Avatar HD FPV Goggles V1/ Fat Shark Dominator

Caddx Walksnail Avatar HD fpv goggles are also sold as Fat Shark Dominator HD FSV1125




About The System

These Goggles have been made in partnership with Fat Shark and are sold under both the Fat Shark and Walksnail brand.

They are both compatible with the Walksnail Avatar HD VTX and offer identical functionally.

Internal Images

Images provided by my self and M Bundy.

Important SOC Images Notes

The main chipset used in Avatar HD is Artosyn AR9201/AR8211. This is a similar chipset to the DJI P1 being an CPU and RF base band all in one with Arm cores and Ceva LTE ISP. This chip is not the same as DJI’s though and is believes to be developed separately from the DJI P1 and S1. Both Chipset share a lineage to chipsets from Leadcore such as the LC1860C as used by DJI and others in the past all based of china inhouse designed SOC for use smartphone and tablets based on LTE Ceva ISP’s.

It is also worth noting that DJI has worked with Artosyn in the past on their RF systems and we have suspicions after the fall of Leadcore DJI may have worked with Artosyn to help develop their own SOC. DJI has worked with Artosyn in the early days of Lightbridge and Ocusync development and may have even contributed to the P1 and S1. While there is some possible heritage between the chipsets they are not compatible with each others systems in any way.

Both Chipset share a lineage to chipsets from Leadcore such as the LC1860C

In early samples the main SOC is labelled as a Xilinx Virtex 5 XC5VLX50T – FFG1136FGU2033 – AC4284883A1 2C however this is a obviation attempt.

Based on code samples and SOC package it a Artosyn RF Chipset, the AR9201/AR8211.

AR902 Specification

AR9201 Application Processor Core

 1.5GHz ARM Cortex-A7 quad-core, each core with 32KB I-cache, 32KB D-cache

 512KB L2 cache

 Neon acceleration and double precision FPU

 Embedded Trace data interface (16KB ETB) for ARM-DS5 debugger

 DVFS control: Dynamic voltage and frequency scaling to reduce power consumption

MCU core

 500MHz CPU, 16Kbyte I-cache, 16KB D-cache

 128KB ITCM and 64KB DTCM

 Double precision FPU


 4 x high performance CEVA XM4 Cores at 1000MHz

 2M-Byte shared on-chip SRAM

Video Codec Format

 H.264 BP/MP/HP encoding and decoding

 H.265 MAIN/MAIN10 @L5.0 High-tier encoding and decoding

 MJPEG/JPEG Extended Sequential encoding and decoding

Video Codec Performance

 Software configurable video codec, either as encoder or as decoder

 Real-time multi-stream H.264/H.265 encoding or decoding:

 H.264: [/cdn-cgi/l/email-protection [email protected]]

 [/cdn-cgi/l/email-protection [email protected]][/cdn-cgi/l/email-protection [email protected]]

 MJPEG/JPEG encoding/decoding at [/cdn-cgi/l/email-protection [email protected]]

 MJPEG/JPEG encoding and decoding


 2T4R with 2.5MHz/5MHz/10MHz/20MHz/40MHz bandwidth

 BPSK/QPSK/16QAM/64QAM/256QAM modulation

 LDPC encoder with 1/2, 2/3, 3/4 code rate

 Max down link rate at 100Mbps

 2.4G/5.8G uplink/downlink communication

 One AP support max to four nodes


 One 8-1 10bit SAR ADC

 Two 10bit SAR ADCs

 Four 12bit DACs

 Eight 12bit ADCs


 9 UARTs

 2 Watch dog timers

 20 timers,10 of which have PWM output

 4 CAN bus interface

 5 I2C interfaces, can be configured as either master or slave by software

 4 SPI masters(2×1-1, 2×1-5 ), 2 SPI slave

 4 I2S 4bit interfaces

 147 GPIO, shared with other functions.

 2 AXI DMA controller

 One AHB DMA controller

 USB 3.0 DRD controller and PHY.

 USB 3.0 /Type-C / DisplayPort combo interface

 10 /100/1000M Ethernet RGMII interface

 2-lane PCIe 2.0, can be configured as EP or RC mode

External Memory Interfaces

DDR4/DDR3/LPDDR3 interface

 16/32/64-bit DDR4 interface up to DDR4 2400

 16/32/64-bit DDR3L interface up to DDR3L 2133

 32/64-bit LPDDR3 interface up to LPDDR3 2133

SPI NOR flash interface

 1-/2-/4-wire mode

 3-byte or 4-byte address mode

 Maximum capacity of 256 MB NOR flash or MCP SPI NOR+NAND flash

eMMC 5.1 interface with 64GB max capacity

Secure Boot from internal ROM with eMMC flash or SPI NOR flash.

Physical Specification

Power consumption

 3W typical power consumption in the 4Kx2K scenario

 Multiple power domains for power saving


Operating voltages

 0.9V core voltage

 1.8VI/O voltage

 1.2V/1.2V/1.5V for DDR4/LPDDR3/DDR3(L)

 3.3VI/O voltage



 Body size of 19mm x19mm

 Ball pitch of 0.65mm

Leave a Reply 1

Your email address will not be published. Required fields are marked *

Avatar HD VTX – Mads Tech Wiki

Avatar HD VTX – Mads Tech Wiki

[…] SOC. More information on the SOC and background on the Avatar HD system is at the bottom of this […]