BCM43455 Preliminary Data Sheet
Wireless LAN MAC and PHY
Section 11: Wireless LAN MAC and PHY
IEEE 802.11ac MAC
The BCM43455 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 28.
The following sections provide an overview of the important modules in the MAC.
Figure 28: WLAN MAC Architecture
Embedded CPU Interface
Host Registers, DMA Engines
TX-FIFO
(32 KB)
RX-FIFO
(10 KB)
PSM
PMQ
UCODE
Memory
PSM
IFS
Backoff, BTCX
WEP
TKIP, AES, WAPI
TSF
SHM
BUS
IHR
NAV
BUS
Shared Memory
(6 KB)
RXE
TXE
EXT- IHR
RX A-MPDU
TX A-MPDU
MAC-PHY Interface
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 73
BROADCOM CONFIDENTIAL
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