory
IFS
Backoff, BTCX
IFS
Backoff, BTCX
TSF
TSF
WEP
TKIP,AES,WAPI
WEP
TKIP,AES,WAPI
PSM
Ucode
Memory
SHM BUS
NAV
NAV
IHR BUS
IHR
IHR
TXE
TX A-MPDU
RXE
RX A-MPDU
TXE
TX A-MPDU
RXE
RX A-MPDU
Shared
Memory
PSM
MAC-PHY Interface
The BCM89359 WLAN media access controller (MAC) supports features specified in the IEEE 802.11 base
standard, and amended by IEEE 802.11n. The key MAC features include:
•
•
•
Enhanced MAC for supporting IEEE 802.11ac features.
Transmission and reception of aggregated MPDUs (A-MPDU) for high throughput (HT).
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.
Broadcom®
September 9, 2014 • 89359-DS100-R
Page 64
BROADCOM CONFIDENTIAL
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