Overview

The Atheros AR9331 is a highly integrated and cost effective IEEE 802.11n 1x1 2.4 GHz System-on-a-Chip (SoC) for wireless local area network (WLAN) AP and router platforms.In a single chip, the AR9331 includes a MIPS 24K processor, five-port IEEE 802.3 Fast Ethernet Switch with MAC/PHY, one USB 2.0 MAC/PHY, and external memory interface for serial Flash, SDRAM, DDR1 or DDR2, I2S/SPDIF-Out audio interface, SLIC VOIP/PCM interface, UART, and GPIOs that can be used for LED controls or other general purpose interface configurations.The AR9331 integrates two Gbit MACs plus a five-port Fast Ethernet switch with a four-traffic class Quality of Service (QoS) engine.The AR9331 integrates an 802.11n 1x1 MAC/BB/radio with internal PA and LNA. It supports 802.11n operations up to 72 Mbps for 20 MHz and 150 Mbps for 40 MHz channel respectively, and IEEE 802.11b/g data rates. Additional features include on-chip one-time programmable (OTP) memory.

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