[Atheros Communications, Inc.]

General Description
The Atheros AR9331 is a highly integrated and cost effective IEEE 802.11n 1x1 2.4 GHz Systemon-a-Chip (SoC) for wireless local area network (WLAN) AP and router platforms.

FEATUREs
■ Complete IEEE 802.11n 1x1 AP or router in a
   single chip
■ MIPS 24K processor operating at up to
   400 MHz
■ External 16-bit DDR1, DDR2, or SDRAM
   memory interface
■ SPI NOR Flash memory support
■ No external EEPROM needed
■ 4 LAN ports and 1 WAN port IEEE 802.3 Fast
   Ethernet switch with auto-crossover, auto
   polarity, and auto-negotiation in PHYs
■ Four classes of QoS per port
■ Fully integrated RF front-end including PA
   and LNA
■ Optional external LNA/PA
■ Switched antenna diversity
■ High-speed UART for console support
■ I2S/SPDIF-out audio interface
■ SLIC for VOIP/PCM
■ USB 2.0 host/device mode support
■ GPIO/LED support
■ JTAG-based processor debugging supported
■ 25 MHz or 40 MHz reference clock input
■ Advanced power management with dynamic
   clock switching for ultra-low power modes
■ 148-pin, 12 mm x 12 mm dual-row LPCC
   package