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Atheros AR9331

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Information[edit]

The Atheros AR9331 (Hornet) is a Wi-Fi System-On-Chip (WiSoC),

typically used in access points and router platforms.

The Atheros AR1311 seems to be a newer revision of the AR9331, having

identical pinout and complete software compatibility.
  • For a list of all currently documented Atheros chipsets with specifications, see Atheros

Known chip revisions:

  • AR9331-AL1A
  • AR9331-AL3A
  • AR1311-????

Specifications[edit]

  • Processor identification: 00019374 (Processor ID: 0x93; Rev: 3.5.0) (See MIPS 24K)
  • CPU: MIPS 24Kc @400 MHz, WiSoC 802.11bgn 1T1R (1x2:1);
  • 802.11n WLAN MAC/BB/Radio,int. RF FE (int./ext. PA/LNA);
Data rate: 20 MHz - 72 Mbit/s, 40 MHz - 150 Mbit/s;
  • RAM: 16-bit DDR1, DDR2, SDRAM; Flash: SPI NOR;
  • 1x USB 2.0 Host/Device; 5x FE ports switch (QoS);
  • JTAG, UART, GPIO, I2S/S-PDIF, SLIC (VoIP/PCM);
  • 148-pin, 12 mm x 12 mm dual-row LPCC, LPCC (dual-row); 25/40 MHz crystal;
  • Operating temperature range: 0 to 110 °C

Block diagram[edit]

AR9331-Block-Diagram.png

Datasheet[edit]

USB[edit]

  • USB 2.0 Host/Device mode support
Seems to be a variant of Chip idea IP core. More information is needed.

MIMO[edit]

Note about antenna diversity and MIMO: strictly according to 802.11n nomenclature, this chip is 1x1:1,

since it has no maximum-ratio-combining (MRC) RX chains. However, the chip has two RX RF chains with
four analog (RF) combining methods, selected dynamically in real-time for each packet during reception,
resulting in performance much closer to MIMO 1x2:1 than MIMO 1x1:1 even though it's not full MIMO-MRC.

In this wiki, when the second RF chain and second RX antenna are both installed, the device is labeled

as 1x2:1, otherwise it's labeled 1x1:1.

JTAG[edit]

  • irlen 5
  • IDCODE: 0x00000001
  • impcode: 0x60414000
  • EJTAG: Version 3.1 Detected
  • EJTAG: features: R4k ASID_8 MIPS16 noDMA MIPS32

Pinouts:[edit]

  • A56 - GPIO12/RESET
  • B48 - GPIO11/JS
  • A54 - GPIO7/TDO
  • B46 - GPIO6/TDI
  • A53 - TCK
  • A52 - GPIO8/TMS

Additional information, pinouts, etc. are here: AR9331 pinout

Images[edit]

See TP-LINK_TL-MR3020#JTAG

Table of Systems[edit]

Atheros AR9331 / AR1311

Devices[edit]

Device Type PHY modes Manuf. CPU1 FLA1 RAM1 WI1 WI2 Switch Ether. Expan. Ports FCC date
Logitech Harmony Ultimate Hub
FCC ID: JNZOR0004
has internal images
WiFi IR bridge bgn
Logitech
CoO: Sample PRC Flag.svg
Atheros
AR9331
16 MiB
16,777,216 B
131,072 Kib
16,384 KiB
128 Mib
0.0156 GiB
32 MiB
33,554,432 B
262,144 Kib
32,768 KiB
256 Mib
0.0313 GiB
Atheros
AR9331
1x1:1, bgn

1 USB
2013-04-03

Software Support[edit]

Barebox[edit]

This information is related to barebox release v2016.10.0.

Component State Comments
Console OK
SPI flash OK cached read support WIP
GPIO OK
Ethernet Controller WIP
USB WIP

Linux Kernel[edit]

This information is related to Linux kernel release 4.8.x.

Component State Comments
Console OK
SPI flash OK cached read support WIP
GPIO OK
Ethernet Controller
USB
WLAN WIP