AR4100 Datasheet, PDF (9/29 Pages) Freescale Semiconductor, Inc – Low power modes consuming as little as 5 μA of current

AR4100 System in Package 802.11n– General Availability Data Sheet
Features Summary
2.9 802.11n
The AR4100 incorporates the latest generation of 802.11n technology from Qualcomm Atheros.
The AR4100 is 802.11n compliant and features frame aggregation, reduced inter-frame spacing
(RIFS) and half guard intervals for improved throughput and space time block codes (STBC) on
downlink receptions and Low Density Parity Check (LDPC) codes on uplink transmissions for
improved robustness over range. Table 2-1 shows 802.11n (PHY layer) throughput at different
modulations.
Table 2-1 802.11n (PHY layer) Throughput at Different Modulations
MCS
m ₀
1
o ₂
.c ³
4
5
le ⁶
7
Modulation
BPSK
QPSK
QPSK
16-QAM
16-QAM
64-QAM
64-QAM
64-QAM
Data Rate (Mbps)
20 MHz Bandwidth
Full Guard Interval
Half Guard Interval
6.5
7.2
13.0
14.4
19.5
21.7
26.0
29.9
39.0
43.3
52.0
57.8
58.5
65.0
65.0
72.2
a _{The AR4100 features hardware-based AES, AES-CCMP, and TKIP engines for faster data}
c _{encryption, and supports industry leading security features including WPS 2.0, along with}
s _{standard WEP/WPA/WPA2 for personal environments.}
e _{2.10 Host Offloading (WiFi)}
re The AR4100 integrates extensive hardware signal processing and an embedded on-chip CPU to
offload complete 11n MAC/BB/PHY processing to minimize host processor loading.
.f The AR4100 offloads the complete 802.11 b/g/n baseband and MAC functions as a standard
feature, including:
 Link maintenance
w _{ 802.11 frame transmission sequence to initiate the connection with an AP}
 Background scanning, including transmission of probe requests
w_{ Signal quality detection and automated maintenance of current AP list}
 Roaming to a new AP
w_{ Rate adaptation, including automatic retry}
 Encapsulation of 802.3 frames from the host to 802.11 frames
 Decapsulation of the 802.11 frames to 802.3 frames
 Encryption & decryption (hardware ciphers) for WEP/TKIP/AES-CCMP
 IEEE PowerSave; periodic wakeup while in sleep mode to check for buffered traffic
 Security negotiation
 WiFi Protected Setup (WPS) 2.0
MKG-16487 Ver. 5.0
9
Qualcomm Atheros, Inc.
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